Non-oxygen limit starting method for nitrosoation of low-ammonia nitrogen sewage part

Abstract

The invention discloses a non-oxygen limit starting method for nitrosoation of a low-ammonia nitrogen sewage part, belonging to the field of urban sewage treatment and reclamation. The non-oxygen limit starting method comprises the following steps: in an SBR (sequencing batch bioreactor), firstly inoculating nitrified sludge in an urban sewage plant, treating sewage with 120+ / -15mg / L of ammonia nitrogen under the condition that DO equals to 1.50-1.80mg / L, thereby realizing fast starting of nitrosoation within 25 days and achieving the nitrosoation rate by more than 90%; then reducing the concentration of the inlet ammonia nitrogen to be 35+ / -5mg / L which approaches the level of domestic sewage, and running under the condition of higher dissolved oxygen (DO equals to 1.20-1.50mg / L), thereby finally realizing the long-time and stable running of high dissolved oxygen (DO equals to 1.20-1.50mg / L) and low ammonia nitrogen sewage (35+ / -5mg / L) semi-nitrosoation and achieving the nitrosoation rate by more than 90%. According to the non-oxygen limit starting method, the difficulties that the low-ammonia nitrogen nitrosoation cannot be stably run for a long time and is low in treatment efficiency can be solved, the starting conditions are simple and fast, and the non-oxygen limit starting method has the advantages of higher sewage load, higher treatment efficiency, and the like.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and recycling. Specifically, it relates to a start-up method suitable for realizing partial nitrification of nitrification sludge under high dissolved oxygen (DO) and low ammonia nitrogen levels. Background technique [0002] Compared with other nitrogen removal technologies (such as physical methods, chemical methods, etc.), biological nitrogen removal technology has the characteristics of simple process, low cost, and easy promotion, so it is favored by people. However, due to the traditional biological denitrification technology and its improved process, there are still problems such as long hydraulic retention time and high infrastructure operation costs. Therefore, it is an important subject to effectively remove nitrogen in wastewater and provide scientific basis for controlling water pollution and protecting water environment to study new ideas, new technologies and suitable control c...

AI Technical Summary

Problems solved by technology

Most studies start nitrification by limiting oxygen, resulting in long oxidation time and low sludge load, especially in the later stage of stable operation with low ammonia nitrogen. Too low dissolved oxygen control is not conducive to long-term stable operation of nitrification

Studies by Peng Yongzhen and others have shown that low dissolved oxygen will reduce the nitrification rate, and the overall time of nitrification reaction will be longer, thereby increasing the volume of the reactor, increasing the investment in infrastructure, and under the condition of low dissolved oxygen, the activated sludge is easy to disintegrate and produce filamentous bacteria In addition, dissolved oxygen has a certain influence on the removal effect of other pollutants other than nitrogen.

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