51results about How to "High chroma removal rate" patented technology

The invention discloses a composite flocculant and a preparation method and application thereof. The flocculant is prepared from rare-earth carbonate, sodium silicate and ferric sulfate/aluminum sulfate serving as raw materials by a composite copolymerization method. The effect of the composite flocculant of the invention is superior to that of the conventional polymeric ferric/aluminum silicate sulfate; the chroma removal rate of wastewater reaches over 90 percent; the COD Cr removal rate reaches over 65 percent; the removal rate of total phosphorus reaches over 88 percent; and the expense of a wastewater treatment medicament is reduced by 10 to 20 percent compared with PASS. The composite flocculant has rapid, large and solid alumen ustum, reduces the use amount of a single dye wastewater coagulating agent by over one half compared with PAC and by over 20 percent compared with PASS, improves the chroma removal rate of the wastewater by about 10 percent, has low processing cost, and improves the processing effect.

The invention relates to the field of wastewater treatment, in particular to a catalytic particle electrode used for synchronously removing refractory organics and ammonia nitrogen from wastewater and a preparation method and application thereof. The electrode comprises shell activated carbon and metal components loaded on the shell activated carbon, wherein the particle size of the shell activated carbon is 1mm-5 mm, and the content of the metal components is 0.8wt%-2.5wt% the total mass of the activated carbon. Packing of the catalytic particle electrode has the advantages of being high in catalytic activity, low in price, easy to obtain, simple in preparation, high in COD and ammonia nitrogen degradation and removal efficiency, high in produced water mineralization degree, low in unit COD energy consumption and capable of being used continuously. Accordingly, the electrode is suitable for treatment of wastewater which is difficult to degrade biologically and contains high-concentration organic pollutants and high ammonia nitrogen.

The invention discloses a printing and dyeing wastewater treatment method which comprises the following steps of: firstly mixing the printing and dyeing wastewater with domestic sewage; stirring at a certain pH value; and mixing intrinsic iron irons, magnesium ions, calcium ions and hydroxides of magnesium ions in the wastewater and the components such as suspended particles and the like in the domestic sewage to form a composite flocculating body with a synergistic effect. The composite flocculating body removes chromaticity in the printing and dyeing wastewater through the effects such as electrostatic adsorption, adhesion, bridging, sweeping and the like, and the domestic sewage is purified at the same time. The method disclosed by the invention is applicable to water-soluble and non-water soluble single kind or more kinds of mixed wastewater, and can be matched with a biological method or other physical and chemical methods for further treatment. The method has the characteristics of high decoloration degree, remarkable reduction of COD (chemical oxygen demand), suspended solids and total phosphorus and nitrogen, short treatment flow, simplicity in operation and management, only need for acid-base agents, low equipment investment and operation cost, no need of changing the original treatment facilities, wide application range, convenience in popularization and application and the like.

The invention discloses a preparation method of a perovskite type photocatalyst. The method comprises the following steps of: (1) taking barium salt, strontium salt, cobalt salt, ferric salt and citric acid, adding distilled water to mix and dissolve, sealing and heating to be at 90-100 DEG C, stirring at a constant temperature for 3-4h, releasing the sealing and heating continuously until the water is evaporated to form colloid, drying the colloid for 18-22h, holding the temperature at 110-130 DEG C; and (2) taking out a dried sample for calcination and grinding the calcined sample to obtain the black powder-shaped BaxSSr1-xFe0.5Co0.5O3-delta photocatalyst. The invention also discloses a perovskite type photocatalyst product prepared according to the preparation method; the value range of the x in the prepared BaxSSr1-xFe0.5Co0.5O3-delta photocatalyst is 0-1. Perovskite type oxides prepared through using the preparation method have excellent photocatalytic degradation activity, the chroma removal rate after the reaction is high, the degradation rate for methyl orange with appointed concentration is above 95% and the introduction rate for appointed Congo red dyes is up to 93%.

A tanning wastewater recycling device and method based on electrochemistry and ultrafiltration relate to the treatment of one kind of wastewater. The invention provides a tanning wastewater recycling device and method based on electrochemistry and ultrafiltration, wherein the device and method have high CODCr removal rate (chemical oxygen demand), low chemical agent consumption, low sludge yield, thorough treatment and high water reuse rate. The device is provided with a grid filter, an adjusting pool, a hydraulic sizer, a nanocatalysis electrolysis flocculating machine, a sedimentation tank, an air floatation device, a biochemical tank, a secondary sedimentation tank, a secondary nanocatalysis electrolysis flocculating machine, a filter and a filter press. The method comprises the steps of flocculation and filtration, nanocatalysis electrolysis, sedimentation, air floatation, biochemical treatment, secondary catalysis electrolysis, filtration and ultrafiltration.

The invention discloses a method for producing a high-efficiency purifying agent magnesium ferrous sulfate from titanium dioxide waste acid by using a sulphuric acid method, aims to overcome the defect of the commonly used purifying agent at present, solves the problem of waste acid pollution in a titanium dioxide plant and provides a method for producing the purifying agent. The method comprises the following steps: putting mother liquor into a reaction pool; adding magnesia with the MgO content of more than or equal to 85 percent into the mother liquor; mixing with a stirrer; controlling the adding amount of the magnesia by using a method of measuring the specific gravity of mixed liquor with a Baume hydrometer; controlling the adding amount of waste sulphuric acid by using a method of detecting the pH value of the mixed liquor; controlling the reaction temperature not to exceed 95 DEG C; performing pressure filtration on a reacted mixed liquor with a pressure filter after the reaction is performed for 1.5 to 2.5 hours; delivering filtrate to a cooling bath for initial cooling and then delivering the filtrate to a cooling tank with a pump; further cooling the filtrate through stirring; discharging when the temperature is reduced to 10 to 30 DEG C; putting the cooled filtrate to a crystallizing pool to crystallize and precipitate naturally; and drying a precipitated product to obtain a granular product.

The invention relates to a method for simultaneously removing insoluble organic matter, total cyanogen and total nitrogen in wastewater of an industrial park. The method comprises the following steps: wastewater enters a high-efficiency coagulated decyanation reactor to remove total cyanogen in the wastewater removed from the coagulated decyanation reaction; effluent from the coagulating reaction enters an aeration biofilter, ammonia and nitrogen in the wastewater is oxidized into nitrate nitrogen or nitrite nitrogen, and partial organic matters are oxidized and removed; effluent from the aeration biofilter flows into a denitrification filter tank, and nitrate nitrogen and nitrite nitrogen in the wastewater are denitrified into nitrogen and removed; effluent from the denitrification filter tank is filtered in a V-shaped filter tank and then enters an ozone catalytic oxidation tank, and insoluble organic matters are oxidized into small-molecular organic matters or mineralized in the presence of a catalyst. The method can be used for oxidizing and degrading organic matters while removing total cyanogen and total nitrogen in the wastewater to ensure that treated effluent can be emitted in standard, thus having an excellent market prospect.

The invention discloses a coagulant for treating polysulfonate slurry sewage. The coagulant for treating the polysulfonate slurry sewage provided by the invention comprises calcium hydroxide or calcium oxide, and ferric sulfate or ferrous sulfate. The coagulant for treating the polysulfonate slurry sewage provided by the invention is used for treating the sewage containing polysulfonate slurry; the CODCr (Chemical Oxygen Demand) of the treated sewage is reduced by 70-85 percent; the chrominance is determined by using a dilution multiple method and can be reduced to 180-220; the subsequent physicochemical treatment and biochemical treatment can more easily reach standards; and the treatment cost is low.

The invention discloses a preparation method of a novel inorganic polymeric flocculant, and belongs to the environmental protection field. The preparation method comprises the following steps: 1, transferring a certain amount of a sulfuric acid solution into a beaker at normal temperature under normal pressure, titrating by using 0.5mol/L of a sodium silicate solution, measuring the pH value of the solution by using pH meter while titrating, and stopping the dropwise addition when the pH value is 3.5-4.5; 2, continuously carrying out stirring polymerization for 1.0-2.0h, and allowing the polymerized solution to stand for ageing until the solution is pale blue; 3, sequentially adding a certain amount of 0.5mol/L of aluminum sulfate, 0.5mol/L of iron sulfate and 0.1mol/L of sodium pyroborate into the obtained aged polysilicic acid; and 4, adjusting the pH value to 2-3, fully stirring by using a magnetic stirrer for 1.5h, and allowing the fully stirred solution to stand in a refrigerating chamber with the temperature of 0-4DEG C for slaking for 24-28h to obtain the boron-containing polyaluminum ferric silicate flocculant.

The invention relates to a coagulation process in water treatment purification technology, wherein metal salt flocculating agent and aquadrate starch are mixed in the form of water solution, and are charged into the water to be processed, the aquadrate, dried maize starch and water solution are mixed for mixing reaction for 3-4 hours under the temperature condition of 90-100 deg. C. The invention realizes fine water purification effect and less influence from water temperature.

The invention discloses a process and equipment for efficiently treating wheat straw pulp intermediate wastewater by an alkaline method. The process comprises the following four steps: carrying out pretreatment, pre-oxidation, aerobic biological treatment and coagulating sedimentation on wastewater so that effluent reaching standard is discharged. According to the invention, a combined process comprising pretreatment, Fenton pre-oxidation, aerobic biological treatment and coagulating sedimentation is adopted, the treatment equipment has simple structure, high efficiency and good treatment effect, and is stable to operate; total CODCr (chemical oxygen demand Cr) removal rate is up to 95-97%, and total chroma removal rate reaches 95-99%; cost is low, thus energy is saved by above 40%; and the yield of sludge is less, thereby saving sludge treatment cost. By the treatment with the process and equipment, the final effluent can stably reach the requirement of 'water pollutant emission standard in pulp-producing paper-making industry (GB3544-2008)'.

The invention discloses a membrane separation concentrated-brine utilization technology, and in particular relates to a method for separating high-salt-containing concentrated water by a light-assisted catalytic membrane for decoloration and improving salt quality. The method adopts a fixed-bed catalyst, a plurality of oxidants are added, a processing membrane is used to separate the high-salt-containing concentrated water under light source excitation conditions, organic matter with a larger molecular structure is catalyzed the oxidized, and organic matter with a smaller molecular structure and no color or weak coloring ability is generated, so that chromaticity of the brine is reduced, and a part of COD is removed; and a mother liquor produced after the brine is separated is treated by adopting an enhancing catalytic system, so that quality of produced salt and stability of an evaporation system are improved, and zero emission is realized. The method provided by the invention has theadvantages that no new impurity oxidant is introduced, the problem of difficulty in catalyst recovery does not exist, the chromaticity of the obtained salt and the stability of the evaporation systemare ensured, and wastewater recycling and zero emission are truly realized.

The invention discloses a preparing method for a dyeing waste water treating agent. The preparing method includes the following steps that bentonite, ferric sulfate, alums, aluminum sulfate, activated carbon, basic aluminum chloride, ferrous sulfate and nickel nitrate are taken, mixed and smashed into fine powder; chitosan is added into certain amount of pure water and dissolved through heating, sodium polyacrylate and starch are added and stirred, and an intermediate material is obtained after heat preservation; the fine powder and the intermediate material are mixed, and polysorbate is added and stirred to obtain the dyeing waste water treating agent. Compared with the prior art, the preparing method is simple in technology and low in cost, the chroma removing rate, the turbidity removing rate and the COCcr removing rate of dyeing waste water treated by the obtained dyeing waste water treating agent can be substantially increased, and the dyeing waste water treating agent is excellent in performance.

The invention discloses a sewage treating agent, which is prepared from the following ingredients in parts by weight: 10 parts of sodium polyacrylate, 5-25 parts of starch, 30-50 parts of bentonite, 5-15 parts of ferric sulfate, 5-15 parts of white alum, 0.5-1.5 parts of aluminum sulfate, 1-9 parts of activated carbon, 1-7 parts of basic aluminium oxide, 0.5-1.5 parts of ferrous sulfate, 0.2-0.8 part of nickel nitrate, 10-20 parts of chitosan and 0.02-0.08 parts of polysorbate. Compared with the prior art, the sewage treating agent has the advantages of simple technology and low cost, the chroma removing rate, the turbidity removal rate and the COCrr removal rate of printing and dyeing sewage can be obviously improved, and performance is excellent.

The invention discloses a combination device for physicochemical treatment of black liquid. The combination device comprises chemical storage tanks, chemical feed tanks, an oxygenolysis bin, a coagulation polycondensation bin, a dehydration separator bin, a turning slag extractor bin and a clear water recycle bin all integrated. The oxygenolysis bin is connected with the coagulation polycondensation bin, a set of chemical storage tank and chemical feed tank are arranged at upper part, the oxygenolysis bin and coagulation polycondensation bin are be provided with a separating plates, with the lower parts being communicated, each bin is divided into two chambers, each chamber is provided with a set of stirring device, and the liquid is fed and discharged at the upper part. The coagulation polycondensation bin is connected with the dehydration separator bin, which is provided with a micro-filtering dehydrator at the upper part and with a water tank water pipe communicating with the clear water recycle bin at the lower part, the upper dehydrator communicates with the turning slag extractor bin, which is provided with a moving board for sludge discharge and connected with the clear water recycle bin, and a clear water bin is provided with a sloped tube sediment layer for sedimentation to obtain clear water and discharge into a water storage tank. The combination device adopts a black liquid lifting pump and chemical liquid, to rapidly decompose nano-lignin and perform polycondensation to obtain bulk-shaped solid substance with no viscosity, high dehydration speed and efficiency, chemical oxygen consumption removal up to 95% and chroma removal up to 98%. The combination device has reasonable design, high device integration level, small floor area, energy saving and environment friendliness, and can be matched with alkali recovery process to trap diluted black liquid for physicochemical treatment, and realize zero discharge of black liquid.

The invention discloses a composite material for printing and dyeing wastewater treatment. An active component of the composite material is nanometer titanium oxide doped with zinc oxide and cerium oxide; a carrier of the composite material comprises surface-modified fly ash and aluminum oxide; the molar ratio of the zinc oxide to the titanium oxide is (1-10):1; the molar ratio of the cerium oxideto the titanium oxide is (0.2-5):1; the mass ratio of the surface-modified fly ash to the aluminum oxide is (1-10):1; in the composite material, the molar ratio of the active component to the carrieris (0.1-5):1. The composite material significantly improves the catalytic efficiency of a photooxidation catalyst and has relatively strong organic matter adsorbing capacity; the prepared composite material has good mechanical properties, can be repeatedly recycled for use, and has the service life being much longer than that of the composite material in the prior art.

The invention discloses a cotton pulp wastewater treatment integration technology. Cotton pulp wastewater subjected to biochemical treatment is placed in a catalytic oxidation tower, and meanwhile an oxidizing agent is pumped into the catalytic oxidation tower through an oxidizing agent adding box; a catalyst is arranged at the inner bottom of the catalyst oxidation tower; air is blown in through an air blower while the wastewater enters the tower; the sewage treated by the catalytic oxidation tower enters a contact pond, and an efficient air diffusion system is arranged in the contact pond; water flowing out of the contact pond enters a flocculation and sedimentation pond; a flocculating agent is pumped into a flocculation pond body of the flocculation and sedimentation pond through a flocculating agent adding box, meanwhile a coagulant aid is pumped into the flocculation pond body of the flocculation and sedimentation pond through a coagulant aid adding box, a stirrer and a water pump in the flocculation pond body of the flocculation and sedimentation pond are linked, and water flowing out of the flocculation and sedimentation pond can meet standards and be discharged. The COD and the chromaticity removal rate are high, the operation process is stable and reliable, operation is easy, the treated sewage can be reused, and economic benefits are considerable.

The invention discloses an aluminum salt type microbial composite flocculant for treating shale gas drilling wastewater, and belongs to the field of environmental wastewater treatment. A preparation process of the composite flocculant comprises the following specific steps: adding PDMDAAC (dimethyl diallyl ammonium chloride homopolymer) into an aluminum sulfate solution according to a mass ratio of (30:1)-(35:1) to obtain a PAS-PDM solution; then adding polysaccharide extracted from mycobacteria into the mixed solution, with the dosage being 1%; and stirring the mixture to obtain the stable aluminum salt microbial composite flocculant. In the wastewater treatment process, the coagulation effect of the prepared aluminum salt microbial flocculant is better than that of a conventional coagulant under the condition that the addition amounts are similar, and the COD removal rate of the aluminum salt microbial flocculant is increased by 24.10%-12.60%; and the chroma removal rate is increasedby 50%-10%.

The invention belongs to the technical field of wastewater treatment, and provides an advanced treatment process for degumming wastewater of ramie. The method comprises the following steps: (1) adjusting a pH value of scouring wastewater, then adding biological enzymes into the scouring wastewater, carrying out a reaction, wherein the biological enzymes comprise pectinase, hemicellulase and xylanase, and carrying out filtering so as to obtain a first treated solution; (2) adding ferrous salt and hydrogen peroxide into the first treated solution for treatment, and carrying out filtering so as to obtain a second treated solution; (3) adding quicklime into the second treated solution, and carrying out stirring and standing so as to obtain a supernatant; and (4) mixing the supernatant with filtered wastewater, adding a flocculating agent, carrying out flocculation, then carrying out filtering, successively allowing obtained filtrate to enter a hydrolysis acidification pool, an anaerobic pool and an aerobic pool for treatment, then carrying out adsorption with an adsorbent, and carrying out filtering so as to obtain treated water. The process provided by the invention can significantlyreduce the content of pollutants in the degumming wastewater of the ramie, especially the scouring wastewater, so the degumming wastewater of the ramie can reach national first-level discharge standards after treatment.