Method for promoting anaerobic degradation of polycyclic aromatic hydrocarbons in wastewater by using biochar

Abstract

The invention belongs to the technical field of environmental engineering, and discloses a method for promoting anaerobic degradation of polycyclic aromatic hydrocarbon in wastewater by using biochar, which comprises the following steps: preparing biomass-based biochar; the method comprises the following steps: preparing an anaerobic fermentation bottle, and adding a certain amount of anaerobic sludge, a nutrient solution and polycyclic aromatic hydrocarbon wastewater into the bottle to form a polycyclic aromatic hydrocarbon-containing wastewater anaerobic biological treatment system; and adding the prepared biochar into a polycyclic aromatic hydrocarbon-containing wastewater anaerobic biological treatment system. According to the method, the self-made biochar is added into the wastewater anaerobic degradation system containing the polycyclic aromatic hydrocarbons, and the biotoxicity of the wastewater containing the polycyclic aromatic hydrocarbons can be remarkably reduced through the adsorption and promotion effects of the biochar, so that the adaptation of anaerobic microorganisms to the environment is accelerated, the system can be quickly started, organic pollutants such as the polycyclic aromatic hydrocarbons can be degraded, and the pollution to the environment is reduced. Moreover, oxygen-containing functional groups on the surface of the biochar may excite direct transfer of electrons among groups, so that the anaerobic degradation efficiency of the polycyclic aromatic hydrocarbon is improved, and the degradation of the polycyclic aromatic hydrocarbon and the anaerobic methane production process are promoted at the same time.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for promoting the anaerobic degradation of polycyclic aromatic hydrocarbons in wastewater by utilizing biochar. Background technique [0002] At present, polycyclic aromatic hydrocarbons (PAHs) are a class of organic pollutants with "three homogeneity" effects. Their high stability, strong hydrophobicity and refractory degradation make them accumulate in the environment continuously. Serious harm to the ecological environment and public health. Due to the development of large-scale industrial activities and improper waste disposal methods, PAHs substances are widely leaked into the environment, and PAHs pollution has become one of the important environmental problems to be solved urgently. [0003] The biodegradation of PAHs is mainly divided into aerobic degradation and anaerobic degradation. Since most of the sediments in rivers, lakes an...

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Problems solved by technology

[0007] Through the above analysis, the problems and defects of the existing technology are: the cost of the terminal electron acceptor that can be applied on a large scale is high, and adding it to the environment may cause secondary pollution.

At the same time, PAHs have an inhibitory effect on anaerobic microorganisms, resulting in problems of degradation and low energy production efficiency.

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