Biochemical process for in-situ remediation of black and odorous sediments polluted by organic matters

Abstract

The invention provides a biochemical process for in-situ remediation of black and odorous sediments polluted by organic matters. The biochemical process comprises the following steps: S1, adding sodium acetate into the sediments; S2, adding calcium nitrate into the sediments. The biochemical process has the beneficial effects that firstly, sodium acetate are added into the sediments, so that available carbon sources are provided for microorganisms in the sediments, bio-enzymes capable of degrading PAHs (polycyclic aromatic hydrocarbons) and TPH (total petroleum hydrocarbons) are induced while a large quantity of the microorganisms reproduce and grow, and PAHs and TPH are quickly degraded and removed by adopting a methane production process and a sulfate reduction process under the enzymatic reaction; secondly, calcium nitrate is added into the sediments while the effect of continuously degrading low-molecular-weight organic matters and a relatively good removal effect on the low-molecular-weight organic matters are achieved; the purposes of degrading organic matters with different molecular weight and removing difficultly degraded organic matters from the sediments are achieved through the synergistic effect of sodium acetate and calcium nitrate.

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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