48results about How to "Reduce effluent COD" patented technology

The invention discloses an excess sludge treatment method which comprises the following steps: adding excess sludge to a reaction tank, with high speed stirring at 15-50 DEG C, adding a surfactant and sodium percarbonate to the reaction tank, after 0.5-5h of reaction, adding nano zero-valent iron, at 15-50 DEG C reacting for 1-8h, sending the sludge into a magnetic separator to remove the nano zero-valent iron containing heavy metals in the sludge; performing mechanical dewatering of the treated sludge to respectively obtain purified sludge and water. The excess sludge treated by the method is low in water content and high in heavy metal removal rate, the treated water is low in (chemical oxygen demand) COD value, and the excess sludge treatment method is low in cost, green, and free of secondary pollution, and can lay a foundation for agricultural or forestry sludge or other resource method.

The invention relates to a 1,4-butanediol chemical waste water treatment technology, and belongs to the technical field of environment engineering. The 1,4-butanediol chemical waste water treatment technology comprises that high-density 1,4-butanediol production waste water is fed into a homogenization pond; the high-density 1,4-butanediol production waste water is fed into a two-stage aerobic reaction pond through an elevator pump; the high-density 1,4-butanediol production waste water treated by an aerobic reaction flows automatically into a settling pond; after muddy water is separated from the high-density 1,4-butanediol production waste water in the settling pond, the high-density 1,4-butanediol production waste water is discharged; and a part of the muddy water flows back to the two-stage aerobic reaction pond and the rest of the muddy water is dehydrated and then discharged, wherein a first section of the two-stage aerobic reaction pond is added with a biological carrier filling material and a second section of the two-stage aerobic reaction pond does not need a carrier filling material and is added only with sludge. The 1,4-butanediol chemical waste water treatment technology has the advantages of device work stabilization, high efficiency, stable quality of yielding water, convenience of automatic control, management and operation, and low operating cost.

The invention belongs to the field of extraction and phenol removal of high-concentration phenol-containing coal chemical industry wastewater and discloses a method for extracting a high-concentration phenol-containing coal chemical industry wastewater solvent at high temperature by using methyl isobuthyl ketone. The method comprises the following steps: mixing the methyl isobuthyl ketone and the high-concentration phenol-containing coal chemical industry wastewater by using a static mixer and clarifying by using an oil water separator to obtain an extraction phase and a raffinate phase; or directly extracting the methyl isobuthyl ketone and the high-concentration phenol-containing coal chemical industry wastewater in a mixing and clarifying device in advance to obtain an extraction phase and a raffinate phase; performing countercurrent extraction on the extraction phase and the raffinate phase in an extraction tower to obtain a secondary extraction phase and a secondary raffinate phase respectively; allowing the secondary extraction phase to enter a rectifying tower to separate to obtain the methyl isobuthyl ketone and crude phenol; allowing the secondary raffinate phase to enter another rectifying tower to separate to obtain the methyl isobuthyl ketone and extracted water; allowing the methyl isobuthyl ketone obtained through separation to enter a solvent storage tank in a concentrated mode and recycling; and allowing the extracted water to enter a subsequent biochemical treatment section to perform further treatment.

The invention provides a modified FeS nano-particle as well as preparation method and application thereof, wherein the modified FeS nano-particle comprises aFeS nano-particle and cross-linked polyvinylpyrrolidone; the cross-linked polyvinylpyrrolidone wraps on the surface of the FeS nano-particle to form a shell-core structure; the mass ratio of the cross-linked polyvinylpyrrolidone to the FeS nano-particle is (0.1-0.5):1.1. The preparation method of the modified FeS nano-particle c comprises the following step: importing N2 to stir and mix a cross-linked polyvinylpyrrolidone solution and a FeCl2.4H2O solution, dropwise adding an Na2F.9H2O solution under the condition of importing N2 and stirring to obtain the modified FeS nano-particle. The modified FeS nano-particle provided by the invention is high in reaction activity and large in specific surface area; both the Fe2+ and the S2- of the FeS nano-particle have reducing property and can be applied to the treatment of chromate wastewater, so that compared with the present widely applied zero-valent iron nano-particles, the modified FeS nano-particle is better in treatment effect.

The invention relates to a composite microbial preparation for assisted treatment of waste cutting fluid. The composite microbial preparation comprises Bacillus licheniformis solid powder, Pseudomonas fluorescens solid powder, catalase and lipase, wherein the four components are mixed, the obtained mixture is added to an active sludge pool, a contact oxidation pool or an aerobic tank, and sewage treatment is performed. According to the present invention, the Bacillus licheniformis and the Pseudomonas fluorescens rapidly grow and breed by using the easily-degraded organic matters in the sewage, and can rapidly degrade the macromolecular organic matters in the wastewater when the Bacillus licheniformis and the Pseudomonas fluorescens grow to achieve a certain concentration, the catalase can rapidly eliminate the OH. free radicals in the system so as to reduce the toxic effects on bacteria and improve the oxygen utilization rate, and the lipase is used for decomposing the organic matters such as animal and vegetable oils in the wastewater, such that various components work in the matched and synergetic manner, the COD in the effluent is significantly reduced, the components are simple and easy to obtained, the cost is low, the additional equipment is not required during the use, the operation is simple, the risk is low, the treatment efficiency of the system can be significantly improved, the stability of the system can be enhanced, the COD in the effluent can be reduced, and the final standard discharge can be achieved.