Modified four-section water-feeding A/O deep denitrogenation device and process control method

Abstract

An improved four-segment water inlet A / O advanced nitrogen removal device and the process control method belong to the activated sludge sewage treatment field. The existing technology can not achieve advanced nitrogen removal and is high in operating costs and is complicated to be operated. A back hypoxic and deoxy area is arranged on the tail end of an aerobic zone in a fourth segment of the invention, in order to make carbon adding on nitrate nitrogen accumulated in the preceding segments; a nitrate nitrogen inner circulating apparatus is additionally arranged in the aerobic zone of the fourth segment, so that part of nitrate nitrogen will reflow to a hypoxic area of a first segment to make full use of the denitrification capacity of the hypoxic area of the first segment and reduce the load of the nitrate nitrogen in the back hypoxic and deoxy area in order to reduce the carbon adding amount. Moreover, an ammonia-nitrogen online sensor is arranged in the aerobic zone of the fourth segment, while a nitrate-nitrogen and ORP online sensor is arranged in the back hypoxic and deoxy area, and the acquired signals are used to control the aeration amount and the external carbon addition amount of the system. The invention can improve the nitrification and denitrification effect of the four-segment water inlet A / O process, with less carbon addition, low operating costs and simple control structure.

Description

technical field [0001] The invention relates to an improved segmented water inflow A / O biological denitrification treatment process and a process control device for nitrogen-containing wastewater, and belongs to the technical field of the theory, method and technology of automatic control of activated sludge sewage treatment system. It is suitable for deep denitrification of domestic sewage and nitrogen-containing industrial wastewater in large, medium and small cities. Background technique [0002] The problem of eutrophication is one of the most important water pollution problems faced by countries all over the world. Although the treatment rate of urban sewage in my country has been continuously improved in recent years, the problem of eutrophication caused by nitrogen and phosphorus pollution has not been fundamentally solved. There is even a growing trend. my country's large freshwater lakes and coastal waters are moderately or severely polluted with eutrophication. In...

AI Technical Summary

Problems solved by technology

Solve: ① The limitation of the total nitrogen removal rate due to the structural limitation of the segmented water inlet A / O process

②The amount of deep denitrification agent is large, the operating cost is high and it is difficult to meet the treatment requirements ③The control requirements for deep denitrification are high and the control structure is complicated

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