34results about How to "Solve the problem of low removal rate" patented technology

The invention discloses a VOCs (volatile organic chemicals) low-temperature plasma combined treatment system. The VOCs low-temperature plasma combined treatment system comprises a pretreatment device, a negative ion purifier, a double-medium plasma processor, a high-energy ion processor and a composite catalytic unit, wherein sealed air chambers are arranged in the pretreatment device, the negative ion purifier, the double-medium plasma processor, the high-energy ion processor and the composite catalytic unit respectively; the air chamber of the pretreatment device is sequentially communicated with the air chambers of the negative ion purifier, the double-medium plasma processor, the high-energy ion processor and the composite catalytic unit; the air chamber of the pretreatment device is also communicated with a gas inlet of industrial waste gas VOCs, and the air chamber of the composite catalytic unit is connected with an induced draft fan and is communicated with an exhaust funnel. The VOCs low-temperature plasma combined treatment system can solve the problems the single treatment mode of VOCs in the existing enterprises has low removal rate and can cause secondary pollution.

The invention discloses a preparation method of a cationic polymer. The structural formula of the cationic polymer is disclosed as Formula I. The method comprises the following steps: (1) reacting 3-butenyl-1-ol with sodium hydroxide to obtain 3-butenyl-1-sodium alkoxide; and (2) reacting hexamethyl proguanil with the 3-butenyl-1-sodium alkoxide to obtain a cationic monomer tri(dimethylamino)methyl-3-butenylether hydrochloride disclosed as Formula II; and (3) in the presence of an emulsifier and an initiator, carrying out reversed-phase emulsion polymerization on acrylamide and the tri(dimethylamino)methyl-3-butenylether hydrochloride to obtain the cationic polymer disclosed as Formula I. The cationic polymer prepared by the method can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The invention discloses a VOCs waste gas treatment system which comprises a water curtain spray tower, an atomization spray tower, a gas-liquid separator, a plasma generation device and an infrared heating device which are sequentially connected and communicated. The highest removal rate of the VOCs waste gas can reach 90% or above, the problem that an existing waste gas treatment technology cannot meet the continuously-improved emission standard requirement is solved, and emission pollution of the VOCs waste gas to the environment is eliminated; the whole treatment process is simple and easyto operate, high in treatment efficiency, less in required equipment and low in equipment energy consumption, the requirements of modern enterprises for energy conservation, emission reduction and production benefit improvement are well met, and the method has great significance in saving resources and reducing cost.

The invention discloses a direct reduction method and a system of zinc leaching slag. The direct reduction method comprises the steps of drying the zinc leaching slag, so as to obtain dry zinc leaching slag; crushing the dry zinc leaching slag, so as to obtain zinc leaching slag particles; mixing the zinc leaching slag particles with additives and reduction coal, and forming, so as to obtain pellet materials; performing direct reduction on the pellet materials in a direct reduction rotary hearth furnace, so as to obtain smoke which contains zinc, lead, silver and indium and metallized pellets. According to the method, by using preparation and forming processes, the problem of easiness in melting of the pellets is solved, the direct reduction temperature is effectively increased, and the volatilization of zinc, lead, silver and indium is promoted.

The invention discloses a tri(dimethylamino)methyl-3-butenylether hydrochloride. The structural formula is disclosed as Formula I. The cationic functional monomer is prepared by the following steps: (1) reacting tetramethylurea with oxalyl chloride to obtain dimethylamino-N,N-dimethylchloromethyleneiminium chloride; (2) reacting dimethyl amine with the dimethylamino-N,N-dimethylchloromethyleneiminium chloride to obtain hexamethyl proguanil; (3) reacting 3-butenyl-1-ol with sodium hydroxide to obtain 3-butenyl-1-sodium alkoxide; and (4) reacting the hexamethyl proguanil and the 3-butenyl-1-sodium alkoxide to obtain the tri(dimethylamino)methyl-3-butenylether hydrochloride. The multi-claw cationic functional monomer can be used for preparing a cationic polymer; and the cationic polymer can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The invention belongs to the technical field of sewage treatment, and particularly relates to a device for improving, transforming and intensifying phosphorus removal of rural domestic sewage by using iron shavings. The device comprises an iron shavings filler reaction functional area, the iron shavings filler reaction functional area is provided with a plurality of functional units which are independent from one another and are arranged along a straight line, every two adjacent functional units communicate with each other, each functional unit is filled with iron shaving filler, the iron shaving filler in one functional unit located at one end of the iron shaving filler reaction functional area is connected with a water inlet pipe, the other end of the iron shaving filler reaction functional area is provided with a sludge collection area, the sludge collection area is sunken in the bottom of the iron shaving filler reaction functional area, an aeration system is further arranged in the iron shaving filler reaction functional area and connected with each iron shaving filler, and a water outlet is formed in the side wall of the iron shaving filler reaction functional area. According to the invention, the construction cost is greatly reduced, and great demonstration significance is brought to improvement and reconstruction of agricultural pollution.

The invention relates to a process for cleaning alkali liquor in a spray scrubber tower to effectively remove sulfur trioxide (SO3). An alkali liquor cleaning device is arranged in a spray scrubber tower, and comprises an upper cleaning hole plate and a lower layer cleaning hole plate, the upper and the lower layer cleaning hole plates are obliquely arranged, one end of the upper and the lower layer cleaning hole plates is connected through a steering device, shunting devices are respectively arranged on the other ends of the upper and the lower layer cleaning hole plates, the shutting device on the lower layer is communicated with an alkali liquor tank, the alkali liquor tank is communicated on to the shunting device on the upper layer through a pump to form an alkali liquor circulation loop, the inner portions of the cleaning hole plates are hollow, through holes are arranged on the upper and the lower sides of the cleaning hole plates, exhaust gas removing sulfur dioxide (SO2) goes through the through holes of the cleaning hole plates, and passes through two layers of flowing alkali liquors layers, and the SO3 in the exhaust gas is fully contacted with alkali liquor and reacts with the alkali liquor, thereby removing the SO3. The process for cleaning the alkali liquor in the spray scrubber tower to effectively remove the SO3 aims to achieve low cost and input and high efficiency, simply remoulds a desulfurizing tower in a wet flue gas desulphurization technology, keeps high removal efficiency of the SO2, and improves removal efficiency of the SO3 at the same time.

The invention belongs to the technical field of wastewater treatment, and in particular relates to a high-efficiency nitrogen and phosphorus removal process for domestic sewage with a low carbon-nitrogen ratio. The process mainly comprises the following steps: S1, pretreating the sewage, and respectively introducing the pretreated sewage into an anaerobic MBR reaction tank and an aerobic MBR reaction tank; S2, respectively introducing the sewage treated by the anaerobic MBR reaction tank into an anaerobic ammonia oxidation reaction tank and an aerobic MBR tank; S3, discharging the sludge generated by the anaerobic MBR reaction tank and the aerobic MBR reaction tank to a sludge digestion tank, wherein part of the sludge treated by the sludge digestion tank flows back into the anaerobic MBRtank through a return pipeline, and the other part flows back into the aerobic MBR tank; and S4, discharging the treated sewage after separating by a sedimentation tank. The treatment method can effectively degrade nitrogen and phosphorus in the domestic sewage with the low carbon-nitrogen ratio, and no additional carbon source is needed.

The invention discloses an application of a polymer as a flocculating agent. The structural formula of the polymer is shown in the formula I in the specification, wherein in the formula I, m is a natural number from 2888 to 4129 when being the number-average degree of polymerization; n is a natural number from 7684 to 27280 when being the number-average degree of polymerization; m is a natural number from 4393 to 6397 when being the weight-average degree of polymerization; n is a natural number from 11686 to 44601 when being the weight-average degree of polymerization; the flocculating agent is used for removing oil in oily sewage. In the application, the cationic polymer has the characteristics of good water solubility, convenience in use and the like, and is especially suitable for solving the problem of low removal rates of emulsified oil and suspended solids in the oily sewage produced in heavy oil fields. Besides, the flocculating agent also has the advantages of small dross production and low content of moisture and high content of oil in dross.

The invention discloses a preparation method of tri(dimethylamino)methyl-3-butenylether hydrochloride. The structural formula of the cationic functional monomer is disclosed as Formula I. The method comprises the following steps: (1) reacting 3-butenyl-1-ol with sodium hydroxide to obtain 3-butenyl-1-sodium alkoxide; and (2) reacting hexamethyl proguanil with the 3-butenyl-1-sodium alkoxide to obtain the tri(dimethylamino)methyl-3-butenylether hydrochloride. The multi-claw cationic functional monomer prepared by the preparation method can be used for preparing a cationic polymer; and the cationic polymer can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The invention discloses a method for recycling high-salt organic wastewater, which belongs to the technical field of environmental protection. It includes the steps of oxidation with hydrogen peroxide, which sequentially includes the first stage of adding hydrogen peroxide under neutral conditions, the second stage of heating and stirring reaction under strong acid conditions and adding peroxide under weak acid conditions again. The third stage of hydrogen. The invention effectively solves the problem of low removal rate of COD in high-contained organic wastewater and improves the oxidation of organic matter in high-salt organic wastewater by adjusting the pH in stages according to the reaction process and adding hydrogen peroxide in the process of hydrogen peroxide oxidation efficiency.

The invention discloses a coking wastewater comprehensive treatment method comprising the following steps of: pre-treatment, biochemical treatment and deep treatment. The deep treatment step comprises sequential steps of filtering, ultra-filtering, carrying out resin adsorption, re-filtering, and carrying out reverse osmosis. With the adoption of a coking wastewater comprehensive treatment system of the coking wastewater comprehensive treatment method, the pre-treatment step adopts a de-oiling pond, an adjusting pond and an air floating pond, which are connected in sequence; the biochemical treatment step adopts a primary aeration pond, a primary settling pond, an oxygen-poor pond, an aerobic pond and a secondary settling pond, which are connected in sequence; and the deep treatment step adopts a multi-medium filter, an ultra-filtering device, a resin adsorption column and a reverse osmosis device. The coking wastewater comprehensive treatment method has the beneficial effects that the method is stable to operate and has a simple process and good treating effects.

The invention discloses a method of low-temperature and low-pressure countercurrently leaching tellurium from copper anode mud. In the invention, according to the solubility of tellurium in a sulfuric acid system, under a low temperature and low pressure condition, the copper anode mud, after water washing, is processed through the processes of performing countercurrent leaching process to controlled-leaching the tellurium, feeding a secondary leaching solution to the primary leaching step, and recycling the copper and tellurium from the primary leaching solution, and ending the process. The method can significantly improves the effect of removing copper and tellurium from the copper anode mud during a pre-treatment process before material feeding in a Kaldo furnace smelting process. On the basis of ensuring copper removal rate, leaching of the tellurium is enhanced, so that the method is more than 99% in copper removal rate and is 70-85% in tellurium removal rate. The method reduces circulating accumulation of the tellurium in the system, reduces or avoids influences of the tellurium on subsequent noble metal recovery, and increases economic benefit of enterprises through centralized treatment.

The invention provides an eluting agent for repairing Cu, Pb, As combined contaminated soil and a using method thereof. Main compositions of the eluting agent are Twain-80, anionic surfactant and EDTA, wherein the anionic surfactant is one of SDS, SDBS and lauric acid, and volume ratio of the EDTA, the Twain-80 and the anionic surfactant is 1:2:2. The using method comprises the following steps that (1) contaminated soil is screened with water after mixed with the water, sundries and the soil with larger particles are removed; (2) the screened soil is delivered to an eluting pool to be stirredfor 10-12 h and precipitated for 2-4 h, eluting liquid is collected to a recovery system for recycling; (3) the soil after eluted is detected until the detection result is qualified; and (4) the qualified soil after processing is dehydrated and then refilling is carried out. The anionic surfactant and chelating agent are adopted to jointly process the Cu, Pb, As combined contaminated soil, removalrate of Cu, Pb, As in the soil can be improved, and specific effects of the repairing of the Cu, Pb, As combined contaminated soil can be achieved.

The invention discloses a cationic polymer. The structural formula is disclosed as Formula I, wherein m is a natural number ranging from 2888 to 4129 when being number-average polymerization degree, and n is a natural number ranging from 7684 to 27280 when being number-average polymerization degree; and m is a natural number ranging from 4393 to 6397 when being weight-average polymerization degree, and n is a natural number ranging from 11686 to 44601 when being weight-average polymerization degree. The cationic polymer can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The present invention discloses a denim sewage treatment and pretreatment method, and relates to textile technology, organically comprising the following steps: 1, introducing wastewater subjected to pretreatment such as physical sedimentation into a tower biological filter for treatment; 2, performing laser scanning treatment on the sewage for one time; 3, performing ultrasonic treatment on the sewage for one time; and 4, performing ultraviolet irradiation on the sewage for one time; the height of the tower biological filter is reduced greatly; a blast apparatus such as a blast blower is not needed; energy consumption and initial investment are reduced; the main flows of the process treatment are physical treatment flows, the sludge amount is reduced greatly, and the secondary pollution is prevented; and the investment is reduced and the production process is convenient to operate and manage.