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CN-119750793-B - Treatment process and system for high-oil-pollution and high-phosphorus wastewater

CN119750793BCN 119750793 BCN119750793 BCN 119750793BCN-119750793-B

Abstract

The invention discloses a treatment process of high-oil-stain and high-phosphorus wastewater, which specifically comprises the steps of treating the wastewater by utilizing microbial balls, carrying out photocatalysis treatment on the wastewater by utilizing a photocatalysis film, and regulating the dissolved oxygen content of the wastewater to be 3-4 mg/L, wherein the microbial balls contain bacillus tropicalis and chlorella vulgaris. The invention also discloses a system for treating the high-greasy dirt and high-phosphorus wastewater by applying the treatment process. The treatment process and the treatment system for the high-oil-pollution and high-phosphorus wastewater can effectively degrade total phosphorus and organic pollutants in the wastewater, particularly oil pollutants, and effectively prevent the pollution and blockage of the oil pollution to the composite photocatalytic film.

Inventors

  • JIANG BICUN
  • LIU TIANHAO
  • WANG QIANG
  • Tao Hujin

Assignees

  • 南京环保产业创新中心有限公司

Dates

Publication Date
20260512
Application Date
20241231

Claims (10)

  1. 1. The treatment process of the high-oil-pollution and high-phosphorus wastewater is characterized by comprising the following steps of: treating the wastewater by utilizing the microbial balls; Performing photocatalysis treatment on the wastewater by using a photocatalysis membrane; The treatment of the wastewater by the microbial balls and the photocatalysis treatment of the wastewater by the photocatalysis membrane are carried out in the same reactor; The position of the photocatalytic film is arranged above 1/2 of the height of the reactor; regulating the dissolved oxygen content of the wastewater by utilizing micro-nano bubbles with the particle size of 40-80 mu m to ensure that the dissolved oxygen content is 3-4 mg/L; wherein the diameter of the microbial sphere is 4-6 mm, and the microbial sphere contains bacillus tropicalis and chlorella vulgaris; The microbial balls with the particle size of 4-6 mm are mainly distributed in the area below 1/2 of the height of the reactor in the reactor with continuous aeration and water inflow.
  2. 2. The process for treating high-oil-pollution and high-phosphorus wastewater according to claim 1, which is characterized in that, And calculating the volume ratio of the microbial balls to the total volume by taking the sum of the volumes of the microbial balls and the wastewater as the total volume, wherein the volume ratio of the microbial balls is 25-35%.
  3. 3. The process for treating high-oil-stain and high-phosphorus wastewater according to claim 2, wherein when the wastewater is treated by the microbial balls, the treatment conditions include: the hydraulic retention time is 16-24 h; the pH of the water body is 7.0-7.5; The temperature is 25-30 ℃; the intensity of the visible light source is 5000-70000 lx/m 3 ; the light source is alternately controlled to be on or off, and the light-dark time ratio is controlled to be (12 h-14 h): 12h.
  4. 4. The process for treating high-oil-stain and high-phosphorus wastewater according to claim 3, wherein when the wastewater is subjected to photocatalytic treatment by using a photocatalytic film, the treatment conditions include: the hydraulic retention time is 16-24 h; the pH of the water body is 7.0-7.5; the temperature is 25-30 ℃.
  5. 5. The process for treating high-oil-pollution and high-phosphorus wastewater according to any one of claims 1-4, which is characterized in that, The treatment conditions in the photocatalytic treatment further include: the intensity of the visible light source is 5000-70000 lx/m 3 ; the light source is alternately controlled to be on or off, and the light-dark time ratio is controlled to be (12 h-14 h): 12h.
  6. 6. The process for treating high-oil-pollution and high-phosphorus wastewater according to claim 5, wherein the microbial spheres are obtained by the following steps: Culturing the tropical bacillus to a logarithmic growth phase, and centrifuging to obtain wet bacterial mud, namely bacterial mud A; Culturing the chlorella vulgaris to the logarithmic phase, centrifuging to obtain wet bacterial mud, and recording the wet bacterial mud as bacterial mud B; Uniformly mixing the bacterial mud A and the bacterial mud B, and marking as mixed bacterial mud C; Immobilizing and embedding the mixed bacterial sludge C to obtain microbial balls; In the cultivation process of the chlorella vulgaris, the light intensity is 5000-70000 lx, the light source is alternately controlled to be turned on and off, the light-dark time ratio is (12 h-14 h): 12h, the temperature is 25-28 ℃, and centrifugation is performed at 6000-10000 rpm, so that the chlorella vulgaris in the bacterial mud B is obtained, and the content of the chlorella vulgaris in the bacterial mud B is 1X 10 9 ~5×10 9 CFU/mL.
  7. 7. The process for treating high-oil-pollution and high-phosphorus wastewater according to claim 6, wherein the preparation process of the bacterial sludge A comprises the steps of inoculating the bacillus tropicalis into an LB liquid culture medium, culturing at 30-35 ℃ to logarithmic phase, and centrifuging at 6000-10000 rpm to obtain the bacterial sludge A, wherein the content of the bacillus tropicalis in the bacterial sludge A is 2X 10 10 ~8×10 10 CFU/mL; And/or the number of the groups of groups, The preparation process of the mixed bacterial sludge C comprises the steps of fully and uniformly mixing the bacterial sludge A and the bacterial sludge B according to the mass ratio of 1 (4-5) at the temperature of 2-6 ℃ to form the mixed bacterial sludge C; And/or the number of the groups of groups, The immobilized embedding method of the mixed bacterial mud C comprises the following steps: Inoculating the mixed bacterial mud C to a sodium alginate solution with the concentration of 2-5wt% and the inoculum size of 20-30%, and uniformly mixing to obtain a mixed solution; the mixed solution is added into 3-10wt% of calcium chloride solution in a dropwise manner, and the mixture is kept stand until the mixture is solidified into balls; refrigerating the calcium chloride solution containing the pellets at the temperature of 4 ℃, and standing for 10-15 h; And washing residual liquid on the surface of the pellet by using sterile normal saline, and draining to obtain the microbial pellet.
  8. 8. The process for treating high-oil-pollution and high-phosphorus wastewater according to claim 1, which is characterized in that, The dosage of the photocatalytic film is 25-30 cm 2 /L; the load of the photocatalyst in the photocatalytic film is 5-8 mg/cm 2 .
  9. 9. The process for treating high-oil-stain and high-phosphorus wastewater according to any one of claims 1-4 and 6-8, wherein COD (chemical oxygen demand) before wastewater treatment is 1500-1500 mg/L, petroleum is 50-80 mg/L, and total phosphorus is 25-50 mg/L.
  10. 10. A high-greasy dirt and high-phosphorus wastewater treatment system is characterized by sequentially comprising a water inlet system, a membrane treatment reactor system and a water outlet system; The membrane treatment reactor system comprises a membrane treatment reactor, a visible light source, a photocatalytic membrane, a micro-nano bubble generator and a microbial sphere; The water inlet system is arranged at the lower part of the membrane treatment reactor; the height-diameter ratio of the membrane treatment reactor is (3-4): 1; The visible light source is arranged in the film treatment reactor, and the light and dark time ratio in the reactor can be controlled by controlling the on and off of the visible light source; The micro-nano bubble generator is used for introducing micro-nano bubbles with the particle size of 40-80 mu m from the bottom of the membrane treatment reactor, so that the content of dissolved oxygen in the membrane treatment reactor is controlled; The position of the photocatalytic film is arranged above 1/2 of the height of the film treatment reactor; the diameter of the microbial sphere is 4-6 mm; The microbial spheres with the particle size of 4-6 mm are mainly distributed in the area below 1/2 of the height of the membrane treatment reactor in the membrane treatment reactor with continuous aeration and water inflow; The photocatalysis membrane is connected with a water outlet pump, and the water outlet pump is connected with the water outlet system.

Description

Treatment process and system for high-oil-pollution and high-phosphorus wastewater Technical Field The invention belongs to the field of industrial wastewater treatment, and particularly relates to a treatment process and a treatment system for high-oil-pollution and high-phosphorus wastewater. Background The photocatalysis technology is a novel advanced oxidation technology, which is characterized in that a semiconductor material is used as a catalyst to directly convert light energy into chemical energy, the photocatalyst can generate strong oxidative free radicals under the condition of ultraviolet or visible light irradiation, and can decompose most organic substances and part of inorganic substances harmful to human bodies and the environment, and finally generate inorganic micromolecules such as H 2O、CO2 and the like, so that the waste of resources and the formation of secondary pollution can be avoided, and the photocatalysis technology is widely valued at home and abroad. Among various semiconductor photocatalysts, the TiO 2 photocatalyst is widely applied to the field of water treatment due to the advantages of low cost, innocuity, strong photochemical stability, no secondary pollution and the like. Patent CN105854899B discloses a Bi 2S3/TiO2 composite visible light catalyst and a preparation method thereof, and the visible light catalytic activity is realized by compositing TiO 2 with a narrow band gap semiconductor Bi 2S3. Bi 2S3 is a semiconductor with a layered structure, the band gap energy of the semiconductor is only 1.3ev, the semiconductor can be excited by visible light, and photo-generated electrons can be directly injected into a TiO 2 conduction band, so that the semiconductor has potential visible light catalytic activity. The automobile coating wastewater is mainly wastewater produced in the production operation of an automobile coating workshop, a large amount of oil stains and total phosphorus exist in the automobile coating wastewater, when the wastewater is treated by using the membrane loaded with the composite photocatalyst, the oil stains are easy to adhere to the surface of the membrane, so that the membrane holes are blocked, the membrane is polluted, the water flux of the membrane is reduced, the operating pressure is increased, the service life of the membrane is prolonged, the energy consumption is increased, the treatment efficiency is reduced, and the like. And the composite photocatalytic film is cleaned regularly, which is not beneficial to the continuous operation of wastewater treatment. Meanwhile, the automobile coating wastewater also contains a large amount of total phosphorus, so that an independent degradation treatment procedure is required to be set in the wastewater treatment process, the wastewater treatment efficiency is reduced, and the wastewater treatment cost is increased. Disclosure of Invention 1. Problems to be solved Aiming at the problem that the composite photocatalytic film is easy to be blocked by oil pollution in the existing automobile coating wastewater treatment process, the invention provides a treatment process for high-oil-pollution and high-phosphorus wastewater. The process aims to realize the efficient degradation of the greasy dirt in the wastewater by organically combining the microbial sphere, the micro-nano bubble generator, the visible light source and the composite photocatalytic film, greatly delay the pollution process of the composite photocatalytic film, effectively improve the flux of the composite photocatalytic film and reduce the cleaning frequency of chemical agents on the composite photocatalytic film. Meanwhile, the process can degrade total phosphorus, simplify the existing automobile coating wastewater treatment process and omit a separate total phosphorus degradation process. In addition to the above object, the present invention also provides a system for treating high-oil-pollution and high-phosphorus wastewater, which is used for treating high-oil-pollution and high-phosphorus wastewater, such as automobile coating wastewater. 2. Technical proposal In order to solve the problems, the technical scheme adopted by the invention is as follows: The invention provides a treatment process of high-oil-pollution and high-phosphorus wastewater, which comprises the following steps: treating the wastewater by utilizing the microbial balls; Performing photocatalysis treatment on the wastewater by using a photocatalysis membrane; adjusting the dissolved oxygen content of the wastewater to be 3-4 mg/L; Wherein the microbial balls contain bacillus tropicalis and chlorella vulgaris. In the invention, the tropical bacillus can effectively degrade organic pollutants in an aerobic environment, has obvious degradation effect on oil pollutants, based on the method, the invention provides a symbiotic system of bacillus tropicalis and common chlorella, and a microbial sphere for high-oil-pollution and high-phosphorus wastewater is desi