A combined biochemical process for in-situ remediation of black and odorous sediment contaminated by organic matter

Abstract

The invention provides a combined biochemical process for in-situ restoration of black and odorous bottom mud polluted by organic matter, comprising the following steps: S1, adding sodium acetate to the bottom mud; S2, adding calcium nitrate to the bottom mud. The beneficial effects of the present invention are: firstly, sodium acetate is added to the bottom mud, and the addition of sodium acetate provides an available carbon source for the microorganisms in the bottom mud, and the microorganisms reproduce and grow in large numbers while also inducing degradable PAHs (multiple Aromatic hydrocarbons) and TPH (total petroleum hydrocarbon pollution in soil) biological enzymes, under the enzymatic reaction, through the process of methanation and sulfate reduction, PAHs and TPH can be quickly degraded and removed; secondly, nitric acid is added to the sediment Calcium, the calcium nitrate added has the function of continuing to degrade low molecular weight organic matter, and has a good removal effect on low molecular weight organic matter; through the synergistic effect of two doses, the purpose of degrading organic matter with different molecular weight is finally achieved, and the difficult The removal target of degraded organic matter.

Description

technical field [0001] The invention relates to river bottom mud restoration, in particular to a combined biochemical process for in-situ restoration of black and odorous bottom mud polluted by organic matter in the river bottom mud restoration. Background technique [0002] Sediment is one of the important components of the river ecosystem. It is not only an important part of the nutrient cycle in the river, but also the main accumulation place of pollutants. A considerable part of refractory organic pollutants adheres to the sediment through chemical or physical actions such as adsorption and precipitation, forming sediment pollution. There is a dynamic balance of material exchange between the sediment and the water body. Under certain conditions, the pollutants in the sediment can be released to the overlying water body through desorption, dissolution, biodegradation, etc., which is an important source of secondary pollution of the water body. Therefore, while controllin...

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Problems solved by technology

[0004] Although the above technologies have achieved certain success, there are many types of nutrients that can be added, and the fluctuation range of dosage is large. Moreover, most of the organically polluted bottom sludge is in anaerobic state. While using microbial anaerobic degradation to remove organic matter , may produce other adverse environmental impacts, such as the aggravation of the reduced state of the sediment, the generation of hydrogen sulfide and reduced sulfides that cause black and odorous sediments, and the release of a large amount of gas generated by anaerobic metabolism that causes resuspension of the surface sediment, etc.

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