Nitrogen and phosphorus removal device for coupling iron-carbon micro-electrolysis with endogenous denitrification/anaerobic ammonia oxidation and method thereof

Abstract

The invention discloses a nitrogen and phosphorus removal device for iron-carbon micro-electrolysis coupled endogenous denitrification / anaerobic ammonia oxidation and a method thereof. The device comprises a raw water tank, an iron-carbon micro-electrolysis coupled anaerobic ammonia oxidation reactor, a phosphorus and organic matter removal water outlet tank, a short-cut nitrification reactor and a short-cut nitrification water outlet tank. According to the method, the urban sewage is treated by coupling an iron-carbon micro-electrolysis technology with an anaerobic ammonia oxidation process, and zero-valent iron in an iron-carbon raw material and ferrous ions generated by reaction of a primary battery are coordinated to serve as electron donors to reduce nitrate nitrogen to generate nitrogen while synchronous nitrogen and phosphorus removal is realized, so that the nitrogen conversion process is effectively participated. Meanwhile, iron ions can be combined with negatively charged microbial cells through electrostatic neutralization to promote the formation of microbial aggregates, so that the granulation process of the anaerobic ammonia oxidation sludge is accelerated. In the iron-carbon micro-electrolysis dephosphorization process, dissolved oxygen in the wastewater is absorbed, and an anaerobic environment is created for an endogenous denitrification / anaerobic ammonia oxidation process.

Description

technical field [0001] The application belongs to the technical field of sewage biological treatment, and specifically relates to an iron-carbon micro-electrolysis coupled endogenous denitrification / anaerobic ammonium oxidation nitrogen and phosphorus removal device and method. Background technique [0002] Phosphate discharge is one of the main factors of water eutrophication. At present, there are still big problems in the removal of phosphate in sewage treatment. At present, biological methods, chemical precipitation methods and adsorption methods are mostly used for phosphorus removal. Biological phosphorus removal has high requirements on temperature, carbon source and sludge age, etc., and requires a certain level of operation and maintenance management; chemical precipitation phosphorus removal requires a large amount of chemicals and will generate more sludge; The adsorbent is easily saturated and needs to be regenerated. Compared with the traditional dephosphoriza...

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Problems solved by technology

And because the actual urban sewage C / N ratio is often low, it may not be enough to meet the carbon source required for denitrification, and additional carbon sources need to be supplemented, which not only increases the treatment cost, but also easily produces organic residues and additives

In addition, because the actual urban sewage water quality and quantity fluctuate greatly, and the organic matter composition is relatively complex, when the concentration of organic matter in the environment is too high or fluctuates, the competition between denitrifying bacteria and anammox bacteria for substrate substrates and living space will become more intense. It is more intense, and it is prone to problems of system instability and poor water quality.

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