36 results about "Biosorption" patented technology

The invention relates to a method for repairing light rare earth and heavy metal compound polluted soil, which is characterized in that the compound polluted soil is repaired by adopting bacillus sp., the bacillus sp. Is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC No.22085, and the preservation date is March 29, 2021. The repairing process comprises the following steps: mixing the bacillus subtilis bacterial liquid with the cementing liquid to obtain a mixed liquid; mixing the air-dried polluted soil with the mixed solution, and filling the mixture into a mold for reaction; the mold is communicated with a grouting pipe to inject the mixed liquid, and multi-round pumping is carried out; and after pumping is completed, the polluted soil is maintained and naturally air-dried. According to the method, dominant strains are adopted, biological adsorption and biological mineralization are combined, and effective control over the light rare earth and heavy metal compound contaminated soil is achieved under the action of dual bioremediation.

The application discloses magnesium modified straw biochar as well as a preparation method and application thereof, and belongs to the technical field of bio-adsorption materials. The preparation method of the magnesium modified straw biochar comprises the following steps: after straw is immersed in a magnesium salt solution (the concentration of the magnesium salt solution is 0.05-0.5 mol / L) and carbonized, the magnesium modified straw biochar is obtained. The magnesium modified straw biochar prepared by the application has a high specific surface area and rich surface functional groups, can effectively adsorb phosphorus in sewage, and realizes effective removal of phosphorus in eutrophic water bodies.

The present application relates to the technical fields of wastewater purification and energy storage material, and discloses an energy storage carbon material, a preparation method and application thereof.The method comprises the following steps: carbonizing biomass waste enriched with metal ions to obtain an energy storage carbon material.The energy storage carbon material can be used to prepare a secondary metal / ion battery.The energy storage carbon material prepared by the present application can promote the uniform deposition of metal in the charging and discharging process, avoid the safety problems caused by dendrite growth, and at the same time, the metal ions in industrial wastewater can be used to prepare high-value-added secondary battery energy storage materials by means of a simple and low-cost method of biosorption.

The application discloses a method for repairing light rare earth and heavy metal composite contaminated soil, and adopts bacillus megaterium (Bacillus megaterium) to repair the composite contaminated soil. Oceanobacillus sp. The bacillus megaterium is preserved in the China General Microbiological Culture Collection Center, has a preservation number of CGMCC No.22085, and is preserved on March 29, 2021. The repairing process is as follows: mixing bacillus megaterium liquid and cementing liquid to obtain a mixed liquid; mixing the air-dried contaminated soil and the mixed liquid, and then loading the mixed liquid into a mold for reaction; connecting a grouting pipe to the mold to inject the mixed liquid, and performing multiple rounds of pumping; after the pumping is completed, the contaminated soil is maintained and air-dried naturally. The application adopts the advantage strain, combines biological adsorption and biological mineralization, and realizes the effective control of the light rare earth and heavy metal composite contaminated soil under the action of double biological repair.

The application discloses a kind of metal organic framework-based biological trickling filter fillings, including soluble metal salt, organic ligand and binder.It also includes preparation method, including soluble metal salt is mixed with organic ligand in solvent, heating reaction, obtain metal organic framework material;Metal organic framework material is mixed with binder granulation, obtain metal organic framework-based biological trickling filter fillings.The preparation method of the biological trickling filter fillings is simple, structural performance is stable, with great specific surface area and strong biological adsorption capacity, sulfur-containing malodorous waste gas has very good adsorption effect at the same time, degradation efficiency is higher, can effectively make adsorption method and biological method be combined, and play the advantages of two, compared with prior art, the removal rate of hydrogen sulfide, organic sulfide, benzene series in sulfur-containing malodorous waste gas can reach 99.5% in the application.

The invention discloses a titanium white waste acid treatment process, and relates to the technical field of industrial waste regeneration. The titanium white waste acid is subjected to microfiltration and membrane electrolysis treatment, sulfuric acid is separated and recycled under the control of constant pressure and constant current, and residual liquid is subjected to electrodialysis treatment to oxidize ferrous ions into ferric hydroxide precipitates and calcined into ferric oxide; carrying out reduction leaching on the titanium-containing material, hydrolyzing to generate metatitanic acid, and calcining to obtain titanium dioxide; oxidizing the hydrolysate to precipitate vanadate, and calcining to obtain vanadium pentoxide; adjusting the pH value of the filtrate, selectively adsorbing scandium through a biological adsorption column, precipitating and calcining the eluent to obtain scandium oxide, and regenerating and recycling the adsorbent through acid pickling. According to the process, through multi-stage treatment and biological adsorption, resource recycling of sulfuric acid, iron, titanium, vanadium and scandium components in the waste acid is achieved, the process is clean and efficient, secondary pollution of a traditional process is avoided, and a green low-carbon solution is provided for waste acid treatment in the titanium dioxide industry.

The application provides a groundwater in-situ remediation system and method of multiple biological permeation reaction wall coupling ultrasonic waves and plant remediation, the groundwater in-situ remediation system comprises a multiple biological permeation reaction wall, a PLC control system and an artificial plant ecological remediation area, the multiple biological permeation reaction wall is arranged in a funnel-gate type engineering, the funnel part blocks the contaminated groundwater through a vertical cement curtain, an ultrasonic generator module is arranged in front of the gate part of the multiple biological permeation reaction wall, the multiple biological permeation reaction wall is divided into two layers, the filling material of the first layer permeation reaction wall is mainly composed of zero-valent iron, iron oxide and construction waste, the filling material of the second layer biological permeation reaction wall is mainly composed of high-performance biological adsorption zeolite and ORC slow-release material calcium peroxide, a microbial bacteria liquid injection pipe is arranged in the second layer biological permeation reaction wall, and monitoring wells are arranged on the two sides of the multiple biological permeation reaction wall and the artificial plant ecological remediation area.The application can treat and remediate multiple composite pollutants at a time, and the pollutant degradation efficiency is improved.

The invention discloses high-salt heavy metal wastewater advanced treatment equipment and method based on gradient purification, and relates to the field of wastewater treatment.The high-salt heavy metal wastewater advanced treatment equipment comprises a cyclone separation module, a conditioning module, a desalting module and a heavy metal advanced removal module which are sequentially connected in the wastewater treatment flow direction; the cyclone separation module, the conditioning module, the desalting module and the heavy metal deep removal module are all borne by a rigid rack and packaged through detachable sealing cover plates so as to form the integrated treatment equipment connected in series according to the treatment gradient. According to the treatment equipment and method, four wastewater treatment processes of physical separation, chemical conditioning, electrochemical desalination and biological adsorption are subjected to modular integration and gradient series connection, a step-by-step purification scheme from macroscopic treatment to microscopic treatment and from coarse treatment to fine treatment is constructed, pollutants can be efficiently separated before entering a core membrane unit, and the treatment efficiency is improved. The impact of the high-salt heavy metal wastewater on the membrane separation unit is fundamentally reduced.

The utility model discloses a wastewater treatment device based on a magnetic adsorbent, and aims to solve the problems that the existing electroplating wastewater treatment difficulty is high and the magnetic adsorbent is difficult to recover. According to the wastewater treatment device based on the magnetic adsorbent, a tank body of an adsorption reaction tank is cylindrical, a water decanter is arranged in the adsorption reaction tank, a first electromagnet device is arranged at the lower part of the cylindrical tank body of the adsorption reaction tank, and a second electromagnet device is arranged at the inverted conical tank bottom of the adsorption reaction tank; a first water outlet of the raw water tank is communicated with the adsorption reaction tank through a first water pipe, one end of a second water pipe is communicated with a second water outlet of the raw water tank, the other end of the second water pipe is communicated with a water inlet of the adsorption reaction tank, and a water injector is arranged on the second water pipe. Based on the magnetic separation characteristic of the magnetic composite adsorbent, the adsorption-magnetic separation reactor is designed, heavy metal wastewater is effectively treated, and meanwhile efficient separation and concentration of the magnetic biological adsorbent can be achieved through the electromagnet.

Provided herein is a process for the removal of micropollutants and / or other pollutants from water, involving subjecting the water to a consecutive combination of biological adsorbent filtration (BAF) followed by oxidation treatment (OT), preferably ozone treatment. In a preferred embodiment, an adjustable amount of the OT effluent, preferably an adjustable amount ranging between 10-100%, more preferably 20-90%, more preferably 20-80%, most preferably 20-50% of the OT effluent, is recirculated to the BAF. The process may involve monitoring the formation of oxidation products at the end of the OT, and / or for measuring TOC, DOC, SUVA, ammonium and / or specifically targeted pollutants in or at the end of the BAF, and controlling the amount of BAF-OT treated water which is recirculated to the consecutive steps of BAF and OT based on the output of the monitoring step.

The invention discloses a resource type sewage treatment system and method based on an MBBR process, and belongs to the field of sewage treatment. The system comprises a carbon source transfer and screening pretreatment unit, an MBBR biochemical treatment unit, a biological adsorption sludge acquisition unit and a mud-water deep separation unit which are sequentially connected, and further comprises a sludge return pipeline, a heat energy extraction unit, an EPS extraction unit and a sludge synergistic fermentation unit. The heat energy extraction unit can achieve whole-process sewage heat extraction, after the EPS extraction unit extracts EPS production environment-friendly materials, residual sludge returns to a fermentation system for secondary methane production, and gradient utilization of a carbon source is achieved. Through the integrated design of carbon source directional screening, sludge closed-loop backflow, mud-water deep separation characteristic adaptation and resource linkage recovery, the essential bottleneck of the prior art is broken, and synchronous synergism of sewage treatment and carbon, heat and material source recovery is achieved.

The present application relates to a kind of sewage advanced treatment high-performance biological filler and its preparation method, the biological filler includes nitrogen removal component, phosphorus removal component, inorganic carbon source component, active component, 2-5 parts filler reinforcing component, rare element component, pore-forming agent.The sewage advanced treatment high-performance biological filler of the present application does not need any organic adhesive agent and pore-forming agent, can simultaneously realize autotrophic denitrification, chemical phosphorus removal, heavy metal adsorption passivation, microorganism adsorption biofilm formation and other multiple functions, the physical property of filler is better, sewage treatment effect is significantly improved, and greatly reduces processing cost.

The application provides a method for cooperatively recovering copper in metallurgical sludge by bio-adsorption and complex breaking, comprising the following steps: 1) in a circulating system, pumping organic acid solution into a metallurgical sludge packed column and an ethylenediaminetetraacetic acid dianhydride modified bio-adsorbent packed column in sequence, and carrying out cyclic leaching; 2) after the cyclic leaching, adopting a calcination method to recover copper-based recovery materials adsorbed on the modified bio-adsorbent. The recovery process combining organic acid leaching and bio-adsorption complex breaking can realize efficient and selective leaching and recovery of copper ions under low acidity conditions; the recovery process is simple and convenient to operate, the organic acid complexing agent can be reused, the cost is low, and the method is suitable for popularization and application.

The invention discloses a method for rapidly detecting heavy metal pollution by utilizing microalgae based on a terahertz metamaterial sensor, which comprises the following steps of: acquiring terahertz frequency shift spectrograms of heavy metal stress microalgae with different concentrations on the basis of a biological adsorption mechanism of the microalgae and the terahertz metamaterial sensor; the analysis finds that the transmission peak of the microalgae at about 2.069 THz gradually moves to low frequency along with the increase of the heavy metal concentration, and a transmission peak frequency shift-heavy metal concentration quantitative relation curve graph is established.

This invention discloses a highly efficient integrated anaerobic ammonia oxidation reactor and treatment method for kitchen wastewater sludge, belonging to the field of wastewater treatment technology. The reactor includes a tank and integrated pretreatment module, denitrification reaction module, solid-liquid separation module, temperature control module, aeration module, and sludge circulation module. The pretreatment module is located at the bottom of the tank and includes a grid filter unit and a bio-adsorption unit; the denitrification reaction module is located above the pretreatment module and is filled with granular anaerobic ammonia oxidation composite bacteria; the solid-liquid separation module is located above the denitrification reaction module and includes a three-phase separator and an inclined plate sedimentation unit. This invention, through its integrated design, achieves pretreatment, denitrification reaction, solid-liquid separation, and precise control within a single tank, solving the problems of low integration, easy loss of bacteria, and high operating costs in existing technologies. It has advantages such as small footprint, high efficiency, stable operation, and no need for external carbon sources, making it particularly suitable for kitchen wastewater sludge treatment.

The application discloses a kind of sewage efficient biodegradation device, it is related to sewage treatment technical field, including processing jar, water inlet component, biological adsorption component and biological treatment agent feeding assembly.The application is processed by setting up processing jar, sewage can pass through biological adsorption component, biological adsorption film in biological adsorption component can carry out biological adsorption treatment to sewage, to reach the biological treatment of sewage, biological adsorption component is set to "U" shape structure, sewage can enter biological adsorption component in the intermittent mode, in the intermittent process of sewage delivery, sewage can be kept in biological adsorption component, so as to improve the processing effect of biological adsorption component to sewage, multiple biological adsorption components cooperate, in realizing the circulating delivery process of sewage, the biological treatment time of sewage is extended, so as to effectively improve the biological treatment effect of sewage.

The invention discloses a microbial electrolysis cell device and method for purifying phosphorus pollution by utilizing agricultural waste biochar. The device comprises an electrolytic tank main body (1) and a circulating system. The electrolytic tank main body (1) is of a single-chamber structure, and the constant-voltage power supply (12) is connected with the anode bar (2) and the cathode bar (3). And the cathode bar (3) adopts a composite structure of a permeable electrode shell (31) and a biochar electrode (32), so that the electrode is convenient to replace and recycle. The device can be further provided with a monitoring system and a reaction maintaining system, and automatic regulation and control are achieved. The method comprises the steps of microbial inoculation and biofilm formation, pretreatment feeding, calcium source supplementation, electrolytic adsorption coupling phosphorus removal, calcium phosphate recovery and the like, and efficient phosphorus removal and phosphorus resource recovery are achieved through the synergistic effect of electrochemistry and biological adsorption under the condition of low voltage (0.5-1.5 V). The method is suitable for treating multi-source phosphorus-containing wastewater in agriculture, industry, life and the like.

Pollution by phosphates affect aquatic life as they have side effects even at very low concentrations. Silica molybdate is prepared by first chlorinating silica sand using phosphorous pentachloride to give chlorinated silica which is aminated using ethylenediamine and thereafter treated with sodium molybdate. The molecular structure of the silica molybdate was characterized using Fourier Transform Infrared (FT-IR). FT-IR results showed Adsorption bands at 854cm-l and 542cm-l which were attributed to Mo=O and Mo-O stretching in molybdate. Peaks observed at 1388 and 1662cm-1 were attributed with the vibration mode of Mo-OH bond and bending mode of adsorbed water. Spectra peaks observed at 542, 634.58 and 898.97 cm-1 were attributed to the adsorption of molybdate. The physical adsorption parameters which were examined using batch adsorption system were; temperature, pH, contact, time, initial concentration using sorption models, adsorption kinetics and thermodynamics. Results showed that optimum pH for biosorption of P042- was 6.0, optimal contact time was 30 minutes, optimum temperature was 45°C. The experimental results obtained showed that the maximum phosphate adsorption of silica molybdate at optimum conditions was found to be 94.73% in water.

This invention provides a solid dosage product in the form of ammonia gas (NH3) bioadsorbent granules and a method for making it by utilizing the organic acid content of starfruit (Averrhoa bilimbi) extract. This bioadsorbent granule consists of a natural polymer carrier matrix component in the form of a combination of sodium alginate and gelatin composites with a weight ratio of 1:1, and an active substance in the form of starfruit extract of 15% w / w to the total weight of the matrix base. The manufacturing method is carried out through an ionotropic gelation technique by dissolving the polymer matrix, mixing the starfruit extract homogeneously using a magnetic stirrer at a speed of 500 rpm and a temperature of 40oC, then dripping the mixture into a 0.1 M calcium chloride (CaCl2) hardener solution to form a porous solid phase cross-link.Based on FTIR analysis, these granules have active sites in the form of functional groups –OH, C=O, and COO- that capture ammonia gas molecules through acid-base interactions into a stable form of ammonium ions (NH4+) and are strengthened by hydrogen bonds. The application of these granules is able to reduce ammonia gas emissions in open poultry farm waste areas with a reduction efficiency of up to 91.3% or until the ammonia level reaches 0 ppm.

The invention discloses a treatment method for phosphating wastewater metal ions, and belongs to the technical field of wastewater treatment. The phosphating wastewater metal ion treatment method comprises the following four steps: firstly, adding lime milk to adjust the pH value to 3.6-4, and adding H2O2 and Na2S to catalyze and coprecipitate to obtain pretreated wastewater; introducing into an electric floating tank, electrifying for 20-30 minutes by taking a cast iron plate as an anode and a ruthenium-coated titanium plate as a cathode, and separating floc by virtue of microbubbles; double columns with activated carbon loaded with strains are connected in series for treatment, and the bottoms of the carbon columns can be backwashed; finally, the saturated activated carbon is pyrolyzed in nitrogen, the activated carbon is recycled after being soaked in acid liquor, and metal is recycled through acid liquor electrolysis. The risk of heavy metal dissolution is solved through sulfide crystal lattice wrapping; the accurate control of the microbubble size ensures the efficient separation of the floc; and the problem of complex-state metal removal through biological-adsorption cooperation is solved. And the treatment of the phosphating wastewater is changed from up-to-standard discharge to resource recovery.

The application discloses a preparation method and application of a heavy metal adsorbent, and belongs to the field of waste resource utilization and water treatment technology. The preparation method comprises the following steps: preparing bone charcoal by taking animal bones as raw materials, modifying the bone charcoal by using a surfactant to prepare modified bone charcoal, and loading magnetic nano-particles on the modified bone charcoal to obtain a magnetic biological adsorbent capable of effectively removing heavy metal ions in sewage. The prepared adsorbent has good adsorption performance and biodegradability, does not cause secondary pollution to the environment, greatly reduces the harm of heavy metal ions in sewage, and the magnetism of the adsorbent itself is beneficial to the collection and recycling of the adsorbent, and the utilization rate of the material is improved.

This invention discloses an environmentally friendly filtration device for municipal drainage, comprising an influent pretreatment module for preliminary purification of raw water, a multi-stage composite filtration module for progressive interception and deep purification of pollutants through three-stage filtration, a sludge treatment module for reducing and rendering harmless the sludge generated during filtration, an intelligent control module for dynamically optimizing equipment operating parameters based on sensor data, and an energy recovery module for converting water flow potential energy and thermal energy into electrical or thermal energy for the device's own use. This invention achieves efficient pollution interception, low energy consumption, and resource recycling through integrated modular design. The multi-stage composite filtration module employs a three-stage synergistic mechanism of "cyclone separation - bio-adsorption - membrane filtration," combined with the dynamic parameter optimization of the intelligent control module and the kinetic / thermal energy conversion of the energy recovery module, solving the problems of low filtration efficiency, high energy consumption, and severe secondary pollution associated with traditional equipment.

The invention discloses a method for preparing 5N zinc by recovering waste zinc through combination of microbial adsorption and electrodeposition, and relates to the technical field of industrial wastewater treatment. According to the technical scheme, the method comprises the following steps: separating microbial strains from the zinc-containing industrial wastewater, and carrying out stress domestication to obtain high-selectivity adsorption bacteria so as to enrich zinc ions; microwave-assisted in-situ purification and electro-deposition coprocessing are realized through the nested reactor; the adsorption and electro-deposition process parameters are dynamically optimized by means of a multi-parameter self-adaptive regulation and control system; purifying a zinc product by adopting an electrolytic refining and zone melting coupling process; and recovering zinc resources from the microbial residues to prepare the bio-organic fertilizer. The method does not need the steps of genetic engineering strain modification and acid elution, reduces the loss of zinc ions, improves the purity of the electrodeposition raw material, stably prepares 5N-grade high-purity zinc, realizes resource utilization of microbial residues, forms a resource circulation closed loop, has both environmental protection benefits and economic benefits, and is suitable for high-valued treatment of zinc-containing industrial wastewater.

The invention discloses a cyanide-reducing bio-adsorbent as well as a preparation method and application thereof, and relates to the technical field of mining wastewater treatment. The cyanide-reducing bio-adsorbent comprises paenibacillus and an immobilized carrier, the paenibacillus is fixed on the immobilization carrier; the bacillus is preserved in China General Microbiological Culture Collection Center (CGMCC) on May 14, 2025, the preservation address is No. 3, No.1 yard, Beichen West Road, Chaoyang District, Beijing, and the preservation number is CGMCC No. 34545. The cyanide-reducing bio-adsorbent provided by the invention can be used for adsorbing and treating cyanide in mining wastewater, and has the advantages of high adsorption rate, stable structure, high adsorption capacity, low cost, recyclability and the like.

The invention discloses equipment and method for treating high-concentration organic wastewater through an MABR membrane combined with an MNB. The equipment comprises a water inlet, the outer wall of the right side of the water inlet is fixedly connected with a sedimentation tank, the interior of the sedimentation tank is fixedly connected with a connecting pipe, the outer wall of the connecting pipe is fixedly connected with an anaerobic tank, and the outer wall of the anaerobic tank is fixedly connected with an anoxic tank; a reaction tank is fixedly connected to the outer wall of the anoxic tank, a stirring tank is fixedly connected to the outer wall of the reaction tank, a driving mechanism is arranged in the stirring tank, a biological adsorption tank is fixedly connected to the outer wall of the stirring tank, and the outer walls of the lower sides of the sedimentation tank, the anaerobic tank, the anoxic tank and the reaction tank are fixedly connected to the interior of a sludge discharge plate; and micro / nano bubble-ultrasonic synergistic pretreatment is introduced between the sedimentation tank and the anaerobic tank, so that the biodegradability of the wastewater is improved and the toxicity is reduced under the actions of high-specific-surface-area bubbles, self-dissolving oxygenation and cavitation chain scission. The MABR membrane in the reaction tank forms an aerobic-anoxic-anaerobic gradient microenvironment in a bubble-free diffusion manner, so that efficient and synchronous nitrification and denitrification are realized.

The application discloses a microbial-based composite electrode and application thereof in purifying AMC wastewater, and belongs to the technical field of electrochemical water treatment, wherein the microbial-based composite electrode takes aspergillus niger spores as active material, takes Fe3O4 solid powder as catalytic material, and takes foam metal as a current collector matrix; the aspergillus niger spores are wrapped in the Fe3O4 solid powder to form aspergillus niger spore@Fe3O4 core-shell structure; the aspergillus niger spore@Fe3O4 core-shell structure is uniformly distributed in the three-dimensional porous structure of the foam metal through a bonding agent; and the microbial-based composite electrode can be used as a cathode to construct an electro-Fenton-biosorption coupling system and can be used for purifying AMC wastewater. The application utilizes the electro-Fenton-biosorption coupling technology, destroys the structure of an AMC complex through electro-Fenton oxidation, releases heavy metal ions, and realizes the adsorption of the heavy metal ions through the biosorption effect of the aspergillus niger spores, so that the AMC wastewater can be well degraded, the reaction system is stable, operation is convenient and controllable, there is no subsequent pollution problem, and the application has a good application prospect.

The invention discloses multi-stage cooperative treatment type wastewater purification equipment for production of caprylic capric triglyceride, and relates to the technical field of wastewater treatment equipment.The wastewater purification equipment comprises a base, a visual inspection platform, a case, a demulsification mechanism, an up-flow sludge pool and a biological membrane filter, and the demulsification mechanism comprises a pool body and a discharging mechanism; the visual inspection platform, the case, the tank body, the upflow sludge tank and the biological membrane filter are fixedly connected with the base, the discharging mechanism comprises a liquid discharging tank, the upflow sludge tank is connected with the liquid discharging tank and the biological membrane filter through pipelines, and the visual inspection platform and the demulsification mechanism are connected with the case through electric signals; whether demulsified oil drop flocculation adsorption is uniform or not and the scum removal rate are identified through visual inspection, the introduction distribution and rate of microbubbles are adjusted to enable rising microbubbles to uniformly wrap oil drops and flocculates, the scum removal rate is increased, and the purification efficiency is improved by performing multi-stage filtration in combination with material precipitation and biological adsorption.

The invention relates to the technical field of wastewater treatment, and particularly discloses a deep treatment method for industrial wastewater of a steel mill. The invention discloses an advanced treatment method for industrial wastewater of a steel mill. The advanced treatment method comprises the following steps: pretreatment: sequentially carrying out oil separation and air floatation treatment on wastewater; compound bacteria domestication treatment, wherein the compound bacteria are formed by compounding degrading bacteria, denitrifying bacteria and detoxifying bacteria; biochemical synergistic reaction: sequentially introducing the domesticated wastewater into an anaerobic reaction tank, an anoxic reaction tank and an aerobic reaction tank for treatment; deep purification: enabling effluent to enter an MBR (Membrane Bioreactor), and introducing into a biological adsorption column for further treatment; sludge reflux: partially refluxing the sludge generated by the MBR to the anaerobic reaction tank. According to the technical scheme provided by the invention, COD (Chemical Oxygen Demand), nondegradable organic matter phenol, ammonia nitrogen, total nitrogen and heavy metal chromium are efficiently and synchronously removed in the wastewater advanced treatment process, the treated water quality is stable and reaches the standard, and the sludge yield is remarkably reduced.

The invention belongs to the technical field of soil improvement, and particularly relates to an acidified soil improvement conditioner as well as a preparation method and application thereof. The preparation method of the soil conditioner comprises the following steps: (1) mixing chopped fresh stevia rebaudiana and oyster shell powder, and grinding to obtain a mixed fermentation substrate; (2) inoculating bacillus in the mixed fermentation substrate in the step (1) for fermentation culture to obtain an activated fermentation product; and (3) uniformly mixing the activated fermentation product obtained in the step (2) with a silicon-calcium-potassium-magnesium soil conditioner to obtain the acidified soil improvement conditioner. According to the preparation method, a mixed fermentation substrate of stevia rebaudiana and oyster shell powder is adopted, fermentation treatment is conducted through bacillus, a calcium source of the oyster shell powder can be activated, and the cadmium reduction effect on soil and planted crops is improved through biological EPS adsorption in a synergistic mode.