Apparatus and method of treating domestic wastewater by coupling low-oxygen nitration with short-cut denitrification and anaerobic ammonia oxidation

Abstract

An apparatus and a method of treating domestic wastewater by coupling low-oxygen nitration with short-cut denitrification and anaerobic ammonia oxidation. The invention belongs to the field of bio-treatment. The apparatus is mainly composed of a low-oxygen nitration reactor (SND-SBR) and an anoxic reactor (A-SBR). A part of domestic wastewater firstly flows into the SND-SBR reactor, and then synchronous nitration-denitrification effect in the system is enhanced by adding a filler, continuously feeding water and performing low-oxygen aeration; when ammonia nitrogen in the SND-SBR reactor is completely degraded, a supernatant containing low-concentration NO3-N and the rest of the domestic wastewater are pumped into the A-SBR at the same time; short-cut denitrification bacteria reduce the NO3-N into NO2-N by means of organic carbon sources in raw water, and anaerobic ammonium oxidation bacteria perform deep denitrification by means of the NO2-N and NH4<+>-N in the raw water. The apparatus and method utilize the carbon sources in raw water as most as possible and reduce treatment energy consumption, are simple and stable in operation and control, and achieve deep treatment of low C / N ratio domestic wastewater without external carbon sources.

Description

technical field [0001] The invention relates to a low-oxygen nitrification coupled short-range denitrification anaerobic ammonium oxidation device and method for treating domestic sewage, belonging to the technical field of biochemical sewage biological treatment. Combining the enriched and domesticated low dissolved oxygen nitrification reactor with the short-range denitrification anaerobic ammonium oxidation process, under the condition of no external carbon source, by optimizing the process parameters and influent flow distribution, the deep denitrification of the device can be realized while reducing the treatment cost. energy consumption. It is especially suitable for deep denitrification treatment of low C / N urban sewage and industrial wastewater. Background technique [0002] The activated sludge method is widely used to remove pollutants such as nitrogen and phosphorus in various types of sewage. The traditional biological denitrification process using the activated...

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Problems solved by technology

[0006] The purpose of the present invention is to address the two major technical problems of low treatment efficiency and high energy consumption in the treatment of low C / N urban sewage, combining domestication and enrichment of low dissolved oxygen nitrification sludge, simultaneous nitrification and denitrification and short-range denitrification anaerobic ammonia Oxidation combined with other key technologies, a device and method for advanced treatment of low C / N domestic sewage with energy saving and consumption reduction are proposed, that is, domestic sewage is divided into two streams and enters two SBRs in sequence, and in the first SBR, enrichment and domestication Low dissolved oxygen nitrifies sludge throughout the process, and at the same time optimizes the way of water intake to make full use of the organic carbon source in the first feed water to strengthen the synchronous nitrification and denitrification effect of the system; in the second SBR, the second stream of domestic sewage is firstly used The organic carbon source in the first SBR reactor reduces the nitrate nitrogen in the effluent to nitrite nitrogen, and then the anammox bacteria use the reduced product nitrite nitrogen and the ammonia nitrogen in the influent as substrates for autotrophy Nitrate removal, part of the nitrate nitrogen produced by the anaerobic ammonium oxidation reaction can be reduced to nitrite nitrogen in the next cycle and removed, so that the accumulation of nitrate nitrogen will not occur in the system, and the total nitrogen removal rate will be improved

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