54results about How to "High COD removal rate" patented technology

The invention discloses a preparing method of an ozone oxidation catalysis catalyst for degrading organic wastewater. The catalyst is a multi-component-loaded catalyst and comprises a catalysis carrier and catalytic active components, wherein the catalytic active components are multi-component metal oxides. The catalyst has high catalysis efficiency and stability in the process of ozone catalysistreatment on the high-chlorine organic wastewater, the active components of the catalyst have a good synergistic effect, the advanced treatment efficiency for the high-chlorine organic wastewater is improved, and meanwhile, the compressive strength of the catalyst is high; after the high-chlorine organic wastewater with the COD of 70-120 mg/L and the chlorine ion content not larger than 8,000 mg/Lis subjected to catalytic treatment, the COD content can reach the national grade-one sewage discharge standard; meanwhile, the preparing method of the catalyst is simple, the load quantity of the active components is precisely controlled, the active components are uniformly dispersed, no waste slags or wastewater is generated in the preparing process, and the preparing method is free of pollution and environmentally friendly.

The invention provides a method for treating polyether polyol wastewater and relates to the technical field of treatment of refractory organic wastewater. The method particularly comprises the following steps of: carrying out high-efficiency catalytic oxidation pretreatment on the polyether polyol wastewater; and entering the polyether polyol wastewater to enter a biochemical stage, wherein the biochemical stage is divided into a biochemical strengthening stage and an aerobic treatment stage. Most dissolved micromolecule organic poisons in the polyether polyol wastewater are removed by high-efficiency catalytic oxidation; the biotoxicity of the polyether polyol wastewater is greatly reduced; a B/C ratio (the B/C ratio is improved to the range of 0.42 to 0.65) of high-efficiency catalytic oxidation pretreatment effluent is obviously improved; the biochemical treatment load is reduced; and the biochemical treatment effluent is ensured stable and is ensured to reach the standard. The treatment method disclosed by the invention has the characteristics that the treatment method is efficient and rapid, has low cost, is safe and reliable, is easy to realize the large-scale industrial application and the like.

The invention discloses a deep treatment method of high-concentration organic wastewater. The method comprises the following steps: step one, coagulating and precipitating; step two, carrying out ultraviolet-ozone-ultrasound combined reaction stage; step three, carrying out electrolysis treatment through three dimension electrodes; step four, recycling heavy metals; and step five, carrying out ultrafiltration-electrodialysis coupled desalinization. The deep treatment method of high-concentration organic wastewater is free of biological treatment processes, free of pretreatment, high in desalinization rate, simple to operate, high in efficiency, free of secondary pollution and low in cost, and is capable of completely removing organic matters, recycling the heavy metals and recycling the high-concentration organic wastewater.

The invention relates to a preparing method of a composite coagulant used for treating printing and dyeing waste water.The method comprises the steps that an industrial by-product waste hydrochloric acid and aluminum profile industry aluminum-containing waste residues are added into a reaction kettle sequentially, stirring is carried out in a heat-preserving mode at normal pressure, and aluminum residue water with AlCl3 as an effective ingredient is obtained; a liquid heavy metal capture agent is put into the aluminum residue water, stirring is carried out, and plate-frame pressure filtration is carried out to obtain faint yellow clear aluminum-containing liquid; industrial-grade CaCl2 is put into the aluminum-containing liquid, and stirring is carried out; the stirring reaction is carried out in a heat-preserving mode at the normal pressure, and supernatant liquid subjected to natural sedimentation is the liquid composite coagulant.The preparing method has the advantages that the preparation technology of the composite coagulant is simple, the raw materials are wide in source, and cost is low; the product performance is stable, the added amount of chemical is small, floc is compact, and the sedimentation speed is high; the composite coagulant has good decoloration performance and a high COD removal rate, and the actual printing and dyeing waste water chroma removing rate and the COD removal rate can be 10-15% higher than those of PAC sold in the market.

The invention relates to a preparation method of a polyaluminium sulfate zinc composite flocculant, and belongs to the field of synthesis of flocculants for environmental protection engineering. The preparation method of the polyaluminium sulfate zinc composite flocculant comprises the following steps: respectively preparing aluminium salt and zinc salt into solutions with certain concentrations at a room temperature, mixing according to a certain zinc-aluminium mass percent, slowly dropwise adding a pH conditioning agent solution with a certain concentration on a magnetic heating stirrer, stirring for 15-30 minutes so as to obtain a stable clear colorless polyaluminium sulfate zinc composite flocculant, and drying at 50 DEG C, thus obtaining hypocrystalline white solids. The polyaluminium sulfate zinc composite flocculant has the advantages of low dosage, large and dense alumen ustum, fast settling velocity and few aluminium metal ion residues and can stabilize for one year. The polyaluminium sulfate zinc composite flocculant prepared by the method can be used for treating drinking water, raw water and wastewater and has no toxic or side effect. The preparation method of the polyaluminium sulfate zinc composite flocculant has the advantages of simple production process, simple production equipment, low production cost, good flocculation effect, low investment cost and the like.

The invention discloses a sewage treatment system using LNG cold energy. The system uses the LNG cold energy to directly and/or indirectly treat sewage; the indirect treatment mode is characterized inthat impurities are removed from the sewage through supercritical carbon dioxide extraction, and the corresponding system comprises a supercritical carbon dioxide sewage treatment device (12), an extract separator (13), an air separation system (9) and an oxygen-rich combustion system (10); and the direct treatment mode is characterized in that the sewage is treated through a freezing process, and the corresponding system comprises a freezing process sewage treatment device (4). The structure, the arrangement mode and the corresponding cold energy utilization mode of the key assemblies of thesystem are improved, the problem of limited sewage treatment using natural cold energy in the prior art is effectively solved, and the sewage treatment system also can be used together with an oxygen-rich combustion assembly, and has the advantages of full utilization of the LNG cold energy, realization of zero discharge of carbon, and good environmental protection effect.

The invention discloses a Fenton oxidation treatment method for wastewater. The addition of hydrogen peroxide and ferrous sulphate can be determined to remove COD in wastewater according to the COD ofthe wastewater. The advantages of the method are as follows: the removing rate of the COD in the wastewater can reach more than 80% by determining the addition of the hydrogen peroxide and the ferrous sulphate according to the COD of the wastewater, so that high removing rate of the COD of the wastewater can be achieved; and the method is low in hydrogen peroxide and ferrous sulphate price, abundant in source and low wastewater treatment cost.

The invention provides a catalyst and a preparation method thereof, and the method comprises the following steps: providing an organic polymer solution, and dipping a carrier into the organic polymersolution so that an organic polymer is loaded on the carrier; functionalizing the organic polymer loaded on the carrier by using a complexing agent to obtain a first precursor; preparing a transitionmetal-rare earth mixed solution, and soaking the first precursor in the mixed solution to obtain a second precursor; and drying and roasting the second precursor to obtain the catalyst. Through the concept, according to the invention, the organic polymer and the complexing agent are introduced, so that an organic polymer metal complex is formed in the preparation process of the catalyst; accordingto the preparation method, a part of transition metal ions are embedded into the crystal structure of the rare earth oxide in the roasting process to form a solid solution, so that the influence of the surface tension and solvation effect of the impregnation liquid on the dispersion of the active component is overcome, the dispersity of the active component on the carrier is improved, and the catalytic performance of the catalyst is improved.

The invention discloses a treatment system and a treatment method for antibiotic fermented wastewater. The system comprises a coagulation reaction pond, a first settling pond, a first neutralization pond, an anaerobic pool, an aerobic pond, a second settling pond, an acid adjusting pond, a Fenton reaction pond, a second neutralization pond, a third settling pond and an oxidizing pond which are connected, wherein stirrers are arranged in the first neutralization pond, the second neutralization pond and the Fenton reaction pond; a first coagulation stirring device is arranged in the coagulation reaction pond; and suspended carriers are arranged in the anaerobic pool and the aerobic pond, and the aerobic pond is connected to an aerating device. The system and method disclosed by the invention can effectively reduce COD in pharmaceutical wastewater, improves the biodegradability of a wastewater effluent, and is good in wastewater treatment effect; and the equipment is good in impact resisting effect, can be suitable for relatively large water fluctuation generated by the pharmaceutical wastewater, and is long in service life.