296results about How to "Reduce COD content" patented technology

The invention discloses a technique and a system for zero discharging treatment of electroplating effluent. The system comprises a material classifying pre-treatment system, a biochemical comprehensive treatment system, a membrane method system, a membrane concentrated liquor vaporization system and a sludge classifying treatment system which are connected with each other in turn, wherein the sludge classifying treatment system is connected with the material classifying pre-treatment system and the biochemical comprehensive treatment system; the raw wastewater enters into the material classifying pre-treatment system; water generated by the membrane method system is recycled; the condensed liquid from the membrane concentrated liquor vaporization system is re-injected into the material classifying pre-treatment system. According to the technique provided by the invention, the wastewater is firstly treated in classifying form, so that the heavy pollution ions, such as, chromium, cyanogen, nickel, and the like, and the oily matters in the wastewater are effectively removed, and then the biochemical comprehensive treatment system is used for further treating, and lastly, the RO+SuperRo two-level combination mode is utilized to achieve the gross recovery at 94%, and meanwhile, the liquid amount for evaporation treatment is less than 6% of the gross wastewater quantity, the cost of the evaporation treatment is saved, the sludge is recycled, the waste of resources is avoided and the sludge treating cost is saved.

The invention discloses an improved pulp bleaching technique for reed pulp paper-making, which comprises: first, using deoxylignin for bleaching, wherein, slurry concentration 8-20%, temperature 85-130Deg, oxygen consumption quanity 1-4.5Kg per ton slurry, NaOH consumption quanity 1-4Kg per ton slurry, and MgSO4 consumption quantiy 0.1-1.0%; second, using biological enzyme for bleaching, wherien, enzyme adding quanity 20-80g per ton slurry, temperature 30-80Deg, slurry concentration 5-16%, pH value 5-12, slurry hardness 2-8(KMnO4), and time 0.5-4h; third, adding hypochlorite for bleaching. This invention can reduce bleachability and back-yellow value, improves yield and slurry hardness, and decreases pollution to environment.

The invention discloses a kitchen wastewater treatment method which comprises the following steps: 1, chemical phosphorus removal is performed on kitchen wastewater flowing out from an IC (internal circulation) reactor; 2, after passing through a water quality equalization tank, the wastewater enters a CASS (Cyclic Activated Sludge System) to react, so that soluble substrates, organisms, phosphorus and an synchronous nitrification and denitrification effect are removed; 3, after the wastewater flows into an intermediate water tank to be subjected to volume regulation, the wastewater enters a Fenton oxidation reactor and an iron-carbon micro-electrolysis device so as to improve biodegradability of the wastewater; 4, after passing through the Fenton oxidation reactor and the iron-carbon micro-electrolysis device, the wastewater directly enters a hydrolysis acidification pool from the intermediate water tank, suspended matter and iron ions are removed and sludge is separated, hydrolyzed and acidified; 5, the wastewater is subjected to aerated oxidation to remove COD (Chemical Oxygen Demand) content; 6, the wastewater enters an MBR (Meane Biological Reactor) pool and hardly degradable substances are degraded, so that the drained wastewater reaches the take-over standard of a sewage treatment plant; 7, after the sludge discharged from a chemical phosphorus removal pool and the MBR pool is processed by a precision solid-liquid separator, solids are prepared into an organic fertilizer and filter-pressing liquid enters the water quality equalization tank.

The invention discloses a coking wastewater treatment process, which comprises the steps of extraction separation, heating, ammonia still, oil removal, water quality and water quantity regulation, biochemical treatment, flocculating settling and the like. Wastewater after the extraction separation is sent to the ammonia still step to be treated after being heated, and the ammonia still step is carried out under the condition of negative pressure. The noxious compounds such as ammonia, phenol and the like can be perfectly escaped from the ammonia, and the biochemical treatment load can be lightened. The biochemical treatment step is realized through a preaeration tank, an anoxic tank and an aerobic tank, a regulation tank is respectively communicated with the preaeration tank and the anoxic tank through a centrifugal pump and pipelines, pipelines communicated with the preaeration tank and the anoxic tank are respectively provided with a valve, the A/O process, the O/A/O process and the simultaneous proceeding of the A/O process and the O/A/O process can be switched according to different water qualities, and the invention can adapt to the coking wastewater with large water quality fluctuation. Through the treatment by the process, the wastewater reaches the first grade discharge standard specified by Discharge Standard of Water Pollutants for Iron and Steel Industry (GB 13456-92).

The invention relates to a method for purifying terephthalic acid in alkali-minimization waste liquor through acidolysis and crystallization, which comprises the following steps of: adsorbing to remove organic impurities and colored substances from the alkali-minimization waste liquor by using active carbon; adding a dilute acid solution into filtrate for acidolysis, and extracting the terephthalic acid from the waste liquor; drying and grinding a filter cake to obtain coarse terephthalic acid; dissolving and crystallizing the terephthalic acid by using a strong polar organic solvent, and performing recrystallization for multiple times to more effectively improve the purity of the terephthalic acid; and washing with water, filtering, drying, and refining the terephthalic acid to make the purity more than 99.8 percent, so that the terephthalic acid can be polymerized with glycol to produce polyester. By the method, the chemical oxygen demand (COD) of discharged wastewater can be effectively reduced, high-purity terephthalic acid can be obtained through recovery and purification, and waste materials can be reutilized.

The invention discloses an enzyme preparation. The enzyme preparation is characterized in that: one liter of the enzyme preparation comprises 0.5 to 20g of cotton seed hull removal enzyme, 0.2 to 20g of amylase, 0.5 to 10g of cellulose, and 1 to 100g of complex enzyme preparation of emulsifiable penetrant, wherein the pH of the complex enzyme preparation is 4 to 7. By applying the enzyme preparation, the conventional desizing and scouring process can be replaced. The defects of complex steps, high steam consumption, and electric power and sewage discharge value in the conventional fabric pretreatment processing are overcome, the damage to the fabric is reduced, the processing difficulty of pretreatment on cotton blend fabric and mixed fabric is reduced, and energy consumption, sewage and the chemical oxygen demand (COD) content in the sewage can be reduced.

The invention relates to a polyurethane carrier with a polydopamine hydrophilic layer attached to the surface thereof and a preparation method and application of the polyurethane carrier. The preparation method comprises: 1) dissolving dopamine in a buffer, and adding an oxidant to prepare a dopamine-modified solution; 2) soaking a polyurethane carrier in the dopamine-modified solution at the room temperature; and 3) taking the treated polyurethane carrier obtained from the step 2) out, cleaning the obtained polyurethane carrier, and performing drying to obtain the polyurethane carrier with a polydopamine hydrophilic layer attached to the surface thereof. The method is simple in process and easy to operate. The polyurethane carrier is beneficial for industrial application and has bright application prospects in the fields of water treatment, biology, medicine, petrochemical and energy.

The invention discloses a paint mist coagulant and a preparation method thereof. The paint mist coagulant comprises an agent A and an agent B, wherein the agent A is an aqueous solution which is prepared by taking a macromolecular polymeric metal salt as a main component; the macromolecular polymeric metal salt is aluminum salt or ferric salt; and the agent B is an aqueous solution which is prepared from a polyamide substance with the molecular weight of 9000000-12000000. In the application, paint wastewater, the agent A and the agent B are mixed according to a volume ratio of 500: 2: 1, paint in the paint wastewater agglomerates and floats upwards, the paint is separated from water to obtain clear water, and the clear water is reused; the application method is that the agent A is added and uniformly mixed firstly and then the agent B is added; and the treated paint wastewater is fat-soluble treated paint wastewater and water-soluble treated paint wastewater. The chemicals used in the invention are wide in source; the defects that the conventional process of preparing the paint mist coagulant is complicated and many complicated and expensive chemicals are added are overcome; the treatment cost of the ordinary paint wastewater can be reduced to 0.25 Yuan per ton; and the paint mist coagulant can be widely applied to circulating water treatment of a wet-type paint mist removing system.

The invention provides a system for treating printing and dyeing wastewater with activated coke adopted. The system comprises a hydrolytic acidification device, an activated sludge pool, a settling pool and a biological filter pool, wherein the hydrolytic acidification device, the activated sludge pool, the settling pool and the biological filter pool are arranged in a sequentially connected mode, activated coke is added into the hydrolytic acidification device, and discharging water with the activated coke and from the hydrolytic acidification device enters the activated sludge pool again. According to the system, the activated coke is added into the hydrolytic acidification device, the activated coke is fully mixed with the wastewater in the hydrolytic acidification device, so that standing time of recalcitrant molecules in the wastewater on the hydrolytic acidification device is improved, and efficiency of hydrolytic acidification is improved. The wastewater with the activated coke and from the hydrolytic acidification device enters the activated sludge pool again, the activated coke continues to have the function of absorption and degradation, and removal efficiency on sludge concentration and organic matter in the activated sludge pool is improved.

The invention discloses a preparation method for a polymer fat-liquoring agent containing a sulfosuccinate salt structure. The preparation method comprises the following specific steps of performing mono-esterification reaction on poly-hydroxy compound and unsaturated anhydride so as to prepare an intermediate A; performing reaction on the intermediate A, a vinyl monomer and an initiator, so as to prepare a polymer B containing active hydroxyls; further esterifying the polymer B by use of maleic anhydride; sulfonating by sulfite after regulating the pH, thereby obtaining the polymer fat-liquoring agent. The polymer fat-liquoring agent is obviously improved in aspects of stability, water solubility, acid resistance, fat liquoring effect, filling property and fat extraction resistance, and further can be used for reducing the COD (Chemical Oxygen Demand) content of waste liquid.

The invention discloses recycling and pretreatment methods of raw materials containing benzene thiazole alcohol pesticide industrial wastewater. The treatment method comprises the following steps of: regulating a pH value of wastewater, and filtering and removing a suspended matter in the wastewater; enabling a filtering liquid to pass through an absorption column filled with macroporous resins; stopping absorption when the absorption reaches to a leakage point, and using ethanol as a desorprtion agent for desorption and regeneration to obtain an ethanol solution containing benzene thiazole alcohol; rectifying a desorption liquid, using the evaporated ethanol as the desorption liquid for recycling and using the obtained benzene thiazole alcohol as the raw material, and returning to the original production process. The invention is simple in operation, can recycle the benzene thiazole alcohol in the wastewater and effectively reduces COD (Chemical Oxygen Demand) of the wastewater, and the absorption resins have good regeneration performance and can be repeatedly used.

The invention relates to a biological pulp and paper making wastewater zero discharge technique, which belongs to the technical field of paper making. The invention mainly improves the procedures of cooking and middle section water treatment. The cooking procedure adjusts the cooking technique, reduces the cooking pressure and shortens the cooking time, thereby effectively reducing the pulp extract and reducing the COD content in middle section water; and the middle section water treatment procedure modifies the rotary mixing type aerator in the bioaeration pool into a suspension-type aeration chain device, thereby enhancing the oxygen conversion efficiency by 5-10%, increasing the dissolved oxygen content in wastewater and enhancing the organic matter removal rate in wastewater on the premise of not increasing the power. The invention breaks through the normal procedure for the middle section water treatment, and treats the middle section water twice, so that all the treated water can be recycled. The invention realizes cyclic utilization of black liquor and zero discharge of middle section water, solves the problem of large amount of clear water of the paper machine, saves the water resources, reduces the environmental pollution and provides successful experience for non-xylogen paper making.

The invention discloses an emission reduction and cyclic utilization method for agricultural tail water and rural domestic sewage. The emission reduction and cyclic utilization method comprises the following steps: 1) collecting eutrophic runoff tail water by utilizing a storage and blending tank and carrying out temporary storage and aeration; 2) discharging the tail water which exceeds the capacity into an ecological channel pond; 3) culturing photosynthetic bacteria by utilizing one part of the tail water and utilizing the photosynthetic bacteria to improve the water quality and a feed additive; 4) discharging domestic sewage into a subsurface flow wetland and treating the domestic sewage; 5) temporarily storing biogas slurry by utilizing the storage and blending tank. According to the emission reduction and cyclic utilization method disclosed by the invention, the agricultural tail water with high nutrients is selected and is cyclically utilized after being temporarily stored and treatment pressure of the ecological intercepting channel pond is alleviated; eutrophic agricultural wastewater is cyclically utilized to the greatest extent; in a non-agricultural tail water water-draining season, the disadvantages of a current rural domestic sewage treatment facility can be made up by utilizing a nitrogen and phosphorus intercepting facility and sufficient utilization can be realized; the emission reduction and cyclic utilization method has the advantages of investment saving, high efficiency and less manpower needed by management and protection; meanwhile, the problem that a previous sewage collection and treatment process has many intermediate links is also solved.

The invention provides treatment technology of leather waste water. The treatment technology comprises the following steps: 1, firstly, filtering sulfur-containing waste water and chromium-containing waste water of leather waste water to remove foreign materials, respectively; performing homogenizing treatment, then performing reaction, and finally performing precipitation treatment to obtain sulfur-containing waste water and chromium-containing waste water; 2, performing homogenizing treatment and aeration treatment to other production waste water and the obtained sulfur-containing waste water and chromium-containing waste water, reacting the obtained waste water with manganese sulfate, adding a flocculating agent; and performing flocculation precipitation treatment to obtain mixed treated water and primary precipitation mud; 3, performing hydrolytic acidification treatment to the mixed treated water, and performing intermediate precipitation treatment to obtain intermediate treated water and intermediate precipitation mud; and 4, performing bio-contact oxidation treatment to the intermediate treated water, and performing intermediate precipitation treatment to obtain treated leather waste water and secondary precipitation mud.

The invention discloses a method for treating acidic dye printing and dyeing wastewater, which belongs to the field of wastewater treatment. The method comprises the steps of (1) filtering collected acidic printing and dyeing wastewater through a screen, then enabling the acidic printing and dyeing wastewater to enter a regulation tank, and using alkali waste to regulate the pH value of the acidic printing and dyeing wastewater to be 6.0-8.0; (2) feeding anionic surfactants into the regulation tank, and performing aeration decoloring treatment through a micro-nano aeration device; (3) enabling wastewater after aeration decoloring treatment to flowing through a sepiolite device of immobilized catalysts from bottom to top, wherein chemical oxygen demand (COD) in processed outlet water is lower than 100mg/L, the chromaticity is lower than 40mg/L, and the COD and the chromaticity both reach level 1 emission standards in Discharge standard of water pollutant for dyeing and finishing of textile industry. By means of combination of the anionic surfactants and the micro-nano aeration device, the method performs the aeration decoloring treatment on the acidic dye printing and dyeing wastewater, and absorption-catalysis is performed through the sepiolite device of the immobilized catalysts to further reduce the COD content in the wastewater. The method has the advantages of being simple in process flow, small in floor area, remarkable in effect of treatment on the COD and the chromaticity in the acidic dye printing and dyeing wastewater, and the like.

The invention discloses a treatment method of anthraquinone dye waste acid. The treatment method comprises the following steps: preparing resin balls and carrying out sulfonation modification; washingwith ammonia water to be neutral, filling a resin column with the adsorption resin balls, performing adsorption decolorization on the filtered anthraquinone dye waste acid through an adsorption column, adding potassium permanganate into the adsorption decolorized waste acid, filtering and separating to obtain a colorless sulfuric acid solution, desorbing the resin by adopting a desorbing agent, and recycling the desorbed resin to the step S2. According to the invention, a recovery process of combining specific adsorption resin with adsorption treatment and deep oxidation treatment is adopted;according to the method, the anthraquinone dye waste acid is efficiently recycled, the recovery rate of sulfuric acid can be close to about 90%, the removal rate of the COD content of the waste acidcan reach 99% or above, and the method can be used for treating the anthraquinone sulfate waste acid with the COD content of 5,000 ppm to 20,000 ppm.

The invention discloses an enzyme preparation which is characterized by being a compound enzyme preparation with a pH value ranging from 6 to 10 and comprising 3-50g/L compound refining enzyme, 0.2-20g/L amylase and 1-100g/L emulsifiable penetrant. The application of the enzyme preparation can replace the traditional desizing and scouring processes. The invention can overcome the disadvantages of complicated procedures, high steam and electricity consumption and large sewage discharge amount in the pretreatment process of the traditional textile, can reduce the damage to the textile and the pretreatment difficulty of the cotton blended/mixed texture, decreases energy consumption and sewage, and lowers the COD (Chemical Oxygen Demand) content in the sewage.