284 results about "Substance removal" patented technology

Biological nutrient removal (BNR) in municipal wastewater treatment to remove carbonaceous substrates, nutrients and phosphorus, has recently become increasingly popular worldwide due to increasingly stringent regulations. Biological fluidized bed (BFB) technology, which could be potentially used for BNR processes, can provide some advantages such as high efficiency and compact structure. This present invention incorporates the fixed-film biological fluidized bed technology with the biological nutrient removal in a liquid-solid circulating fluidized bed, which has achieved the simultaneous elimination of organic carbon, nitrogen and phosphorus, in a very efficient manner and with very compact space requirements. The BNR-LSCFB has two fluidized beds, running as anoxic/anaerobic and aerobic processes to accomplish simultaneous nitrification and denitrification and to remove carbonaceous substrates, nutrients and phosphorus, with continuous liquid and solids recirculation through the anoxic/anaerobic bed and the aerobic bed. The new BNR-LSCFB system is not only an excellent alternative for conventional activated sludge type BNR technologies but is also capable of processing much higher loadings and suitable for industrial applications.

The invention provides a technology and a method for treating urban sewage by three-section short-cut nitrification/ anaerobic ammonia oxidation, and belongs to the technical field of biological treatment of sewage. A raw water tank, an organic substance removal sequencing batch reactor (SBR), a first regulating water tank, a short-cut nitrification SBR (provided with an on-line monitoring and feedback control system), a second regulating water tank and an autotrophic nitrogen removal up-flow anaerobic sludge bed/ blanket (UASB) reactor are sequentially connected in series in the technology; and the sludge is separated according to the sludge age, so that the contradiction between denitrification and phosphorus removal sludge age is solved. By applying the real-time control technology of the short-cut nitrification SBR to the autotrophic nitrogen removal technology, the problems that the half short-cut of low ammonia nitrogen short-cut nitrification in continuous flow is difficult to maintain, the concentration ratio of ammonia nitrogen to nitrous in the effluent is difficult to control and the like are solved. By successfully applying the anaerobic ammonia oxidation technology todeep denitrification treatment of the domestic sewage, urban sewage treatment with high efficiency and low energy consumption is realized.

A process and apparatus for the liquefaction of natural gas including an improved heavy hydrocarbon removal column with overhead condensing and refluxing. Particularly, a methane-rich stream exiting a propane refrigerant cycle is delivered to a heavies removal column, and the heavies depleted vapor from the column is at least partially condensed and the liquid portion provided as reflux to the heavies removal column.

The invention provides a combined process of tower angleworm bio-filters and constructed wetlands for treating the domestic sewage. The combined process comprises the following steps: firstly, the sewage enters a hydrolysis-acidification pool and stabilizes after the action, and the water quantity is adjusted; secondly, the domestic sewage in the hydrolysis-acidification pool is distributed into a hydrolysis-acidification pool for removing COD, total nitrogen, nitrogen-nitrogen, total phosphorus and pathogeny microbes; and thirdly, the tail water in the second step enters a constructed wetland to be subjected to strengthening treatment, thereby building a suitable waterfront surroundings landscape, or the tail water is recycled by serving as reclaimed water. The combined process has the following advantages: firstly, the system hydraulic loading is high, and the surface hydraulic loading can reach 1m<3>/m<2>*d, thereby greatly saving land; and secondly, under the high hydraulic loading, the total nitrogen removal rate of the system can reach more than 85 percent; the removal rates of other materials in the system are all more than 90 percent, the effluent reaches the primary standard of the national sewage comprehensive emission standard (GB8978-1996), and reaches the miscellaneous domestic water quality standard of the PRC construction standard (CJ25.1-89), thereby being able to be recycled by serving as the reclaimed water.

The invention discloses a continuous preparation technology of high-purity low-viscosity dimethicone. The continuous preparation technology comprises the following steps that 1, a mixture of methylcyclosiloxane and an end-capping reagent is orderly subjected to liquid nitrogen freezing dehydration and deep dehydration until the water content of the mixture is less than 300ppb; 2, the treated mixture is subjected to adsorption filtration, nanofiltration membrane filtration and pre-heating, then is fed into a fluidized bed with a catalyst and undergoes a catalytic reaction; and 3, reaction products are subjected to adsorption filtration, nanofiltration membrane filtration and a low-boiling-point substance removal process so that a low-boiling-point substance is removed and the high-purity low-viscosity dimethicone is obtained. The high-purity low-viscosity dimethicone obtained by the continuous preparation technology has the advantages of low ion content, low hydroxyl content and low solid content. The continuous preparation technology has a raw material utilization rate of 100%, realizes zero discharge, is an environmentally friendly green technology and is suitable for low-viscosity dimethicone production.

An object of the present invention is to provide a hollow fiber membrane type body fluid treatment device having very high substance removal performance which was not sufficiently achieved in a prior art and allowing the effective prevention of damage to hollow fiber membrane end portion due to impact by falling or impact by water flow. The hollow fiber membrane type body fluid treatment device comprising a hollow fiber membrane type body fluid treatment module comprising at least a tubular housing charged with a hollow fiber membrane bundle having resin layer fixed the bundle with a resin composition at both ends thereof and connection ports for a treatment liquid inlet and outlet formed in the outer peripheral surface of the tubular housing near both ends thereof and header caps provide with connection ports for a treatment target liquid fitted to both ends of the tubular housing. The hollow fiber membrane type fluid treatment device is characterized in that the device has a diameter-expanding portion allowing hollow fiber membranes to be placed so that distances between the hollow fiber membranes can be gradually increased toward the end face of the treatment liquid inlet on the inner surface of the tubular housing at the inlet side of the treatment liquid.

The invention discloses a control method and device for deep denitrification treatment of garbage leachate by combination of short-range nitrification and anaerobic ammoxidation, relating to the field of biological sewage treatment. The invention can solve the problem of difficulty in deep denitrification of garbage leachate. Denitrification reaction and organic substance removal are carried out in a first SBR (sequencing batch reactor), and the process is controlled by real-time ORP and pH monitoring. 60% of effluent water of the first SBR directly enters a second SBR to be subjected to short-range nitrification which is controlled by real-time DO and pH monitoring. 40% of effluent water of the first SBR and effluent water of the second SBR are mixed and enter an ASBR (anaerobic sequencing batch reactor) in a continuous water inlet mode to be subjected to anaerobic ammoxidation, and the process is controlled by real-time pH monitoring. After draining, 70% of effluent water flows back to an influent water tank, and the rest of effluent water is discharged for the next cycle. The invention can accurately control the denitrification mixing time as well as organic substance removal and short-range nitrification aeration time, and has the advantages of energy consumption saving, shorter reaction time, no need of external carbon source, high TN removal rate and the like.

The invention discloses a double-arc sieving type light component separator with a spraying function. The separator comprises a box base body which is matched with a box cover body above; an inner cavity in the middle of the box base body is longitudinally provided with two stirring shafts in parallel; the inner wall of the box base body is provided with a double-arc bottom sieve plate, the inner wall of the box cover body is provided with a double-arc top sieve plate, and the double-arc bottom sieve plate and the double-arc top sieve plate are in a pair up and down; the middle and the right side part of the double-arc bottom sieve plate are provided with filter holes; the top of the right end of the box cover body is provided with a feeding hole, and a cleaning water inlet part connected with an outer water source is arranged on the left side of the feeding hole and at the top of the box cover body. With a double-shaft multi-blade mode, the separator has a good crushing and shearing effect, the recycle ratio of organic matters in kitchen garbage is improved, and the double functions of organic matter extraction and large heavy substance removal are achieved. With a movable box cover structure, the separator is convenient to operate, maintain and clean. With motor driving and belt drive manners, the separator has the advantages that the driving force is direct, the efficiency is high, the structure is simple, and the maintenance is convenient and rapid.

The invention relates to a micro-polluted surface water treatment method based on a bio-membrane reactor. A ceramic carrier water pump is employed for driving a baffle-plate internal-circulating bio-membrane reactor to performing denitrification, dephosphorization and/or organic substance removal to micro-polluted surface water. A separation plate is arranged in the bio-membrane reactor to separate the interior of the reactor into an oxygen dissolving zone at the upper part and a bio-degradation zone at the lower part, wherein the oxygen dissolving zone is communicated with one end of the bio-degradation zone while the other end of the bio-degradation zone is communicated with a circulation pipe through a circulation pump, so that waste water to be treated flows through the oxygen dissolving zone and the bio-degradation zone continuously. A plurality of flow guide boards are vertically arranged in the bio-degradation zone at interval and are arranged in a high-low interlaced manner, thereby forming a channel in which solution can flow in a vertical baffled manner in the reactor. The flow guide boards are used as a carrier of a bio-membrane. Compared with a reactor in the prior art, by means of the reactor, ammonia nitrogen and total nitrogen in polluted river water are removed well and a certain removal effect on total phosphorus and organic substances in water is achieved too.

The invention relates to a sewage treatment method, which comprise the following steps: firstly, the sewage is pre-treated, absorbed and subsided; secondly, the sewage after treated in the first step is mixed with the back-flow substances in the Aerobic pond and sedimentation pond, and enters anoxic pond to finish the denitrifying and degradation of partial organic contaminations; thirdly the water after treated in the anoxic pond flows into the aerobic pond added with biological fillings; fourthly, the sedimentation is treated, the purified water flows out. By the above improved novel sewage treatment method, the nitrogen-removing and dephosphorization capability of the original AB sewage treatment process is enhanced, under the condition of not adding constructions, the organic substance removal capability of sewage treatment factory can be improved, thereby meeting the requirements of enlarging capacity and enhancing efficiency, and having obvious economic benefit.

The invention provides a method for preparing natural ossein, which adopts extraction and purification from beasts and birds bones and comprises the following steps: cleaning; crushing; degreasing and inorganic substance removal; acid soaking; enzyme hydrolysis; separation and purification; and freeze drying. The natural ossein prepared by the method can keep a complete collagen triple helix structure so that the biological activity is retained, the purity can reach more than 90 percent, and the natural ossein has higher extraction yield and can be widely applied in the fields of foods, cosmetics, biomedicine and the like.

The invention discloses a domestic sewage treatment microbial inoculant which comprises polyacrylamide, polyethyleneimine, silicon dioxide and compound microorganisms, wherein the compound microorganisms include Bacillus subtilis, Pseudomonas aeruginosa, Bacillus cereus, Candida lipolytica, nitrobacteria and Paracoccus denitrificans. The treatment agent can effectively treat domestic sewage, is low in cost and favorable in effect, and reduces pollution of the domestic sewage to the ecological environment; the sewage suspended substance removal rate is up to 99.8%, the BOD (biochemical oxygen demand) removal rate is 98%, the COD (chemical oxygen demand) removal rate is 98.6%, the chroma is 5, and the sludge quantity is so low that no sludge treatment system needs to be arranged; and the domestic sewage treatment microbial inoculant causes no secondary pollution, and is stable in treatment effect, environment-friendly and non-toxic.

The invention discloses a preparation method of a filtering medium for removing micro radioactive substances in water, comprising the following steps: a. mixing raw materials containing ultra-high molecular weight polyethylene, active carbon, zeolite powder, diatomite powder, attapulgite powder, magnesium hydroxide powder and a gas generation agent according to the weight ratio of 250-350 to 20-100 to 10-100 to 20-110 to 20-100 to 20-100 to 70-150; and b. pressing, sintering and cooling a mixture obtained in the step a in a mould. The invention also discloses a filtering medium prepared by using the preparation method. The invention has the advantage that the disclosed technical scheme can remove the micro radioactive substances in the water, and the removing rate can reach more than 96 percent.

The invention discloses a method for preparing a sintering-free cementing material from waste incineration fly ash. The method comprises the following steps: (1) mixing silicon slag and blast furnaceslag, grinding, sieving to obtain a mixed silicon material, and mixing graphite powder and waste incineration fly ash to obtain graphite fly ash; (2) mixing sodium hexametaphosphate, the mixed siliconmaterial and graphite fly ash to obtain a gel precursor material; (3) dissolving the gelling precursor material in water, stirring while performing low-temperature plasma irradiation, drying, grinding and sieving to obtain a secondary cementing material; (4) mixing aluminum hydroxide waste and alkaline residues, grinding, and sieving to obtain an aluminum activator; and (5) uniformly mixing the aluminum activator and the secondary cementing material to obtain the cementing material. High-temperature sintering is not needed in the preparation process, so that process energy consumption is greatly reduced; the cementing material can achieve the highest heavy metal curing rate of 99.24%, the highest chlorine removal rate of 98.75% and the highest dioxin substance removal rate of 98.37%; andthe uniaxial compressive strength of a prepared mortar test block is as high as 50.68 MPa.

Use of an aluminium composite material in a thermal joining method, said material consisting of at least one aluminium core alloy and at least one external brazing layer consisting of an aluminium brazing alloy provided on one or both sides of the aluminium core alloy, wherein the aluminium brazing layer has a pickled surface. Reduced costs and a lower environmental impact is achieved by using an aluminium composite material in which the pickled surface of the aluminium brazing layer had been pickled by pickling with an acid, aqueous pickling solution containing at least one mineral acid and at least one complex-forming agent or a complexing mineral acid, wherein the removal of material in the pickling is between 0.05 g/m² and 6 g/m², the aluminium composite material is used in a flux-free, thermal joining method, and the joining method is carried out in the presence of a protective gas.

The invention discloses a method for releasing biological toxicity of mixed acid nitrified wastewater, and belongs to the technical field of organic chemical wastewater treatment. The method comprises the following three steps: (1) zero-valent iron reaction, namely introducing high-concentration mixed acid nitrified wastewater into a reactor to carry out reduction reaction with zero-valent iron in the reactor; (2) advanced oxidation, namely adding oxidant into the wastewater subjected to the zero-valent iron reaction to carry out oxidation reaction under the condition of full mixing; and (3) coagulating sedimentation, namely adjusting the pH value of the oxidized wastewater to be weakly alkaline, adding coagulating agent into the wastewater to carry out full reaction and sedimentation, wherein the discharged water can flow into a biochemical system. The method can effectively reduce the biological toxicity of the wastewater to meet the requirement of subsequent biochemistry. By adopting the method, the removal rate of nitrobenzene and phenyl amine substances is more than 95 percent, the removal rate of COD is more than 50 percent, the BOD is improved by more than 80 percent, the ratio of B to D is improved to more than 0.4, and the biological toxicity is reduced greatly.

The invention provides a technology and a method for treating urban sewage by sectional parallel anaerobic ammonia oxidation, and belongs to the technical field of biological treatment of sewage. A raw water tank, an organic substance removal sequencing batch reactor (SBR), a short-cut nitrification SBR, a regulating water tank and an autotrophic nitrogen removal UASB reactor are adopted in the technology; the raw water tank is respectively connected with the organic substance removal SBR and the short-cut nitrification SBR through two peristaltic pumps; and the effluents of the organic substance removal SBR and the short-cut nitrification SBR are discharged to the regulating water tank, and the sewage in the regulating water tank enters the autotrophic nitrogen removal up-flow anaerobic sludge bed/ blanket (UASB) reactor to realize removal of nitrogen. After a nitrification system drains water, the domestic sewage is added for post denitrification, so that implementation of short-cut nitrification and stability maintenance are facilitated; the concentration ratios of NH4<+>-N and NO2<->-N in the regulating water tank can be flexibly controlled by parallely connecting the organic substance removal SBR and the short-cut nitrification SBR; and the anaerobic ammonia oxidation technology is successfully applied to deep denitrification treatment of the domestic sewage, so that sewage treatment with high efficiency and low energy consumption is realized.

The invention relates to the distillation and producing method of a kind of amylase material used for accelerating cell adhesive growth. The invention gets natural medicament bletilla striata tuber to have amylase component elementary distillation, eliminate albumen through small molecule hydrophobic substances, then through ion exchange chromatogram and gelatin filtration chromatogram to get pure distilled object bletilla striata amylase material, which is solid and dusty, then have antiseptic treatment. As a kind of amylase, the bletilla striata amylase got from separation and distillation of the natural medicament bletilla striata in the invention can affect with the extracellular matrix (ECM) components, and accelerate cell adhesive and cell wall adnate growth; meantime, the membrane cross-linked by bletilla striata amylase has good molding, strong tenacity, good biology compatibility and degeneration, so it's good choice in tissue engineerig material. It has solves the disadvantage which present technology can't overcome, that amylase substance has strong hydrophilicity and hard plasticity. The preparation method is simple, easy to control and low-cost.