31results about How to "Reduce solid waste generation" patented technology

The invention belongs to the field of industrial waste water treatment, and relates to a waste emulsion demulsification processing method. The method employs at least one of bentonite, diatomite and activated clay as an adsorbent, employs at least one of polymeric aluminium, polymerization ferric chloride, polyferric sulfate and polyacrylamide as a flocculating agent, and performs demulsification processing on waste emulsion, wherein grease adsorption is carried out by an adsorbent, flocculation settlement is carried out by a flocculating agent, and solid-liquid separation is carried out. The method has the advantages of simple process, low operation cost, low energy consumption and high processing efficiency. the used agent has the advantages of nontoxicity and innocuousness, low cost and easy acquisition, has obvious maneuverability, and can be widely used for processing the waste emulsion, waste cutting fluid and waste saponification liquor for metal product, machining and other industries. According to the invention, more than 90% of chemical oxygen demand (COD) in the waste emulsion can be removed by a one step, and favorable condition can be provided for subsequent deep treatment such as chemical oxidation and biodegradation.

The invention discloses a sodium chloride-containing pesticide production wastewater resource treatment system and method, and belongs to the field of a sewage treatment method. The system comprises asalt-tolerant bacterium biochemical system, a nanofiltration membrane device, an electrodialysis device and an electrocatalytic oxidation device, wherein the salt-tolerant bacterium biochemical system comprises a first salt-tolerant bacterium aerobic device, a salt-tolerant bacterium anaerobic device and a second salt-tolerant bacterium aerobic device; the second salt-tolerant bacterium aerobic device comprises a salt-tolerant bacterium MBR device; the treatment system also comprises a reverse osmosis device. The invention also discloses a wastewater treatment method. The flow process of themethod of the salt-tolerant bacterium biochemical treatment, MBR treatment, nanofiltration membrane treatment, electrodialysis treatment and electrocatalytic treatment is used; after the pesticide production wastewater is subjected to treatment, the water quality of produced water is high; when the system and the method are applied to enterprise production, water resources in the waste water are recovered; the general organic carbon content in the obtained sodium chloride salt wastewater is low; the system and the method can be used for chlor-alkali production; sodium chloride salt in the wastewater is recovered.

The invention belongs to the field of food seasonings, and particularly relates to a method for co-producing yellow rice wine and table vinegar by utilizing dendrobium nobile. The dendrobium nobile, rice and the like are used as raw materials to brew dendrobium nobile yellow rice wine, then by-product yellow rice wine dregs are mixed with bran, rice husks and wine to brew dendrobium nobile vinegar, and dendrobium nobile is used for co-producing yellow rice wine and vinegar. The yellow rice wine dregs obtained after dendrobium yellow rice wine is brewed are further utilized, the generation of solid waste is reduced while two products are obtained, which is more environmentally friendly, and economic benefits of enterprises can be improved. The umami of table vinegar is improved. The bioactive components in the table vinegar are improved, and the health-care effect of the table vinegar is further improved.

The invention discloses a method for co-producing m-toluic acid nitride and m-phthalic acid. The method takes a coarse distillation tower bottom liquid in an m-toluic acid production process as a rawmaterial and comprises the following steps: (1) adding the coarse distillation tower bottom liquid into nitric acid for reaction to obtain a nitration reaction solution; (2) filtering the nitration reaction solution obtained in the step (1) to obtain a first filtrate and a first filter cake, and washing and drying the first filter cake to obtain a product 2-nitro-3-methyl benzoic acid; (3) mixingthe first filtrate obtained in the step (2) with water to obtain a nitric acid aqueous solution, and carrying out an oxidation reaction to obtain a nitric acid oxidation reaction solution; and (4) crystallizing and filtering the nitric acid oxidation reaction solution obtained in the step (3) to obtain a second filtrate and a second filter cake, and refining the second filter cake to obtain the products 2-nitro-3-methyl benzoic acid, 2-nitro-5-methyl benzoic acid, 3-methyl-4-nitro benzoic acid and isophthalic acid. The method has the advantages of simple process, low equipment investment, environmental protection and good comprehensive benefits.

The invention discloses a filtering device and a filtering method for reducing nuclear power filtering solid waste quantity. The filtering device comprises a filter shell, a filter element assembly, a water inlet pipe, a water outlet pipe, a water inlet valve, a water outlet valve and a filter element cleaning structure, wherein the filter element assembly is arranged inside the filter shell, a water inlet and a water outlet are formed in the filter shell, a water inlet pipe is arranged at the water inlet, and a water inlet valve is arranged on the water inlet pipe; the water outlet pipe is arranged at the water outlet and is provided with a water outlet valve; and the water inlet is positioned below the water outlet. According to the filtering device, the filter element cleaning structure is arranged, the filter element assembly can be cleaned and regenerated, the problem that an original filter element cannot be recycled is solved, the filtering device is adopted for filtering, long-term operation can be achieved, the filter element does not need to be frequently replaced, and the filtering device has the advantages of reducing the maintenance frequency, reducing the solid waste output of the filter element and reducing filter element solid waste quantity. And the device is suitable for radioactive water filtration of the nuclear power station.

The invention discloses a method for extracting hemicellulose from waste paper, the method specifically comprises the following steps: 1) dispersing and beating the waste paper into waste paper pulp by using a hydrapulper, and filtering to remove non-paper pulp impurities; (2) dipping the waste paper pulp filtered in the step (1) in a 5-20% sodium hydroxide solution for 0.5-4 hours to obtain a material A; 3) performing solid-liquid separation treatment on the material A to obtain impregnated waste paper and impregnation liquid, and collecting the impregnation liquid as a material B; 4) pretreating the material B with a filter bag, then treating with a nanofiltration membrane to obtain a concentrated solution and a filtrate, and collecting the concentrated solution as a material C; 5) adding acid into the material C to obtain a precipitate which is a material D; 6) treating the material D with a ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, collecting the concentrated solution as a material E, and 7) drying the material E to obtain the hemicellulose dry powder. The method has the advantages of high efficiency, low cost, no generation of three wastes, small influence on the environment and the like.

The invention discloses a method for reducing residue output in a sodium hydrosulfite production process, the method comprises the following steps: S1, pumping sodium hydrosulfite rectification residual liquid into a first-effect evaporator, heating with steam, evaporating, and concentrating in a second-effect evaporator to obtain concentrated liquid and condensate; s2, feeding the concentrated solution into a curing kettle B, heating and concentrating with steam, discharging to a centrifugal head tank, feeding into a centrifugal machine, and centrifuging to obtain sodium formate and centrifugal mother liquor; s3, pumping the centrifugal mother liquor into a curing kettle A, continuously heating and concentrating with steam, adding methanol for extraction after concentration, removing supernatant liquid, connecting other materials with a metal hose, putting the other materials into a dryer, carrying out pressure filtration with nitrogen to obtain pressure filtration mother liquor, and treating the pressure filtration mother liquor to obtain sodium formate; s4, after the four-in-one mother liquor tank reaches a second preset liquid level, pumping liquid in the four-in-one mother liquor tank into an evaporation kettle, gasifying methanol, condensing and recycling so that a kettle bottom concentrated solution is sodium hydrosulfite residues. The method has the beneficial effect of reducing the generation amount of residues.

The invention discloses a device and a method used for cobalt source storage source well water processing. The device comprises a pump, an active carbon filter, a membrane processing system, and a two-stage multi-medium mixed ion exchange column. Compared with the prior art, the advantages are that: the membrane processing system is adopted for condensation of extremely low concentration radionuclide or other ionic state impurities in well water, and an obtained concentrated solution is delivered through the two-stage multi-medium mixed ion exchange column, so that resin adsorption rate on radionuclide and impurities in unit time is accelerated, efficiency is increased, solid waste generation amount is reduced, and a problem in the prior art that only pure physical separation can be realized using the membrane processing system. Design of the distribution position of inlet water, reflux water, produced water, and concentrated water in well water is capable of realizing well water automatic circulation, and solving a problem that effective purifying of bottom precipitate is impossible to realize; and the device and the method can be both used for routine source well water purifyingand source well water pre-decommissioning fine processing, and the target of the invention is achieved.

The invention discloses a trapping device and process for production of 3,4-dichlorobenzonitrile. The device is simple and reasonable in structural design; the implementation feasibility is high, thepracticability is high, more than 90% of ammonium chloride and more than 8% of 3,4-dichlorobenzonitrile are captured by a first-stage catcher through a dry capture method, more than 76% of 3,4-dichlorobenzonitrile is captured by a second-stage catcher through a dry capture method, latent heat of vaporization of water is fully utilized by the first-stage catcher, and the usage amount of spray liquid-water is small; besides, about 15% of the 3,4-dichlorobenzonitrile crude product collected by a third-stage catcher and a bath tower is dissolved by hot water, dehydrated, rectified and purified toobtain a liquid pure product of 3,4-dichlorobenzonitrile. The generation amount of coke oil and solid waste during the rectification process is low. Compared with a traditional multi-stage wet capturemethod, the consumption of 3,4-dichlorobenzonitrile is reduced, the investment cost of rectification equipment is reduced by more than half, the rectification energy consumption is equivalent to 15%of that of the traditional method, and the economic benefit is good.

The invention discloses a system for recovering acid and alkali from high-salt-content deacidification wastewater. The system is characterized by comprising a homogenizing tank, a first reaction tank, a second reaction tank, a sedimentation tank, a concentration tank, an ultrafiltration device, an ultrafiltration water producing tank, a nanofiltration device, a nanofiltration water producing tank, a reverse osmosis device, a reverse osmosis concentrated water tank and a bipolar membrane electrodialysis device which are connected in sequence, a CaCl2 dosing device is arranged over the first reaction tank, a Na2CO3 dosing device is arranged over the second reaction tank, and a hydrochloric acid dosing device is arranged above the ultrafiltration water producing tank. According to the method, NaCl in the deacidification wastewater can be effectively separated through cooperation of chemical reaction and membrane treatment devices with different levels of precision, and NaOH and HCl are prepared through electrodialysis, so that acid and alkali can be recycled from the deacidification wastewater, the resource utilization of the deacidification wastewater is realized, the solid waste output is reduced, and the energy conservation and emission reduction degree is improved.

The invention relates to the field of waste treatment, in particular to a method for treating waste acid in a titanium dioxide production process. The invention aims to solve the problem that a large amount of solid waste is generated due to the fact that waste acid generated in titanium dioxide production by a sulfuric acid method is neutralized by quicklime. The implementation process of the method comprises the steps of adding quick lime into waste acid according to a certain mass ratio, uniformly mixing to generate calcium sulfate precipitate, and separating the precipitate through a settling pond; and adding a sodium hydroxide or potassium hydroxide solution with a certain concentration into the residual solution according to a certain proportion to obtain iron hydroxide precipitates, filtering the precipitates, centrifugally separating and then drying at a certain temperature to obtain magnetic ferroferric oxide, wherein the residual aqueous solution can be concentrated to prepare sodium sulfate or potassium sulfate and can also be reused in the rinsing process. The method can greatly reduce the solid waste generation amount in titanium dioxide production, can generate remarkable economic benefits, and has a wide application prospect.

The invention belongs to the technical field of water treatment and particularly provides an arsenic removal device with monitoring and regenerating functions and a use method thereof. The arsenic removal device consists of a main body, a regenerating device, a monitoring system and a power control system, wherein the main body is a fixed bed processor equipped with an inner core made from a cloth-shaped arsenic adsorption fiber material. The arsenic removal device is characterized in that the cloth-shaped arsenic adsorption fiber material is adopted to manufacture the arsenic removal inner core, the arsenic removal inner core is formed by rolling the cloth-shaped arsenic adsorption fiber material around a central shaft, the arsenic removal inner core is cylindrical, is tight in interlayer lamination and is vertically mounted in a housing, and no gap exists between the layers of the cloth-shaped arsenic adsorption fiber material or between the arsenic removal inner core and the inner wall of the housing; the regenerating system consists of a regenerated liquid tank, a pump valve and a pipeline; and the monitoring system consists of a quartz column with a rapid arsenic detection reagent and comparison columns. The arsenic removal device has the advantages of excellent water permeability, high arsenic removal efficiency, easy desorption regeneration and the like, can monitor the arsenic concentration of water in real time and provides instructions for desorption regeneration while ensuring that the effluent meets the discharge standard.