Device for treating municipal sewage by carbon separation coupled mainstream anaerobic ammonia oxidation biological denitrification and operation method thereof

Abstract

The invention relates to a device for treating municipal sewage by carbon separation coupled mainstream anaerobic ammonia oxidation biological denitrification and an operation method of the device. The device consists of five main parts, namely a high-load carbon separation reaction tank, a first sedimentation tank, a mainstream anaerobic ammonia oxidation reaction tank, a second sedimentation tank and a sludge anaerobic digestion capacity unit, wherein the mainstream anaerobic ammonia oxidation reaction tank is sequentially divided into an anoxic zone, a main PN/A zone, a nitrogen polishing zone and a degassing zone. Most of organic pollutants are separated and recycled in the high-load carbon separation reaction tank for capacity utilization, and nitrogen in sewage is removed through denitrification of the anoxic zone, partial nitrosation/anaerobic ammonia oxidation of the main PNA zone and multi-mode purification of a nitrogen polishing zone. The device and the operation method havethe advantages of sewage potential recycling, stable operation, excellent effluent quality, low energy consumption and material consumption and the like, and are a new device and a new process suitable for urban sewage treatment.

Description

technical field [0001] The invention relates to the technical field of urban sewage treatment, in particular to a carbon separation coupled mainstream anaerobic ammonium oxidation biological denitrification device for urban sewage treatment and an operating method thereof. Background technique [0002] Urban sewage is rich in organic matter and can be considered as a potential energy source. The potential of organic matter in sewage is about 14.7-28.7kJ / gCOD. Taking the common urban sewage COD concentration of 300mg / L as an example, its organic matter energy can reach 1.2ˉ2.4kWh / m 3 . The energy consumption of conventional sewage treatment process is about 0.3ˉ0.7kWh / m 3 , if the organic matter in the sewage can be effectively recycled, it is possible to achieve energy self-sufficiency in the sewage treatment process. However, in conventional sewage treatment, the removal of inorganic nutrients such as nitrogen and phosphorus that can cause eutrophication must rely on org...

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Problems solved by technology

The mainstream anaerobic ammonium oxidation process is still in the experimental research stage, and the current research progress in the world is only limited to pilot-scale research, and has not been able to realize real engineering applications. The main difficulties in its application include: (1) in urban sewage The low nitrogen concentration is not conducive to the inhibition of nitrite oxidizing bacteria (NOB) in the system, resulting in limited denitrification performance; (2) The low temperature conditions of urban sewage have a great impact on the activity of anammox bacteria. The denitrification efficiency is not high; (3) The effluent ammonia nitrogen and total nitrogen in the current mainstream anammox research are generally high, it is difficult to stably meet the discharge standards of urban sewage treatment plants, and there is no alternative to the existing biological denitrification process Mature technical solutions

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