48results about How to "Full flocculation" patented technology

The invention relates to the wastewater multistage processing field, and particularly relates to a purifying device for wet-process flue gas desulfurization wastewater and a using method thereof. The purifying device for the wet-process flue gas desulfurization wastewater includes a wastewater regulation tank (1), and is characterized by also including a reaction flocculation tank (2), a precipitation tank (3), a first-stage fluorine removal reaction tank (41), a second-stage fluorine removal reaction tank (42) and the like. The using method of the purifying device for the wet-process flue gas desulfurization wastewater is characterized by successively comprising the following steps: a, adjusting the water quality and the water amount; b, carrying out Cr6<+> reduction and heavy metal ion reaction flocculation; c, carrying out first-stage precipitation; d, carrying out a fluorine removal reaction and COD degradation; e, carrying out second-stage precipitation; f, carrying out a neutralization reaction; g, carrying out sand filter processing; and h, draining water. The system operation is stable and reliable, the energy consumption is low, and the operation cost is low.

The invention relates to a small high-efficiency mud-water separation device used for supplying water to villages and small towns. The device comprises a mechanical flocculation area and a hydraulic flocculation area, a sedimentation area, an active mud residue concentration area, an active mud residue internal reflux tube / cylinder, an impeller lifting device, a water inlet and outlet system, a mud discharge system and the like. The main body of the device mainly comprises three layers of concentric cylinders; an inner cylinder is the mechanical flocculation area, the middle is provided with the impeller lifting device, and active mud residue at the bottom of a concentration chamber is lifted to the mechanical flocculation area by the internal reflux tube / cylinder arranged in the center of the bottom; the hydraulic flocculation area is formed between the inner cylinder and a middle cylinder, and is provided with a pore plate; the sedimentation area is formed between the middle cylinder and an outer cylinder, and is provided with a single-blade single-curve rotary sloping plate; and the bottom of the equipment is provided with a mud residue concentration chamber. The device has theadvantages of compact structure, high space utilization rate, small occupied area, mechanical flocculation area, easily controlled reflux quantity, low energy consumption, good effluent quality and the like, and has great promotion value.

The invention creatively relates to a sewage treatment system and a sewage treatment method. According to the adopted technical scheme, the sewage treatment system is composed of a flocculation tank and a sedimentation tank. According to the flocculation tank, a sewage inlet and a reaction water outlet are formed in a tank body I, and three baffle plates I are arranged in the tank body I to sequentially divide the interior of the tank body I into a cavity I, a cavity II, a cavity III and a cavity IV. According to the sedimentation tank, a reaction water inlet is formed in a tank body II, and three baffle plates II are arranged in the tank body II to divide the interior of the tank body II into a baffling area and a sedimentation area; a polyacrylamide inlet is formed in the baffling area, a sludge hopper is arranged at the lower end of the sedimentation area, a sludge discharging pipe is arranged at the lower end of the sludge hopper, a water distribution plate with a great number of water distribution holes is mounted at the upper end of the sludge hopper, a plurality of inclined plates are mounted on the water distribution plate, and a water drainage outlet is formed in the tank body II. According to the sewage treatment system and the sewage treatment method, the principle of sedimentation and air floatation is adopted, the efficiency of solid-liquid separation is improved to the greatest extent, and the final quality of drained water which is treated is guaranteed.

The invention provides a lead-zinc smelting wastewater treatment method, which comprises the following steps: A, initial treatment of inflow; B, primary flocculation with an iron-based flocculating agent; C, secondary flocculation with polyacrylamide; D, filtration; E, adsorption with activated carbon; F, PH value regulation; G, membrane treatment: pumping water in a second regulation tank into a micro-filtration membrane device in a water pump pressurization form, pumping clear liquid filtered by the micro-filtration membrane device into a nanofiltration membrane device in the water pump pressurization form, pumping clear liquid filtered by the nanofiltration membrane device into a reverse osmosis device in the water pump pressurization form, and discharging or recycling clear liquid obtained by reverse osmosis of the reverse osmosis device after the clear liquid is detected to be qualified. According to the method, the iron-based flocculating agent and the polyacrylamide are adopted for performing flocculation twice, so that complete flocculation precipitation can be ensured; a filtration method combining micro-filtration, nanofiltration and reverse osmosis is adopted to deeply remove heavy metal ions such as lead and zinc ions in wastewater layer by layer, so that good removal effects are achieved.

The invention discloses a treatment method for high-concentration suspended matter waste water. The treatment method comprises the following steps that 1, a multi-stage hydrocyclone is utilized for separating the waste water containing high-concentration suspended matter to obtain deposition and overflow liquid, and the deposition is recovered; 2, deposited slurry is concentrated, wherein the overflow liquid obtained in the step 1 is guided into a radial-flow sedimentation tank, a flocculating agent is introduced into an accessory adding pipe of the overflow liquid and the radial-flow sedimentation tank in a multi-point adding mode to obtain the deposited slurry and supernatant water, and the supernatant water is recovered; 3, the deposited slurry is dehydrated, wherein the deposited slurry obtained in the step 2 is subjected to filter pressing and drum film secondary extruding dehydrating, meanwhile, air entering and flow penetrating are carried out, and filter residues in a whole filter chamber are purged in a full-flow and high-pressure mode. The invention further discloses a device for using the treatment method for the high-concentration suspended matter waste water. Solid and liquid can be separated fast, the deposited slurry is dehydrated fast, the high-concentration suspended matter waste water can meet the standard or can be recovered for production, the water content of mud cakes is low, and the requirement for clean transportation is met.

The invention relates to a treatment system used for printing and dyeing sewage physic-chemical treatment. The sewage treatment system comprises technological process equipment, a sampling detection device and a control cabinet, a water inlet segment is connected with a water outlet pipeline through a waste water pump, and the sampling detection device is connected with printing and dyeing sewage in the water outlet pipeline through a sampling tap; the outlet end of a sampling water inlet pipe is connected with a detection box which comprises a box body, a sludge-water separator and a transmittance detector used for detecting the transmittance of the printing and dyeing sewage, and both the mud-water separator and the transmittance detector are arranged in the box body. By the aid of high-pressure gasification sewage mixture, flocculent precipitate and air flotation froth are respectively separated through the sludge-water separator to obtain detection water, the detection water is then detected through transmittance, transmittance detection is quite stable and accurate, scale and dirty formation is avoided, stability and accuracy in control of the sewage are improved, and good control effect is achieved.

The invention provides a micro-dynamic in-situ collection and separation integrated device for surface water algae and nutritive salt. The device comprises a solar cell panel and a floating platform connected with the solar cell panel, wherein a surface algae-laden water collection unit, an algae-laden water flocculation reaction unit, a standby flocculant feeding unit, an algae-laden water flowing control unit, an alga and nutritive salt separation unit, a clean algae-laden water discharging unit and a floating platform power driving unit are carried on the floating platform. According to the device, high-density surface algae-laden water does not need to be pumped to a shore for treatment, addition of a flocculant chemical and microbial carriers for removal of nitrogen and phosphorus are not required, mechanical concentration of the algae-laden water is not required, the removal effect of algae and nutritive salt such as nitrogen, phosphorus and the like is good, little power is consumed, the operation cost is low, maintenance is simple and no chemical pollution or solid waste is produced.

The invention relates to a treatment device for the physical and chemical treatment of printing and dyeing wastewater. The treatment device for treating the printing and dyeing wastewater comprises a water feeding pipe segment, a decolorizer adding device, a coagulant aid adding agent, a sewage pump, a water conveying pipeline, a sampling detection device for detecting a wastewater treatment index, control boxes and a sedimentation basin, wherein the water feeding pipe segment is connected with the water conveying pipeline through the sewage pump; the tail end of the water conveying pipeline is connected with the sedimentation basin; the front part of the water conveying pipeline is connected with a reaction pipe; the water conveying pipeline at the rear side of the reaction pipe is provided with a sampling opening; the sampling detection device is connected with the printing and dyeing wastewater in the water conveying pipeline through the sampling opening; the sampling detection device is used for acquiring signals through an optical sensing element and inputting the signals into the control boxes; the control boxes are in signal connection and are used for controlling the adding amount of a decolorizer in the decolorizer adding device. According to the treatment device, the sampling detection is adopted and amplified to the whole system, so that the control system is controlled well; the whole process ensures that the printing and dyeing wastewater is stably and fully flocculated.

The invention relates to a treatment control system for physicochemical treatment of printing and dyeing sewage. The sewage treatment control system comprises a water inlet pipe section, a decolorizer adding device, a coagulant aid adding device, a sewage pump, a water supply pipeline, a sampling detection device for detecting sewage treatment indexes, a control box and a sedimentation tank, wherein the sampling detection device comprises a sampling water inlet pipe, a buffer filter for removing impurities in the printing and dyeing sewage and a detecting box for detecting the light transmittance of the printing and dyeing sewage; the detecting box comprises a box body, as well as a sedimentation device and a light transmittance detector which are connected with the sampling water inlet pipe in sequence, and the light transmittance detector is used for detecting the light transmittance of a supernate of the printing and dyeing sewage; the sedimentation device and the light transmittance detector are both arranged in the box body; the light transmittance detector comprises a casing, a light source, a light-sensitive receiver, and a multi-way flowing passage for a water sample to flow. The sampling detection is adopted and amplified to the whole system, so that not only can the system be better controlled, but also flocculation of the printing and dyeing sewage can be stable and full in the whole technological process.

The invention discloses an industrial sewage treatment device, in particular to a uniquely-developed compact, high-efficient and movable sewage treatment device by using a hydrocyclone aeration decontaminatorHAD (Hydrocyclone Aeration Decontaminator). The device comprises connecting water pipes, and comprises a sewage equalization pond, an administration mixing device, a U-shaped flocculation size mixing tube, the hydrocyclone aeration decontaminator and a static scalping tank which are orderly connected in series according to the water flow direction through the connecting water pipes. The device can be applied to the treatment of industrial sewage, in particular to the treatment of sewage for medium-small industries. Moreover, the invention also discloses a method for treating the industrial sewage.

The invention provides a pretreatment technology of electrodialysis alkali recovery during viscose fiber production. The pretreatment technology is characterized by comprising the steps that pressed liquor with the content of NaOH of 50-200g / L is subjected to large-particle substance removal by an electric flocculation method, and then enters a microporous filter by a pump; a filtrate is pumped in a membrane module and conveyed to a diffusion dialysis membrane stack; and dilute alkali liquor is obtained and used for subsequent electrodialysis treatment. According to the characteristic that high-concentration waste alkali containing hemicellulose is generated during a viscose fiber pressing course, the waste alkali is pretreated to allow an index of waste alkali liquor to be suitable for a subsequent electrodialysis alkali recovery technology, so that the viscidity of the waste liquor is reduced; energy consumption is reduced effectively; and the penetration efficiency and the operation stability are improved.

The invention discloses a treatment device for purifying beneficiation sewage through an efficient neutral flocculant. The treatment device comprises a stirring tank and a precipitation tank which are mutually communicated; the stirring tank is divided into a primary stirring tank and a secondary stirring tank; the precipitation tank is divided into a primary precipitation tank and a secondary precipitation tank; the primary stirring tank, the primary precipitation tank, the secondary stirring tank and the secondary precipitation tank are sequentially communicated; a sewage inlet pipe is communicated with the primary stirring tank through a water feeding tank, and a chemical feeder is arranged above the water feeding tank; a purified water outlet is arranged in the secondary precipitation tank, and a sewage discharging device provided with a blockage clearing device is arranged at the bottom of the secondary precipitation tank; the secondary stirring tank is separated from the secondary precipitation tank through a circular truncated cone, a cylinder and a conical cylinder; the space defined by the inner wall of the circular truncated cone and the inner wall of the lower part of the conical cylinder is the secondary stirring tank, and the space defined by the inner wall of the cylinder, the outer wall of the circular truncated cone and the upper part of the conical cylinder is the secondary precipitation tank. The structure is more compact, the treatment quality and efficiency are higher, and the reliability is higher.

The invention relates to a treating device for dyeing sewage physicochemical treatment. The sewage treating device comprises a technology process device, a sampling detecting device and a control box. A water inlet pipe section is connected with a water feeding pipe through a sewage pump; the sampling detecting device is connected with dyeing sewage in the water feeding pipe through a sampling opening, and comprises a sampling water inlet pipe, a high-pressure gas inlet pipe and a detecting box for detecting the transparency of dyeing sewage; the outlet end of the sampling water inlet pipe is connected with the detecting box, the detecting box comprises a box body, a muddy water separator and a transparency detector for detecting the transparency of the dyeing sewage, and the muddy water separator and the transparency detector are both arranged in the box body. According to the system, high-pressure gas and sewage are mixed, flocculent precipitation and gas flotation foam are separated through the muddy water separator respectively to obtain detection water, the detection water is detected through the transparency, transparency detecting is quite stable and accurate, scaling cannot be generated, and fouling can also not be generated, the control stability and the accuracy of sewage are improved, and the control effect is good.

The invention discloses a wool scouring wastewater treatment method. The method comprises the following steps: wool fat recycle and treatment; pH adjustment treatment, air flotation treatment, anaerobic biochemical treatment, aerobiotic biochemical treatment, hydrolysis acidification pool treatment, and entering of discharged water to a three-stage A / O (anoxic / oxic) pool; sludge treatment; discharging of sludge in a one-stage air flotation pool, a two-stage air flotation pool, the hydrolysis acidification pool and the A / O pool into a sludge concentration pool to perform concentration, flowingback of the liquid supernatant of the sludge concentration pool to an adjustment pool, dehydration of the sludge after concentration, and outward transport of mud cakes for disposition. The method provided by the invention can be used for effectively removing high-concentration organic matter in wool scouring wastewater.

The invention discloses a seaweed liquid urea synergist flocculation device, which is provided with a seaweed synergist fermentation liquid inlet pipe, a shower head, a tank body, a flocculation agent inlet pipe, a flocculation agent branch pipe, an emptying pipe and a discharging pipe, wherein the seaweed synergist fermentation liquid inlet pipe is welded in a hole formed in the top center of the tank body; the lower end of the seaweed synergist fermentation liquid inlet pipe is connected with the shower head; the discharging pipe is welded in a hole formed in the bottom center of the tank body; the flocculation agent inlet pipe is welded in a hole formed in the right side of the middle part of the tank body; the flocculation agent inlet pipe passes through the outer wall of the tank body to be connected with the flocculation agent branch pipe; the emptying pipe is welded in a hole formed in the right side of the top of the tank body; the flocculation agent branch pipe is of a structure formed by four vertically arranged stainless steel pipes with uniformly distributed spray heads. Seaweed liquid urea synergist fermentation liquid is sprayed out from the shower head to form a fine mist shape to form a downward flow to realize countercurrent contact with the upward fine-mist-shaped fermentation agent sprayed out from the flocculation agent branch pipe; the mixing is sufficient; the flocculation speed is accelerated; the flocculation effect is improved; the power consumption is reduced; the goals of full fermentation liquid flocculation and low energy consumption are realized.

The invention relates to a preprocessing method for black liquor in diffusion dialysis recycling pulp manufacture, and belongs to the technical field of pulp manufacture. The preprocessing method comprises the following steps: adding flocculant into the black liquor, which contains sodium hydroxide with the concentration of 8-30 g / L, for flocculation, and keeping the concentration of the flocculant at 5-10 mg / L; filtering through a sheet frame filter with the bore diameter of 1,100-1,300 g / m<2>; then filtering through a millipore filtration membrane with the bore diameter of 0.1-1 micrometer to reduce the concentration of large particle impurity; recycling lignin to obtain the preprocessing liquid used for diffusion dialysis treating for a cation exchange membrane. Through adopting specific preprocessing method to process the black liquor before entering the diffusion dialysis process, the preprocessing method can increase the recovery rate of alkali and hemicelluloses in the black liquor, reduce damage to the diffusion dialysis membrane system caused by the alkali liquid, prevent blockage of the diffusion dialysis membrane, prolong the service life of the membrane, and guarantee the smooth progress of diffusion dialysis and follow-up handling.

The invention provides a liquefaction device for preparing starch sugar. The liquefaction device for preparing starch sugar comprises a liquefaction column, a material inlet tube connected with a material inlet of the liquefaction column, and a discharge tube connected with a discharge opening of the liquefaction column, wherein the material inlet is formed in the lower part of the liquefaction column, a material outlet is formed in the top of the liquefaction column, and the discharge opening is formed in the bottom of the liquefaction column. The bottom of the liquefaction device provided by the invention is of a conical structure, the direction of the material inlet tube is the direction of a tangent line of the material inlet, and starch liquefaction solution enters the liquefaction device and is uniformly and rotatably fed, thus proteins in starch are adequately flocculated and removed. The invention further provides a liquefaction method for preparing starch sugar. According to the liquefaction method provided by the invention, a hydrolysis temperature is increased and hydrolysis time is shortened; meanwhile, the liquefaction device is used for liquefaction to achieve the purpose of adequately flocculating proteins, thus proteins can be removed better in the filter procedure and further the quality of the starch sugar product is improved.

The invention relates to a preprocessing technology for black liquor in diffusion dialysis recycling pulp manufacture, and belongs to the technical field of pulp manufacture. The preprocessing method comprises the following steps: adding flocculant into the black liquor, which contains sodium hydroxide with the concentration of 8-30 g / L, for flocculation, and keeping the concentration of the flocculant at 5-10 mg / L; filtering through a sheet frame filter with the bore diameter of 1,100-1,300 g / m<2>; then filtering through an ultrafiltration membrane with the bore diameter of 20-1,000 angstroms to reduce the concentration of large particle impurity; recycling lignin to obtain the preprocessing liquid used for diffusion dialysis treating for a cation exchange membrane. Through adopting specific preprocessing method to process the black liquor before entering the diffusion dialysis process, the preprocessing method can increase the recovery rate of alkali and hemicelluloses in the black liquor, reduce damage to the diffusion dialysis membrane system caused by the alkali liquid, prevent blockage of the diffusion dialysis membrane, prolong the service life of the membrane, and guarantee the smooth progress of diffusion dialysis and follow-up handling.

The invention relates to the technical field of car washing, and particularly relates to a car washing device. The car washing device comprises a sewage collecting pipe, and also comprises a flocculating agent box and a container for mixing, wherein the flocculating agent box is provided with a feeding opening and a discharging pipe; the discharging pipe comprises a fixed pipe and a telescopic pipe; the sewage collecting pipe comprises an unloading pipe and a draining pipe; the unloading pipe is communicated with the draining pipe which is used for pouring sewage into the container for mixingintermittently; a hinging hole is formed in the pipe wall of the unloading pipe; the container for mixing is positioned in the unloading pipe, and is fixedly provided with a swinging rod; a rotary shaft is fixed on the hole wall of the hinging hole; the swinging rod is rotatably connected with the rotary shaft; a pushing rod is fixed between the swinging rod and the telescopic pipe; a tension spring is arranged between the swinging rod and the hole wall of the hinging hole; a plugging block is also fixed on the pipe wall of the unloading pipe; a flocculating-agent channel is arranged on the swinging rod. The car washing device has the beneficial effects that the problem of failure to treat the sewage in car washing in the prior art can be solved; meanwhile, full flocculation of the sewagealso can be guaranteed in sewage treatment.

The invention relates to a preprocessing technology for black liquor in diffusion dialysis recycling pulp manufacture, and belongs to the technical field of pulp manufacture. The preprocessing method comprises the following steps: adding flocculant into the black liquor, which contains sodium hydroxide with the concentration of 8-30 g / L, for flocculation, and keeping the concentration of the flocculant at 5-10 mg / L; filtering through a sheet frame filter with the bore diameter of 1,100-1,300 g / m<2>; then filtering through an ultrafiltration membrane with the bore diameter of 20-1,000 angstroms to reduce the concentration of large particle impurity; recycling lignin to obtain the preprocessing liquid used for diffusion dialysis treating for a cation exchange membrane. Through adopting specific preprocessing method to process the black liquor before entering the diffusion dialysis process, the preprocessing method can increase the recovery rate of alkali and hemicelluloses in the black liquor, reduce damage to the diffusion dialysis membrane system caused by the alkali liquid, prevent blockage of the diffusion dialysis membrane, prolong the service life of the membrane, and guarantee the smooth progress of diffusion dialysis and follow-up handling.

The invention discloses a pre-treatment process for recycling lack liquor electrodialysis alkaline in pulp preparation. The pre-treatment process is characterized by comprising the following steps of: recycling lignin from digested black liquor with sodium hydroxide concentration of 8g / L-30g / L through a flocculation method; taking supernatant liquor to block pollutants with large molecular weight by a plate frame filter; and entering the pollutants into a membrane assembly by a pump for conveying to a diffusion dialysis membrane stack to obtain diluted alkali liquor for subsequent electroosmosis treatment. The pre-treatment process can be used for pre-treating the black liquor according to the characteristics including high chromaticity, high basicity, high salt content and high COD (Chemical Oxygen Demand) load of hemicellulose which is generated in a digesting process of viscose, so that the indexes of the pre-treated black liquor are suitable for the subsequent electroosmosis recycling process, and therefore, the purposes of high alkaline recovery rate, low energy consumption and stable operation can be achieved.

The invention provides a pre-treatment technology of ultrafiltration for electrodialytic alkali recovery of black liquor in pulp manufacturing, which is characterized in that digestion black liquor with sodium hydroxide of the concentration of 8-30 g / L is subjected to a flocculation method for removing large-grained materials firstly, and then ultrafiltration for recycling lignose and stopping high molecular weight pollutants, so as to obtain permeate liquor with NaOH used for subsequent electrodialytic treatment. According to the properties of high chromaticness, high basicity, high saltness, and high COD load of hemicellulose produced by viscose in the digesting process, the black liquor is subjected to pre-treatment firstly, so as to allow indexes of the pre-treated black liquor to be suitable for the subsequent electrodialytic alkali recovery technology, and therefore, the purposes of high alkali recovery, low energy consumption and stable operation can be achieved.

The invention provides a chemical phosphorus removal automatic control device and a control method implemented by the same. The chemical phosphorus removal automatic control device comprises a tank, achemical dosing system, a stirring system, a chemical feeding system, a chemical and water mixing system, a water pipe winding system and a control system. The chemical dosing system, the stirring system, the chemical feeding system, the chemical and water mixing system and the water pipe winding system comprise chemical dosing tanks, stirring barrels, chemical feeding tanks, mixers and hoses which are sequentially connected with one another, and devices can be operated under the intelligent control of the control system. The control method implemented by the chemical phosphorus removal automatic control device includes filling the chemical dosing tanks with chemicals; feeding the chemicals and water into the stirring barrels according to preset chemical additive volumes and stirring thechemicals and the water; feeding chemical solution into the chemical dosing tanks; operating the devices, allowing sewage to flow through the mixers, feeding the chemical solution into the mixers according to preset chemical solution additive volumes and carrying out reaction; precipitating discharged water and separating flocculate from the water. The chemical phosphorus removal automatic controldevice and the control method have the advantages that accessories of the chemical phosphorus removal automatic control device are concentrated, the chemical phosphorus removal automatic control device is small in occupied area, the chemicals can be added under the automatic control, the additive volumes are stable, and the cost can be reduced.

The invention relates to the technical field of car washing, and particularly relates to a car washing device. The car washing device comprises a sewage collecting pipe, and also comprises a flocculating agent box and a container for mixing, wherein the flocculating agent box is provided with a feeding opening and a discharging pipe; the discharging pipe comprises a fixed pipe and a telescopic pipe; the sewage collecting pipe comprises an unloading pipe and a draining pipe; the unloading pipe is communicated with the draining pipe which is used for pouring sewage into the container for mixingintermittently; a hinging hole is formed in the pipe wall of the unloading pipe; the container for mixing is positioned in the unloading pipe, and is fixedly provided with a swinging rod; a rotary shaft is fixed on the hole wall of the hinging hole; the swinging rod is rotatably connected with the rotary shaft; a pushing rod is fixed between the swinging rod and the telescopic pipe; a tension spring is arranged between the swinging rod and the hole wall of the hinging hole; a plugging block is also fixed on the pipe wall of the unloading pipe; a flocculating-agent channel is arranged on the swinging rod. The car washing device has the beneficial effects that the problem of failure to treat the sewage in car washing in the prior art can be solved; meanwhile, full flocculation of the sewagealso can be guaranteed in sewage treatment.

The invention provides a pretreatment technology of electrodialysis alkali recovery during viscose fiber production. The pretreatment technology is characterized by comprising the steps that pressed liquor with the content of NaOH of 50-200g / L is subjected to large-particle substance removal by an electric flocculation method, and then enters a microporous filter by a pump; a filtrate is pumped in a membrane module and conveyed to a diffusion dialysis membrane stack; and dilute alkali liquor is obtained and used for subsequent electrodialysis treatment. According to the characteristic that high-concentration waste alkali containing hemicellulose is generated during a viscose fiber pressing course, the waste alkali is pretreated to allow an index of waste alkali liquor to be suitable for a subsequent electrodialysis alkali recovery technology, so that the viscidity of the waste liquor is reduced; energy consumption is reduced effectively; and the penetration efficiency and the operation stability are improved.

The invention provides diffusion dialysis pretreatment technology of black liquor electrodialysis alkali recovery in pulp manufacturing. The diffusion dialysis pretreatment technology is characterized in that: large-particle matters of a boiling black liquor with the concentration of sodium hydroxide being 8-30 g / L are removed through use of an electric flocculation method, then the black liquor enters a membrane module through a pump and is conveyed to a diffusion dialysis membrane stack, and a diluted alkaline liquor is obtained for subsequent electrodialysis processing. During a steaming and boiling process, the viscose fiber can produce characteristics of high hemicellulose chroma, high alkalinity, high salt content, and high COD load, according to the produced characteristics, the pretreatment of the black liquor is carried out to make the pretreated black liquor to be suitable for the subsequent electrodialysis alkali recovery process, so that the purposes of high alkali recovery rate, low energy consumption and stable operation can be achieved.

The invention relates to a small high-efficiency mud-water separation device used for supplying water to villages and small towns. The device comprises a mechanical flocculation area and a hydraulic flocculation area, a sedimentation area, an active mud residue concentration area, an active mud residue internal reflux tube / cylinder, an impeller lifting device, a water inlet and outlet system, a mud discharge system and the like. The main body of the device mainly comprises three layers of concentric cylinders; an inner cylinder is the mechanical flocculation area, the middle is provided with the impeller lifting device, and active mud residue at the bottom of a concentration chamber is lifted to the mechanical flocculation area by the internal reflux tube / cylinder arranged in the center of the bottom; the hydraulic flocculation area is formed between the inner cylinder and a middle cylinder, and is provided with a pore plate; the sedimentation area is formed between the middle cylinder and an outer cylinder, and is provided with a single-blade single-curve rotary sloping plate; and the bottom of the equipment is provided with a mud residue concentration chamber. The device has theadvantages of compact structure, high space utilization rate, small occupied area, mechanical flocculation area, easily controlled reflux quantity, low energy consumption, good effluent quality and the like, and has great promotion value.