36results about How to "Improve nitrogen removal rate" patented technology

The invention relates to a method for removing SO2, NOx, heavy metal and particle of waste gas, wherein it comprises: using the common-temperature absorb liquid of nitrifying bacteria and sulfur oxidizing bacteria, in the biological absorb tower A, to be reacted with the waste gas, to transfer SO2, NOx, heavy metal and particle to liquid phase; then feeding the liquid and electric carrier to the anaerobic reactor B; under the condition that the pH value is 6.0-9.5, the temperature is 45-65Deg. C and the CODGr/S is 2-10, reducing sulfur into passive-two sulfur, reducing nitrogen into nitrogen gas, and transforming the heavy metal into sulfide deposition; then feeding the reacted water to the aerobic reactor C; under the condition that the pH value is 6.0-9.5, the temperature is 20-40Deg. C and the dissolved oxygen is 1.5-5mg/L, oxygenizing the sulfur selectively into single sulfur; the liquid separated from single sulfur is refluxed as the absorb liquid; for confirming there is enough nitrifying bacteria in the absorb liquid, keeping adding nitrifying bacteria.

The invention discloses a harmless treatment method and device for aluminum ash residues, wherein the aluminum ash residues comprise aluminum nitride. The harmless treatment method comprises the stepsthat water and a reactant are added into the aluminum ash residues for a nitrogen removal reaction to obtain aluminum ash residue turbid liquid, wherein the aluminum ash residue turbid liquid comprises ammonium salts and aluminum ash residues subjected to nitrogen removal, and the reactant comprises one or more of hydrogen peroxide, peracetic acid, calcium oxide, sodium carbonate, acetic acid anddilute sulfuric acid. According to the harmless treatment method and device for the aluminum ash residues, ammonia gas is avoided, the phenomenon that aluminum nitride is coated with aluminum hydroxide is avoided, the nitrogen removal rate is increased, and then the aluminum nitride in the aluminum ash residues is efficiently removed in a low-cost and harmless mode.

The invention provides an autotrophic denitrification deep denitrification device, and belongs to the technical field of wastewater deep denitrification. The device comprises an adjusting tank, a reactor and a sedimentation tank; a sludge discharge area is arranged at the bottom end in the reactor; a water distribution pipe is arranged above the sludge discharge area; a filter screen is arranged between the sludge discharge area and the water distribution pipe; a reaction area is arranged on the water distribution pipe; and a gas collection area is arranged above the reaction area. According to the device, an autotrophic denitrification biological filter bed is constructed, and types and proportions of fillers in the reaction area are optimized. The invention also discloses an autotrophicdenitrification deep denitrification method. The method optimizes the operation mode and operation condition and improves biological activity and denitrification capacity of autotrophic denitrification bacteria in a system, so that the starting time is shortened, and the denitrification effect of the system is enhanced. The autotrophic denitrification deep denitrification device has the characteristics of low energy consumption, quick reaction, no secondary pollution and the like, and solves the problems of long starting time, high sulfate radical concentration of outlet water, easy blockage,easy sulfur outflow and the like of an existing autotrophic denitrification technology in a process of treating low-carbon-source sewage.

The invention relates to the technical field of environmental engineering and aims to provide a zero emission treatment device and method for late-stage landfill leachate. The device and method can improve overall reaction efficiency of partial nitrification-anaerobic ammonia oxidation, realize zero emission treatment of the landfill leachate and remove phosphorus, organic matters and heavy metalions in the landfill leachate. According to the technical scheme, the zero emission treatment device for late-stage landfill leachate is characterized by comprising a regulating tank unit, a partial nitrification-anaerobic ammonia oxidation integrated reactor unit, a carbonization tank unit, a denitrification tank unit, a spirulina-nitrification tank unit, a sedimentation tank, a membrane filtration system unit and an intelligent control system, wherein the partial nitrification-anaerobic ammonia oxidation integrated reactor unit comprises a partial nitrification tank unit and an anaerobic ammonia oxidation reactor unit; the spirulina-nitrification tank unit comprises a spirulina tank unit and a nitrification tank unit; the membrane filtration system unit comprises a microfilter, a nanofilter and an ultrafilter.

The invention discloses an aerobic synchronous nitrification and denitrification biofilm process for treating nitrogen-polluted water. A biofilm carrier is prepared and cultured to obtain a synchronous nitrification and denitrification biofilm, wherein the biofilm carrier is prepared from 70-80% of a degradable fiber carrier and 20-30% of a modified mussel shell. The biofilm process disclosed by the invention has the beneficial effects that based on the property of a solid phase carrier for slow release of a carbon source, the control capability to the carbon source is good, physical and chemical adsorption capabilities are good, the biofilm formation speed is highfast, and the formed biofilm has a large specific surface area. According to the Tthe formed gelatinous biofilm, is characterized in that a dissolved oxygen gradient is gradually formed from the surface to the inside, the surface of the gelatinous biofilm is in an aerobic state, the middle part is facultative, the inside isin an anaerobic state, and thus a relatively independent aerobic-facultative-anaerobic unit is formed, namely that a plurality of A2O units are further formed in the overall aerobic environment insidethe BAF, and heterotrophic synchronous nitrification and denitrification can be realized.

The invention discloses a quick starting method of short-cut nitrification and denitrification of a wastewater treatment system. The method includes the following steps: (1) inoculating aerobic active sludge into a reactor and adding a growth accelerator A; (2) starting the system firstly in an intermittent water feeding manner and then in a continuous water feeding manner; (3) during intermittent operation, when concentration of suspensions in discharged water is lower than 100 mg/L, stopping addition of the growth accelerator A and adding denitrifying bacterial agent and a growth accelerator B; (4) when the ammonia nitrogen in inlet water reaches 400-700 mg/L and removal rate reaches more than 60% within 12 h, changing the operation into continuous water feeding, and adding the denitrifying bacterial agent and the growth accelerator B; and (5) when removal rate of total nitrogen reaches more than 70%, increasing the concentration of ammonia nitrogen until the ammonia nitrogen in inlet water reaches 500-1000 mg/L and the removal rate of total nitrogen reaches more than 80%, and at this time, completing the starting process. The method greatly reduces starting difficulty of short-cut nitrification and significantly reduces operation time, and ensures long-time stable operation of the reactor. The method has high treatment efficiency on wastewater, and can achieve simultaneous removal of ammonia nitrogen, total nitrogen and COD.

The invention relates to a method for improving the denitrification performance of an anaerobic ammonia oxidation system by adding biochar. The method comprises the following steps: 1, preparing sawdust biochar; 2, adding the wood chip biochar obtained in step 1 into an anaerobic ammonia oxidation biological denitrification system; and 3, after the matrix is consumed, recycling the biochar in the system. According to the invention, the electron transfer process of microorganisms is improved by using the oxidation-reduction characteristic of biochar, so that the conversion of nitrate nitrogen is promoted, the problem of nitrate nitrogen accumulation in the anaerobic ammonia oxidation system is successfully solved, the denitrification performance of the system is improved, and the efficient and stable operation of the system is realized. The biochar is prepared from waste biomass, and resource utilization of biomass waste can be achieved while efficient denitrification is achieved.

The invention discloses a sulfur-based autotrophic microorganism nitrogen removal material as well as a preparation method and an application method thereof. The autotrophic nitrogen removal material is a particulate matter obtained by mixing a sulfur-containing raw material with lime powder and then carrying out melting, forming and surface carbonation. The autotrophic nitrogen removal material disclosed by the invention is used as a filler of an anaerobic biological filter to construct a deep anaerobic biological filter bed, the nitrogen content of 25mg/L nitrate and nitrite can be reduced to be less than 5mg/L under the conditions that the hydraulic retention time is 40-60min at a proper temperature, the material disclosed by the invention is used for replacing an organic matter carbon source such as sodium acetate for nitrogen removal by denitrification, and the nitrogen removal cost is saved by more than 50%.

The invention relates to a composite biological denitrification wastewater treatment device, and belongs to the technical field of wastewater treatment. The wastewater treatment device comprises a vertically arranged reactor body, wherein a three-phase separator is arranged in the reactor body and divides the reactor body into an upper layer and a lower layer, the upper layer is a biological membrane area, the lower layer is a granular sludge area, the lower end of the reactor body is a water inlet end, and the upper end of the reactor body is a water outlet end; a water inlet component, wherein the output end of the water inlet component is connected and communicated with the water inlet end of the reactor body; a heating part, wherein the output end of the heating part is connected with the reactor body, and the heating part is used for heating the reactor body; and an aeration part, wherein the output end of the aeration part is communicated with the biological membrane area. The wastewater treatment device adopts biological nitrogen removal, has efficient nitrogen removal capacity, has high efficiency and strong impact load resistance, and synchronously improves the treatment effect and stability.

According to the method, hydroxide denitrifying bacteria and anaerobic ammonium oxidation bacteria are adopted for combined denitrification, ammonium radicals and nitrate radicals in wastewater are converted into nitrogen, nitrate nitrogen and ammonia nitrogen in the wastewater are deeply removed at the same time, an organic carbon source does not need to be additionally added, and complete autotrophy is achieved; the system can be operated for a long time, the total nitrogen in the effluent of the bioreactor is less than or equal to 1mgN/L, and the water quality can reach the surface water class III standard.

The invention provides a device and method for treating urban sewage by using a two-stage SPNA denitrification process, aims at the problems of poor denitrification effect, low denitrification load and the like existing in a prior urban sewage SPNA process, and belongs to the field of sewage biological treatment. The method is characterized in that two SPNA reactors are arranged in series. The sewage enters a first-stage SPNA reactor to carry out short-cut nitrification-Anammox reaction to remove 60-80% of ammonia nitrogen in the sewage, subsequently, the effluent from the first-stage SPNA reactor enters a second-stage SPNA reactor via an intermediate water tank. The second-stage SPNA reactor operates under intermittent aeration conditions to further remove residual ammonia nitrogen and complete the denitrification reaction. The two SPNA reactors operate under the conditions of high nitrogen load and intermittent aeration respectively, which is beneficial to inhibiting NOB and enriching Anammox bacteria, the denitrification rate is high, the operation parameters of the two SPNA reactors can be flexibly adjusted according to the quality of inlet water, the quality of outlet water isensured, the method has the advantages of high nitrogen removal rate and good denitrification effect, strong impact load resistance, simple operation and energy saving.