3454 results about "Total nitrogen" patented technology

A process for manufacturing a lubricating base oil by: a) performing Fischer-Tropsch synthesis on syngas to provide a product stream; b) isolating from said product stream a substantially paraffinic wax feed having less than about 30 ppm total nitrogen and sulfur, and less than about 1 wt % oxygen; c) dewaxing said feed by hydroisomerization dewaxing using a shape selective intermediate pore size molecular sieve comprising a noble metal hydrogenation component, wherein the hydroisomerization temperature is between about 600° F. (315° C.) and about 750° F. (399° C.), to produce an is dimerized oil; and d) hydrofinishing said isomerized oil to produce a lubricating base oil having specific desired properties.

A process for manufacturing a finished lubricant by: a) performing Fischer-Tropsch synthesis on syngas to provide a product stream; b) isolating from said product stream a substantially paraffinic wax feed having less than about 30 ppm total nitrogen and sulfur, and less than about 1 wt % oxygen; c) dewaxing said feed by hydroisomerization dewaxing using a shape selective intermediate pore size molecular sieve comprising a noble metal hydrogenation component, wherein the hydroisomerization temperature is between about 600° F. (315° C.) and about 750° F. (399° C.), to produce an isomerized oil; and d) hydrofinishing said isomerized oil, whereby a lubricating base oil is produced having specific desired properties; and e) blending the lubricating base oil with at least one lubricant additive.

An inclined plate coupled membrane bioreactor for treating feed water having excessive level of nutrients in particular chemical oxygen demand and total nitrogen and suspended solids has an aerobic bioreactor for nitrification and aerobic biodegradation in which membranes are submerged for permeate extraction, and an anoxic bioreactor for denitrification within which the inclined plates are outfitted to confine as much anoxic sludge as possible. An air oxygenating and an air scouring are continuously provided to the aerobic bioreactor to maintain a desired aerobic environment and to mitigate membrane fouling while an intermittent air blowing is provided to the anoxic bioreactor to blow out gaseous content generated through denitrification and to rectify the uniformed flow along the inclined plates. The aerobic sludge is recycled to the lower compartment of anoxic bioreactor and the supernatant of anoxic bioreactor is collected as weir effluent and delivered to the downstream aerobic bioreactor. Permeate is intermittently extracted from the membranes by a suction pump. There is no excess sludge withdrawn from the inclined plate coupled membrane bioreactor throughout the experiment.

This invention discloses a method for deep denitrification treatment of high-concentration organic wastewater. The apparatus comprises an anaerobic decarbonization zone, an aerobic nitrosation / anaerobic ammoxidation denitrification zone, and a traditional nitrification / denitrification zone. In the anaerobic decarbonization zone, an anaerobic bioreactor is utilized to perform anaerobic biotreatment on the organic pollutants in raw water to remove the majority of organic matters. In the aerobic nitrosation / anaerobic ammoxidation denitrification zone, ammonia nitrogen and nitrite nitrogen are removed in the form of nitrogen gas. In the traditional nitrification / denitrification zone, nitrate in the water discharged from the aerobic nitrosation / anaerobic ammoxidation denitrification zone is subjected to denitrification and removed in the form of nitrogen gas. Excess organic matters are subjected to aerobic bioreaction and removed. The method can ensure COD; total nitrogen and ammonia nitrogen contents in the treated water are qualified for discharge. The method has such advantages as high decarbonization and denitrification efficiency, low energy consumption, and high running stability.

The invention relates to the technical field of chemical engineering, and particularly relates to a production method for monoammonium phosphate. A monoammonium phosphate product is prepared by directly subjecting high pure urea phosphate and ammonia to a double decomposition reaction and reacting for 20-60 min with stirring by controlling a reaction temperature at 40-80 DEG C and a pH value at a reaction endpoint being 4.2-4.6, and through the steps of cooling for crystallization; separating by centrifugation and drying. Measurements of physical and chemical indexes of the produced product show that the physical and chemical indexes of the produced monoammonium phosphate product meet an industrial first level standard. Specifically, the total nutrient content of monoammonium phosphate is higher than 73%; the content of total nitrogen is 12.01-12.23%; the content of phosphorus pentoxide is 61.05-61.25%; the content of moisture is 0.35-0.52%; a pH value is 4.2-4.6; the content of water insoluble materials is 0.090-0.096%; and the content of fluoride is 0.15-0.19%.

The invention relates to aerobic denitrifying paracoccus denitrificans and application thereof. A bacterial strain provided in the invention is paracoccus denitrificans DN-3CGMCC No. 3658; the Paracoccus denitrificans can carry out aerobic denitrification by using nitrate nitrogen under both aerobic and oxygen-limited conditions and can also carry out heterotrophic nitrification-aerobic denitrification by using ammonia-N, and a total nitrogen removal rate on above mentioned occasions is greater than 90%. The paracoccus denitrificans provided in the invention has stable hereditary features, isapplicable to treatment of a variety of nitrogen-containing waste water and produces a good nitrogen removal effect.

A single crystal CVD synthetic diamond material comprising: a total as-grown nitrogen concentration equal to or greater than 5 ppm, and a uniform distribution of defects, wherein said uniform distribution of defects is defined by one or more of the following characteristics: (i) the total nitrogen concentration, when mapped by secondary ion mass spectrometry (SIMS) over an area equal to or greater than 50×50 μm using an analysis area of 10 μm or less, possesses a point-to-point variation of less than 30% of an average total nitrogen concentration value, or when mapped by SIMS over an area equal to or greater than 200×200 μm using an analysis area of 60 μm or less, possesses a point-to-point variation of less than 30% of an average total nitrogen concentration value; (ii) an as-grown nitrogen-vacancy defect (NV) concentration equal to or greater than 50 ppb as measured using 77K UV-visible absorption measurements, wherein the nitrogen-vacancy defects are uniformly distributed through the synthetic single crystal CVD diamond material such that, when excited using a 514 nm laser excitation source of spot size equal to or less than 10 μm at room temperature using a 50 mW 46 continuous wave laser, and mapped over an area equal to or greater than 50×50 μm with a data interval less than 10 μm there is a low point-to-point variation wherein the intensity area ratio of nitrogen vacancy photoluminescence peaks between regions of high photoluminescent intensity and regions of low photolominescent intensity is <2× for either the 575 nm photoluminescent peak (NV0) or the 637 nm photoluminescent peak (NV); (iii) a variation in Raman intensity such that, when excited using a 514 nm laser excitation source (resulting in a Raman peak at 552.4 nm) of spot size equal to or less than 10 μm at room temperature using a 50 mW continuous wave laser, and mapped over an area equal to or greater than 50×50 μm with a data interval less than 10 μm, there is a low point-to-point variation wherein the ratio of Raman peak areas between regions of low Raman intensity and high Raman intensity is <1.25×; (iv) an as-grown nitrogen-vacancy defect (NV) concentration equal to or greater than 50 ppb as measured using 77K UV-visible absorption measurements, wherein, when excited using a 514 nm excitation source of spot size equal to or less than 10 μm at 77K using a 50 mW continuous wave laser, gives an intensity at 575 nm corresponding to NV0 greater than 120 times a Raman intensity at 552.4 nm, and / or an intensity at 637 nm corresponding to NV− greater than 200 times the Raman intensity at 552.4 nm; (v) a single substitutional nitrogen defect (Ns) concentration equal to or greater than 5 ppm, wherein the single substitutional nitrogen defects are uniformly distributed through the synthetic single crystal CVD diamond material such that by using a 1344 cm−1 infrared absorption feature and sampling an area greater than an area of 0.5 mm2, the variation is lower than 80%, as deduced by dividing the standard deviation by the mean value; (vi) a variation in red luminescence intensity, as defined by a standard deviation divided by a mean value, is less than 15%; (vii) a mean standard deviation in neutral single substitutional nitrogen concentration of less than 80%; and (viii) a colour intensity as measured using a histogram from a microscopy image with a mean gray value of greater than 50, wherein the colour intensity is uniform through the single crystal CVD synthetic diamond material such that the variation in gray colour, as characterised by the gray value standard deviation divided by the gray value mean, is less than 40%.

The invention discloses a sewage-disposal soft measurement method on the basis of an integrated neural network, and belongs to the field of sewage disposal. A sewage disposal process is high in nonlinearity, time-varying characteristics and complexity, and measurement for key water quality indexes is crucially significant in control of water pollution. In order to improve precision of simultaneous soft measurement for various key water quality parameters in a sewage-disposal soft measurement process by the sewage-disposal soft measurement method, an integrated neural network model is provided for measuring COD (chemical oxygen demand) of outlet water, BOD (biochemical oxygen demand) of the outlet water and TN (total nitrogen) of the outlet water, coupling relation between the three key water quality parameters is sufficiently utilized in the model, the integrated neural network model contains three feedforward neural sub-networks, and the various neural sub-networks are trained by particle swarm optimization, so that the optimal structure of each neural sub-network can be obtained. The COD of the outlet water, the BOD of the outlet water and the TN of the outlet water are predicted by the trained neural network finally, and prediction results are accurate.

The invention discloses a novel compound microorganism living bacteria agent. The agent comprises probiotics such as pediococcus, saccharomyces, bacillus and the like, wherein the total bacterial quantity is above 107 colony-forming units (cfu) / gram. The invention further discloses a method for preparing the novel compound microorganism living bacteria agent and applications of the novel compound microorganism living bacteria agent in preparation of organic sewage purification additives, deodorization fly dispelling agents, degreasing agents, pipeline blockage removing agents, feed additives and microorganism disease prevention agents. The novel compound microorganism living bacteria agent has the comprehensive effects of high removal rates to ammonia nitrogen, total nitrogen and total phosphorus, small sludge residues, energy saving, environmental friendliness and the like and the characteristics of convenience in use, safety and quickness in function, no secondary pollution, benefits to ecological protection, low treatment cost, good comprehensive profit and the like.

The invention discloses a large-scaled culture method of high-concentration nitrosobacteria and application thereof. The method comprises the following steps of: (1) adding an enrichment culture solution with initial ammonia nitrogen mass concentration of 30-500mg / L in a reaction device with functions of stirring, heating and aeration; preparing activated sludge of a waste water treatment plant in activated sludge of 0.5-20% for primary inoculation to conduct the enrichment culture of the nitrosobacteria by 2-6d as a culture cycle, wherein extra ammonium salts and a growth promoter are added during the enrichment culture of the nitrosobacteria; (2) ending the culture when the concentration of NO2-N in the solution is accumulated to reach 70-95% of the concentration of total nitrogen; adding a flocculating agent for flocculation and sedimentation; and allowing to stand still to remove supernate, and then adding the enrichment culture solution to start the culture of the second cycle; and (3) continuously conducting 3-8 cycles of the enrichment culture to obtain the high-concentration nitrosobacteria. By adopting the nitrosobacteria to strengthen the bi-nitrification treatment of ammonia nitrogen contained waste water, the method has the advantages of high stress resistance, low cost and high efficiency and is suitable for the complicated treatment of ammonia nitrogen contained industrial waste water.

The invention belongs to the environmental microorganism field, and in particular relates to a heterotrophic nitrification microorganism agent, a method for cultivating the same, and a use of the same in culture wastewater treatment. The microorganism agent contains Stenotrophomonas maltophilias strain DN1.1 and Pseudomonas putida strain DN1.2 which have the preservation registration numbers respectively as CCTCC M 207074 and CCTCC M 207075. The microorganism agent can effectively remove ammonia nitrogen and total nitrogen in a water body, accumulates no nitrite or nitrate during denitrification, and can simultaneously remove CODCr in organic wastewater, which is applicable to the treatment of high-concentration culture wastewater. The use of the microorganism agent in treating culture wastewater is simple in process and stable in effect.

An embodiment of the invention discloses a hyper-spectral estimation model constructing method of total nitrogen content of rice leaves. The method comprises steps as follows: multiple experimental plots are selected, and multiple sampling points are selected in each experimental plot; canopy spectral measurement is performed at the critical growing stage of rice; multiple sampling spectrums are recorded at each sampling point, and an average value is taken as a spectral measurement value of the sampling point; a hyper-spectral image of each experimental plot is acquired by an airborne imaging spectrometer; multiple function leaves at different parts are collected at each sampling point, and the total nitrogen content of the rice leaves is measured; the hyper-spectral estimation model of the total nitrogen content of the rice leaves is constructed with the adoption of spectral indexes or a partial least-squares regression method. The embodiment of the invention further discloses a hyper-spectral estimation method of the total nitrogen content of the rice leaves. The total nitrogen content of the rice leaves is estimated according to the model constructed with the method. The scientific and technical basis can be provided for space inversion of the nitrogen content of regional-scale rice and efficient implementation of precision agriculture.

The invention discloses a method for preparing expanded tobacco stem particles and the equipment thereof. The method is characterized in that the method can control the mixed ratio of tobacco stems on the basis of raw material analysis. The method comprises the following steps: mixing materials to obtain tobacco stem containing 10 to 18%of total sugar, 8 to 16% of reduced sugar, 0.3 to 1.5% of nicotine, and 1.0 to 2.0% of total nitrogen, extracting, expanding, storing, regaining moisture, granulating, recovering, shaping, cleaning and air-sorting, flavoring, and balancing to obtain the required expanded tobacco stem particles. The invention eliminates the influences of material difference on the quality of the expanded tobacco stem particles to ensure the stability and the uniformity of the product quality, thus improving the utilization rate of the tobacco stem and further improving the production process of the expanded tobacco stem particles. The method has the advantages of simple, reasonable and easy process flow, stable equipment operation, high efficiency, low energy loss, and good application prospect.

A process for the extractive oxidation of contaminants from raw hydrocarbon streams rich in heteroatomic polar compounds is described, the said process involving the extractive oxidation of sulfur and nitrogen compounds from said streams, the said process comprising treating said streams with a peroxide solution / organic acid couple, the weight percent of the peroxide solution and organic acid based on raw hydrocarbon being at least 3 for both the peroxide and organic acid solution, under an acidic pH, atmospheric or higher pressure and ambient or higher temperature. As a result of the reaction, the oxidized heteroatomic compounds, having strong affinity for the aqueous phase, are extracted into said aqueous phase, while the oxidized hydrocarbon is neutralized, water washed and dried, the resulting end product being a hydrocarbon stream from which have been removed 88.1 wt % or more of total nitrogen compounds and basic nitrogen up to 99.1 wt %, both calculated as mass contents, total Sulfur 23.3% removal, and removal of total olefins is limited to 6.5 weight %. The treated product is further directed to any refining process.

The invention belongs to the technical field of water treatment and particularly relates to a method and a system for advanced treatment of centralized rural domestic sewage. The treatment system comprises a hydrolytic acidification tank, a composite tower type ecological filter and a surface flow artificial wetland system. The treatment method comprises the following steps of: collecting sewage through a pipe network, allowing the sewage to enter the hydrolytic acidification tank which is a landfill tank, stabilizing and regulating the water quantity, and pumping the sewage into a high-position service reservoir by using a submersible electric pump with the head of more than 5m; distributing the domestic sewage of the hydrolytic acidification tank into the composite tower type ecological filter by strengthening water distribution measures, and removing organic pollutants, total nitrogen, ammonia nitrogen, total phosphorus and pathogenic microorganisms in the sewage; and allowing tail water and collected rainfall runoff to enter the artificial wetland system for advanced treatment. A good water environment landscape can be built for an artificial wetland; and the effluent reaches the first-grade A standard of discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002).

The invention discloses an integrated pre-denitrification and denitrogenation biological filter sewerage treatment process. The integrated process is characterized in that: the process is realized by combining an anoxic denitrification biological filter and an aerobic nitrification biological filter in tandem, first, sewage with organic substances and ammonia nitrogen is mixed with part of effluent water of the aerobic nitrification biological filter which flows back to a water inlet end, then the sewage and the effluent water pass the anoxic denitrification biological filter together, and the organic substances in the sewage are taken as a carbon source by denitrifying bacteria adhesively growing on bio-ceramsite in the anoxic denitrification biological filter to reduce nitrate nitrogen from the return water of the aerobic nitrification biological filter into nitrogen gas, thus realizing denitrification function; and the effluent water of the anoxic denitrification biological filter flows to the aerobic nitrification biological filter, and a filter material in the aerobic nitrification biological filter is adhered with special growing aerobic decarbonization microbes and the growing denitrifying bacteria which further degrade the organic substances and the ammonia nitrogen from the anoxic denitrification biological filter, thus causing content indicators of the organic substances, the ammonia nitrogen, total nitrogen and the like in the effluent water of the aerobic nitrification biological filter to meet the discharge requirement.

The invention relates to a density forecast method of the chlorophyll a stemmed from a water body of the BP neural network. The density forecast method comprises the following steps: (1) the chlorophyll a in the tested water body and the value of other correlative water quality index which influences the chlorophyll a are acquired as the examination data. (2) The neural network of an error back propagation is established. (3) The neural network is trained and tested. (4) The neural network which passes the test is utilized to forecast the chlorophyll a in the water body. Other water qualities which influence the chlorophyll a are: Ammonia nitrogen, total nitrogen, total phosphorus, orthophosphate, permanganate index, temperature, dissolved oxygen, pH, suspension, five-day biochemical oxygen demand. The step (1) also comprises a normalization process. The data of the chlorophyll a and other ten water quality indexes are between -1 and +1 after the data of the chlorophyll a and other ten water quality indexes are normalized. The neural network comprises an input layer, an intermediate layer and an output layer. The invention can establish a forecast model related to the chlorophyll a, just needing the experiment which has the limited times. The chlorophyll in the river can be accurately and quickly forecasted through the computer simulation experiment and the science forecast.

A monitoring of catalytic cracking processing is provided which uses near infrared (NIR) analysis to characterize cracking feeds, intermediates and products for chemical and physical properties such as saturates, monoaromatics, diaromatics, triaromatics, tetraaromatics, polar aromatics, total aromatics, thiophenes, distillation points, basic nitrogen, total nitrogen, API gravity, total sulfur, MCRT and % coker gasoil and the resulting characterization thereof. The NIR results can be used in FCC simulation software to predict unit yields and qualities.

The present invention discloses a short-cut nitrification-denitrification microbial agent. The microbial agent contains Arthrobacter creatinolyticus FDN 1, Flavobacterium mizutaii FDN 2, Paracoccus denitrificars DN 3 and Methylobacterium phyllosphaerae SDN3. The preservation register numbers of the four strains respectively are CGMCC No.3657, CGMCC No.3659, CGMCC No.3658 and CGMCC No.3660. With the microbial agent, the ammonia nitrogen removing, the total nitrogen removing and the CODcr removing in the same reactor can be achieved, the wastewater treatment effect is good, and the microbial agent is especially suitable for the purification treatment of the wastewater containing the ammonia nitrogen so as to really achieve the short-cut nitrification-denitrification or simultaneous nitrification and denitrification.

Disclosed is a comprehensive treatment method of livestock and poultry breeding wastewater, which adopts the following three steps that: firstly, an upflow anaerobic sludge blanket treater (3) is used for anaerobic biological treatment and killing bacteria and viruses. Secondly, an improved moving bed biomembrane treater (6) is used for aerobic biological treatment, a longitudinal clapboard (12) is added into the treater (6) to partition the treater into an aerobic zone (13) and a solid-liquid separation zone (10), an air pump (7) is used for increasing oxygen while guiding the sewage, and a simultaneous nitrification and denitrification method is used to remove total nitrogen (TN) and decompose organics under the action of microorganisms. Thirdly, a chemical reaction method is adopted to remove P and N in the sewage, after the former two steps of treatment, mass P and N with a certain amount still exist in the sewage, liquid magnesium oxide is again added for generating magnesium ammonium phosphate precipitates, and the supernatant is discharged when reaching the standards. The method has advantages of speediness, land saving, energy saving, complete material transfer, small influence under external conditions and good purification effects when treating wastewater.

The invention relates to a rapid start method for an integrated autotrophic denitrification system and belongs to the technical field of treatment of sewage with high ammonia nitrogen. An SBR (Sequencing Batch Reactor) is inoculated with short-cut nitrification sludge and anammox sludge according to the mass ratio of (1: 3) to (1: 1), and the concentration of mixed sludge is 3,000mg / L to 4,000mg / L. The dissolved oxygen is controlled to be 0.3mg / L to 0.5mg / L by adopting an intermittent aeration operating mode, and the accumulation amount of nitrite nitrogen at the end of aeration is 20mg / L to 30mg / L; in each cycle, three aeration and hypoxic stages are set at intervals; each cycle has six stages, i.e., water inlet, aeration / hypoxic reaction, stirred degassing, precipitating, water outlet and standing. In a starting process, the concentration of dissolved oxygen is controlled unchanged, the balance of supply and consumption of nitrite nitrogen is maintained through a method of stagewise prolonging aeration stage time and shortening hypoxic stage time, and the rapid increase of denitrification load is achieved. When the initial ammonia nitrogen concentration in the reactor reaches 300mg / L, the balance of supply and consumption of nitrite nitrogen is maintained by means of shortening the hypoxic stage time. According to the method, the starting speed is high, the total-nitrogen removal load is high, and the operation is stable.

The invention discloses a pseudomonas sp. strain capable of carrying out biological denitrification under a low temperature and an application thereof. The pseudomonas sp. strain HA11 provided by the invention was collected in the China General Microbiological Culture Collection Center (CGMCC) on September 15, 2010, with the collection number of CGMCC No.4169. At the temperature of 10-20 DEG C, the strain can carry out biological denitrification as long as the strain is put into the nitrogenous wastewater with dissolved oxygen of 2-6mg / L. The strain has the following beneficial effects: the strain has strong tolerance to low temperature, can grow well under a low temperature and simultaneously has the capabilities of heterotrophic nitrification and aerobic denitrification; and the strain can carry out nitrification and denitrification synchronously under low temperature and aerobic conditions to efficiently and thoroughly remove the total nitrogen in the sewage, thus effectively solving the great difficulty in carrying out biological denitrification under a low temperature and having a good application prospect.

The invention relates to antagonistic bacteria preventing and removing continuous cropping tomato bacterial wilt and a microbial organic fertilizer produced thereby, which belong to the technologies of agricultural intensified production. The antagonistic bacteria NJQL-18 with the significant antagonistic effect for pathogenic bacteria of the tomato bacterial wilt is obtained by separation, solidfermentation is further carried out on the antagonistic bacteria and organic materials for preparing the microbial organic fertilizer, the fertilizer contains more than 1 multiplied by 10<8> / g of NJQL-18, the content of total nitrogen is 4-5% (more than 90% is organic nitrogen), the total content of nutrients of nitrogen, phosphorus and potassium is 6-10%, and the content of organic matters is 30-35%. Tests show that the microbial organic fertilizer can lead the antagonistic bacteria to be rapidly propagated after being applied into the soil and form heterotic groups in the soil, and the biological prevention efficiency in the soil with the serious tomato bacterial wilt can be more than 80%. The long-term application of the microbial organic fertilizer in the soil without the formation ofcontinuous cropping obstacles can prevent the occurrence of the continuous cropping tomato bacterial wilt to a great extent.

The invention discloses an operating method for a high-efficient anaerobic ammonium oxidation reactor. The method comprises the steps of (1) inoculating anaerobic granular sludge in an anaerobic reactor, the wherein the anaerobic granular sludge accounts for 30-90% of total volume of the reactor; and (2) taking nitrogenous simulating wastewater as reaction inflowing water, wherein the temperatureof the reactor is controlled to be in 18-37 DEG C; and in a reactor starting stage, remaining hydraulic power for 12-48h, adjusting reaction operating conditions according to concentration of ammonianitrogen and / or nitrite nitrogen, operating the anaerobic reactor for 30-150d, and forming high-efficient anaerobic ammonium oxidation granular sludge enriched with anaerobic ammonium oxidation bacteria. The method improves total nitrogen load of the reactor in a way that the load is increased gradually by lower load so as to be beneficial to stable increasing of domestication enrichment and nitrogen removing rate of the anaerobic ammonium oxidation bacteria, can effectively avoid matrix restraining of anaerobic ammonium oxidation and is beneficial to reducing process operating cost when the reactor operates under a room temperature condition.

The invention discloses an aerobic-anoxic-anaerobic integrated module type fast denitrogenation reactor for sewage and a treatment method thereof and relates to an integrated sewage treatment device, which is particularly suitable for fast integrated treatment for sewage by denitrogenation technology. The device is designed for solving the problems of complex process, high treatment expense, additional carbon source and regulation of outflow pH, difficult zero discharge and the like existing in aerobic-anoxic-anaerobic denitrogenation sewage treatment. Aerobic-anoxic-anaerobic processes are technically integrated to enable sewage to be always in an alternate aerobic-anoxic-anaerobic environment; an organic carbon source, organic nitrogen and total phosphorus are distributed reasonably to avoid shortage of carbon source during denitrogenation, so that total nitrogen and total phosphorus are converted effectively, the effect of denitrogenation and dephosphorization are improved, and discharged water reaches first discharge standard of Integrated Wstewater Discharge Standard (GB8978-1996). The device is used for treating municipal domestic sewage, especially sewage of middle and small stations along railway lines.

The invention discloses a preparation method of an immobilized microorganism embedding microsphere for restoring a riverbed bottom mud ecosystem. The preparation method comprises the steps of PVA (polyvinyl alcohol) gel preparation, cross-linking agent preparation and microsphere preparation, wherein the PVA gel preparation comprises the steps of preparing a PVA solution with a concentration of 8-10%, adding embedding agents to the PVA solution, namely sodium alginate with a concentration of 0.5-2%, calcium carbonate with a concentration of 0.2-0.5%, silicon dioxide with a concentration of 2.0-4.0%, and 300-500 mesh attapulgite powder or 300-500 mesh activated carbon powder with a concentration of 0.5-1.0%, and adding activated limon microorganism bacterium liquid with a concentration of 10-15%; and the microsphere preparation comprises the steps of dropwise adding PVA gel to a calcium chloride saturated boric acid solution, stirring, obtaining immobilized microorganism activated spherular particles with the particle size of 3-5mm, conducting immobilized crosslinking for 24-36h at 4-8 DEG C, taking out, and washing with normal saline. Compared with the prior art, the microsphere can remove total organic carbon and total nitrogen in riverbed bottom mud effectively, and can improve COD (chemical oxygen demand), ammonia nitrogen and total nitrogen pollution conditions of an overlying water body of the bottom mud, and the preparation method is an ecological riverway management scheme which is efficient, low-consumption and simple to operate, and has a development prospect.