Method for synchronously realizing sewage denitrification and biogas desulfurization

Abstract

The invention relates to the technical field of sewage treatment, and concretely relates to a method for synchronously realizing sewage denitrification and biogas desulfurization. The method comprisesthe following processes: internal carbon source removal treatment, preliminary denitrification treatment, and sewage denitrification and biogas desulfurization synchronous decoupling treatment. In the process of the internal carbon source removal treatment, a nitrate acting as an electron acceptor can metabolize the self carbon source of sludge; in the process of preliminary denitrification treatment, methane used as an electron donor is used for domesticating and cultivating methane-denitrifying bacteria to achieve anaerobic methane oxidation-based nitrate denitrification; and in the processof sewage denitrification and biogas desulfurization simultaneous coupling treatment, hydrogen sulfide and methane in biogas, which act as a common electron donor enrich autotrophic denitrifying bacteria in the presence of anaerobic methane-oxidizing bacteria, and provide a good environment for the co-growth of the autotrophic denitrifying bacteria and anaerobic methane-oxidizing bacteria in order to realize the coupling of the two processes of sewage denitrification and biogas desulfurization.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for synchronously realizing sewage denitrification and biogas desulfurization. Background technique [0002] With the rapid development of the economy and the gradual improvement of people's living standards, the problem of water pollution has become increasingly prominent. Nitrogen is an essential element for the growth of microorganisms and plants. Nitrogen in sewage mainly comes from urban domestic sewage and industrial sewage. In addition to organic nitrogen and ammonia nitrogen, it also contains nitrate nitrogen and nitrite nitrogen. Direct discharge of a large amount of nitrogen-containing sewage into the environment will exceed the environmental load of the receiving water body, and nitrogen-containing sewage will also cause eutrophication of the water body, resulting in excessive growth of algae, mass death of fish due to suffocation, and easy occurrence...

AI Technical Summary

Problems solved by technology

The physical desulfurization process is suitable for biogas desulfurization devices with low sulfur content and low flow rate. The biogas is passed into the desulfurization tower containing adsorbents such as iron oxide or activated carbon to absorb hydrogen sulfide in the biogas, but the formed elemental sulfur will block the The desulfurization agent needs to be replaced regularly, and the cost is relatively high; the chemical desulfurization technology uses lye to absorb hydrogen sulfide in the biogas, so as to achieve the effect of removal, mainly including ammonia method, carbonate method and amine method, etc., but this Such chemicals also need to be replaced and recycled regularly, and are corrosive to equipment such as pipelines; biological desulfurization technology uses the metabolism of microorganisms to oxidize sulfide in biogas to elemental sulfur and sulfate, which is low in cost and easy to operate and maintain , but need to add additional substances such as nitrate for the use of microorganisms

[0005] To sum up, the current sewage denitrification and biogas desulfurization processes have certain disadvantages, and it is impossible to efficiently and simultaneously realize sewage denitrification and biogas desulfurization without adding additional carbon sources

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