647results about "Sludge detoxification" patented technology

An apparatus for synergistically combining a plasma with a comminution means such as a fluid kinetic energy mill (jet mill), preferably in a single reactor and / or in a single process step is provided by the present invention. Within the apparatus of the invention potential energy is converted into kinetic energy and subsequently into angular momentum by means of wave energy, for comminuting, reacting and separation of feed materials. Methods of use of the apparatus in the practice of various processes are also provided by the present invention.

The invention discloses a resource utilization method of sludge based on thermal hydrolysis-pyrolysis carbonization. The method includes the steps of: (1) transporting dehydrated sludge to a sludge preheater; (2) sending the preheated sludge into a sludge thermal hydrolysis reaction kettle; (3) subjecting the thermal hydrolysis product to solid-liquid separation to obtain thermal hydrolysis filtrate and a solid product; (4) carrying out natural heap drying, crushing, activation and granulation on the solid product successively, then conveying the product to a rotary controllable pyrolysis carbonization furnace by a spiral conveyer, and conducting high-temperature rapid pyrolysis to obtain biochar, tar and high-temperature waste gas, introducing the high-temperature waste gas into the sludge preheater, and subjecting the biochar to resource comprehensive utilization; and (5) subjecting the thermal hydrolysis filtrate to anaerobic fermentation, and using the generated biogas as the fuelof the pyrolysis carbonization furnace. The method provided by the invention overcomes the problems of high energy consumption of the sludge carbonization process and nonstandard resource utilizationmethod of sludge biochar in sewage treatment plants at present, and realizes reduction, stabilization, harmless and resource comprehensive utilization of sludge in sewage treatment plants.

The invention discloses a method for removing heavy metal chromium in bottom mud by using modified nano zero-valent iron. The method comprises the following steps: adding the modified nano zero-valent iron into the bottom mud containing chromium for performing constant-temperature oscillation treatment, so as to complete treatment on the bottom mud containing chromium, wherein the modified nano zero-valent iron is prepared from lauryl sodium sulfate and nano zero-valent iron in an ultrasonic dispersion manner. As lauryl sodium sulfate is adopted to modify nano zero-valent iron, due to the steric-hindrance effect, the nano material is stabilized, the modified nano zero-valent iron is higher in removal rate of the heavy metal chromium, shorter in treatment period, higher in reaction activity, lower in repairing cost, clean and free of pollution, simple and convenient in treatment, and free of toxic or harmful function on the environment.

Methods to control and suppress odor in papermaking sludge are described. One method involves admixing sludge from a papermaking process and cyclodextrin to provide treated sludge with the cyclodextrin present in an effective amount to control odors in the treated sludge. The deodorized sludge may be used as a component of resin-wood composite products, such as composite decking materials, walls, flooring, casting forms, and the like.

The invention discloses an in-situ remediation method for mining area watershed heavy metal pollution bottom sludge.The method includes the following steps that a slope wall is arranged; a bank side riverbed slope is leveled, and a layer of geotextile is laid on the bank side riverbed slope; the mining area watershed heavy metal pollution bottom sludge is obtained to be stirred and mixed with a heavy metal pollution restoration agent, and the mixture is laid on the geotextile and stabilized for a certain period of time to form a restoration bottom sludge layer; plants are planted on the restoration bottom sludge layer.By means of the method, on one hand, the problem of riverway pollution bottom sludge accumulation can be solved, and on the other hand, the problem of bottom sludge heavy metal pollution is effectively solved due to addition of a bottom sludge matrix restoration agent and combined planting of riverway plants.Besides, riverway landscape is attractive, and water quality is continuously and effectively improved.Plant intercropping is beneficial to restoration of bottom sludge polluted by heavy metal and stabilization of the slope, and soil and water loss is prevented.

The invention provides a sludge conditioning agent, an application thereof and a method for conditioning sludge. The sludge conditioning agent comprises a geopolymer and other conditioning additives. On one hand, the addition of the geopolymer remarkably improves a flocculation reaction of the sludge conditioning agent on the colloidal particles in the sludge conditioning process and improves the sludge dewatering effect, and on the other hand, toxic substances such as metal ions can also be surrounded in a cavity between the geopolymer molecules, so that a detoxification effect is achieved; meanwhile, the geopolymer can remarkably reduce the use of ferric chloride, quicklime and the like, so that the cost can be reduced, the corrosion of the ferric chloride on a pipeline in the mechanical dehydration process and the blockage of the quicklime on the pipeline and a filter cloth can be reduced.

The invention relates to a method for simultaneously improving sludge anaerobic digestion efficiency and reducing the ecotoxicity of heavy metals. According to the method, after straws are activated with a ZnCl2 solution, straw biochar is prepared under a 550 DEG C high-temperature anaerobic condition, and further modification is performed by using an HCl solution and microwave; and by using modified biochar as carrier, a zero-valent nano-iron loaded modified biochar composite material HCl-FBC is prepared through a chemical reaction. According to the present invention, by adding the modified biochar composite HCl-FBC to the anaerobic digestion reactor at the initial stage of sludge anaerobic digestion, the organic matter conversion rate of sludge can be significantly increased, and the cumulative gas production of methane can be increased; HCl-FBC can easily increase the microbial diversity and the activity of the digested sludge and change the microbial community structure; and with the method, the sludge anaerobic digestion efficiency can be significant increased, the biogas production can be increased, the biological toxicity of the heavy metal in the digested sludge is effectively reduced, and the great significance is provided in the resource utilization of sludge and the reduction of the risk of sludge land use.

Cost-effective processes and tools used therein are described that decontaminate sludge using remedial water in a closed and environmentally friendly system. Typical contaminants such as toxic metals, microorganisms, and toxic compounds are detoxified or destroyed by one or more remedial water treatments to sludge that is confined to the closed system. The closed system may comprise a covered rail road car, ISO container, or other large space into which the remedial water, and optionally, remedial gas, is applied by injection or other means. In a preferred embodiment, water is electrochemically activated at the site of use and injected through an array of pipes within the container. A large variety of other waters and combinations of water, and even air treatments are particularly useful in combination with the closed system for treating sludge. Sludges such as dredged material, human or animal waste, and soils or sediments, are particularly amenable to conversion by the materials and methods of the invention into a more beneficial end use product.

The invention relates to an emulsion-type water-based cleaning agent for oily sludge and a preparation method and an application method thereof. The emulsion-type water-based cleaning agent comprises the following components by mass: 2-10 parts of a surfactant, 3-10 parts of an oil soluble component and balance of a water phase. The preparation method is that the surfactant, the oil soluble component and the water phase are stirred and mixed evenly at room temperature to obtain the uniform and stable emulsion-type water-based cleaning agent. When in use, the oily sludge is first mixed with the emulsion-type water-based cleaning agent, and stirred at certain temperature, after the cleaning is completed, oil, water and solid three phase separation is performed on the mixture, and finally the solid phase is washed with hot water of the same temperature for one time. The emulsion-type water-based cleaning agent for the oily sludge has high safety and high efficiency, the preparation method is simple, and the treatment effect of the oily sludge is satisfactory.

The invention discloses an efficient and safe treatment device for environmentally friendly sludge, which includes a feeding port, a treatment box, a rotating shaft, an ultraviolet sterilizing lamp, a camera, a fan, an electrode, an impeller, a filter plate, a heater, a guide wheel, a drain pipe, and an inclined filter screen and a medicament adding pipe, the top of the treatment box is provided with a feeding port, an inclined filter is installed in the feeding port, a rotating shaft is arranged in the processing box, an impeller is installed on the rotating shaft, the rotating shaft is connected with an external motor, and a fan is arranged on the inner wall of the top of the processing box to handle There are ventilation holes on the box, chemical adding pipes on the treatment box, ultraviolet sterilizing lamps on the inner wall of the treatment box, electrodes in the treatment box, filter plates at the bottom of the treatment box, and heaters under the filter plates. A drainpipe is provided at the bottom of the treatment box. The invention guarantees working efficiency, separates heavy metal ions therein, ensures water conservancy and environmental protection, has simple structure, is convenient to use, and is beneficial to popularization.

The invention discloses a fast and high-efficiency sludge dewatering device, which comprises a shell, the bottom of the shell is symmetrically arranged with supporting feet, and a screen is arranged inside the shell, and the screen is in the shape of an arc groove. A turntable is set at the center of the arc, and the turntable is set on a rotating shaft in the casing. A rotating rod is arranged symmetrically on the center of the turntable, and a scraper is arranged at the end of the rotating rod. The top end of the right side of the screen is fixed on the casing. On the right side wall of the body, the left end of the screen is fixed to the inner bottom of the housing through a vertical rod; the top of the right side of the housing is provided with a feed port, and the housing on the left side of the screen is provided with an upper extrusion roller and a lower extrusion roller; The lower squeeze roller includes an outer drum, and the outer drum is a filter mesh drum; the invention skillfully arranges the screen structure and the scraping mechanism on the screen, which greatly improves the sludge dewatering efficiency, and at the same time, an upper squeeze roller is arranged corresponding to the bottom of the screen. The pressure roller and the lower squeeze roller, and clever use of the material hanging mechanism to scrape in the preliminary dewatered sludge to achieve further dehydration.

The invention relates to a preparation method of a sludge biocharcoal water permeable brick with high adsorption performance, which can effectively solve the problems of the conventional building brick produced by sludge that the sludge content of the single brick is low, the sludge utilization rate is low, and the strength of the brick produced independently by sludge or sludge biochaircoal is insufficient. According to a technical scheme, the preparation method comprises the following steps: after dewatered sludge is rinsed to remove partial heavy metal, the dewatered sludge is press filtered by virtue of a plate frame, then coal ash or blast furnace slag is added and uniformly mixed, after being granulated and dried, the mixture is pyrolysed at a high temperature to obtain the sludge biocharcoal, crushed stone aggregates are mixed with processed waste fabric, the stirred concrete and the biocharcoal are loaded into a mold together and then pressurized, molded, demolded and maintained, thus obtaining the sludge biocharchaol water permeable brick. The biochaircoal water permeable brick prepared by the method of the invention can prevent heavy metal nitrogen, phosphorus, organic pollutants and the like in direct surface runoff from being migrated into underground water and from polluting the underground water, and the method is an innovation for synergistic treatment and recycling of waste.

The invention discloses an urban domestic sludge treatment process.The process includes the following steps of 1 preparation of dewatered sludge, wherein sludge which is concentrated and dewatered by an urban sewage treatment plant is adopted; 2, conditioning of sludge, the dewatered sludge is conveyed to a slurry regulating pool, a chemical conditioning agent is added, and the mixture is stirred and mixed to be uniform through a stirrer in the regulating pool; 3, slurry radiation treatment, wherein slurry obtained after chemical conditioning is conveyed to a radiation workshop through a conveyor belt for radiation treatment; 4, slurry low-temperature pyrohydrolysis; slurry obtained after radiation treatment is beaten into a reaction kettle through a slurry conveying pump, a reaction kettle keeps closed in the work period, after slurry enters the reaction kettle, the temperature is raised continuously in the continuous stirring process, when the temperature is raised to 85-95 DEG C, timing is started, and the temperature is maintained at 90 + / -5 DEG C for 30-35 minutes; 5, slurry obtained after low-temperature pyrohydrolysis can be directly dewatered through a membrane filter press, the moisture content is lowered to 60% or below, the number of fecal coliform groups is smaller than or equal to 100 / g (mL), the slurry obtained after low-temperature pyrohydrolysis can also be combined with anaerobic digestion which has been developed and matured for stabilizing treatment, and methane gas utilization is achieved.

A continuous flow granular / flocculent sludge wastewater process selects for granule biomass capable of nitrogen and phosphorus removal and controls granule size and concentration of granular and flocculent sludge for optimal nutrient, organic, and solids removal in a smaller footprint. It includes anaerobic, anoxic, and aerobic process zones, a high soluble biodegradable COD loaded first reactor in anaerobic or anoxic zones, a granular sludge classifier with recycle of underflow granular sludge to the first reactor, a secondary clarifier to settle flocculent sludge and particulates and recycle of flocculent sludge from the secondary clarifier underflow to an aerobic process zone. Wasting of sludge from the two separate recycle lines controls the bioprocess flocculent and granular sludge concentrations and SRTs. Bypass around and recycle flow to the classifier to maintain desired flow under various influent flow conditions aid control of granule size. On / off mixer operation of anaerobic and anoxic reactors may be used.

The invention relates to a sludge treatment process. The process comprises the steps as follows: a river is dredged by a dredging device and sludge is conveyed by a sludge pipeline; the sludge is sentto a garbage sorting machine for garbage sorting; the sludge is sent to a sand scraping separation system to remove sand in the sludge; the sludge is sent to a first-stage sedimentation tank of a sludge storage tank, a second-stage sedimentation tank and a third-stage sedimentation tank are arranged behind the sludge storage tank, and overflow water in the third-stage sedimentation tank is conveyed to a clear water tank; a dosing platform blends required chemicals and adds agents to sludge output by the sludge storage tank, output sludge is mixed, conditioned and then conveyed into a concentration tank to increase sludge concentration, then, secondary dosing is performed before dewatering, the sludge is sent to a dewatering platform for dewatering, and filter pressing water produced by the dewatering platform flows back to the second-stage sedimentation tank; overflow water in the third-stage sedimentation tank is discharged to the clear water tank, water in the clear water tank is recycled or directly discharged to the river. A relatively efficient water recycling system is adopted and dependence on clean water is reduced.

A system for removing selenium from a solid feed stream includes a selenium dissolver configured to selectively dissolve elemental selenium from the solid feed stream and to produce a selenium rich solution and a crystallizer coupled to the selenium dissolver and configured to receive the selenium rich solution from the dissolver, to add an acid to the selenium rich solution, to remove purified selenium from the selenium rich solution, and to remove sulfur dioxide from the selenium rich solution.

The invention provides an efficient blue algae salvaging ship for improving salvaging and treatment efficiency of the blue algae salvaging ship. The efficient blue algae salvaging ship mainly comprises a ship body, a water decanter, a water pump, a filtration pipeline, a chemical feeding tank, an algae-mud dehydrating machine, a rear drainage pipe and a side drainage pipe. Algae-laden water on thesurface layer in a nose direction is collected into an algae water bin by the water decanter, is pressurized by virtue of the water pump, the pressurized algae-laden water enters the filtration pipeline to be dehydrated and then is conveyed into the chemical feeding tank and the algae-mud dehydrating machine, produced algae cake is loaded into an algae cake bin, tail water discharged by the filtration pipeline and the algae-mud dehydrating machine is discharged out from the stern direction by virtue of the rear drainage pipe and the side drainage pipe. The filtration pipeline is regularly back-washed by lifting the water decanter, switching a valve and utilizing the tail water of the algae-mud dehydrating machine. After blue algae salvaging is finished, water in the algae water bin, a pipeline bin and the chemical feeding tank is discharged outside the ship body by virtue of the water pump and a backwashing pipe, and the algae cake is transported to a shore to be treated. By implementing the efficient blue algae salvaging ship provided by the invention, a significant role is played for controlling blue algal bloom, water bloom and red tide, improving lake water quality, removing phosphorus and nitrogen in water and alleviating water eutrophication.

The invention relates to a hybrid biological and chemical method for decontaminating sludge containing heavy metals and pathogenic microorganisms, consisting of the following steps: the sludge is mixed with an acidic leaching solution in order to acidify the sludge with a pH which is low enough to solubilize the majority of the heavy metals and to destroy most of the pathogenic microorganisms but which is also high enough to minimize the solubilization of fertilizing elements; oxidation-reduction of more than +400 mv is maintained, liquid-solid separation occurs in order to obtain a solid fraction comprising decontaminated acidic sludge and a liquid fraction comprising heavy metals which are dissolved in a leaching solution; the sludge is neutralized: and neturalized decontaminated sludge is recovered, whereby the fertilizing elements contained therein, i.e. carbon, nitrogen and phosphorus, remain substantially unchanged in relation to the initially contaminated sludge.

The invention discloses a high-efficiency, safe and environmentally friendly treatment equipment for sludge, which includes a feeding port, a treatment box, a rotating shaft, a UV violet lamp, a camera, a fan, an electrode, an impeller, a filter plate, a heater, a guide wheel, a drain pipe, a runner and sedimentation The top of the treatment box is provided with a feeding port, the outlet of the feeding port is provided with a pulverizer, the processing box is provided with a rotating shaft, an impeller is installed on the rotating shaft, a fan is provided on the inner wall of the top of the processing box, and a UV purple light is also provided on the inner wall of the processing box. There are electrodes in the treatment box, a filter plate at the bottom of the treatment box, a heater under the filter plate, a drainage pipe at the bottom of the treatment box, and the drainage pipe is set under the filter plate, and the drainage pipe is connected with the sedimentation tank. The side wall of the box is provided with runners. The invention sterilizes the bacteria and viruses in the sludge, reduces its diffusion, reduces the damage to people and the environment, separates the heavy metal ions in it, and prevents them from polluting other soil sources during landfill or other treatments. It has a simple structure and is easy to use. Good for promotion.

The invention discloses a treatment method of heavy metals in sludge, relates to the technical field of environmental protection and chemical engineering, and in particular relates to the technical field of treatment of sludge heavy metal through filter pressing of urban domestic sewage. The treatment method of the heavy metals in sludge is characterized by comprising the following steps: hydrolyzing proteins in the sludge through a function of a modifying agent; deaminizing amino acid and fixing amino; performing reaction on ammonium chloride generated by fixation and the added calcium hydroxide and glucose powder step by step to reduce sludge heavy metal ion valence or to be directly reduced into elementary substances; reducing heavy metal ions which are not completely reduced under a reduction function of surplus fixed carbon after the heating of the sludge in a subsequent distillation process. The invention discloses a sludge innocent treatment method; resources contained in the sludge are fully utilized, and a practical and feasible new method is provided for sludge treatment.

The invention discloses an animal manure innocent treatment and biogas fermentation technology. The technology comprises the steps of: mixing prepared animal manure and prepared fermenting auxiliaries according to the mixing ratio that addition amount of the fermenting auxiliaries are 25-35 percent of total amount of animal manure; inoculating the prepared EM bacteria into the mixture according to the inoculation quantity, regulating the water content of manure to be between 60-68 percent, dosing into a biogas digester to perform biogas anaerobic fermentation, and keeping the temperature of biogas fermentation to be between 20 and 40; constructing a stirring device on the biogas digester, and turning once every 5-7 days. When the biogas yield in the biogas digester is sharply decreased, the situation indicates that the animal manure is sufficiently decomposed and fermented. The technology has the characteristics of simple process and low cost, and can establish an 'animal-biogas manure-crops' innocent ecological environment, so that the breeding environment is purified, and the crop yield is increased.

The invention discloses a treatment method for sludge in a municipal sewage treatment plant and belongs to the technical field of sludge treatment. The technical scheme adopted by the treatment method is as follows: the treatment method is characterized in that sludge in the municipal sewage treatment plant is subjected to harmless processing and treatment through the processing steps of dehydration, modification and heavy metal treatment, and treated sludge conforms to the national pollutant control standard of agricultural sludge. Compared with the prior art, the treatment method is novel, reliable and free of secondary pollution, changes waste into valuable, realizes harmless treatment of sludge, realizes the outstanding substantial characteristic of resourceful treatment and makes remarkable progress.

The invention discloses sewage treatment equipment with a secondary pollution preventing function. The sewage treatment equipment comprises a box body, wherein a power box is fixedly connected with the top of the box body, the bottom of the power box inside the box body is fixedly connected with a thrust unit, and the power box drives the thrust unit to move left and right; the lower part of the left side of the box body is fixedly connected with a motor box, the bottom of the inner wall of the box body is fixedly connected with a disinfection box, and the motor box provides stirring power for the disinfection box; the right side of the inner wall of the box body is fixedly connected with a collection box, a filter screen is fixedly connected between the left side of the inner wall of the box body and the left side of the collection box, and the thrust unit pushes impurities on the filter screen into the collection box. The sewage treatment equipment with the secondary pollution preventing function has the advantages that sewage is effectively filtered and disinfected, the sewage is prevented from being discharged and polluting the environment, thorough treatment on the sewage can be guaranteed, practicability is strong, and cost is saved.

The invention discloses a river and lake sludge harmless treatment system. The system comprises a sludge carting component, a filtering component for separating impurities from sludge, an integrated screening component for separating powder particles from sludge, a sedimentation component for precipitating bottom mud from sludge, a solid-liquid separator for bottom mud dehydration, a crushing device for crushing clinker after dehydration, a drying device for drying the crushed clinker and a carbonation device for converting the dried clinker into carbonized sludge. The river and lake sludge harmless treatment system is easy to operate, needs short sludge treatment time and has a small occupied land area.

The invention discloses a method for removing antibiotic resistance genes through ionizing irradiation. Antibiotic mushroom dregs are treated with an ionizing irradiation technology (including gamma-rays and high-power electron beams generated by an electronic accelerator) to damage DNA of microbial cells, so that the resistance genes are effectively removed, and residual antibiotics can be decomposed simultaneously. The method is efficient and wide in application range; radiation can be performed at the normal temperature, no chemical reagents or only a few chemical reagents are required to be added, and no secondary pollution can be caused. The method can be applied to removal of the resistance genes in the antibiotic mushroom dregs, can be applied to removal of the resistance genes in water, soil and sludge and has wide application prospects in the environmental field.

A process for treating sewage sludge with percent solids less than 20 percent comprises (1) contacting sewage sludge that contains undesirable microorganisms with at least one compound that produces methyl isothiocyanate in water to form a reaction mixture, (2) mixing the reaction mixture, and (3) maintaining the reaction mixture in a closed vessel for at least about two hours. After the reaction mixture is maintained in a closed vessel for the desired time, the closed vessel can be vented to the atmosphere for a time sufficient to dissipate residual methyl isothiocyanate from the reaction mixture.

The invention mainly discloses a sludge treating machine applied to an ecological river and a treating method of the sludge treating machine. The treating machine comprises a pulverizing bin, a treating bin, a water drainage bin, a drying bin and a storage bin, wherein a feeding hopper is arranged above the pulverizing bin; a pulverizing mechanism is arranged in the pulverizing bin; the treating bin comprises a chemical treating bin and a microbial treating bin; a filter pressing device is arranged in the water drainage bin; the water drainage bin is connected with the drying bin through a material guiding plate; a conveying mechanism and a heating mechanism are arranged in the drying bin; and a discharging opening of the conveying mechanism is connected with the storage bin. The treating method comprises the following steps: sludge digging, pulverizing treatment, chemical treatment, microbial treatment, water drainage treatment, drying treatment and storage. The method is simple and effective, convenient to operate, environmentally friendly, and high in treatment efficiency, the quality of the sludge is improved effectively, toxic and harmful substances in the sludge are reduced, meanwhile, water in the sludge is reduced, storage and conveyance of the sludge are facilitated, and purposes of changing harmful substances into beneficial substances, recycling materials and protecting the environment achieved.

The invention discloses an in-situ restoration method for polluted bottom sludge of a black and odorous water body based on pelelith. The in-situ restoration method for the polluted bottom sludge of the black and odorous water body based on the pelelith comprises the following steps of S1, soaking the pelelith into activated sludge to perform microorganism loading and film hanging, wherein the microorganism loading and film hanging period is greater than or equal to 15 days; S2, feeding the pelelith after microorganism loading and film hanging into the bottom sludge of the black and odorous water body to perform in-situ restoration, wherein the feeding amount is 0.1 to 2kg / cm<2>; S3, aerating above the bottom sludge of the black and odorous water body, wherein the concentration of dissolved oxygen in the water body is greater than or equal to 2mg / L. The in-situ restoration method has the advantages that after the natural peletith is subject to the microorganism loading and film hanging, the ammonia nitrogen in the bottom sludge of the black and odorous water body can be well removed, the deposited bottom sludge of the black and odorous water body can be treated, the generation of odorous substances is inhibited, and the water body and the bottom sludge are free from obvious smelly odor; the used materials are natural and are easy to obtain, the cost is low, the operation is simple, the stability is good, the application range is broad, the secondary pollution is avoided, and the like.