A<2>/O-BCO improvement process utilizing fermented sludge

Abstract

The invention discloses an A<2> / O-BCO improvement process utilizing fermented sludge, and belongs to the technical field of biological treatment of sewage. The process comprises the following steps: mixing fermentation liquid with domestic sewage in an A<2> / O for anaerobic reaction, mixing the fermentation liquid and domestic sewage mixture with nitrification liquid for denitrification and dephosphorization reaction under an anoxic condition, carrying out aerobic treatment, then separating the material from a plate sedimentation tank, and respectively obtaining supernate and sludge; placing the supernate into a biological contact oxidation pond with carbon fiber, carrying out short-range nitrification reaction under an aerobic condition, putting reaction liquid subjected to the nitrification reaction into a sedimentation region, and respectively obtaining nitrification liquid and sludge; mixing the sludge separated from the plate sedimentation tank and the sludge obtained from the sedimentation region with alkaline solution for fermentation, and obtaining fermentation liquid. According to the A<2> / O-BCO improvement process, weight reduction and recycling of the sludge can be realized in a sewage treatment process, and the trouble that low C / N is poorer than the sewage treatment effect due to shortage of carbon sources is solved.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and specifically relates to the technical field of sludge fermentation coupled with short-range nitrification and denitrification phosphorus removal and enhanced carbon source development. Background technique [0002] In recent years, sewage nitrogen and phosphorus removal processes have emerged in an endless stream, but due to the contradictions of carbon source, sludge age, nitrification and denitrification capacity, etc., especially in the treatment of low C / N sewage, the problem of insufficient carbon source makes simultaneous nitrogen and phosphorus removal particularly difficult. Most sewage treatment plants mainly consider adding carbon sources or adding industrial wastewater rich in biodegradable organic matter to urban sewage. Studies have shown that the treatment cost of external carbon sources accounts for about 10% of the operation and management cost, which incre...

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Problems solved by technology

[0006] Aiming at the problems of low influent C / N, unstable denitrification and phosphorus removal efficiency, large sludge output, and high energy consumption in operation in the current sewage treatment, the present invention proposes an A 2 / O - BCO Modified Process

[0008] The invention rationally couples sludge fermentation and short-range denitrification and phosphorus removal technology, not only solves the problem of sludge treatment, but also realizes sludge reduction and resource utilization in the process of sewage treatment, and at the same time gets rid of the low energy consumption caused by the shortage of carbon sources. Dilemma of low C / N ratio sewage treatment effect

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