Device and method for starting and maintaining short-cut nitrification by alternate side treatment of hydroxylamine and free nitrite

Abstract

The invention discloses a device and a method for starting and maintaining short-cut nitrification by alternate side treatment of hydroxylamine and free nitrite, and belongs to the field of sewage treatment. The device comprises a raw water tank, a sequencing batch reactor (SBR), a side treatment reactor and an automatic control system. The method comprises the following steps that: after a reactor starts whole-course nitrification, hydroxylamine with a certain concentration is added into a side reactor to treat sludge so as to promote the activity of ammonia oxidizing bacteria (AOB) and inhibit Nitrospira in nitrite oxidizing bacteria (NOB), then the sludge flows back to a mainstream reactor in batches, and short-course nitrification is started; then, FNA is added into the side reactor, the FNA has a relatively strong inhibition effect on Nitrobacter, and short-cut nitrification is consolidated; and the long-term maintenance of short-cut nitrification is realized by alternately adding hydroxylamine and FNA in the later stage. Short-cut nitrification can be started, the nitrite accumulation rate is high, and long-time operation is maintained. The device and the method have the advantages of quick starting, long-term nitrite supply and the like.

Description

technical field [0001] The invention relates to a device and method for starting and maintaining short-range nitrification through alternate side treatment of hydroxylamine and nitrite, which belongs to the field of sewage biological treatment and is suitable for biological denitrification of urban domestic sewage, especially the application of short-range nitrification related processes. Background technique [0002] In the process of urban domestic sewage treatment, due to the relatively low carbon and nitrogen in urban domestic sewage, insufficient carbon sources in the whole process of nitrification-denitrification technology will easily lead to incomplete denitrification and affect the efficiency of nitrogen removal, so it is often necessary to add additional carbon sources , and the whole process of nitrification requires long-term aeration, which consumes relatively large energy and does not meet the requirements of sustainable development. [0003] Short-cut nitrific...

AI Technical Summary

Problems solved by technology

[0005] According to previous studies, mainstream dosing of hydroxylamine and FNA have strong inhibitory effects on Nitrospira and Nitrobacter in NOB respectively, but since both are reversible inhibitory effects, it is impossible to achieve long-term maintenance by adding one alone.

At the same time, when the concentration of hydroxylamine and FNA is high, it will affect AOB, and the cost of hydroxylamine is high, so a new method is needed to maintain the operation of short-range nitrification

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