84results about How to "Good flocculation and sedimentation effect" patented technology

Disclosed is a technique for processing organic waste water, including the following steps: (a) preprocession: pour the waste water into the micro electrolytic reducing pool where the iron-carbon micro electrolytic reaction occurs under the agtatering effect, add hydrogen peroxide into it to have. Fento oxidation, then the water enters into coagulation pool into which add NaOH and PAM; (b) anaerobe hydrolysis oxidation procession: power the organic waste water preprocessed into high effective anaerobe hydrolysis oxidation pool in which add into the TCBS reactor in which add into high effective compound microbe, making the water mix with the flowing-back mud with high density after denitrification. The invention can increase the biochemical of organic waste water, strengthen its resistance to poison and impact as well as the biological denitrification funcation, and making the waste water reach the national environment protection requirement by reducing the polluting load by steps.

The invention relates to a method for treating organic amine industrial waste water by Fenton-like oxidation-flocculation. According to the method, the pH value of the waste water is adjusted to 3-5, and the temperature of the waste water is adjusted to 20-40 DEG C; a catalyst is added, wherein active ingredients of the catalyst comprise: ferrous sulfate, anhydrous cupric sulphate and manganese sulfate monohydrate, wherein the mass ratio of the ferrous sulfate to the anhydrous cupric sulphate to the manganese sulfate monohydrate is (5-10):1:(0-5); H2O2 (30%) is added, and the oxidation reaction time is 4 hours; after completing the oxidation reaction, sodium hydroxide is added to adjust the pH value of the waste water to 8-10; adding a chemical coagulant and an organic polymer flocculant, such that partial suspended solids, colloids and partial organic amines in the waste water are concurrently coagulated. According to the present invention, the Fenton-like oxidation-flocculation is adopted as the pretreatment for the organic amine waste water, such that the organic amines in the waste water can be effectively removed, the poison and the impact on microorganisms due to the high concentration organic amines in the wastewater can be reduced, the subsequent biological treatment is easily performed for the sewage.

The invention relates to a device and a method for integrally processing garbage percolate, wherein the device comprises a denitrification mechanism, a polymerizing reaction tank, a sloping plate / pipe sedimentation tank, a biochar filter bed, an SMBR reactor and a medicine dissolving and dispensing mechanism, wherein the medicine dissolving and dispensing mechanism comprises three parallel medicine dissolving tanks including an alkali liquor tank, a flocculation liquid medicine tank and a flocculation aid liquid medicine tank; the three medicine dissolving tanks are respectively communicated with an alkali liquor medicine adding hole on a liquid inlet pipe of a stripping tower and a flocculation medicine adding hole and a flocculation aid medicine adding hole of pipelines communicated with a denitrification settling water tank and the polymerizing reaction tank. The treatment method comprises ammonia nitrogen stripping, coagulating sedimentation, biochar filter bed treatment, SMBR reactor treatment, nanofiltration and / or reverse osmosis treatment. The device and the method consist of a high-efficiency ammonia nitrogen stripping tower, whirl grid coagulation, sloping plate (pipe) setting, the biochar filter bed and the SMBR reactor, integrates the advantages of a garbage percolate treatment process and solves the problem of difficult treatment and high expense of the garbage percolate. The high-efficiency ammonia nitrogen stripping tower has high utilization rate on gases, a new gas distribution structure improves the energy efficiency, and the invention has the advantages of reducing the occupied area and reducing the operation expense.

The invention discloses a powdery high-whiteness polyaluminium chloride complex and a preparation method thereof. The mass content of alumina is 28 to 30 percent, the mass content of acrylic amide-dimethyldiallylammoniumchloride copolymer is 1 to 5 percent, the alkalinity is 55 to 85 percent, the whiteness is 80 to 90 percent, the mass content of water-insoluble substance is 0.5 to 1.5 percent, and the mass content of iron ions is less than 0.01 percent. When the complex is used for papermaking white water treatment, the complex controls fin fiber, filler and gooey and the like in the papermaking white water with small using amount and low using cost; when the complex is used for treating the papermaking white water, the sediment floccule is recycled for papermaking and the adding amount of the sediment floccule in papermaking reaches 5 percent, the whiteness of the formed paper is still not reduced; when the complex is added into the papermaking pulp, the complex has strong charge neutralization capability for pulp fiber, and can obviously improve the retention rate of the fiber and the inorganic filler and reduce the turbidity of the papermaking white water; when the using amount of the complex reaches 3 percent, the whiteness of the formed paper is still not reduced; and when newspaper is manufactured by de-inking, bleaching and pulping waste paper and the white water is recycled, the complex can improve the whiteness of the formed paper.

The invention provides an advanced treatment method for coking wastewater. The steps of electrolysis, flocculation, advanced treatment, water draining and the like are used for treating the coking wastewater after being treated through a biological method. Waste water is heavy in color after being treated through a traditional biological treatment method, the COD concentration cannot meet the emission standard, and a small amount of phenols and cyanide are remained. The method effectively solves the boundedness of treating the coking wastewater through the biological method, the water quality of discharged water is stable, the water quality standard of reuse of recycled water is met, namely the water quality of urban wastewater reclamation and reuse and urban miscellaneous water (GB / T18920-2002), and the recycling of water resources is achieved.

The invention discloses a preparation process of a double aqueous phase decoloring flocculant emulsion. The process comprises the following steps: first, adding dicyandiamide and formalin with mass concentration of 37-40% into a container, heating to 75-80 DEG C, maintaining constant temperature of water bath, and stirring and reacting for 0.8-1.5 hours; adding a modifier ammonium chloride and a catalyst aluminum trichloride, adjusting and maintaining the temperature of water bath at 60-70 DEG C, and reacting for 1.2-1.4 hours to obtain a dicyandiamide formaldehyde polycondensate; and with dicyandiamide formaldehyde polycondensate aqueous liquor as a dispersing medium, adding acrylamide or then adding acrylic acid, a cationic monomer and a chain transfer agent isopropanol, stirring and dissolving to obtain liquor with a homogeneous phase, introducing nitrogen and removing oxygen for 10-20 minutes, then adding an initiator, and reacting for 6-16 hours at the water bath temperature of 30-50 DEG C to obtain the double aqueous phase decoloring flocculant emulsion. The preparation process disclosed by the invention is simple in equipment, and the decoloring rate of the prepared decoloring flocculant used for simulating dye wastewater treatment reaches over 93%.

The invention relates to a preparation method of a chelating dispersant. The preparation method comprises steps as follows: a, 10 parts of maleimide and 12 parts of acrylamide are dissolved with 65 parts of deionized water, 0.2 parts of sodium persulfate is dissolved with 30 parts of deionized water, and a solution is formed for later use; b, 20 parts of dodecyl polyoxyethylene ether, 15 parts of maleic anhydride sodium monoester, 15 parts of diallylamine and 234 parts of deionized water are added to a reactor, dissolved and heated to 70 DEG C; c, 1 / 3 of a maleimide and maleicamide aqueous solution in volume and 1 / 4 of a sodium persulfate water solution in volume are added to a reaction kettle and kept at the temperature for 30 min; d, the remaining maleimide and maleicamide aqueous solution, the remaining sodium persulfate water solution and 20 parts of acrylic acid are dropwise added within 2 h and kept at 80 DEC G, and the mixture reacts for 2 h; e, the temperature of the reactor is reduced to 30 DEG C, 8 parts of sodium hydroxide are added firstly, 14 parts of carbon disulfide are added after dissolution, the mixture reacts for 3 h and is filtered, and the chelating dispersant is obtained.

The invention discloses a method for processing monohydrallite ore washing gangue. The method includes: conveying first monohydrallite ore washing gangue to an efficient thickener so as to perform first concentration sedimentation on the first monohydrallite ore washing gangue, and first concentration underflow can be obtained; the first concentration underflow can be collected and mixed with second monohydrallite ore washing gangue to be conveyed to the efficient thickener, second concentration sediment can be performed, and second concentration underflow can be obtained; the second concentration underflow can be conveyed to a filter press for filter pressing, and solid-liquid separation can be obtained. The method for processing monohydrallite ore washing gangue is easy and convenient, fast, efficient and less in energy consumption, does not need to add additional devices compared with a conventional method, requires low cost, is good in solid-liquid separation effect, can fully recycle water in the gangue, accordingly can effectively save water resources and avoid environment pollution, and is particularly suitable for processing the monohydrallite ore washing gangue which is tiny in granule, large in viscosity, not apt to settle and difficult to process by adopting a conventional method.

The invention discloses a polysilicic acid aluminum sulfate flocculating agent, a preparation method and application, and belongs to the technical field of purification of waste water in an oil and gas field. The preparation method for the polysilicic acid aluminum sulfate flocculating agent comprises the steps that 1) sodium silicate is dissolved in water to obtain a solution with the concentration of 0.2-0.5 mol / L, the p H value of the solution is 2.1-5, and the solution is stirred for polymerization for 10-30 minutes at the indoor temperature to obtain polysilicic acid; 2) according to molar ratio, aluminum sulfate and ferrous sulfate are added, (Al+Fe) / Sl=0.5-2.2, Al / Fe=0.5-2.2, the mixture is stirred for polymerization for 10-30 minutes at the indoor temperature and subjected to standing for curing for 20-28 hours, and the polysilicic acid aluminum sulfate flocculating agent is obtained. The flocculating agent is specially applied to waste liquid treatment for drilling wells in the oil and gas field, the flocculent precipitate effect is good, single dosage is added, the addition amount is small, the COD removing rate is high, and after treatment, the COD index of waste water is below the national emission standard.

The invention discloses a novel physicochemical coagulation method sewage treatment device, which comprises a shell, wherein the shell is of a hollow structure, and a water inlet is formed in the upper side wall of the shell; a driving motor is arranged on the upper side wall of the shell, and a mounting block is laterally arranged on the inner wall of the shell; the mounting block is of a hollowstructure, and the output shaft of the driving motor penetrates through the shell and the side wall of the mounting block and is connected with a first rotating shaft; a downward-opening groove is formed in the lower side wall of the mounting block, and one side, away from the driving motor, of the first rotating shaft is laterally provided with a first gear; the first gear is positioned in the groove, and a tooth ring is arranged on the side wall of the groove; a first rotating disc is also sleeved on the side wall of the first rotating shaft. The novel physicochemical coagulation method sewage treatment device provided by the invention has the advantages of simple structure and convenient operation, can fully mix sewage and a flocculant, thereby achieving the ideal flocculation and sedimentation effect, and having sufficient sewage treatment and relatively high efficiency.

The invention discloses an energy-saving sewage precipitation device which comprises a precipitation tank fixedly connected with a base; a conical cavity is formed in the precipitation tank, and a water inlet pipe is fixedly connected with the left side of the precipitation tank; a central shaft is arranged in a central axis position of the conical cavity, and a stirring plate is fixedly connectedwith the central shaft; and a spray pipe is arranged above the stirring plate, a liquid inlet pipe is communicated above the central shaft through a rotating joint, and a liquid storage tank is communicated with the liquid inlet pipe. The energy-saving sewage precipitation device disclosed by the invention has the benefits that as the conical cavity and the water inlet pipe tangentially communicated with the conical cavity are arranged, water flow enters the conical cavity to form rotational flow so as to drive the stirring plate to rotate, accelerate the dispersion of a flocculating agent, improve the mixing uniformity of the flocculating agent and improve flocculation and precipitation effects; and through arranging a solar-powered drive motor, the rotating speed of the stirring plate is further improved, the mixing effect of the flocculating agent is improved, and the flocculation and precipitation effects are better while the energy conservation is achieved.

The invention provides a production method of a polymeric chelating agent capable of being used for removing various heavy metal ions in wastewater. The method comprises the steps of carbon disulfide elevated tank feeding, synthesis kettle feeding, chilled brine introduction, carbon disulfide dropwise adding and rotating speed adjustment. In the synthesis kettle feeding, the mole ratio of polyethyleneimine to NaOH is 1:0.6-0.8, and the mole ratio of polyethyleneimine to deionized water is 1:15-26. The synthesized chelating agent is brownish red transparent liquid, the density is 1.08-1.13 g / ml at 25 DEG C, the pH value (a 10% water solution) is 10.6-11.4, the viscosity is 82-90 mPa.s at 25 DEG C, and the effect of removing heavy metal ions in wastewater is good. The production method has the advantages that the reaction time is short, the reaction temperature is low, energy consumption is low, raw material matching is reasonable, the reaction is sufficient, and side reactions are significantly reduced.

The invention relates to a treatment agent for papermaking wastewater and a preparation method thereof. The treatment agent for papermaking wastewater comprises the following components in parts by weight: 10-20 parts of a flocculating agent, 3-8 parts of a surfactant, 15-25 parts of activated carbon, 7-15 parts of bentonite and 5-10 parts of a carbon nanotube / polyacrylamide composite material. Apreparation method of the carbon nanotube / polyacrylamide composite material comprises the following steps: dispersing functional carbon nanotubes in an organic solvent, adding polymerizable glycidyl ether, acrylamide and an initiator, introducing nitrogen to replace air in a bottle, carrying out a stirring reaction in an oil-bath pan at 60-70 DEG C for 2-3 h, carrying out reduced-pressure distillation to remove the solvent after the reaction ends, drying a solid in vacuum, and conducting grinding to obtain the carbon nanotube / polyacrylamide composite material. The treatment agent for papermaking wastewater is simple in treatment process, BOD and COD in water can be effectively reduced, treatment time is short, treatment effect is good, and the quality of treated water can reach a dischargestandard.

The invention provides a production method of a macromolecular chelating agent for treating heavy metal ions in wastewater. The production method comprises the steps of adding a material into a carbon disulfide overhead tank, adding a material into a synthesis kettle, feeding chilled salt water, dropwise adding carbon disulfide and adjusting the rotating speed. In the step of adding the material into the synthesis kettle, the material ratio is that the mole ratio of polyethyleneimine to NaOH is 1 to 0.6-0.8, and the mole ratio of polyethyleneimine to deionized water is 1 to 15-26. The chelating agent synthesized through the preparation method is brownish red transparent liquid, has the density of 1.08 to 1.13 g / ml at 25 DEG C, the pH value (in 10 percent of an aqueous solution) is 10.6 to 11.4 and the viscosity of 82 to 90 mPa.s at 25 DEG C, and is good in clearing effect on the heavy metal ions in the wastewater. The preparation method further has the advantages of short reaction time, low reaction temperature, low energy consumption, reasonable raw material proportioning, full reaction and obvious reduction of side effects.

The invention relates to an animal husbandry sewage flocculating agent with natural ingredients. The animal husbandry sewage flocculating agent is prepared from, by weight, 3%-15% of chitosan, 10%-30% of moringa oleifera branch and trunk powder, 5%-20% of moringa oleifera seed powder, 5%-30% of potato skin powder and the balance zeolite powder. Chitosan, moringa oleifera branches and trunks, moringa oleifera seeds and zeolite powder have the water purifying effect, organic matter ingredients of a flocculating system are enhanced through potato skin, the flocculating agent can react with animal husbandry sewage with complex ingredients to generate large-particle flocculating precipitate, flocculating efficiency is improved, the flocculating precipitation effect is remarkable, the water purifying effect is remarkable, the flocculating precipitate can be degraded, cost is low, and no secondary pollution is caused.

The invention discloses a water purifying plant for removing brominated trihalomethane and brominated haloacetic acids, which comprises a filter drum and a filter element, wherein the filter element comprises a zeolum layer, a diatomite layer and an active carbon layer, and the diatomite layer is arranged between the zeolum layer and the active carbon layer. Compared with the prior art, the waterpurifying plant for removing brominated trihalomethane and brominated haloacetic acids comprises the filter drum and the filter element, wherein the filter element comprises the zeolum layer, the diatomite layer and the active carbon layer, and the diatomite layer is arranged between the zeolum layer and the active carbon layer, the three layers can have better flocculation and precipitation function, filtration function and synergetic action, and can effectively remove the brominated trihalomethane and the brominated haloacetic acids in water without producing harmful substances of bromate orsilver and the like; the removal rate of the brominated trihalomethane and the brominated haloacetic acids in water can reach up to over 95 percent.

The invention discloses a treatment method of waste brine containing vanadium, chromium and titanium. During treatment, a ferric salt is firstly added into the wastewater, then vanadium, chromium, titanium and the like in the solution are precipitated by adjusting the pH value of the solution, and finally the wastewater is removed through filtration. According to the method, ferric salt is added into the waste brine, the content of vanadium, chromium and titanium in the wastewater can be remarkably reduced through precipitation reaction and flocculation, and the content of titanium, vanadium and chromium in the purified brine can be lower than 20 ppb, so that the purified brine can be used for ionic membrane caustic soda production, and the waste brine produced by production enterprises ofvanadium, titanium and the like is fully utilized; green environmental protection is achieved.

The invention relates to the field of chemical industries, in particular to an antifreezing type dust aggregation agent and application thereof. The dust aggregation agent is prepared from the following components in parts by weight: 1 to 5 parts of lauryl alcohol polyoxyethylene ether sulfate, 4 to 15 parts of polyoxyethylene lauryl ether, 2 to 8 parts of lauryl sulfate, 4 to 15 parts of iso-alcohol polyether, 2 to 7 parts of a wetting agent and 65 to 75 parts of water. The dust aggregation agent provided by the invention is prepared by the economical and environment-friendly raw materials; awhole preparation process is simple and easy to operate, and has no pollution to the environment. In addition, the dust aggregation agent is mixed with compressed air and then a mixture is ejected from a nozzle at high speed to form a high-speed atomization jet flow, so that surface tension of water droplets is reduced, the binding ability between water mist and dust is greatly improved, and thedust removal ratio reaches 95 percent or above; besides, no stagnant water is formed on the ground after mist spray. Moreover, the dust aggregation agent provided in the application has good stabilityat low temperature, and still has good effects of dust aggregation and flocculate sedimentation at lower temperature.

The invention discloses a method for improving settling property of activated sludge. The method comprises steps as follows: wastewater containing the activated sludge is pretreated; activated sludge solids with good settling property are separated through gravity settling; the activated sludge with poor settling property is conveyed to an aeration tank for aeration treatment, and an oxygen bearing solid-liquid mixture is obtained; the oxygen bearing solid-liquid mixture is subjected to gravitational separation by a hydraulic cyclone, and coarse particle substances, a concentrated liquid and liquid-solid suspended matter are obtained; activated sludge with the improved settling property is obtained through gravity settling of the coarse particle substances and the concentrated liquid; the activated sludge with the improved settling property and the activated sludge solids with the good settling property are combined. According to the method, BOD (biochemical oxygen demand) load of the separated activated sludge with the poor settling property is improved by the aid of the aeration tank, meanwhile, excessive organic matter and nitrogen are consumed through aerobic bacteria, and the sludge is prevented from anaerobic fermentation; finally, colloidal components and tiny particles capable of causing membrane pollution and inducing scaling of a membrane air diffuser are removed through gravitational separation, and the settling property of the activated sludge is effectively improved; the process is simple, and the method has quite broad industrial application value.

The present invention relates to filter cloth capable of forming micro-electrolysis. The filter cloth comprises base cloth formed by weaving carbon fibers and at least one type of metal filaments, wherein filter holes are formed in the base cloth. The filter cloth is mainly used in the environment that the relative humidity is higher than 10% and the temperature is lower than 600 DEG C. By adopting the aforementioned technical scheme, the filter cloth can treat sewage and air, and is light in mass, small in size, low in power consumption and long in service life.

The invention belongs to the technical field of inorganic silicon production, and particularly relates to a treating method for silicon slag produced during production of liquid sodium silicate. The treating method comprises the following steps that filtered silicon slag is added into a solid-liquid separation device to be flushed with high-pressure flushing water, sodium silicate in the silicon slag is dissolved and flows out of the solid-liquid separation device along with insoluble colloidal granules and the flushing water, and quartz sand in the silicon slag is separated out; the separated-out quartz sand is flushed with water again and recycled after being centrifugally dewatered; and the flushing water containing the insoluble colloidal granules and the water flushing liquid obtained after the quartz sand is flushed are subjected to flocculation precipitation treatment, the insoluble colloidal granules in the water are flocculated to form large colloidal granules and settled, and the settled large colloidal granules are separated. Useful ingredients in the silicon slag are sufficiently recycled, the problem that environmental pollution and resource waste are caused due to the fact that the silicon slag is directly abandoned as solid waste is avoided, and the production cost is reduced.

The invention discloses a municipal sewage treatment device which comprises a mixing tank, a flocculation tank and a settling tank,wherein the mixing tank, the flocculation tank and the settling tankare integrally connected and communicated sequentially from front to back according to the technological process, a water inlet pipe is arranged at the front end of the mixing tank, a medical adding pipe is connected to the water inlet pipe, baffles are uniformly and vertically arranged in the mixing tank, a water dispersing pipe is arranged at the top end of the flocculation tank, a stirring mechanism is arranged in the flocculation tank, a water distributing hole is formed in the bottom wall of the right side of the flocculation tank and communicated with the settling tank, and a central pipe, a central pipe hopper, a spiral baffle, a collection hopper and a water outlet are arranged on the settling tank. According to the municipal sewage treatment device, the integrally connected mixingtank, the flocculation tank and the settling tank are arranged, so that the processed water quality and the volume load are improved greatly, the pollutant removal efficiency and the purifying capacity are high, at the same time, the equipment structure is compact, the occupied area is small, and the device is suitable for the small-scale sewage treatment site.

The invention relates to a method for processing 1,3-propanediol concentrated bacterial liquid. The method comprises the following steps: separating thalli in fermentation liquid through membrane filtration, wherein membrane filtration equipment can select and use fibrous membrane, ceramic membrane or stainless steel membrane; adding water into the concentrated bacterial liquid according to a volume ratio of 1:1 to 20 for dilution; at normal temperature, adding a compound medicament into the diluted bacterial liquid according to a volume ratio of 100:0.2 to 2, and adding an alkaline substance to regulate the pH value to 9-12, wherein the compound medicament is the aqueous solution of ferrous sulphate and polymer ferric sulfate, the mass of the ferrous sulphate is 10 to 30%, the mass of the polymer ferric sulfate is 10 to 30, and the balance is water; then adding one per mill polyacrylamide solution according to a volume ratio of 100:0.1-1; and settling for 5 to 30 min and filtering. The method has the advantages of simple process, easy operation, low treatment cost and good flocculation and settlement effect, which is applicable to the treatment of the production of 1,3-propanediol concentrated bacterial liquid by fermentation method.

The invention belongs to the technical field of removal, purification and entrapment of heavy metal ions in a water body, and in particular relates to an ethylenediamine-based heavy metal chelating agent and a preparation method thereof. The ethylenediamine-based heavy metal chelating agent is prepared by directly reacting ethylenediamine, carbon disulfide and solid alkali in absolute ethyl alcohol or a mixed solvent consisting of absolute ethyl alcohol and diethyl ether in a certain volume ratio. The method overcomes the defect of steric effect of polymer chains when the conventional polymeric chelating agent chelates the heavy metal ions, and also overcomes the defect that floccules have excessive negative charge to obstruct the further growth of the floccules because of mismatched space of chelation groups of small molecules with multiple functional groups. The product is solid powder, has high stability and is convenient to store and transport. The method has the advantages of simple synthetic process, mild reaction conditions, easy operation and control, high reaction speed, high efficiency, recyclable solvent, high utilization rate of raw materials, less discharge of three wastes, environmental-friendly technical process, conventional equipment and easy industrial production.

The invention relates to a synthesis method of cation modified gamma-polyglutamic acid and application thereof. The method comprises the following steps that (1) gamma-polyglutamic acid is added into a reaction kettle filled with distilled water; stirring is performed; (2) an etherifying agent of 3-chlorine-2-hydroxypropyl trimethyl ammonium chloride and NaOH are respectively dissolved into water to respectively obtain an etherifying agent solution and alkali liquor; a gamma-polyglutamic acid water solution in the step (1) is subjected to swelling; then, the etherifying agent solution is dripped, and then the NaOH solution is dripped; cooling, precipitation, refrigeration and drying are performed; finally, a cation modified gamma-polyglutamic acid flocculant is obtained. The prepared cation modified gamma-polyglutamic acid has an obvious flocculating settling effect on seawater; the turbidity removal rate being 89 percent or higher can be reached when the dosing quantity is 2mg / L; the cation modified gamma-polyglutamic acid is an environmental-friendly flocculant.

The invention relates to a device for treating and recycling car washing wastewater by using diatomite. A wastewater regulating tank, a first reactor, an aerobic chamber, a second reactor and a disinfection chamber are arranged in the van body; the first reactor is composed of a first reaction chamber and a first clarifying chamber; the second reactor is composed of a second reaction chamber and a second clarifying chamber; a first feeder is arranged above the wastewater regulating tank; the wastewater regulating tank is communicated with the first reaction chamber through a submersible sewage pump on the bottom; the first clarifying chamber is communicated with the aerobic chamber through the top; the aerobic chamber is communicated with the second reaction chamber through the top; the second clarifying chamber is communicated with the disinfection chamber through the top; the aerobic chamber is communicated with the bottom of the second reactor through a reflux pump; a second feeder is arranged above the second reaction chamber; and a sludge dewatering device is communicated with the first reactor and second reactor and also communicated with the wastewater regulating tank. The device can effectively intercept sludge, microbes and heavy metals, and has the advantages of favorable flocculating settling effect, thorough sludge-water separation and high effluent water quality.

The invention discloses a composite flocculant for piggery wastewater and a biological fermentation treatment method and equipment. The composite flocculant is prepared by mixing modified attapulgite with sodium dichloro cyanurate of which the mass is equal to that of the modified attapulgite; when the composite flocculant is used, the piggery wastewater to be treated and activated sludge are mixed and then added into an anaerobic fermentation tank to form a mixed solution, composite nutrient salt is added into the mixed solution for fermentation, and then fermentation liquid is further treated through the composite flocculant. According to the composite flocculant for the piggery wastewater and the biological fermentation treatment method and equipment, the technical defects that when the composite flocculant treats the piggery wastewater, secondary pollution is prone to be brought, the treatment cost is high, and usage is limited are overcome.

The invention discloses a chemical wastewater advanced treatment agent, a preparation method and application, and belongs to the field of chemical wastewater treatment. The agent comprises activated carbon with the size of 280-300 meshes, diatomite, polymeric ferric salt, polymeric aluminum salt, magnesium salt and poly dimethyl diallyl ammonium chloride, wherein the activated carbon can adsorb organic matters in wastewater and reduce the COD value and chromaticity; magnesium salt can react with phosphate and ammonia nitrogen to form stable precipitate, so that total phosphorus and ammonia nitrogen are removed; the polymeric ferric salt and the polymeric aluminum salt can polymerize, precipitate and remove suspended colloidal macromolecular pollutants; the poly dimethyl diallyl ammonium chloride is a high-molecular cationic flocculant, and also has an excellent decolorizing effect. Through the synergistic effect of the adsorbent and the coagulant, chromaticity, ammonia nitrogen, total phosphorus and COD in wastewater can be better removed, meanwhile, the advanced treatment agent is easy to add and convenient to operate, the wastewater advanced treatment cost can be effectively reduced, and good economic benefits and social benefits are achieved.

The invention discloses a polymeric aluminum ferric chloride-polydimethyldiallylammonium chloride composite coagulant and a preparation method and an application thereof. The method comprises the following steps: heating polyaluminium chloride solution to 40-90 DEG C while stirring the solution, adding polyferric chloride, heating and stirring the solution to perform copolymerization between polyaluminium chloride and polyferric chloride for 0.5-2.0h, obtaining polymeric aluminum ferric chloride solution; adding polydimethyldiallylammonium chloride colloid at room temperature while stirring to obtain a mixed liquor of the two products; stirring at room temperature to ensure that the polydimethyldiallylammonium chloride colloid and polymeric aluminum ferric chloride are completely mutuallysoluble and obtaining the polymeric aluminum ferric chloride-polydimethyldiallylammonium chloride composite coagulant.

The invention relates to a hospital linen wastewater treatment system and method. The system comprises a pH regulating tank, a flocculation tank, a buffer tank, a pretreatment tank, a high-temperaturetreatment device, a cooling device, a hydrolysis acidification tank, a primary biological contact oxidation tank, a primary inclined tube sedimentation tank, a secondary biological contact oxidationtank, a secondary inclined tube sedimentation tank and a filter tank (12) which are sequentially communicated according to the flow direction of sewage. By using the sewage treatment system, the pH ofthe sewage collected by hospitals is adjusted to be neutral, the stability of colloidal particles in the sewage is destroyed under the action of flocculating agents, then large-particle sediments andmost impurities such as thread ends, short fibers and the like in the sewage are intercepted by a filter grid in a pretreatment tank, suspended substances are removed and then enter a hydrolytic acidification tank, macromolecular substances are decomposed into small molecular substances in the hydrolytic acidification tank, organic matters, suspended substances, ammonia nitrogen and the like in the sewage are removed and enter the filter tank (12) through the second biological contact oxidation tank, and then are discharged after being filtered by the filter tank (12).