Urban sewage strengthening treatment method in cold area based on multi-point feed water adjustment

Abstract

The invention discloses an urban sewage strengthening treatment method in a cold area based on multi-point feed water adjustment, which relates to an urban sewage strengthening treatment method and solves the problems of incapability of synchronous and efficient denitrogenation and dephosphorization, poor treatment effect, high running cost and unsuitability for treating urban sewage in the cold area in the traditional technology of treating the urban sewage. The method comprises the following steps of: firstly, primary precipitation of sewage: dividing effluent of a primary settling tank into two parts or three parts through a distribution well for distribution; and secondly, synchronously introducing the effluent mixing liquid of an anaerobic tank and an anoxic tank 1 and the reflowing sludge at the head end of an aerobic tank into the aerobic tank, introducing the effluent of the aerobic tank into an anoxic tank 2, introducing the effluent of the anoxic tank 2 into a secondary settling tank through water drop, discharging a supernatant as treated purified water, reflowing a part of sludge at the lower layer, and discharging the rest as the remaining sludge. The invention can synchronously carry out efficient denitrogenation and dephosphorization, has favorable treatment effect and low running cost and is suitable for treating the urban sewage in the cold area.

Description

technical field

[0001] The invention relates to a method for intensified treatment of urban sewage. Background technique

[0002] At present, the urban sewage treatment mainly adopts the biological activated sludge method, and there are many kinds of treatment processes in the biological activated sludge method. 2 / O nitrogen and phosphorus removal process, oxidation ditch process, etc. A 2 / O process, as the simplest simultaneous nitrogen and phosphorus removal process in the system, is widely used in domestic and foreign urban sewage biological nitrogen and phosphorus removal sewage treatment plants due to its stable effect and wide adaptability.

[0003] However, the process alternately operates three different environmental conditions of anaerobic, anoxic and aerobic, and different types of microbial flora such as phosphorus accumulating bacteria, denitrifying bacteria, and nitrifying bacteria coexist in the same sludge system, resulting in two major contradictions. ,...

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