44results about How to "Reduce CODcr" patented technology

The invention discloses a deep treatment technique used for the printing and dyeing sewage recovery. The technique consists of a BAF pond, an air-bearing system, an ozone contact oxidation tower, a filter, an active carbon filter, an ozone generator and a medicine adding system. The technique is the improvement of the traditional BAF technique, removes the resolvable organism in the sewage through the biological degradation, outtakes the water into the air-bearing system and combines the flocculation medicine adding technique, so as to eliminate the non-solvent organism and colloidal substance in the sewage. The outtaken water enters into the ozone contact oxidation tower and gets mixed with ozone, so that the organism which is difficult to undergo the biological degradation in the printing and dyeing sewage is removed with the help of the strong oxidizing property of the ozone. The water flowing out of the ozone contact oxidation tower enters into the pond at the middle, and 30 percent of the water returns to a gas dissolving can under the action of a pressurizing pump, gets mixed with the pressurized air and then enters into the air-bearing system through utilizing the remaining pressure. The gas-water solution is dispersed into the small and equable drips through a dissolved gas releaser, and the drips drive the suspending substances and the colloidal substance to float up to the water surface so as to achieve the removal. The water coming out of the middle pond enters into the filter to remove the small suspending substances and enters into the ozone/active carbon filtering system so that the reaction of the ozone basic chain is caused under the action of the active carbon, thereby speeding up the decomposition of the ozone into OH and other free radicals, degrades a small amount of organism, eliminates the color and finally ensures that the outtaken water reaches the recovery standard of the printing and dyeing sewage.

The process of treating effluent from making paper with waste paper belongs to the field of industrial effluent treating technology, and aims at lowering the harmful matter content in the effluent from making paper with waste paper to reach the exhaust standard. The process includes the first passing the effluent through grating to filter out fiber and suspended matter, the subsequent settling in a sloping plate settling tank to eliminate granular impurity, flocculating in an air floating tank with flocculant and fishing out the resultant suspended matter, anaerobic reaction in an anaerobic settling tank, treating with introduced air and active sludge in an aeration tank and eliminating suspended matter and colloidal matter, clarifying in a settling tank, and treating in artificial wetland to eliminate nitrogen and phosphate and obtain clear water. The process can reduce SS, BOD5 and CODcr of the effluent obviously and make the effluent reach draining standard.

A resource treatment of p-aminophenol production waste water is carried out by regulating pH of p-aminophenol production waste water, filtering, selectively removing p-nitrochlorobenzene and p-nitrophenol etc. organic impurities from hydrophobic macro-porous resin, selectively adsorbing and recovering p-aminophenol from sulfoacid composite modifying resin, obtaining colorless transparent outlet water, after advanced treating the outlet water for diaphragm electrolysis requirement, recovering sodium chloride of waste water, eluting hydrophobic macro-porous adsorbing resin from organic solvent, desorbing sulfoacid composite modifying adsorbing resin from dilute acid and water, recovering p-aminophenol from high-concentrated desorbed liquid, and applying mechanically for next de-sorption from low-concentrated desorbed liquid. It achieves less organic pollution and resource utilization.

The invention provides a DNT (Dinitrotoluene) production wastewater recycling and treatment system and method. The DNT production wastewater recycling and treatment system comprises a sedimentation tank, wherein the sedimentation tank is communicated with a filter, the outlet of the filter is communicated with the inlet of a macroporous adsorption resin column, the macroporous adsorption resin column is also provided with a desorption liquid inlet and a desorption liquid outlet, the desorption liquid inlet of the macroporous adsorption resin column is communicated with an organic solvent storage tank, the desorption liquid outlet of the macroporous adsorption resin column is communicated with a desorption liquid storage tank, and the desorption liquid storage tank is communicated with a rectifying tower. DNT in the wastewater is adsorbed through the macroporous styrene adsorption resin to prevent DNT from flowing out along with the wastewater, the resin is subjected to desorption and regeneration using an organic solvent, the desorption liquid is collected for rectification to separate out DNT, and DNT is recycled. The method is simple in operation process, not only is wastewater treated, but also DNT in the wastewater is recycled, and the method can be applied to continuous wastewater treatment, and is low in cost and suitable for industrialized large-scale DNT wastewater treatment.

The invention discloses a purified terephthalic acid wastewater treatment method, which treats the purified terephthalic acid wastewater through highly efficient catalytic oxidation and dual-membrane bio-reaction tank combined technology to enable the COD of the wastewater to be reduced from 4,000-6,000 mg/L to 100 mg/L below, and enable the terephthalic acid to be reduced from 1,000-2,000 mg/L to 10 mg/L below. The catalytic oxidation takes air and chlorine dioxide as an oxidant, and takes activated carbon as a catalyst; the organic volumetric load of a primary membrane bio-reaction tank reaches 2.85-4.5kg COD/m3.d, while the organic volumetric load of a secondary membrane bio-reaction tank reaches 0.4-0.8kg COD/m3.d.

The invention relates to a flocculant for sewage treatment. The flocculant is prepared by compounding the raw materials of polyacrylamide, starch, sodium hypochlorite, sodium carboxymethylcellulose, sodium silicate, potassium peroxydisulfate, sodium sulfite and water. The prepared flocculant has the advantages of green and environmental protection, low cost, small addition amount, quick flocculation speed, little sludge, convenience and safety in use and the like.

The invention relates to a preparation method of a flocculant for sewage treatment. The flocculant is compounded from the raw materials, namely polyacrylamide, starch, sodium hypochlorite, sodium carboxymethyl cellulose, sodium silicate, potassium persulfate, sodium sulfite and water. The flocculant prepared by the method disclosed by the invention has the advantages of greenness, environment-friendly property, low cost, low dosage, fast flocculation speed, less sludge, convenience in use, safety and the like.

The invention aims at providing an ultramicro pulpy disperse dye for terylene dyeing. The ultramicro pulpy disperse dye has the viscosity of more than 3000 cp (an NDJ-1 viscometer), is used for the terylene dyeing, has the advantages of no dust, no foam, no cohesion and sedimentation, no migration, pure color and luster, high color yield, greatly reduced dyeing usage amount and good color fastness without reduction clearing and soaping after the dyeing, multiply reduces the polluted water dyeing and the polluted water discharge, reduces the CODcr (Chemical Oxygen Demand) contained in polluted water and opens a new way for the clean production of printing and dyeing mills.

The invention relates to a production method for an adsorbent coupling chitosan and bamboo charcoal by dialdehyde. The method comprises the preparation of chitosan acid solution, the pretreatment of bamboo charcoal, the preparation of acid mixed solution of bamboo charcoal and chitosan, the preparation of a coupled reactant of chitosan and bamboo charcoal, and the preparation of the bamboo charcoal adsorbent coupled with chitosan. The invention relates to the production method for the adsorbent for domestic sewage treatment. Compared with bamboo charcoal and activated sludge applied to the domestic sewage treatment, the adsorbent prepared by the method has better effects of reducing CODcr, turbidity and ammonia nitrogen in the domestic sewage.

The invention relates to the technical field of treatment of textile printing and dyeing wastewater, in particular to a combined process for treating textile printing and dyeing wastewater, comprising the steps such as neutralizing, coagulating and precipitating, filtering with an O/A combined biofilter, activating with an active enzyme promoter, adsorbing with a constructed wetland tank, precipitating, sterilizing, and discharging; the combined process provided by the invention has good wastewater purifying effect and enables continuous treatment of batch production wastewater.

The invention discloses a rapid biological denitrification method for biochemical effluent of landfill leachate, belonging to the field of water treatment. The rapid biological denitrification methodcomprises the following steps: 1) selecting Bacillus pumilus AD 0599 as a denitrifying strain; 2) subjecting the denitrifying strain to multiplication culture obtain bacteria, and mixing the obtainedbacteria with anaerobic sludge at the biochemical front end of the landfill leachate to obtain a seed strain; 3) placing the seed strain at the bottom of a denitrification filter, loading granular activated carbon, and introducing activated wastewater into the denitrification filter for activation; and 4) stopping the introduction of the activated wastewater, adding a carbon source, and then introducing the landfill leachate for denitrification. The method of the invention can directly perform rapid biological denitrification on the low-carbon-nitrogen-ratio biochemical effluent of the landfill leachate. The Bacillus pumilus is selected and used, and nitrate nitrogen in the biochemical effluent can be quickly denitrified and removed by adding only a small amount of the carbon source; at the same time, the CODcr of the effluent can be further reduced, so pressure on subsequent membrane separation can be alleviated.

The invention discloses a wastewater treatment process for hydrogen peroxide production, and relates to a wastewater treatment process. According to the method, the problem of hydrogen peroxide production wastewater treatment is thoroughly solved mainly through a combined process of iron-carbon micro-electrolysis, Fenton oxidation, coagulating sedimentation, hydrolytic acidification and CASS (cyclic activated sludge system). Firstly, an iron-carbon micro-electrolysis-Fenton oxidation pretreatment process is applied, ring opening is performed, heavy aromatics in sewage are reduced, the wastewater is easy to degrade, and the load of biochemical treatment is reduced; then, coagulating sedimentation treatment is carried out to remove total phosphorus; and finally, a hydrolytic acidification and CASS scheme is used to deeply remove CODcr and phosphate, so that the wastewater reaches the discharge standard. The combined process has the advantages of wide application, good treatment effect, simplicity in operation and management and low cost.

The invention provides a granular spontaneous micro battery sewage treatment agent which comprises gas ashes, a recycling iron powder, biomass and ordinary clay in the mass ratio of 35-55:28-38:7-11:10-16. A preparation method of the granular spontaneous micro batery sewage treatment agent comprises the following steps of uniformly mixing the gas ashes, the recycling iron powder, the biomass and the ordinary clay in the mass ratio of 35-55:28-38:7-11:10-16; rolling a mixed powder in a disk type ball maker to make balls; arranging the balls in a high-temperature sintering furnace with the reduction atmosphere to sinter for 45-60min at the temperature of 1120-1200 DEG C; and cooling to the room temperature. The invention has simple preparation technology and uses industrial wastes and plant straws, thereby being environment friendly and energy saving. The prepared sewage treatment agent utilizes the power spontaneously generated by a micro battery to break down pollutants which are difficult to degrade in water.

The invention discloses a method for generating a byproduct, namely low carbonate ester, in the fipronil intermediate precursor production process, and aims to solve the problem that an organic solvent is discharged in a conventional process. The method is characterized by comprising the following steps: with acetic acid of a conventional process as a solvent, replacing acetic acid with low carbonacids such as formic acid and propionic acid as a solvent, and preferably optioning the formic acid as the solvent; and putting one alcohol of low carbon alcohols such as methanol, ethanol and propanol into a condensation reaction liquid, condensation extraction inorganic phase or a detergent, preferably adding methanol, heating, and performing normal-pressure or vacuum esterification reaction distillation, thereby obtaining a low polycarbonate byproduct. The method has the beneficial effects that the content of salts in production wastewater is reduced, CODcr in the production wastewater isreduced, and a low carbonate ester product can be also produced as a byproduct.

The invention discloses a method for treating pot bottom water through low-cost anaerobic fermentation. The method comprises the following steps of (1) sequentially filtering and diluting a pot bottom water stock solution, and adjusting the pH value to 5-5.5 to obtain a fermentation solution; and (2) loading the fermentation solution obtained in the step (1) into a fermentation tank, adding 15-25 g/L of pit mud containing anaerobic microorganisms, and culturing at the temperature of 30-45 DEG C for 7-15 days to complete the pot bottom water treatment. According to the method, zero discharge of industrial wastewater generated in the white spirit production process is realized, the obtained fermentation solution can be used for the white spirit brewing fermentation process again, the production requirements of increasing the content of ethyl hexanoate and reducing the content of ethyl lactate in the white spirit industry are met, and the problems that in the prior art, the pot bottom water treatment difficulty is large, the treatment cost is high, organic matter in the pot bottom water is not effectively utilized, and secondary pollution is caused by emission are effectively solved.

The invention relates to a method for preparing an adsorbent by coupling chitosan with bamboo charcoal by using monoaldehyde. The method comprises the following steps of: preparing acid solution of the chitosan; pre-treating the bamboo charcoal; preparing acid mixed solution of the bamboo charcoal and the chitosan; preparing a coupling reactant of the chitosan and the bamboo charcoal; and preparing a bamboo charcoal adsorbent coupled with the chitosan. The invention relates to a production method of the adsorbent for treating domestic sewage. The adsorbent produced by the method has better effect of reducing CODcr, turbidity and ammonia nitrogen of the domestic sewage than the bamboo charcoal or activated sludge.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a process for treating high-salt and high-concentration organic wastewater, which comprises the following steps of: S1, evaporation and concentration, S2, wastewater neutralization, S3, flocculent precipitation, S4, organic matter decomposition, S5, steam-water separation and S6, saline-water separation. According to the method, the existing high-salt and high-concentration organic wastewater treatment process flow is simplified, so that the wastewater treatment capacity is reduced, the treatment difficulty is reduced, and the wastewater treatment cost is remarkably reduced; and meanwhile, the problem that the quality of solid salt is reduced due to enrichment of high-salt-containing organic matters is solved, the whole process of removing the organic matters through evaporation desalination is continuously operated, the quality of the solid salt is improved, and the method can be widely applied to desalination treatment of high-salt wastewater in various industries.

The invention relates to in-situ mineralization auxiliary agents SZK and SZH and after backwashing method used in dyed slubbing after backwashing. The auxiliary agent SZK is composed of 0.001 to 10% of sulfamic acid, 0.001 to 5% of polyacrylic acid, 0.001 to 3% of potassium chloride, 0.001 to 3% of copper sulphate, and the balance water; and the auxiliary agent SZH is composed of 5 to 15% of potassium permanganate, 1 to 5% of carboxymethyl cellulose, 1 to 10% of anhydrous sodium sulfate, and the balance water. According to the after backwashing method, dyed slubbing is delivered though after backwashing bath containing the auxiliary agent SZK and after backwashing bath containing the auxiliary agent SZH successively for washing, wherein water bath temperature and concentration, and slubbing moving speed are controlled. In-situ mineralization is adopted in after backwashing process, so that advanced water-saving and emission reduction are realized; operation requirements are low; operation is simple; and popularization is convenient to realize.

The invention discloses an efficient catalytic oxidation coupling hardness removal system and process for salt-containing wastewater of an oil gas field. The system comprises an adjusting water tank,a delivery pump and an integrated reaction device, which are sequentially connected. The integrated reaction device comprises a catalytic oxidation reaction device, a continuous reaction zone, a pH regulation zone, a softening reaction zone, a coagulation reaction zone, a flocculation reaction zone and a precipitation separation zone, which are sequentially connected. The adjusting water tank, thecatalytic oxidation reaction device, the continuous reaction area and the pH adjusting area are all connected with fans. Both the softening reaction zone and the precipitation separation zone are connected with a sludge reflux pump. The catalytic oxidation reaction device is connected with a DC power supply. Compared with the prior art, the treatment device has the positive effects that the treatment device adopts a highly integrated integrated design, one device has two or three functions, the occupied area is reduced, the management is convenient, and the labor intensity of workers is reduced; the chemical agent is utilized to the maximum extent; the biodegradability is improved, and CODcr in water is reduced.

The invention provides a composite biological digestion agent as well as a preparation method and application thereof. The biological digestion agent provided by the invention is prepared by the following steps: uniformly mixing a trichoderma koningii strain extracting solution, a bacillus licheniformis strain extracting solution, a geobacillus stearothermophilus strain extracting solution, an aspergillus niger strain extracting solution and an aspergillus nidulans strain extracting solution to obtain a mixed extracting solution; then immersing zeolite in the mixed extracting solution; soakingand taking out the zeolite; drying the zeolite to obtain the composite biological digestion agent. In 2016, the biological digestion agent provided by the invention is used for governing a black andodorous river in the Putuo district, Shanghai; the experimental result indicates that the biological digestion agent provided by the invention can remarkably reduce CODcr, BOD5, NH3-N and TP value inthe black and odorous river.