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CN-121990682-A - Sulfur autotrophic filler, preparation method and application thereof, and high-salt wastewater denitrification and dephosphorization device

CN121990682ACN 121990682 ACN121990682 ACN 121990682ACN-121990682-A

Abstract

The invention provides a sulfur autotrophic filler, a preparation method and application thereof, and a high-salt wastewater denitrification and dephosphorization device. The sulfur autotrophic filler comprises cross-linked gel, sulfur autotrophic denitrifying bacteria, sulfur powder, siderite powder, trehalose and/or betaine and an auxiliary material dispersed in the cross-linked gel, wherein the auxiliary material comprises at least one of volcanic powder, medical stone powder and limestone powder. The sulfur autotrophic filler provided by the invention can accelerate the rapid enrichment and functional expression of sulfur autotrophic denitrifying bacteria in the application of high-salt wastewater treatment, and realize the deep denitrification and synchronous dephosphorization of nitrate nitrogen wastewater in a salt stress environment.

Inventors

  • LI XIANGCHEN
  • CAO ZONGLUN
  • SUN JIE
  • LI HAILONG
  • Gong xiaozhi
  • WANG JUN
  • XU ZHICHENG
  • Liu Diequn

Assignees

  • 中国石油化工股份有限公司
  • 中石化(北京)化工研究院有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. The sulfur autotrophic filler is characterized by comprising crosslinked gel, sulfur autotrophic denitrifying bacteria, sulfur powder, siderite powder, trehalose and/or betaine and an auxiliary material, wherein the sulfur autotrophic denitrifying bacteria, the sulfur powder, the siderite powder, the trehalose and/or betaine and the auxiliary material are dispersed in the crosslinked gel, and the auxiliary material comprises at least one of volcanic powder, medical stone powder and limestone powder.
  2. 2. The sulfur autotrophic filler according to claim 1, wherein the mass ratio of the sum of the mass of the sulfur autotrophic denitrifying bacteria agent, sulfur powder, siderite powder, trehalose and/or betaine, and adjuvant materials to the crosslinked gel based on the gel component is (1-50): 1, preferably (5-25): 1; The mass ratio of the sulfur autotrophic denitrifying bacteria agent to the sulfur powder to the siderite powder to the trehalose and/or the betaine to the auxiliary agent material is (10-30): 10-10): 1; the content of the sulfur autotrophic denitrifying bacteria in the sulfur autotrophic denitrifying bacteria agent is 1 multiplied by 10 6 ～1×10 9 CFU/mL.
  3. 3. The sulfur autotrophic filler of claim 1 or 2, wherein the crosslinked gel comprises at least one of crosslinked polyethylene glycol, polyvinyl alcohol, sodium alginate, and polyacrylic acid.
  4. 4. A method for preparing a sulfur autotrophic filler according to any one of claims 1-3, comprising the steps of obtaining a gel suspension comprising a gel component and water, adding a sulfur autotrophic denitrifying bacteria agent, sulfur powder, siderite powder, trehalose and/or betaine and an auxiliary agent material into the gel suspension, stirring to obtain a gel mixed solution, dripping the gel mixed solution into a cross-linking agent, washing and drying the obtained solid, and obtaining the sulfur autotrophic filler; The auxiliary agent material comprises at least one of volcanic rock powder, medical stone powder and limestone powder.
  5. 5. The preparation method according to claim 4, wherein the mass ratio of the sum of the mass of the sulfur autotrophic denitrifying bacteria agent, sulfur powder, siderite powder, trehalose and/or betaine and the auxiliary agent material to the gel component is (1-50): 1, preferably (5-25): 1; The mass ratio of the sulfur autotrophic denitrifying bacteria agent to the sulfur powder to the siderite powder to the trehalose and/or the betaine to the auxiliary agent material is (10-30): 10-10): 1; the content of the sulfur autotrophic denitrifying bacteria in the sulfur autotrophic denitrifying bacteria agent is 1 multiplied by 10 6 ～1×10 9 CFU/mL.
  6. 6. The method according to claim 4 or 5, wherein the gel component comprises at least one of polyethylene glycol, polyvinyl alcohol, sodium alginate, and polyacrylic acid; And/or the cross-linking agent comprises a first cross-linking agent and a second cross-linking agent, wherein the first cross-linking agent comprises at least one of calcium chloride, magnesium chloride and zinc chloride, the second cross-linking agent comprises boric acid and/or sodium tetraborate, and preferably, the mass ratio of the first cross-linking agent to the second cross-linking agent is (0.5-5).
  7. 7. The preparation method according to any one of claims 4 to 6, wherein the mass concentration of the gel component in the gel suspension is 0.5% to 10%; And/or the gel suspension is prepared under the conditions of heating and stirring, preferably, the heating temperature is 50-100 ℃, the stirring speed is 200-500 rpm, and the stirring time is 10-60 min.
  8. 8. The production method according to any one of claims 4 to 7, wherein the particle size of the sulfur powder is 50 to 200 mesh; and/or the grain size of the siderite powder is 50-200 meshes; and/or the particle size of the auxiliary agent material is 50-200 meshes.
  9. 9. Use of the sulfur autotrophic filler of any one of claims 1-3 or the sulfur autotrophic filler prepared by the preparation method of any one of claims 4-8 in sewage treatment, in particular for denitrification and dephosphorization of high-salt wastewater.
  10. 10. The device for denitrification and dephosphorization of the high-salinity wastewater is characterized by comprising a water distribution layer, a supporting layer, a packing layer, a transition layer and a clear water separation layer which are sequentially distributed from bottom to top; the water distribution layer is used for introducing wastewater pumped from the lower end of the device into the supporting layer; Solid particles with the particle size of 10-50 mm are filled in the supporting layer and are used for preventing the device from being blocked and facilitating uniform water distribution; The filler layer is filled with the sulfur autotrophic filler as defined in any one of claims 1-3 or prepared by the preparation method as defined in any one of claims 4-8, and is used for denitrification and dephosphorization treatment of wastewater; the transition layer is used for statically settling suspended matters in the wastewater; The clear water separating layer is used for carrying out solid, liquid and gas three-phase separation on the treated wastewater; Preferably, the method comprises the steps of, The height-diameter ratio of the device is 2-5, wherein the water distribution layer accounts for 1/15-1/10 of the effective height of the device, the supporting layer accounts for 1/10-1/8 of the effective height of the device, and the packing layer accounts for 1/2-2/3 of the effective height of the device.

Description

Sulfur autotrophic filler, preparation method and application thereof, and high-salt wastewater denitrification and dephosphorization device Technical Field The invention belongs to the technical field of sewage treatment, and particularly relates to a sulfur autotrophic filler, a preparation method and application thereof, and a high-salt wastewater denitrification and dephosphorization device. Background The chemical wastewater has the characteristics of high salt, high ammonia nitrogen and low BOD, and after the conventional carbon removal and denitrification biochemical treatment, nitrate nitrogen with a certain concentration usually remains in the tail water. Along with the proposal of the related national regulations of the export of the platform, the total nitrogen emission standard of the treated water is further strict, and a denitrification treatment unit is required to be arranged subsequently for further removal after the conventional biochemical treatment. In order to ensure the deep removal of nitrate nitrogen, an excessive amount of organic carbon source is required to be added into the denitrification unit, so that the risk of exceeding the standard of COD of effluent exists, and an aeration tank is required to be arranged subsequently, so that the problems of the increase of the treatment flow, the increase of the occupied area of the sewage treatment unit and the like are caused. In addition, the traditional denitrification process has the problems of high output of excess sludge, high emission of greenhouse gases and the like, and further optimization is needed. Based on the production characteristics of the chemical industry, the total salt content in chemical wastewater is often higher than 1%, and at present, partial chemical wastewater treatment plants use ultrafiltration, reverse osmosis and other membrane technologies to carry out advanced treatment on wastewater, so that high-quality effluent quality is realized, and the produced concentrated water contains nitrate nitrogen and salinity with higher concentration. The microbial denitrification effect is greatly reduced under the condition of salt stress, mainly because the higher osmotic pressure in the water environment can trigger the separation of cell protoplasm, and the salting-out effect can reduce the activity of dehydrogenase, thereby inhibiting the metabolic activity of functional microorganisms. The sulfur autotrophic denitrification refers to a process that the sulfur autotrophic denitrification bacteria takes reducing sulfur such as elemental sulfur and the like as an electron donor to reduce nitrate nitrogen into nitrogen gas to be removed from a water body. The process does not need to add an organic carbon source, has low output of excess sludge, does not need to be connected with aeration treatment, has small occupied area of structures, and gradually becomes a research and application hot spot in the field of sewage treatment. However, partial sulfate radical is generated in the sulfur autotrophic denitrification process, so that the salinity of the wastewater is further improved, and the microbial treatment performance is threatened. Therefore, it is urgent to develop a sulfur autotrophic process capable of realizing high-efficiency and low-consumption removal of nitrate nitrogen under salt stress conditions. CN114291900a discloses a sulfur autotrophic denitrification particle, a preparation method and application thereof, which uses biological sulfuration, sodium thiosulfate, active carbon, embedding medium and sulfur autotrophic denitrification bacterial liquid to prepare sulfur autotrophic filler, and inoculates the sulfur autotrophic filler into a sulfur autotrophic fluidized bed reactor to realize the denitrification of wastewater with the concentration of NO 3- -N of 30 mg/L. However, the sulfur autotrophic process consumes inorganic carbon source, so that an appropriate amount of inorganic carbon source is additionally added in the process of treating wastewater by using the filler, and the denitrification performance of the filler in a salt stress environment is easy to be inhibited. CN114524511B discloses an alkalinity slow-release porous spherical shell suspended filler based on low C/N sewage sulfur autotrophic denitrification, and developed a sulfur autotrophic denitrification filler from inorganic carbon source, which can maintain neutral pH in the low C/N sewage treatment process, and is beneficial to smooth proceeding of the sulfur autotrophic process. However, the filler is also limited to treating low-salt wastewater, and the efficiency of the filler is not easy to develop in the treatment of high-salt wastewater. Disclosure of Invention In view of the analysis, the invention aims to provide a sulfur autotrophic filler, a preparation method and application thereof, and a high-salt wastewater denitrification and dephosphorization device, which are used for solving the technical problems of high cont