An anaerobic-ao-sacr combined deep denitrification system and process for high ammonia nitrogen sewage

Abstract

The invention provides an anaerobic-AO-SACR combined high ammonia nitrogen sewage deep denitrification system and process. The high ammonia nitrogen sewage first enters the anaerobic reactor, removes most of the organic matter in the sewage, and enters the AO reactor after the water is discharged. The pre-denitrification denitrification is carried out in the oxygen zone, and the remaining organic matter is removed and the nitrification of ammonia nitrogen is carried out in the aerobic zone. After the water is released, it enters the intermediate pool. At the same time, through the control of water quality testing equipment and PLC controller, some raw water is introduced into the intermediate pool to adjust The carbon-to-nitrogen ratio of the sewage, and then, the effluent enters the SACR reactor, using the characteristics of denitrifying bacteria, and through the regulation of the SACR reactor through the PH / DO / ORP detector and the PLC controller, the sewage is accurately pre-denitrified ‑Nitrification‑Endogenous denitrification, thereby deep denitrification, at the same time, no external carbon source is required, the process cost is low, and, for the sewage treatment facilities that have been built using the AO process, it can be implemented only by adding intermediate water tanks and SACR reactors The process of the technical proposal has low upgrading and transformation costs.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an anaerobic-AO-SACR combined deep denitrification system and process for high ammonia nitrogen sewage. Background technique [0002] At present, with the strengthening of environmental protection awareness, the strengthening of environmental pollution control and the development of environmental protection technology, water pollution has been relatively effectively controlled initially. However, the standard discharge of high-ammonia-nitrogen wastewater common in industrial production is still an urgent problem. The problem. High ammonia nitrogen wastewater mainly comes from chemical fertilizer, petrochemical, aquaculture, garbage treatment and other industries. In terms of high ammonia nitrogen wastewater treatment, it is not only necessary to pursue the technical indicators of efficient denitrification, but also to consider reducing energy consumption, saving energy a...

AI Technical Summary

Problems solved by technology

Although the A / O process has an independent anoxic zone for denitrification, the denitrification rate is faster, but because it belongs to pre-denitrification, the denitrification rate is not high. To improve the denitrification efficiency, the internal circulation must be increased. In addition, the internal circulating liquid comes from the aeration tank and contains a certain amount of DO, which makes it difficult to maintain an ideal anoxic state in the anoxic zone, which affects the denitrification effect, and the denitrification rate is difficult to reach 90%.

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