Anaerobic adsorption dephosphorization and denitrification process

Abstract

The invention discloses anaerobic absorption, dephosphorization and denitrogenation technology, which is mostly suitable for treating urban domestic sewage. The sewage to be treated is divided into two parts; partial sewage is mixed with return sludge, settled and subjected to anaerobic phosphorus release; and the other part of the sewage directly enters into a secondary settling tank and is mixed with the return sludge and settled, and supernatant obtained exceeds an aeration tank and directly enters into a subsequent denitrifying tank in a multipoint mode. Compared with the prior art, the anaerobic absorption, dephosphorization and denitrogenation technology has the advantages that: firstly, the anaerobic absorption, dephosphorization and denitrogenation technology fully utilizes available carbon sources in the wastewater to preferably provide carbon source nutrition for phosphorus-accumulating bacteria, accelerates growth of the phosphorus-accumulating bacteria, promotes the proportion of the phosphorus-accumulating bacteria in activated sludge, and further improves the dephosphorization efficiency; secondly, the anaerobic absorption, dephosphorization and denitrogenation technology greatly improves the anaerobic sludge concentration, the aerobic sludge concentration and the anoxic sludge concentration, obviously improves the overall dephosphorization and denitrogenation efficiency, and simultaneously reduces the capacity of a structure and saves the investment; and thirdly, the anaerobic absorption, dephosphorization and denitrogenation technology obviously saves the aeration cost under the condition of blast aeration.

Description

technical field [0001] The invention relates to sewage biological treatment technology, in particular to an anaerobic adsorption dephosphorization and nitrogen removal process, which is especially suitable for the treatment of urban domestic sewage. Background technique [0002] In recent years, biological phosphorus and nitrogen removal from wastewater has become a research hotspot. Biological phosphorus and nitrogen removal is achieved by phosphorus-accumulating bacteria that have excess phosphorus accumulation for growth. Phosphorous accumulating bacteria are alternately in anaerobic and aerobic conditions and compete with other bacteria for substrates, absorb volatile fatty acids under anaerobic conditions, transport them into cells, and assimilate them into intracellular carbon source storage (PHB). Release the phosphorus of polymerized phosphate (poly-P) in the cell protoplasm to provide energy; under aerobic conditions, phosphorus-accumulating bacteria store phosphor...

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Problems solved by technology

[0003] At present, the wastewater treatment plant adopts a wide range of denitrification and phosphorus removal processes: A 2 / O, SBR, oxidation ditch, etc. These processes are all developed based on the traditional mechanism of nitrification and denitrification, nitrogen and phosphorus removal, but because the nitrifying bacteria in these processes grow slowly, and the nitrification of the traditional activated sludge method The sludge concentration in the process is low, generally only 3-5g / L, so it takes a long time for nitrification. For general domestic sewage, it usually takes more than 5 hours for nitrification, which increases investment and operation. cost

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