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CN-121974537-A - Substrate sludge environment in-situ repair particle and preparation method thereof

CN121974537ACN 121974537 ACN121974537 ACN 121974537ACN-121974537-A

Abstract

The invention relates to the technical field of environmental sludge treatment, in particular to a substrate sludge environment in-situ repair particle and a preparation method thereof. The composite material comprises zeolite powder, volcanic rock powder, bentonite, silica sol, a precursor for loading functional components and bacillus spore powder. The invention discloses a substrate sludge in-situ repair particle which is of a core-shell structure, wherein a porous framework is constructed by an activated zeolite-volcanic rock in a core, and Fe/Mn and Mg/Ca loading sites are combined to realize pollutant adsorption, fixation and passivation, so that the substrate sludge microenvironment is improved to create conditions for the bioremediation of bacillus at the outer layer, so that the space-time synergy of physical and biological repair is formed, and the preparation route of solidifying and nucleating at first and then coating at low temperature is adopted to solve the contradiction between mineral roasting and microorganism intolerance, ensure the activity of spores and improve the anti-loss capability of the spores.

Inventors

  • Gong Jitong

Assignees

  • 北京水森林环境工程有限公司

Dates

Publication Date
20260505
Application Date
20260401

Claims (10)

  1. 1. The in-situ repair particle for the substrate sludge environment is characterized by comprising the following raw materials of zeolite powder, volcanic rock powder, bentonite, silica sol, a functional component-loaded precursor and bacillus spore powder; the functional component precursor comprises an iron source, a manganese source, a magnesium source and a calcium source; The particle size of the zeolite powder and the volcanic rock powder is 100-200 meshes.
  2. 2. The substrate sludge environment in-situ remediation particles of claim 1 wherein the iron source is selected from the group consisting of FeCl 3 and Fe (any one of NO 3 ) 3 ), the manganese source is selected from the group consisting of MnSO 4 and Mn (any one of NO 3 ) 2 ), the magnesium source is selected from the group consisting of MgCl 2 、MgSO 4 and Mg (any one of NO 3 ) 2 ), and the calcium source is selected from the group consisting of CaCl 2 、Ca(NO 3 ) 2 Ca(OH) 2 and light CaCO 3 .
  3. 3. The substrate sludge environment in-situ remediation granule of claim 1 wherein the bacillus spore powder has an effective viable count of 1 x 10 9 ～10 10 CFU/g.
  4. 4. A method for preparing the substrate sludge environment in-situ remediation particles of any one of claims 1 to 3, comprising the steps of: s1, weighing zeolite powder, volcanic rock powder and bentonite according to a proportion, and putting the zeolite powder, the volcanic rock powder and the bentonite into a mixer for dry mixing to obtain uniform mineral mixed powder; S2, adding the mixed powder of S1 into an HCl solution, stirring at room temperature, filtering, washing with deionized water, and drying to obtain acid activated mineral powder; S3, placing the S2 acid activated mineral powder into a muffle furnace for roasting, and naturally cooling to room temperature to obtain mineral carrier powder; S4, preparing a mixed solution of an iron source and a manganese source by deionized water to obtain a metal salt solution I, adding S3 mineral carrier powder into the metal salt solution I, heating and stirring, dropwise adding NaOH to adjust pH, continuously stirring, standing for ageing, filtering, washing by deionized water, and drying to obtain Fe/Mn load powder; S5, preparing a mixed solution of a magnesium source and a calcium source by deionized water to obtain a metal salt solution II, adding the S4 Fe/Mn load powder into the metal salt solution II, heating and stirring, regulating the pH by using 1mol/L Na 2 CO 3 solution, continuously stirring, standing and aging, filtering, washing with deionized water until the pH of the filtrate is neutral, and drying to obtain Fe/Mn/Mg/Ca co-load powder; s6, roasting the S5 Fe/Mn/Mg/Ca co-supported powder in an air atmosphere, and naturally cooling to room temperature to obtain solidified powder; S7, putting the cured powder in a granulating mixer, spraying silica sol and deionized water while mixing, mixing to ensure that the wet material is uniform and in a pelletizable state, continuously putting into a disc for granulating, controlling the particle size of a finished product, curing and drying to obtain mineral functional core particles; S8, preparing sodium alginate solution by deionized water, stirring and dissolving, adding trehalose, cooling the solution to room temperature, adding bacillus spore powder, and gently stirring uniformly to obtain spore coating liquid; And S9, placing the mineral functional core particles in the step S7 in a fluidized bed, spraying the spore coating liquid in the step S8, soaking the wet particles in CaCl 2 solution, crosslinking the outer layer of sodium alginate into a film, taking out, draining, and drying in vacuum to obtain the in-situ repair particles.
  5. 5. The method for preparing in-situ repair particles for a substrate sludge environment according to claim 4, wherein in the step S1, the mass usage ratio of the zeolite powder, the volcanic rock powder and the bentonite is 10:6-7:0.6-0.8.
  6. 6. The method for preparing in-situ repair particles for a sludge environment according to claim 4, wherein in the step S2, the solid-to-liquid ratio of the mixed powder and the HCl solution is 1 g:6-10 ml.
  7. 7. The method for preparing in-situ repair particles for a sludge environment according to claim 4, wherein in the step S3, the roasting temperature is 500-580 ℃ for 1-3 hours.
  8. 8. The method for preparing the substrate sludge environment in-situ remediation particles according to claim 4, wherein in the step S4, the solid-liquid dosage ratio of the mineral carrier powder to the metal salt solution I is 1 g:8-10 mL, and in the step S5, the solid-liquid dosage ratio of the Fe/Mn supported powder to the metal salt solution II is 1 g:8-12 mL.
  9. 9. The method for preparing the substrate sludge environment in-situ repair particles according to claim 4, wherein in the step S7, siO 2 in the silica sol is contained in an amount of 30wt%, the addition amount of the silica sol is 1-3 wt% of the mass of S6 cured powder calculated by SiO 2 , and the angle of the granulating disc is 40-60 degrees, and the rotating speed is 15-20 rpm.
  10. 10. The method for preparing the substrate sludge environment in-situ remediation particles according to claim 4, wherein in step S8, the activity of bacillus in the bacillus cladding liquid is 1X 10 7 ～10 8 CFU/mL, the spraying parameters are that the air inlet temperature of a fluidized bed is 25-35 ℃, the atomization air pressure is 0.1-0.25 MPa, the spraying flow of the cladding liquid is 15-30 mL/min, and the target cladding weight gain is 8-12 wt%.

Description

Substrate sludge environment in-situ repair particle and preparation method thereof Technical Field The invention relates to the technical field of environmental sludge treatment, in particular to a substrate sludge environment in-situ repair particle and a preparation method thereof. Background The sediment is used as an important sink and potential release source of water pollutants, and is rich in components such as nitrogen, phosphorus, organic matters, heavy metals and the like for a long time. Under the anoxic or anaerobic condition, the substrate sludge is easy to generate reduction enhancement and sulfide generation, and the problems of repeated eutrophication, black odor, water quality fluctuation and the like of the water body are caused by the formation of endogenous pollution continuous reflux due to the transformation of ammonia nitrogen, phosphate and partial metal forms and the upward water covering release. Therefore, the development of the substrate sludge in-situ restoration material which is efficient, stable and engineering-executable is an important requirement for river and lake management and black and odorous water body remediation. The existing sediment in-situ repair technology mainly comprises dredging, covering and isolating, adding adsorption/fixing materials, in-situ redox regulation, bioremediation and the like. The dredging has the advantages of rapid pollution load reduction, large engineering quantity, high cost, easy generation of secondary disturbance and sediment disposal pressure, coverage and isolation, reduction of sediment and water body exchange, high requirements on material anti-scouring and long-term stability, and difficulty in synchronously solving the internal pollution conversion and continuous release of the sediment. The addition of minerals or modified materials is widely used because of relatively simple construction, such as zeolite, bentonite, volcanic rock powder, biochar, and modified minerals of iron, calcium, magnesium, etc., which can be used for adsorbing ammonium nitrogen, fixing phosphate or holding heavy metals. However, the materials depend on a single mechanism, and often have the problems of insufficient cooperative control of various pollutants, attenuation of the effect with time, turbidity and loss caused by easy dispersion or pulverization of powder, poor fixation stability under a strong reduction environment, and the like, so that the long-term restoration effect is influenced. The bioremediation can strengthen the conversion of organic matters and improve black and odorous substances by adding functional microorganisms or promoting the recovery of an in-situ microbial community, but is often limited by factors such as sulfide toxicity, reducibility fluctuation, salinity change, primary microorganism competition and the like in the actual substrate sludge environment, and exogenous bacteria are easy to have the conditions of slow recovery, unstable effect, diluted or eroded loss and the like. In order to improve engineering application stability, carrier immobilization or slow release protection is usually required, but the existing carrier system is mostly separated from inorganic immobilization materials, and is difficult to form integrated multi-target continuous repair. In addition, although the prior art proposes that the mineral material and the microorganism are compounded to give consideration to fixation and bioremediation, the preparation of the metal modified mineral often involves the steps of acid/alkali treatment, roasting, solidification and the like, the microorganism is sensitive to high temperature and salt, the microorganism is compatible in the same material and keeps long-term activity, obvious contradiction exists, and meanwhile, the absorption and the burying of the mineral powder to thalli or extracellular enzymes possibly weaken the biological action, so that a compounded system tends to be simply overlapped, and stable synergy is difficult to obtain. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a substrate sludge environment in-situ repair particle and a preparation method thereof. The technical effect of the invention is realized by the following technical scheme that the in-situ repair particle for the substrate sludge environment comprises the following raw materials of zeolite powder, volcanic powder, bentonite, silica sol, a precursor for loading functional components and bacillus spore powder; further, the particle size of the zeolite powder and the volcanic rock powder is 100-200 meshes; Further, the functional component precursor comprises an iron source, a manganese source, a magnesium source and a calcium source; Further, the iron source is selected from any one of FeCl 3 and Fe (NO 3)3; Further, the manganese source is selected from any one of MnSO 4 and Mn (NO 3)2; Further, the magnesium source is selected from any one of MgCl 2、MgSO4 and Mg (NO 3)2;