Method for implementing rapid start of short-cut nitrification and denitrification to treat wastewater by preposed pre-oxidation

Abstract

The invention relates to a method for implementing rapid start of short-cut nitrification and denitrification to treat wastewater by preposed pre-oxidation. In the method, before short-cut nitrification and denitrification processing is carried out on high ammonia-nitrogen wastewater, organic acid is added into the wastewater to carry out pre-oxidation on the wastewater. According to the method, by adding the organic acid, hydrogen ions are provided for a reaction system; the organic acid is combined with nitrate contained in the high ammonia-nitrogen wastewater to form an acidic oxidation environment; conversion from nonbiodegradable macromolecular substances to small molecular substances capable of being utilized by microorganisms is promoted; organisms which are toxic and harmful to ammonia-oxidizing bacteria are subjected to ring opening or chain breaking and are decomposed into small molecules; on one hand, the pre-oxidation process can reduce toxicity of the wastewater on the microorganisms, improve biodegradability of the wastewater and provide an excellent external environment for short-cut nitrification and denitrification of floras, and on the other hand, the pre-oxidation process also can provide a carbon source for the subsequent nitrification process.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for quickly starting short-range nitrification and denitrification reactions by pre-adding acid and pre-oxidizing in the wastewater treatment process. Background technique [0002] Refining catalyst production wastewater is mainly wastewater produced by heavy oil catalytic cracking catalysts. The production process uses a large amount of ammonium salt and ammonia water. High ammonia nitrogen wastewater is an inevitable product of the oil refining catalyst production process. Catalyst wastewater is characterized by complex water quality, high concentration of suspended solids and ammonia nitrogen, large fluctuation range (60mg / L-300mg / L), complex composition and low B / C value, making it difficult to achieve biological treatment. Currently commonly used treatment methods include physical and chemical treatment (such as air stripping and breakpoint chlorine addition, etc.) a...

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Problems solved by technology

[0003] The traditional biological treatment technology mainly has the following problems: long process flow, large floor area and high infrastructure investment costs; low temperature in winter, low microbial activity, easy to cause unstable treatment effect; long HRT of the system, requiring a large exposure The gas pool increases investment and operating costs; in order to maintain a high biological concentration and obtain a good denitrification effect, the system must simultaneously return sludge and nitrifying liquid, which increases power consumption and operating costs; the system has weak impact resistance , high-concentration ammonia nitrogen wastewater will inhibit the growth of nitrifying bacteria, the treatment cost is high, and it may cause secondary pollution

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