In-situ nitrogen removal and standard-improving transformation system for sewage treatment plants and sewage treatment method

Abstract

The invention discloses an in-situ nitrogen removal and standard-improving transformation system for sewage treatment plants. The system comprises an original sewage treatment DAT-IAT biochemical pondbody, a front segment in a DTA pond of the DAT-IAT biochemical pond body is arranged as an anoxic zone, and a rear segment in the DTA pond of the DAT-IAT biochemical pond body is arranged as an aerobic zone; a first aeration pipe is arranged at the bottom of the anoxic zone, submersible mixers are arranged in the anoxic zone in the diagonal direction, and a second aeration pipe is arranged at thebottom of the aerobic zone; the aerobic zone is also provided with fillers; a third aeration pipe is arranged at the bottom of an IAT pond; a mixed liquid reflux pump is arranged at the bottom of theIAT pond, a tee pipe is arranged on a liquid outlet pipe of the mixed liquid reflux pump, and three liquid outlet pipe bodies of the tee pipe are connected to a reflux main pipe, a remaining sludge discharge pipe and a reflux bypass pipe respectively. The invention also provides a method for treating sewage by using the system. The construction difficulty is low, the period is short, the effect acts fast, and ammonia nitrogen, total nitrogen, COD and BOD in effluent water after transformation can all reach first-level A standards of pollutant discharge standards of urban sewage treatment plants.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an in-situ denitrification and upgrading transformation system of a sewage treatment plant and a sewage treatment method. Background technique [0002] Since the promulgation and implementation of "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) in 2002, the number of urban sewage plants in my country has continued to increase, but the requirements for discharge standards at that time were relatively low. Tier 1 or Tier 1 B emission standards. [0003] In the face of my country's still severe water environment situation, improving water pollution and improving the quality of living life has become an important task for building a beautiful China and promoting green development. Relevant governance policies have been implemented successively to ensure the advancement of pollution prevention and control work. The "Water Pollution...

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Problems solved by technology

[0008] The present invention provides an in-situ denitrification and upgrading system and sewage treatment method for sewage treatment plants, which solves the common problem of excessive nitrogen in sewage plants in the prior art, but the urban sewage treatment plants that have been built basically have no place in the DAT- An anoxic pool is newly built at the front of the IAT pool, and in the anoxic section after the aeration of the IAT pool, an external carbon source is used for denitrification, which has the problem of large dosage, high cost, and easy to cause the COD of the effluent to exceed the standard.

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