36results about How to "Efficient phosphorus removal" patented technology

The invention discloses a piggery wastewater advanced treatment and resource recycling method. The method comprises the following steps: (1) adding water into a mixed metal salt and dissolving to obtain a coagulant solution; (2) regulating the pH of the piggery wastewater to alkalinity to obtain piggery wastewater I; (3) adding biochar into the piggery wastewater I obtained in the step (2), and stirring to obtain piggery wastewater II; (4) adding the coagulant solution obtained in the step (1) into the piggery wastewater II obtained in the step (3), stirring, standing, and performing solid-liquid separation, wherein the upper layer is the treated piggery wastewater III, and the lower layer is coagulated sludge. The method provided by the invention realizes a good advanced treatment effect on the piggery wastewater and can effectively remove phosphorous and COD; meanwhile, the recycled coagulated sludge can serve as a potassium-phosphorous organic compound fertilizer, and resource utilization is realized; moreover, the process is simple and stable, the production cost is low, and large-scale application is easy to realize.

The invention relates to an integrated biological treatment process for simultaneously performing short-cut nitrification anaerobic ammonium oxidation and phosphorus removal in an intermittent aeration mode, belonging to the technical field of biological sewage treatment. The process is implemented in an integrated reactor for simultaneously realizing short-cut nitrification anaerobic ammonium oxidation and phosphorus removal. Three microbial florae, i.e., ammonia oxidizing bacteria (AOB), phosphorus accumulating organisms (PAOs) and anaerobic ammonium oxidation bacteria mainly exist in the integrated reactor, wherein the AOB and the PAOs exist in a floc form, and the anaerobic ammonium oxidation bacteria exists in a granular form. The municipal domestic sewage directly enters the integrated reactor without being subjected to decarburization pretreatment; the integrated reactor effectively inhibits the activity of nitrite oxidizing bacteria by means of an intermittent aeration operation mode, and can provide a carbon source and an electron donor for strengthening biological phosphorus removal in a process of autotrophic nitrogen removal of short-cut nitrification anaerobic ammoniumoxidation so as to achieve the zero addition of an additional carbon source. The integrated reactor for simultaneously realizing short-cut nitrification anaerobic ammonium oxidation and phosphorus removal can effectively retain anaerobic ammonium oxidizing bacteria particles and simultaneously washing out fine phosphate-rich floc sludge by using a screening method in a draining process.

The invention belongs to the field of environmental functional materials, and particularly relates to a method and a device for treating hypophosphites and phosphites in wastewater. The method specifically comprises the following steps: adding hydrogen peroxide into wastewater containing hypophosphites and phosphites, and carrying out pre-oxidation to transform the hypophosphites into phosphites;and after the pre-oxidation, adding a magnesium-aluminum layered composite oxide to adsorb the phosphites. The device comprises a pre-oxidation reaction tank, an adsorption reaction tank, a hydrogen peroxide injection part and a magnesium-aluminum layered composite oxide feeding part, wherein the hydrogen peroxide is injected into the pre-oxidation reaction tank through the hydrogen peroxide injection part for carrying out a pre-oxidation reaction, and the magnesium-aluminum layered composite oxide is fed into the adsorption reaction tank through the feeding part for adsorbing the phosphites.According to the invention, the hypophosphites are transformed into the phosphites by utilizing the hydrogen peroxide, and then the novel and efficient treatment to the hypophosphite and phosphite wastewater is realized through the utilization of excellent adsorption performance of calcinated hydrotalcite to phosphites. The invention is of great significance to the treatment of electroplating hypophosphite and phosphite wastewater which is difficult to treat.

The invention relates to a device and method for realizing synchronous short-range nitrification and denitrification combined with anaerobic ammonium oxidation to treat low-carbon urban sewage by alternation of aerobic deficiency, which belongs to the field of sewage biological treatment. The device includes a raw water tank, an intermediate water tank, a sequencing batch SBR reactor, an upflow anaerobic sludge bed reactor, an air compressor, a peristaltic pump, etc. The method is to add domestic sewage into the first sequence batch reactor, realize synchronous short-range nitrification and denitrification under the anoxic / aerobic / anoxic operation mode, and remove all degradable COD and part of total inorganic nitrogen; its drainage enters through the intermediate water tank In the upflow anaerobic sludge bed reactor, the ammonia nitrogen and nitrous oxide in the wastewater are removed through anaerobic ammonium oxidation reaction, and finally the deep nitrogen and phosphorus removal of domestic sewage is realized. The invention is suitable for low C / N urban domestic sewage, can reduce aeration, reduce energy consumption, provide an effective means of carbon separation, slow down the consumption speed of organic matter, improve the efficiency of nitrogen and phosphorus removal, and realize the reduction of excess sludge at the same time change.

An anaerobic-aerobic process control method for the efficient phosphorus removal and nitrogen reservation of municipal domestic sewage belongs to the municipal domestic sewage processing and recycling fields. A complete sewage regeneration flow represented by using anaerobic-aerobic processes to remove phosphorus and organic matters and using an autotrophic nitrogen removal technology to remove nitrogen is an effective approach for realizing the low-carbon and high-efficiency processing of the sewage; and the subsequent autotrophic nitrogen removal technology has no phosphorus removal function and treats ammonia nitrogen as inlet water, so the total phosphorus content of the outlet water of the anaerobic-aerobic process in the complete flow is less than 0.5mg / L and reaches a first order A standard, and nitrogen reservation, no conversion and low loss are reached. The anaerobic-aerobic process efficient phosphorus removal and low nitrogen operation is realized through treating the domestic sewage as base water, carrying out gradient oxygen limitation, strictly controlling the sludge age and inhibiting ammoxidation and denitrification through providing the anaerobic-aerobic process control parameters at different temperatures under a normal temperature condition.

The present invention relates to a Pseudomonas putida P.PAO-1 with the function of removing phosphorus and a method for acclimating it. The preservation number of the Pseudomonas P.PAO-1 is: CGMCC No.8073, nucleoside The acid sequence is shown in SEQ ID NO.1. Cultivation: Inoculate Pseudomonas putida P.PAO-1 strains into 5-10ml sterilized enrichment medium for pre-culture, and then inoculate into 100-200ml sterilized enrichment medium, at 30°C , shake culture for 12‑24 hours, wash, centrifuge, and resuspend to form a bacterial liquid; then carry out anaerobic and aerobic alternate cultivation and domestication to obtain domesticated bacteria. The present invention adopts enrichment-domestication two-stage culture mode culture to form initial accumulation of polyhydroxybutyric acid in the P.PAO-1 strain, and is applied to the treatment of low-concentration carbon-containing organic wastewater to achieve the purpose of efficient phosphorus removal.

Belonging to the field of environmental pollution control, the invention provides an adsorbent for anion and cation adsorption and a preparation method thereof. Specifically, the preparation method includes the steps of: adding a lanthanum salt into a weakly acidic magnetite solution, and adding alkali to adjust the magnetite solution to alkaline, mixing the substances evenly, then conducting washing with water to neutral, and the carrying out dehydration, calcination and grinding. The adsorbent has a core-shell structure, and comprises a magnetic composite material and lanthanum hydroxide loaded to the composite material. The composite material includes ferrihydrite coated magnetite. The adsorbent provided by the invention has high efficiency adsorption capacity on anions and cations, also is low in preparation cost, and is easy for separation. The preparation method provided by the invention is simple and has low energy consumption, the prepared sample is magnetic and is easy to separate, at the same time, the preparation process is a liquid phase reaction process, has no need for harmful reagent, and is easy for large-scale preparation. And the adsorbent has wide application prospects in the field of pollution control.