Advanced nitrogen and phosphorus removal device and process control method thereof

Abstract

The invention relates to an advanced nitrogen and phosphorus removal device and a process control method thereof, belonging to the technical field of biological sewage treatment by using a biochemical method. Aiming at the defects that the existing A / O step feed technology can not synchronously have advanced biological phosphorus removal, reverse A<2> / O technology is high in energy consumption and complicated in operation and the like, the invention combines the reverse A<2> / O technology and the step feed technology, nitrification liquid internal reflux does not needed to be set, a first section is provided with an anaerobic reactor, anoxic reactors at a second section and a third section are respectively installed on an ORP on-line sensor and a nitrate on-line sensor, and data obtained by collecting ORP and nitrate in an on-line way can be taken as input of a process controller, is output by fuzzification treatment and can act on opening and closing a frequency converter of an actuating mechanism and an external carbon source dosing metering pump so as to save the external carbon dosage. The invention can greatly improve the denitrification effect of the step feed technology, utilizes carbon source of raw water to the utmost extent, realizes synchronous nitrogen and phosphorus removal, and has the advantages of simple control structure and stable quality of yielding water.

Description

technical field [0001] The invention relates to a deep denitrification and dephosphorization device and a process control method, especially an improved inverted A 2 The / O segmented influent deep nitrogen and phosphorus removal device and process optimization control technology belong to the field of biochemical sewage biological treatment and automatic control theory technology, and are suitable for deep nitrogen and phosphorus removal of domestic sewage and industrial wastewater in large, medium and small cities. Background technique [0002] In the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) promulgated in 2002, my country requires that the effluent quality of all sewage units should be less than 5m / L for ammonia nitrogen, less than 15m / L for total nitrogen, and less than 0.5m / L for total phosphorus ( Level A standard), it can be seen that the removal of nitrogen and phosphorus pollutants has become the main problem of sewage treatment...

AI Technical Summary

Problems solved by technology

However, with the rapid development of water treatment technology and increasingly stringent discharge standards, the actual operation process has gradually exposed the inverted A 2 Disadvantages of the / O process: ①Since the process involves two return pipelines, the energy consumption is large and the pipeline layout is complicated

②Unable to make full use of raw water carbon source

There have been a lot of reports on the process control and operation optimization of sewage treatment plants in foreign countries, but there are few domestic studies on the process control of activated sludge process, which are generally limited to the simulation of mathematical models, and the simulation process is only for specific water quality and process. optimization, and even less process control research on continuous flow processes

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