A device for removing nitrogenous substances in water by biological denitrification

Abstract

The invention provides a method for removing a nitrogen substance in water by biological denitrification. The device is formed by a groups of biological denitrification reactors which are connected in series, wherein the bottom of each biological denitrification reactor is provided with a water inlet pipe (1); a water outlet (2) is formed in the upper part of the lateral wall; a stirring device (3) is arranged inside each biological denitrification reactor; a filter layer (4) filled with composite filter is arranged inside each biological denitrification reactor; and the composite filter is formed by iron powder, activated carbon and magnet powder in a mixing manner according to the volume ratio of (2-6) to (2-3) to 1. The device is compact in structure, convenient to use, flexible to run, and wide in application range, mainly depends on the denitrification process of microorganisms, can well meet the removal requirements aiming at the nitrogen substance, particularly nitrate at present, simultaneously can remove the substances such as ammonia nitrogen and the like, and has good popularization and application prospects.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a novel device for strengthening biological denitrification to remove nitrogenous substances in water. Background technique [0002] In recent years, nitrogen pollution in the field of water treatment has become one of the social hot spots. On the one hand, the total nitrogen content in the effluent of urban sewage plants is too high (among which nitrate nitrogen accounts for the majority), affecting the overall water quality of the effluent. On the other hand, the nitrate content in groundwater in quite a few areas of China is too high, exceeding the current drinking Water sanitation standard (G5749-2006) limit value requirements, thus affecting the water quality safety of drinking water. Therefore, the removal of nitrogen in water has become one of the key issues in the field of water treatment. How to remove nitrate nitrogen from water economically, efficiently and safely is o...

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Problems solved by technology

The chemical reduction method mainly uses reducing agents to reduce nitrate nitrogen. According to the different reducing agents used, it can be divided into active metal reduction method and catalytic reduction method; the former uses iron, aluminum, zinc and other metal elements as reducing agents, and the treatment effect is better. Poor, and there will be nitrite formation, the latter uses hydrogen, formic acid, methanol, etc. as reducing agents, and generally requires the presence of a catalyst to make the reaction proceed, the cost is high, and there is a security risk in the application of hydrogen; reverse osmosis, Although electrodialysis, ion exchange and other methods can effectively remove nitrate in water, the cost is high, and a large amount of waste water will be generated at the same time, so they are rarely used in actual engineering

Biological denitrification has attracted widespread attention due to its low treatment cost, but this method is limited by carbon sources in advanced sewage treatment and groundwater treatment, and the removal effect is not ideal. Usually, it is necessary to improve the removal of nitrate by adding an external carbon source or by supplying hydrogen. Removal effect, such as adding methanol, acetic acid, glucose and other organic carbon sources or hydrogen generated by electrolysis to strengthen the denitrification of activated carbon; The most important method of substances, how to reduce the dosage of organic carbon sources and ensure the quality of effluent water through process optimization is the focus of current research

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