84results about How to "Stable removal rate" patented technology

The invention discloses a silicon wafer chemical and mechanical polishing composition with high stability, belonging to the technical field of polishing compositions for roughlly polishing a semiconductor silicon substrate material. The polishing composition comprises the following components in percentage by weight: 0.5-50 percent of silicon dioxide abrasive particles, 0.01-10 percent of silicon-containing stabilizer, 0.01-20 percent of organic alkali corrosive, 0.01 -10 percent of organic acid chelating agent, 0.01-5.0 percent of other functional auxiliaries and the balance of deionized water. The polishing solution has a stabilization period of over 2 years, can perform repeated polishing or cyclic polishing, and has stable pH value and removal speed, wherein the number of cyclic polishing times can be up to 10. Meanwhile, the polishing composition has high silicon wafer removal rate up to over 1.0 mum/min, and the cyclic polishing removal rate in multiple times can be stable. The polishing solution is convenient to prepare and easy to use, has low cost, and is suitable for the rough polishing of silicon wafers of various types and sizes in the semiconductor industry.

The invention discloses a method for treating organic chemical wastewater having high COD (chemical oxygen demand) and high concentration of sulfate ions. The method mainly comprises the following steps of: Ca(OH)2 pre-treatment; anaerobic treatment; two-stage aerobic treatment and the like, wherein after the organic chemical wastewater is subjected to Ca(OH)2 pre-treatment to remove most of sulfate ions and H<+> (hydrogen ions), a method for wastewater anaerobic treatment, which takes the advantages of anaerobic bacteria, and a method for wastewater aerobic treatment, which is mainly based on halophilic aerobic microorganisms, can be formed by controlling the microorganisms as the main agent for wastewater treatment and the operating parameter factors. Therefore, the invention is particularly suitable for the treatment of organic chemical wastewater having high COD, high concentration of sulfate ions and low pH value.

The invention provides a method for domestication of salt-resistant activated sludge. The method comprises that substances (such as soil or water) in a high-salt environment are directly added into activated sludge having a normal salt concentration according to a certain ratio and then salt concentration loading is gradually increased, and in the above process, the microflora in the high-salt environment and the microflora in the activated sludge carry out bidirectional coevolution so that novel microflora is formed. The method is free of a complex bacterium screening process, has simple and easy processes, utilizes a novel salinity gradient-increasing scheme, prevents a biomass loss caused by overquick increasing of salinity pressure and realizes fast and efficient domestication of high-salt sludge.

The invention discloses a non-Newtonian fluid thickening polishing method based on a magnetic field assist. The method comprises the following steps: S1: adding non-Newtonian fluid polishing liquid with magnetorheological properties into a polishing liquid tank, and immersing a polishing workpiece in the non-Newtonian fluid polishing liquid through a holding device with a driving system, and turning on a magnetic field generating device; S2: under the action of the driving system, driving the polishing workpiece to rotate by the holding device, enabling the polishing workpiece and the non-Newtonian fluid polishing liquid to move relative to each other, and cutting the surface of the polished workpiece by abrasive grains in the non-Newtonian fluid polishing liquid, thereby completing the polishing process. The invention further correspondingly provides a non-Newtonian fluid thickening polishing system based on the magnetic field assist. The non-Newtonian fluid thickening polishing method provided by the invention is low in consumables cost, high in polishing efficiency and good in polishing effect, and can realize ultra-precision polishing of the polished workpiece.

The present invention discloses the application of RE element in cultivating aerobic sludge particle and controlling sludge expansion. During cultivating aerobic sludge particle, RE element solution of concentration below 30 mg/L is thrown into the biochemical reactor once every three days. Thus cultivated aerobic sludge particle with RE element has short forming period, large particle, low water content, high deposition rate, low SVI, high COD load and other advantages.

The invention discloses a method for treating high-temperature, high-salinity difficult-degradation oil producing wastewater. An organic component, which can be degraded by a microbial agent R1 (4), in the oil producing wastewater is preferentially eliminated in a first-stage aerobic biochemical tank (2); supernate after solid-liquid separation is carried out enters a first-stage ozone pre-oxidizing tank (11) to be pre-oxidized, so that the biodegradability is increased; a biochemical organic matter is further degraded by a microbial agent R2 (21) added into a second-stage aerobic biochemical tank (18), into which outflow water flows; supernate after solid-liquid separation is carried out again flows into a high-stage oxidizing tank (28); little low-biodegradability organic matters remained in water can be thoroughly degraded under the synergistic effect of an ozone generator (15), an ultraviolet lamp light-emitting device (29) and an oxidizing agent adding system (31); and requirements of outflow water to indexes, such as sterilization and chroma, can be achieved. The method is accurate and controllable in target division of various process sections, simple to operate, low in drug adding amount and sludge yield and steady and reliable to output water. The method disclosed by the invention is conveniently popularized and used in the oil field wastewater treatment field.

The invention relates to a chemical mechanical polishing solution. The chemical mechanical polishing solution simultaneously contains grinding granules, halogen-containing oxidant, organic amine, ethylene diamine tetraacetic acid (EDTA) and pH regulator; and the chemical mechanical polishing solution has alkali pH value. The polishing solution has very high polishing rate for silicon and copper under the alkali polishing environment. Amino acid can be continuously added into the polishing solution, so that the removal rate of the silicon and the copper is kept stable.

The invention relates to integrated complete equipment for water quality purification treatment. The equipment comprises a water cooling pool, wherein a water inlet lifting pump and a water inlet pipe are arranged on one side of the water cooling pool, and the water inlet pipe is provided with a first pipeline mixer and a second pipeline mixer at an interval; the output end of the second pipeline mixer is connected with an efficient floating, clarifying and self-flushing and filtering integrated machine and the output end is provided with an output water pipeline and an output mud pipeline; the output water pipeline is connected with a clean water pool, a first clean water pool is provided with a discharge opening, and the output mud pipeline is connected with a sludge concentration pool. The equipment provided by the invention can more maturely, stably and continuously remove all organic matters such as SS (Suspended Solids), oil, chroma and suspended solids, COD (Chemical Oxygen Demand), turbidity and the like in various types of surface raw water, underground water and reuse water of sewage by means of a working principle of the integrated machine combining efficient floating, clarifying, filtering and self-flushing process technical structures, so that the effluent treatment effect is improved, the investment and occupied areas are saved, the power lift of second-level flow is reduced, the pipe valve is shortened, and the operating energy consumption is reduced and the cost of the added chemicals is lowered.

The invention discloses a high-concentration livestock and poultry breeding wastewater treatment method. The denitrification methane production treatment is carried out by using a PABR reactor to mainly remove organic matters in the livestock and poultry wastewater and the nitrate nitrogen in a backflow liquid, and then the short-range nitrification denitrification treatment is carried out by using a MSBR reaction tank. According to the treatment method, the PABR denitrification methane production coupled with the MSBR short-range nitrification denitrification is utilized to treat the high-concentration livestock and poultry breeding wastewater, so that different microbial populations can better play respective functions in the PABR and MSBR reactors, and the efficient removal of the organic matters, ammonia nitrogen and nitrate nitrogen in the livestock and poultry breeding wastewater can be realized.

An integrated lampblack purifying device comprises a casing with an installation cavity in the middle, a pore plate filter, a flow guiding device, a mesh filter, an ultraviolet purifier and a water tank arranged at the lower end of the casing. A water blocking board is arranged on the lower end portion of the casing and provided with an air inlet communicated with an installation cavity, and the pore plate filter, the flow guiding device, the mesh filter and the ultraviolet purifier are sequentially installed in the installation cavity from bottom to top. A fan installation site communicated with the installation cavity is arranged on the upper end portion of the casing, an exhaust fan mechanism is installed on the fan installation site, a distribution tube mechanism is arranged between the pore plate filter and the flow guiding device, a water pump is arranged on the water tank, and the distribution tube mechanism is connected with the water pump through a water conveying tube. The integrated lampblack purifying device integrates multiple purifying modes including physical purifying, chemical purifying and photocatalysis purifying, achieves classified purifying of lampblack and brings better lampblack purifying effect. The integrated lampblack purifying device has a self-cleaning function and can work continuously and effectively for a long time, and no lampblack attachment can be accumulated in the device.

The invention discloses a method for removing arsenic in water by means of nano hematite.The method is characterized by comprising the steps that limonite ore which is of a vesicular structure is utilized to serve as the raw material, breaking and calcining are conducted, and a nano-structured porous granular material with a hematite crystal structure is obtained; the granular material serves as a filter material to be filled into a filter column or a filter tank, arsenic-containing underground water is treated, and removal of arsenic can be achieved.According to the method for removing arsenic in the water by means of the nano hematite, the nano hematite is utilized to remove arsenic in the water, the content of arsenic ions in effluent can be smaller than 0.01 mg/L, the removal rate is stabilized to be 97% or above, and the water quality of the effluent meets the drinking water quality standard; the nano hematite serving as the filter material can be regenerated and reused, and the cost is significantly reduced.

The invention discloses a multistage gradient type indirect condensation device and process for treating VOCS waste gas, belonging to the technical field of waste gas treatment. According to the invention, a waste gas condensation channel A and a waste gas condensation channel B are respectively formed; the waste gas condensation channel A and the waste gas condensation channel B are connected inparallel; the-same-stage condensers are connected with the same cold carrying device in parallel and form a cold carrying loop with the cold carrying device respectively; each stage of cold carrying device is connected with a refrigerating unit; the last stage of refrigerating unit is connected with a heat carrying device; and the-same-stage condensers are connected with the heat carrying device in parallel and form a heat carrying loop with the heat carrying device respectively. According to the invention, a cold-carrying working medium is used as a buffer for heat balance in a system, so stable condensation temperature and recovery treatment effect of VOCS-containing waste gas are ensured when the gas quantity and the composition of the VOCS-containing waste gas are changed.

The invention discloses a method of recyclably pre-treating sludge press filtrate. The method comprises the following steps of: feeding the sludge press filtrate into a filler adsorption section, adsorbing and fixing nitrogen and phosphorus pollutants to filler, and flowing into a sewage treatment plant for follow-up treatment; meanwhile, the filer adsorption section is subjected to regeneration, enriching the nitrogen and phosphorus pollutants on the filler in a regenerated salt solution to regenerate the filler and secondarily transfer the nitrogen and phosphorus pollutants, and then introducing the regenerated salt solution into a microbial reaction section so as to finally remove the nitrogen and phosphorus pollutants by action of microorganisms; and then, feeding new sludge press filtrate, and repeating and successively circulating filter adsorption, chemical regeneration and biological removal. By the adsorbing action of the functional filler, concentrations of organic matters and nitrogen and phosphorus in the press filtrate can be reduced at the same time, so that the impact load on a sewage treatment plant is reduced. The C/N ratio of the treated press filtrate is more suitable for secondary biological treatment of the sewage treatment plant, thereby playing a relatively good pre-treatment role.

The invention belongs to the technical field of wastewater treatment and provides a high-protein wastewater treatment process. The high-protein wastewater treatment process adopts a mechanical grid, a regulating pond, a reaction pond, a flocculation settling pond, a hydrolysis acidification pond, a mixing pond, an EGSB reactor, an air-floated machine, a contact oxidation pond, a first settling pond, an active silt pond and a second settling pond. By means of the technical solution, the problems of poor high-protein wastewater treatment effect and high operation cost of a wastewater treatment process in the prior art are solved.

The invention discloses nornicotine degrading bacteria and a microbial agent produced by the same. The nornicotine degrading bacteria is a gram-positive Pseudarthrobacter sp. strain W1-1 collected ina China Center for Type Culture Collection, and the collection number of the strain is CCTCC NO. M 2018758. The strain W1-1 can degrade nornicotine, the nornicotine degrading microbial agent producedby the strain has the advantages of low production and use cost, convenience in use and good removing effects and is suitable for being used in a biochemical treatment tank for tobacco processing enterprise wastewater. The starting time of a biochemical treatment system can be shortened, nornicotine degrading effects are improved, nornicotine removing rate is kept above 95%, and the nornicotine degrading bacteria have an excellent application prospect and great significance for protecting ecological environments and physical health of people.

The invention discloses a magnetic fluorinated adsorbent for selective adsorption of PFOS, a preparation method and application thereof. The preparation method includes: (1) placing a mineral material with cation exchange capacity in a 0.01-0.5mol/L fluorinated quaternary ammonium iodide solution according to a mass ratio of 1:2-1:20 so as to obtain a fluorinated mineral material; (2) utilizing an organic solvent to wash the fluorinated mineral material so as to obtain a magnetic fluorinated adsorbent crude product; and (3) mixing a nano iron oxide and the magnetic fluorinated adsorbent crude product according to a mass ratio of 1:2-1:50 and conducting ball milling treatment so as to obtain the magnetic fluorinated adsorbent. The adsorption material prepared by the method provided by the invention has very high selectivity, fast adsorption rate and good magnetic separation properties to PFOS, is easy to regenerate and can be used repeatedly. The magnetic fluorinated adsorbent provided by the invention can be used for treatment of wastewater containing PFOS.

The invention provides an attapulgite composite adsorption material, which is prepared from acidized attapulgite, chitosan and titanium dioxide, wherein the chitosan and the titanium dioxide are loaded on the acidized attapulgite, and a mass ratio of the chitosan to the acidized attapulgite is 1 : (50 to 200). According to the attapulgite composite adsorption material disclosed by the invention, the TiO2 and CTS are loaded to the attapulgite carrier with a high specific surface area; the attapulgite is utilized as the carrier, so that the agglomeration phenomenon of the TiO2 is effectively avoided; furthermore, chitosan loading can provide more attachement sites for the TiO2, and particles can be more dispersive and evener. A modified appatulgite structure is converted into a porous shapefrom a lamellar shape, so that the specific surface area is enlarged, the amounts of amino and hydroxyl on the surface are increased, and adsorption performance of the appatulgite is enhanced. Experiment results show that the attapulgite composite adsorption material disclosed by the invention has an effect on common pollutants of humic acid, congo red and Cr(VI) in water treatment, and a removalrate is 90% stably. The invention further provides a preparation method of the attapulgite composite material.

The invention belongs to the field of sewage treatment, and particularly relates to a selective nitrate radical adsorbent preparation method. According to the preparation method, hydrotalcite with anadjustable and controllable interlayer structure and polypyrrole modified montmorillonite are respectively prepared; hydrotalcite is subjected to delaminating separation to form a dispersed lamellar structure; the surface electrical property of a material is changed by utilizing characteristics of adjustable types and adjustable number of the cations of the hydrotalcite polar plate; montmorillonite is intercalated, so that the montmorillonite polypyrrole modification effect is improved, and the adsorption characteristic on nitrate radicals is improved while steric hindrance is formed; and finally the hydrotalcite and the montmorillonite are subjected to composite bonding intercalation to form a layered structure composite material with a certain steric hindrance, wherein the material is applied to adsorption of nitrate radicals in high-salt wastewater (especially high-salt wastewater with high sulfate radical content), and has good adsorption selectivity and good adsorption capacity, wherein the removal rate of nitrate radicals in wastewater is greater than or equal to 70%.