Method for biological enhancement treatment of refractory organic pollutants with photo-excited hole as electron acceptor

A technology of organic pollutants and electron acceptors, applied in sustainable biological treatment, biological water/sewage treatment, water pollutants, etc., can solve the problems of low biodegradation technology load, difficult catalyst recovery, high cost, and achieve efficient removal ability, improve catalytic efficiency, and avoid the effect of recombination

Active Publication Date: 2020-10-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low efficiency, high cost, difficulty in catalyst recovery, and low load of biodegradation technology in traditional semiconductor photocatalysis technology when dealing with refractory organic pollutants, the present

Method used

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  • Method for biological enhancement treatment of refractory organic pollutants with photo-excited hole as electron acceptor
  • Method for biological enhancement treatment of refractory organic pollutants with photo-excited hole as electron acceptor
  • Method for biological enhancement treatment of refractory organic pollutants with photo-excited hole as electron acceptor

Examples

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Embodiment 1

[0053] In this embodiment, the method for biologically enhanced treatment of refractory organic pollutants based on photoexcited holes as electron acceptors includes the following operations:

[0054] Schematic diagram of the photo-excited hole-enhanced bioreactor figure 1 As shown, the enhanced biological system is fixed by loading BiVO 4 The carbon paper of the / FeOOH composite semiconductor material is immersed in the quartz reactor 2, the size of the quartz reactor is 4.5×4.5×7.5 cm, and the volume is 150 mL.

[0055] The present invention adopts semiconductor immobilization technology to BiVO 4 / FeOOH compound semiconductor material 4 was immobilized on a carbon paper support (CP, 4 × 4 cm) to form BiVO 4 / FeOOH@CP; then by inoculating anaerobic sludge into the reactor in advance, using the sludge domestication, the BiVO4 / FeOOH composite semiconductor surface is loaded with biofilm 3, and a photo-excited hole-enhanced biological system is constructed.

[0056] Specific...

Embodiment 2

[0064] This example is basically the same as Example 1. In actual operation, pyridine simulated wastewater is added to the light-excited hole-enhanced biological system, and the sequential batch degradation is carried out in a period of two days. Pyridine simulated wastewater contains pyridine, buffer solution, inorganic salts, trace elements, etc.

[0065] Different reactors are configured according to the method in Example 1, and different experimental groups are set: the reactor configured with blank carbon paper to operate under light but not loaded with biofilm is named R con ; The reactor configured with blank carbon paper to operate under light and loaded with biofilm is named R bio ; A reactor configured with semiconducting materials operating under light but not loaded with biofilm is named R pho ; A reactor configured with semiconducting material and loaded with biofilm but not operated under light is named R pho-bio-dark ; The reactor configured with semiconducting ...

Embodiment 3

[0073] In this embodiment, different masking agents are used to explore the role of photo-excited holes, superoxide radicals and hydroxyl radicals in photo-excited holes-enhanced biological systems.

[0074] Under the excitation of light, the semiconductor material generates photoexcited electron-hole pairs, and the photoexcited electron-hole pairs can generate superoxide radicals and hydroxyl radicals with oxygen and water. Such as Figure 5 As shown, different masking agents were used to explore the role of photo-excited holes, superoxide radicals and hydroxyl radicals in photo-excited holes-enhanced biological systems. Methanol (MET) and isopropanol (IPA) were used as masking agents for photo-excited holes and hydroxyl radicals, respectively. In order to explore the role of superoxide radicals in photo-excited holes-enhanced biological systems, the solution was filled with nitrogen (N 2 ) for 15 minutes to ensure the removal of possible dissolved oxygen in the system. Aft...

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Abstract

The invention belongs to the technical field of sewage treatment, and discloses a method for biological enhancement treatment of refractory organic pollutants with a photo-excited hole as an electronacceptor. The method comprises the following steps: 1) putting a composite semiconductor-coated carrier material into a reactor, introducing wastewater into the reactor inoculated with anaerobic sludge, and allowing the composite semiconductor-coated carrier material to be immersed in the wastewater, wherein the composite semiconductor-coated carrier material comprises a conductive carrier and a composite semiconductor material loaded on the conductive carrier; 2) carrying out habituated culture on the anaerobic sludge for a period of time, and loading a biological membrane on the surface of the composite semiconductor material to construct a photo-excited hole enhanced bioreactor; and 3) treating the refractory pollutants in the wastewater by utilizing the reactor under an illumination condition. According to the method disclosed by the invention, a semiconductor photocatalysis technology is coupled with a biological treatment technology, and the enhanced degradation of the organic pollutants in the wastewater is enhanced by utilizing the synergistic reaction of a semiconductor material and microorganisms, so degradation efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the sewage treatment technology, and relates to a method for biointensive treatment of refractory organic pollutants based on light-excited holes as electron acceptors. Background technique [0002] Biological treatment technology is widely used in the field of industrial wastewater treatment due to its convenient operation, low cost and environmental friendliness. As one of the commonly used technologies for wastewater treatment, aerobic biotechnology has the characteristics of high treatment efficiency, short degradation cycle and good effluent quality. However, the pollutants contained in industrial wastewater often have the characteristics of high concentration, high toxicity and refractory biodegradation. When industrial wastewater contains high concentrations of volatile organic pollutants (VOCs), it will not only easily lead to the collapse of aerobic biological systems, but also Cause pollutants to volatilize in the ai...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F101/30C02F101/38C02F101/36C02F1/30
CPCC02F3/1268C02F1/30C02F2101/30C02F2101/38C02F2101/36Y02W10/10Y02W10/37C02F1/725C02F2101/345C25D9/08C02F2305/10C02F2101/322C02F2101/305C02F3/106C02F3/2806C02F3/2853
Inventor 江心白施鹤飞沈锦优陈丹侯成
Owner NANJING UNIV OF SCI & TECH
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