Method suitable for low-ammonia-nitrogen SBR nitrosation recovery

Abstract

A method suitable for low-ammonia-nitrogen SBR nitrosation recovery belongs to the municipal sewage processing and recycling fields. The method which aims at the characteristics comprising sensitiveness to the ambient condition, easy turning to the whole course nitration, and nitrosation loss of a nitrosation technology comprises the following steps: placing sludge destroyed after long-term stable operation in SBR; adopting continuous aeration, determining the three-nitrogen concentration until all ammonia nitrogen is consumed, and setting the time at which the ammoxidation rate is 20-50% as the aeration time; carrying out preposition anaerobic ammoxidation for a time accounting for 1 / 3 of the aeration time, wherein the dissolved oxygen is maintained in a range of 0.2-0.5mg / L through controlling the aeration rate and the ammoxidation rate is controlled in a range of 20-50% through controlling the aeration time in the aeration process; and continuously and stably operating under the above conditions for above 14 periods taking 7 days. The method realizes the rapid recovery of the nitrosation performances under a normal-temperature low-ammonia-nitrogen condition, and provides guarantees for the stable operation of the nitrosation and the accident recovery.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and recycling. Specifically relate to a kind of recovery method applicable to low ammonia nitrogen SBR nitrosation Background technique [0002] In recent years, nitrogen pollution and eutrophication of water bodies have become increasingly serious, causing huge economic losses to human industrial and agricultural production. Countries around the world have formulated more stringent discharge standards for urban sewage treatment plants. In the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB18918-2002), which was implemented in July 2003 in my country, the first-level A discharge standard stipulates that NH in the effluent 4 + -N≤5mg / L, TN≤15mg / L. However, the traditional nitrification / denitrification biological denitrification process not only has problems such as long process, high oxygen supply, need for additional carbon source, and high sludge production, but cannot...

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Problems solved by technology

[0004] However, there is no conclusion on the stable maintenance of nitrosation, especially the long-term operation under normal temperature and low ammonia nitrogen conditions will often lead to the deterioration, destruction or even collapse of nitrosation

After the collapse, the nitrosation rate decreased, and a large amount of nitrate nitrogen was generated, which could not provide stable effluent for subsequent processes.

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