Recycling treatment method of high-ammonia-nitrogen wastewater

Abstract

The invention discloses a recycling treatment method of high-ammonia-nitrogen wastewater. The method comprises the steps of adjusting delivery volume of three streams of wastewater flowing to a prepositioned denitrification tank so as to control the mass ratio of C / N in the prepositioned denitrification tank to be greater than 4, meanwhile, control the DO of the prepositioned denitrification tankto be smaller than 0.5mg / L, and control the DO of an aerobic pool to be smaller than 1.5mg / L, the MLSS of the aerobic pool to be 4,000mg / L to 6,000mg / L and the C / N mass ratio of the postpositioned denitrification tank to be greater than 2.5, completing biochemical treatment on the high-ammonia-nitrogen wastewater with a TN value greater than 500g / L and a NH3-N value greater than 400mg / L, then, carrying out deep treatment of high-density precipitation and ozone catalyzed oxidation, and finally, carrying out recycling treatment of ultrafiltration and reverse osmosis, thereby obtaining deionizedwater capable of being recycled to production. According to the recycling treatment method of the high-ammonia-nitrogen wastewater, the treatment performance is stable and efficient, the operating isenvironmentally friendly and is low in cost and free of secondary pollution, the high-ammonia-nitrogen wastewater can be directly recycled to production, and thus, water resources are saved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a recycling treatment method for high ammonia nitrogen wastewater. Background technique [0002] In wastewater treatment, the removal of ammonia nitrogen mainly utilizes nitrification and denitrification. Nitrification is the process in which ammonia nitrogen is converted into nitrite and nitrate by the action of nitrosifying bacteria and nitrifying bacteria under aerobic conditions; denitrification The effect is also called denitrification, which is the process in which denitrifying bacteria use carbon sources to reduce nitrite and nitrate under anoxic conditions and release nitrogen; while the total nitrogen in wastewater is mainly composed of nitrate nitrogen, nitrite nitrogen, It is composed of inorganic nitrogen such as ammonia nitrogen, and organic nitrogen such as protein, amino acid and organic amine; the organic nitrogen in the total nitrogen is first co...

AI Technical Summary

Problems solved by technology

[0003] The current ammonia nitrogen removal process is only good for the treatment of ammonia nitrogen and total nitrogen in domestic sewage, but it is not ideal for the treatment of high ammonia nitrogen in industrial wastewater. High ammonia nitrogen wastewater generally comes from pharmaceutical and chemical industries, oil refining, chemical fertilizers, meat processing, and feed production. , animal husbandry and waste landfill and other production processes, in which COD concentration>5000mg / L, NH 4 + -N concentration>400mg / L, TN concentration>500mg / L, far higher than the COD 150~300mg / L of domestic sewage, NH 4 + -N 35~65mg / L, TN 35~80mg / L concentration range, if the high ammonia nitrogen wastewater directly enters the biochemical system, it will have a huge impact on the system, and have serious inhibitory and toxic effects on microorganisms

At present, after high ammonia nitrogen wastewater is treated, the total nitrogen value of the effluent often does not meet the treatment standards for recycling production, and the operating costs are high, resulting in heavy environmental protection pressure and heavy burden for enterprises.

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