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Method for reducing adverse effect of nano-zinc oxide on anaerobic biological treatment of sewage

A technology of nano-zinc oxide and anaerobic organisms, applied in the field of reducing the toxicity of ZnONPs to anaerobic biological treatment of sewage, can solve the problems of reducing the toxicity of ZnONPs, changing the characteristics of nanomaterials, affecting the scope and effect of use, and reducing adverse effects and strengthening Resilience, the effect of easy operation

Active Publication Date: 2018-12-18
ENERGY RES INST OF SHANDONG ACAD OF SCI
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Problems solved by technology

However, the doping of nanomaterials may change the characteristics of nanomaterials themselves, affecting their range of use and effects.
These studies are all based on the source of pollution. The method of reducing the biological toxicity of ZnO NPs obviously has certain limitations, so it is necessary to find another way to find a new method to reduce the toxicity of ZnO NPs

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  • Method for reducing adverse effect of nano-zinc oxide on anaerobic biological treatment of sewage

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Embodiment 1（

[0020] Embodiment 1 (comparative example): a kind of method that is used to reduce the adverse effect of nano-zinc oxide on sewage anaerobic biological treatment, it is to carry out according to the following steps: first will be taken from the particle sewage in the reactor of processing citric acid waste water Sludge was domesticated in laboratory upflow anaerobic sludge bed (UASB, effective volume 4L), and the domestication nutrient solution was composed of carbon sources (glucose, alcohol, sodium acetate, sodium propionate and sodium butyrate, various carbon sources COD equal concentration), nitrogen source (NH 4 Cl), phosphorus source (KH 2 PO 4 and K 2 HPO 4 ) and water, the nutrient solution C:N:P=100:5:1, the initial pH is 6.8-7.6. The other main trace elements N, P, Ca, Mg, Fe come from NH 4 Cl, KH 2 PO 4 , CaCl 2 , MgCl 2 ·6H 2 O, FeCl 3 , the concentration is 1000, 500, 200, 200, 50 mg / L. Acclimatization process: The initial COD of acclimatization nutrie...

Embodiment 2（

[0023] Embodiment 2 (comparative example): a kind of method that is used to reduce the adverse effect of nano-zinc oxide on sewage anaerobic biological treatment is carried out as follows: first according to the domestication mode of embodiment 1, the inoculum slime that domestication is good is added to reaction In the container (serum bottle), the TS concentration was 1500 mg / L, and then the fermentation nutrient solution and ZnO NPs dispersion were added to the serum bottle, and the effective volume of the mixed phase was 400 mL. The fermentation nutrient solution is composed of carbon source (glucose and sodium acetate, COD ratio is 1:1), nitrogen source (NH 4 Cl), phosphorus source (KH 2 PO 4 and K 2 HPO 4 ) and water, the fermentation nutrient solution C:N:P=100:5:1, the initial pH is 7.0±0.2, the COD is 3000 mg / L; the particle size of ZnO NPs is controlled to be 50-100 nm, and the exposure of ZnO NPs The concentration is 30 mg / g-TS. After removing the oxygen in the...

Embodiment 3

[0025] Embodiment 3: a kind of method that is used to reduce the adverse effect of nano-zinc oxide on the anaerobic biological treatment of sewage, it is carried out as follows: first according to the domestication mode of embodiment 1, the inoculum slime that domestication is good is added to reactor ( serum bottle), the TS concentration was 1500 mg / L, then the fermentation nutrient solution and ZnO NPs dispersion were added to the serum bottle, and finally Fe 3 o 4 NPs dispersion, the effective volume of the obtained mixed phase is 400 mL. The fermentation nutrient solution is composed of carbon source (glucose and sodium acetate, COD ratio is 1:1), nitrogen source (NH 4 Cl), phosphorus source (KH 2 PO 4 and K 2 HPO 4 ) and water, the fermentation nutrient solution C:N:P=100:5:1, the initial pH is 7.0±0.2, the COD is 3000 mg / L; the particle size of ZnO NPs is controlled to be 50-100 nm, and the exposure of ZnO NPs The concentration is 30 mg / g-TS; control Fe 3 o 4 Th...

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Abstract

The invention relates to a method for reducing the adverse effect of nano-zinc oxide on anaerobic biological treatment of sewage. The method includes: acclimation culture of inoculation sludge, preparation of dispersion liquid, anaerobic digestion and other steps. Nano-ferriferrous oxide can partially hinder the effective contact of nano-zinc oxide and microorganisms and strengthen the resistanceof extracellular polymers to nano-zinc oxide, the common ion effect between iron ions and zinc ions weakens the dissolution of zinc ions and the biotoxicity thereof, thus reducing the adverse effectsof nano-zinc oxide on anaerobic biological treatment of sewage. And further the action conditions of nano-ferriferrous oxide are controlled to establish an inter-species direct electron transfer approach between acid-forming bacteria and methanogens so as to optimize the methanation process, thus reaching the purpose of reducing the adverse effect of nano-zinc oxide on anaerobic biological treatment of sewage.

Description

technical field [0001] The invention belongs to the technical field of biological treatment of sewage (waste) water, and specifically relates to a 3 o 4 NPs) in a sewage anaerobic biological treatment system stressed by nano-zinc oxide (ZnO NPs) a new method to significantly reduce the toxicity of ZnONPs to sewage anaerobic biological treatment. Background technique [0002] As an emerging pollution source, nanomaterial pollutants have gradually attracted the attention of environmental workers around the world, especially the wide application of ZnO NPs makes them leak into the water environment during production, transportation, use and disposal or due to pollution accidents. in the residual sludge of the sewage treatment plant. The treatment of sewage / sludge by anaerobic digestion technology is a sustainable biological treatment method, which can simultaneously realize pollution control and energy recovery, but ZnO NPs will have a certain impact on the anaerobic digesti...

Claims

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Application Information

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IPC IPC(8): C02F3/28
CPCC02F3/28
Inventor 牧辉赵春辉郭红红张晓东华栋梁赵玉晓李岩许海朋
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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