Method for treating sludge digestion liquid by coupling short-cut nitrification/anaerobic ammonia oxidation-fermentation short-cut denitrification/anaerobic ammonia oxidation and device thereof

Abstract

The invention discloses a method for treating sludge digestion liquid by coupling short-cut nitrification / anaerobic ammonia oxidation-fermentation with short-cut denitrification / anaerobic ammonia oxidation and a device thereof, and belongs to the field of biochemical treatment of sludge digestion liquid. The method comprises the following steps: after sludge digestion liquid enters an SBR, removing organic matters in raw water and residual nitrate nitrogen in the last period through heterotrophic bacteria and denitrifying bacteria by adopting a pre-anoxic / aerobic / anoxic operation mode, removing part of total nitrogen in the raw water through ammonia oxidizing bacteria and anaerobic ammonium oxidizing bacteria on a biological membrane, and enabling an effluent to enter a UASB reactor, and further reducing the total nitrogen in the effluent through the combined action of hydrolytic acidification bacteria, denitrifying bacteria and anaerobic ammonium oxidation bacteria in the granular sludge. According to the invention, an additional carbon source is not needed, the aeration energy consumption is saved, the emission of greenhouse gases can be reduced, the problem of unstable denitrification effect of the system caused by easy loss of anaerobic ammonia oxidation sludge is solved by utilizing the biological membrane and the granular sludge, the denitrification load and stability of the system are improved, and the deep denitrification of the sludge digestion liquid and the reduction and recycling of the sludge are realized.

Description

technical field [0001] The invention relates to a method and device for treating sludge digestion liquid and disposing of excess sludge based on short-range nitrification / anammox-fermentation coupled short-range denitrification / anammox process, which belongs to the biochemical treatment of sludge digestion liquid and sludge reduction technology field. Firstly, semi-short-cut nitrification is realized by controlling aeration in the SBR reactor, followed by autotrophic denitrification by anammox, and finally the coupling of sludge fermentation, short-cut denitrification and anammox is realized in the UASB reactor. In the case of carbon source, the purpose of deep denitrification of sludge digestion liquid is achieved, and sludge reduction and resource utilization are realized. At the same time, the biofilm and granular sludge in the reactor also enhance the stability of the system. This technology is suitable for advanced treatment of sludge digestion liquid and sludge reductio...

AI Technical Summary

Problems solved by technology

The present invention uses biofilm and granular sludge to solve the problem of unstable denitrification effect of the system due to the easy loss of anammox sludge, improves the denitrification load and stability of the system, and realizes deep denitrification of sludge digested liquid and sludge reduction and resource utilization, while reducing the amount of external carbon sources and aeration, and reducing the treatment cost of wastewater with high ammonia nitrogen and low C / N ratio

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