Device and method for realizing partial short-range nitrification-anaerobic ammonia oxidation by adding hydroxylamine

Abstract

The invention discloses a device and a method for realizing partial short-range nitrification-anaerobic ammonia oxidation by adding hydroxylamine, and belongs to the field of urban domestic sewage biological treatment. For two-stage partial short-range nitrification-anaerobic ammonia oxidation, the stable operation of the short-range nitrification is crucial to a process; the short-range nitrification is very difficult to start and maintain stably only through process parameter control; a very good nitrite accumulating effect can be achieved by adding the hydroxylamine in the patent; partial short-range nitrification reactors can be started and high nitrite accumulation can be maintained within a short time. The hydroxylamine serves as an intermediate product in a nitrifying process, is a reducing agent of ammonia monooxygenase and a stimulating agent of AOB (Ammonia Oxidizing Bacteria) and can improve the cell yield of the AOB; meanwhile, the hydroxylamine is an inhibiting agent of NOB (Nitrite Oxidizing Bacteria) and can elutriate the NOB. Compared with a conventional denitrogenation process, a partial short-range nitrification-anaerobic ammonia oxidation process can save aeration quantity and carbon source, and is particularly suitable for urban domestic sewage with low C / N.

Description

technical field [0001] The device and method related to adding hydroxylamine to realize partial short-range nitrification-anammox, belonging to the field of sewage biological treatment, are especially suitable for denitrification of urban domestic sewage with low C / N. Background technique [0002] For urban sewage treatment, the traditional nitrification / denitrification denitrification technology has the bottleneck problem of insufficient carbon sources. The discovery and verification of anammox technology has opened a new chapter for sewage denitrification. The anaerobic ammonium oxidation process generates nitrogen gas from ammonia nitrogen and nitrite under anaerobic conditions, and a stable source of nitrite is a key issue in this technology. [0003] The traditional nitrification process is carried out in two steps. First, the ammonia nitrogen in the sewage is oxidized to nitrite under the action of ammonia oxidizing bacteria (AOB), and then nitrite is oxidized to nitri...

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Problems solved by technology

[0004] However, these methods have certain limitations: (1) For urban sewage with a large amount of water, the short-range comparative energy consumption is achieved through high temperature; (2) If the low DO is controlled, the nitrification rate will be reduced, and the activated sludge is prone to sludge bulking; ( 3) For the influence of pH, during the nitrification process, the pH is constantly decreasing, and the system must maintain a higher pH by continuously adding alkali

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