Operation mode and apparatus of short distance nitration-anaerobic ammoxidation batched biomembrane denitrogenation

Abstract

One kind of short range nitrifying-anaerobic aminoxidizing sequencing batch type denitrifying biomembrane mode and plant is disclosed. The limited aerating mode with real-time control of the sewage temperature inside the reactor and high frequency alternation between aeration and anaeration can inhibit the growth of nitrite oxidizing bacteria and denitrifying bacteria so that the aminoxidizing bacteria and the anaerobic aminoxidizing bacteria become the dominant bacteria in the nitrifying and denitrifying stages. In the nitrifying stage, nitrification is stopped in the nitrite step; and in the denitrifying stage, ammonia nitrogen acts as the direct electron donor to reduce nitrite. The plant is provided with fixed spherical composite stuffing with spherical shell of polypropylene and filled inside biological composite material. Sectional discrete water feeding mode is adopted to feed the sewage to be treated in four stages into the reactor.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and sewage treatment, and in particular relates to a short-range nitrification-anammox sequence batch biofilm denitrification operation mode and device. Background technique [0002] Traditional biological denitrification is mainly accomplished through two stages of nitrification and denitrification. In the nitrification stage, the conversion of ammonia nitrogen to nitrate nitrogen is divided into two consecutive reactions, first the conversion of ammonia nitrogen to nitrite by ammonia oxidizing bacteria, and then the conversion of nitrite to nitrate by nitrite oxidizing bacteria. This process has two deficiencies. First, it consumes a lot of energy. The ammonia nitrogen nitrification process requires additional energy to supply oxygen. The pre-denitrification system needs to be equipped with a relatively large reflux of the mixed liquid, which also increases energy consumption. ...

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Problems solved by technology

However, the existing short-range nitrification-ANAMMOX synergistic process still has the following problems: 1. The product nitrite itself of ammonia oxidation is a teratogenic, carcinogenic, and mutagenic substance, and it can also be combined with aromatic amines and other substances. reaction to generate other nitrosation by-products, which are more harmful to the receiving water body and human health; ②The growth temperature of ammonia oxidizing bacteria and anammox bacteria is relatively high. Reaction temperature, heat preservation of the reaction process requires more energy consumption; ③ Accumulation of nitrite concentration to a certain extent will have a toxic effect on ammonia oxidizing bacteria and anammox bacteria, thereby reducing the denitrification efficiency; ④ At present, there is only An industrial device based on the short-range nitrification-ANAMMOX synergy at the Dokhaven municipal wastewater treatment site in Rotterdam, the Netherlands, is in use. The composition of the device, because the short-cut nitrification and anammox are carried out in different containers, which increases the capital investment and floor space of the whole process

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