68results about How to "Improve the effect of flocculation and sedimentation" patented technology

The invention discloses a method for preparing a polysilicate ferro-aluminum sulfate composite flocculant from red mud waste. The method comprises the following steps: (1) putting red mud waste and anactivating agent into a muffle furnace to be roasted and grinding the red mud waste to obtain activated red mud powder; (2) putting an oxidizing agent and the activated red mud powder into a sulfuricacid solution to react; (3) adding adjusting salt to adjust a molar ratio of Fe to Al to Si in the solution as 1 to 1 to (0.2 to 0.7), utilizing a pH conditioning agent to adjust a pH of the solutionto 1 to 6; (4) adding a stabilizer to react and filtering to obtain the polysilicate ferro-aluminum sulfate composite flocculant. By means of the method disclosed by the invention, ferric oxide, aluminum oxide and silicon oxide in the red mud waste are effectively utilized to prepare the polysilicate ferro-aluminum sulfate composite flocculant; not only are the problems that the waste red mud occupies a lot of land and pollutes underground water are solved, but also the waste red mud can be resourcefully utilized, production cost is low, added value of products is high, and a novel way for comprehensively utilizing the red mud waste is provided.

The invention belongs to the technical field of waste water treatment equipment, and discloses a car-washing waste water treatment device. The car-washing waste water treatment device comprises a waste water collecting tank, wherein a plurality of collecting holes are formed in the top of the waste water collecting tank; the waste water collecting tank is communicated with a sediment tank through a water pump; a water outlet of the water pump is close to the bottom of the sediment tank; a dosing device for adding flocculating agent is arranged on the sediment tank; the sediment tank is communicated with a filter tank through a pipe; a first filter plate and a second filter plate are arranged in the filter tank; the pipe penetrates through the first filter plate and the second filter plate; the outlet end of the pipe is located below the second filter plate; the filter tank which is located above the first filter plate is equipped with a water discharging pipe; the water discharging pipe is communicated with an active carbon filter; the active carbon filter is further communicated with a disinfecting tank; an ozone generator is arranged on the disinfecting tank; the disinfecting tank is communicated with a clean water reservoir. The car-washing waste water treatment device is simple in structure and low in treatment cost, has a good treating effect because the car-washing waste water treatment device can perform multi-stage purification treatment including flocculent precipitation, filtering by the filter plates, filtering by the active carbon filter, ozone disinfection and so on, and can be widely popularized to be used.

The invention relates to a method for preparing polyaluminum chloride, in particular to a method for preparing low-residual-aluminum polyaluminum chloride. The method is mainly used for solving the technical problem that in the prior art, when polyaluminum chloride serves as a flocculating agent in water high in pH or alkalinity, residual aluminum in the water exceeds the national drinking water standard, namely the concentration is larger than 0.2 mg/Kg. The method includes the steps that firstly, hydrochloric acid and an aluminum-containing raw material are put in a closed reaction kettle and fully stirred, water, calcium aluminate powder or sodium aluminate is added into polyaluminum chloride liquid in the closed reaction kettle, the mixture is discharged to a stirring tank through filter pressing after reaction is completed, and 50-150 Kg of a sodium dihydrogen phosphate and disodium hydrogen phosphate mixed aqueous solution is added into each ton of the mixture in the stirring tank, wherein the sodium dihydrogen phosphate and disodium hydrogen phosphate mixed aqueous solution comprises, by mass fraction, 20-30% of sodium dihydrogen phosphate, 5-15% of disodium hydrogen phosphate and the balance water; the finished polyaluminum chloride is obtained after stirring.

The invention discloses efficient flocculant for improving the yield of stevioside. The efficient flocculant comprises, by weight, 30-40 parts of modified lignin, 25-35 parts of modified polymerization ferric sulfate, 3-6 parts of polyaluminum ferric chloride, 12-15 parts of polyaluminium sulfate, 4-8 parts of magnesium citrate, 12-20 parts of xanthan gum, 2-3 parts of activated carbon, 1-2 parts of kieselguhr and 2-4 parts of zeolite powder. The efficient flocculant for improving the yield of stevioside is fast in flocculoreaction, the production period is shortened, and particles of a flocculating constituent are large, and are easy to separate.

The invention relates to a flue gas cleaner with integration of desulfurization, denitrification, mercury removal and dust removal. The flue gas cleaner comprises an integrated cleaning tower arranged on a base, a spiral flue duct, a dry absorbing and cleaning agent applying device and a wet absorbing and cleaning agent applying device, wherein an automatic slag remover, a flocculation and precipitation cleaning working zone, an inner precipitation circulating zone and an outer precipitation circulating zone are arranged in the base; an inner wall cleaning fluid collecting water channel is formed between the inner precipitation circulating zone and the outer precipitation circulating zone; the outer precipitation circulating zone is divided to form winding paths by a transverse partition board; the integrated cleaning tower is divided into a demisting and dewatering cleaning working zone, an absorption cleaning working zone and an oxidation cleaning working zone by a gas-water separator; an annular sprayer, a backwash cylindrical sprayer and a demisting filter screen are arranged in the demisting and dewatering cleaning working zone respectively; a main cylindrical sprayer is arranged in the absorption cleaning working zone; a cylindrical oxidation cleaning agent sprayer is arranged in the oxidation cleaning working zone; a flue gas outlet and a spray circulating system are arranged at the top of the integrated cleaning tower respectively. The flue gas cleaner has significant cleaning effect.

The invention discloses a treatment system for electroplating wastewater, and relates to the technical field of sewage treatment. The system comprises a natural sedimentation pond, a chromium breakingreaction tank, a neutralization reaction tank, a first flocculation and precipitation pond, an electrolysis tower, a second flocculation and precipitation pond and a comprehensive filtering device which are successively connected, the chromium breaking reaction tank is connected with an acid agent addition box and a reduction agent addition box in sequence, and the neutralization reaction tank isconnected with organic processing cleaning water, nickeling wastewater, coppering wastewater and an alkaline agent addition box; filtration partition plates are obliquely arranged in the first and second flocculation and precipitation ponds, lifting devices are connected with the filtration partition plates, and spinous inverse hooks are arranged on the end surfaces of the filtration partition plates; the filtration partition plates are connected with floating balls through ropes, a setting agent is arranged in the floating balls, in the electrolysis tower, scrap iron is used as an anode, carbon granules are used as a cathode, the wastewater is used as an electrolyte solution, so that a tiny primary battery is formed, and the electrolysis tower is connected with an aeration device and theacid agent addition box; the system has the advantages of improving the quality and efficiency of treating the electroplating wastewater.

The invention discloses an oily wastewater adsorbent and a preparation method thereof. The oily wastewater adsorbent is prepared from coal ash, rape straws, calcium hydroxide, magnesia, ethyl orthosilicate, ferroferric oxide and the like. The straws are mixed with the coal ash, by the aid of loose porous excellent carrier performances, the magnesia is modified to prepare particles, the finished adsorbent particles have the advantages of light weight, high chemical stability and the like, environmental pollution is avoided, the oily wastewater adsorbent is simple to operate, low in cost and recyclable, the concentration of residual COD (chemical oxygen demand) and the like in wastewater meets national emission requirements after adsorption treatment is performed on the oily wastewater, andthe oily wastewater adsorbent is suitable for large-scale oily wastewater treatment.

The invention provides a composite cationic polyacrylamide flocculant and a preparation method thereof. The composite cationic polyacrylamide flocculant comprises the following raw materials in partsby weight: 50-80 parts of starch polyacrylamide, 20-50 parts of activated silicic acid, 0.9-2 parts of liquid polyaluminum chloride, 0.1-0.5 part of a stabilizer, 7-12 parts of zinc sulfate, 7-12 parts of magnesium sulfate and 1-5 parts of a borax solution. In the present invention, the activated silicic acid can increase the polymerization degree of the polyaluminium chloride and adjust the internal charge structure of the polyaluminium chloride; the activated silicic acid interacts with aluminum ions in the system to generate larger polymer (polyaluminum silicate chloride), and the polyaluminum silicate chloride simultaneously has three functions of electrostatic neutralization, adsorption bridging and net capture in the wastewater treatment process, so that the flocculation settling capacity of the composite flocculant is enhanced, and the obtained flocculant is relatively moderate in price and relatively high in cost performance.

The invention discloses a coal chemical wastewater pretreatment method. The method includes flocculent settling treatment, hydrogen peroxide catalytic oxidation treatment and internal electrolysis treatment, and effluent quality reaches that COD is smaller than or equal to 500mg/L, ammonia nitrogen content is smaller than or equal to 200mg/L, and suspended matter content is smaller than or equal to 70mg/L after treatment. After treatment according to the pretreatment method, wastewater available for biochemical treatment is obtained and can be directly discharged or recycled after biochemicaltreatment. A treatment system is stable in operation, and biochemical degradability of coal chemical wastewater is effectively achieved. The coal chemical wastewater pretreatment method and the pretreatment system have positive popularization significance and remarkable application value.

The invention discloses a kitchen waste treatment method. The kitchen waste treatment method comprises the steps of kitchen waste sorting and crushing, microbial fermentation decomposition, oil-water separation, aeration air flotation separation, hydrolysis-anaerobic fermentation, A/O tank treatment, hydrolysis-MBR treatment and disinfection treatment. The effluent quality reaches the discharge or reuse standard, the whole treatment process is carried out at normal temperature, high-temperature drying is not needed, the defects that in the prior art, kitchen waste treatment needs high-temperature treatment, energy consumption is high, and the decrement rate is low are overcome, kitchen waste treatment in the normal-temperature aerobic environment is achieved, energy consumption is low, the decrement rate reaches up to 99%, final products obtained after organic matter decomposition are carbon dioxide and water, no secondary pollutant is generated, environmental pollution is reduced, and the environmental comprehensive treatment capability of kitchen waste treatment is greatly improved.

The invention belongs to the technical field of chelating agents, and in particular relates to a synthesis method of a heavy metal chelating agent. The synthesis method comprises the steps of 1, adding excess carbon disulfide to active polymer aliphatic amine under an alkaline condition to enable active polymer aliphatic amine to react with the excess carbon disulfide so as to obtain an intermediate product, wherein the active polymer aliphatic amine is at average molecular weight of 200,000 to 300,000; 2, adding hydroxide powder to the intermediate product, agitating, and then performing solid-liquid separation to obtain the heavy metal chelating agent. Compared with the prior art, the synthesis method has the advantages that the prepared heavy metal chelating agent with relatively large average molecular weight is added to heavy metal ion containing wastewater to greatly improve the capacity of flocculating settling after reacting with the heavy metal ion, and therefore, the problem of pollution caused by wastewater with relatively low heavy metal concentration can be effectively solved.

The invention discloses a modified dicyandiamide formaldehyde-mimic enzyme compound sewage treatment agent. The sewage treatment agent is prepared from 20 to 50 parts by mass of a modified dicyandiamide formaldehyde polymer, 1 to 5 parts by mass of ethylene diaminetetraacetic acid tetrasodium salt, 5 to 20 parts by mass of ferrous sulfate heptahydrate, 1 to 3 parts by mass of polyferric sulfate, 1 to 5 parts by mass of calcium sulfate and 2 to 6 parts by mass of aluminum sulfate. A modifier of the modified dicyandiamide formaldehyde polymer is ethylenediamine or N-dihydroxyaniline or 2-imidazolidinone. The invention utilizes combination of a mimic enzyme technology and the modified dicyandiamide formaldehyde to improve the reaction efficiency of oxidation, complexation and polymerization of the mimic enzyme and organic pollutes. The sewage treatment agent realizes stable mimic enzyme catalysis and has good organic pollutants and chroma removal effects and has a low cost.

The invention discloses sewage and sludge separation and cyclic utilization equipment for constructional engineering, relates to the technical field of sewage treatment equipment, and solves the problems that in existing sewage equipment, a traditional rotary stirring part integrally stirs sewage, the sewage around a flocculating agent spray pipe cannot be accurately stirred, and the sewage treatment efficiency is low, and therefore the problem of insufficient diffusion and mixing of the flocculating agent and the sewage is solved. The equipment comprises a sewage tank that comprises a rail groove, a positioning ring, a transmission shaft and a positioning shaft, the sewage tank is of a rectangular structure as a whole, a cover plate is tightened and fixed to an opening in the top end, andtwo water inlet pipelines are symmetrically and vertically welded to the cover plate in a supporting mode; and four vertical rail grooves are symmetrically formed in the front inner wall and the rearinner wall of the sewage tank. The four expansion plates arranged in a surrounding manner can synchronously expand, support, gather and slide to precisely stir sewage around the feeding spray pipe, so that a flocculating agent sprayed by the feeding spray pipe can be fully stirred and diffused to be mixed and react with the sewage.

The invention discloses a physicochemical sewage processing system and method for simultaneously removing COD and total phosphorus. The sewage processing system comprises an improved reaction tank, animproved horizontal flow sedimentation tank, a magnetic powder recovering system, and a sludge discharge system. The improved reaction tank is divided into a coagulation reaction region, a magnetic powder loading region, and a flocculation reaction region. Between the improved reaction tank and the improved horizontal flow sedimentation tank, a water distribution adjusting region is arranged. A flow adjusting device and a triangular guide plate are arranged in the water distribution adjusting region. A horizontal pipe is arranged in the upper layer of the improved horizontal flow sedimentation tank, and a mud scraper is arranged on the bottom of the improved horizontal flow sedimentation tank. The magnetic powder recovering system comprises a separation groove, a cutting machine, and a magnetic separator, which are arranged in sequence. The sludge discharged from the bottom of the improved horizontal flow sedimentation tank is introduced into the separation groove through a pipeline;the separation groove is provided with two sludge discharge pipelines; one of the sludge discharge pipelines is connected to the magnetic powder loading region of the improved reaction tank, the otherone is connected to the cutting machine; and the magnetic powder separated by the magnetic separator is added into the magnetic powder loading region again. The provided system and method can efficiently remove COD, TP, and SS.

The invention relates to the technical field of sewage treatment, and discloses an efficient flocculation precipitation system. In order to improve the efficient performance of sewage flocculent precipitation, the number of mixing tanks is eight, the number of flocculation tanks is four, the number of precipitation tanks is four, the number of mud plants is two, every two groups of mixing tanks are in one-to-one correspondence with one group of flocculation tanks, the flocculation tanks are in one-to-one correspondence with the precipitation tanks, and the mud plants are positioned between the flocculation tanks and the precipitation tanks. The system has the advantages that the removal effect of phosphorus and suspended solids in sewage can be improved for water entering the system while the adding amount of a flocculant is calculated and controlled according to the water quality condition, so that the flocculation and sedimentation effect is improved, the suspended solids and total phosphorus are effectively removed (the removal rate of the suspended solids is larger than 60%, and the removal rate of the total phosphorus is larger than 80%), the labor cost can be reduced, and the high efficiency of flocculent precipitation can be improved.

The invention relates to a method for deep oxidation treatment on organic wastewater by activating peroxymonosulfate based on visible light-assisted complexing iron ions. The method comprises the following steps: adding PMS (peroxymonosulfate) into initial organic wastewater, performing sufficient mixing, adding a mixed liquid of an oxalate and a trivalent iron salt, performing irradiation with anLED (light emitting diode) lamp and performing a stirring reaction synchronously, adding an alkali liquid and calcium hydroxide, and performing uniform stirring and precipitation, so as to effectively reduce CODcr (dichromate oxidizability) in supernatant tail water. By adopting the method, under the condition that the initial pH value of wastewater is not adjusted, iron ion precipitation is controlled by using a complexing agent, and under the action of visible light, circulation generation of ferrous ions is promoted, the PMS is continuously catalyzed and activated to produce strongly oxidized sulfate radicals, organic pollutants can be effectively oxidized and degraded, and thus CODcr in wastewater can be effectively removed. The method has the characteristics of being good in operability, low in energy consumption, wide in pH value application range, good in oxidation reaction continuity, high in organic matter oxidation degradation efficiency, and the like, and has great application potential in the field of deep wastewater treatment.

The invention discloses a cadmium pollution adsorbent and a preparation method thereof. The cadmium pollution adsorbent is prepared from raw materials of brown alga, glucose, magnesite, tetraethoxysilane, ferroferric oxide powder and the like. According to the cadmium pollution adsorbent and the preparation method thereof, the brown alga is used as a biological adsorbent, and the adsorption capacity of the brown alga is increased by crosslinking modification; the brown alga is combined with the modification magnesite under the adhesion of the glucose, and then carries manganese dioxide throughimpregnation of potassium permanganate to add ion exchange and complexing for cadmium to repair cadmium pollution. Compared with the prior art, the cadmium pollution adsorbent disclosed by the invention realizes relatively high adsorption efficiency and achieves a relatively good repair effect under a condition of use of a small number of repair agent, and no pollution is caused to the environment.

The invention belongs to the technical field of production of soybean protein isolate, in particular relates to an acid precipitation system for the soybean protein isolate, and further discloses an acid precipitation method of the soybean protein isolate. The acid precipitation system comprises an acid precipitation tank and a precipitation tube bundle which are sequentially connected; spacer plates with flow through holes in different positions are additionally arranged on the acid precipitation tank, so that a flow path of acid precipitate liquid in a reaction cavity can be changed, the flocculation time of the acid precipitate liquid is further prolonged, the pH value stability rate of the acid precipitate liquid is accordingly increased, and the extraction efficiency of a final product is further increased; the precipitation tube bundle is used for enhancing the effect of flocculation-precipitation, and is beneficial to protein molecular flocculation so as to enlarge protein particles and further enhance the flocculation effect, so that a material is easier to separate in subsequent centrifugal treatment, protein loss in legumelin is effectively reduced, and the protein yieldis increased.