Nitrogen and phosphorus removal method coupling A/O step-feed MBBR (moving bed biofilm reactor) process with cloth filter

Abstract

The invention relates to a nitrogen and phosphorus removal method coupling an A / O step-feed MBBR (moving bed biofilm reactor) process with a cloth filter. Suspended filler is added into a reaction tank of the A / O step-feed stage, and the pollutants are effectively removed by a biofilm formed on the suspended filler. Meanwhile, by adopting a chemical phosphorus removal process and coupling with the cloth filter, the sewage after nitrogen and phosphorus removal is further treated to realize deep nitrogen and phosphorus removal and further purify the water quality. The method provided by the invention has the advantages that the utilization rate of the carbon source is effectively increased, the energy consumption is reduced, phosphorus can be removed more stably and the impact resistance is improved. Meanwhile, by adopting the cloth filter process, the effluent quality is better.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a sewage treatment method for an A / O segmented water inflow coupling filter cloth filter, specifically an A / O segmental water inflow MBBR process coupled filter cloth filter for deep denitrification Phosphorus method. Background technique [0002] In recent years, the scale of sewage treatment in my country has been expanding, and the concentration of pollutants in surface water, especially organic matter (COD) and ammonia nitrogen, has been effectively controlled. However, for closed water bodies such as lakes and reservoirs, the eutrophication problem caused by the excessive concentration of nutrients such as nitrogen and phosphorus has not been effectively alleviated, and it is becoming more and more serious. Realizing the deep denitrification and phosphorus removal of sewage is the solution to this problem Effective Ways. On the other hand, due to factors such as changes ...

AI Technical Summary

Problems solved by technology

But at present, it also has certain deficiencies: (1) The activated sludge in the aerobic zone is prone to sludge bulking under operating conditions such as low dissolved oxygen (DO), which can cause an increase in the concentration of suspended solids (SS) in the effluent and deteriorate the quality of the effluent; (2) The continuous flow A / O staged water inflow process adopts the alternating anoxic / aerobic plug-flow operation mode. The aerobic effluent in the previous stage will carry a large amount of DO into the anoxic zone in the latter stage, destroying the anoxic environment required for denitrification; (3) in In the case of large fluctuations in the quality and quantity of influent water and abnormal operation (shutdown) of the system, the anti-shock load capacity of the activated sludge system is weak; ⑷The excess sludge output is often large, which increases the subsequent sludge disposal cost

(5) Cannot remove phosphorus

For example, the Chinese patent "Improved device and method for denitrification and dephosphorization of staged influent depth" (notification number: CN101570382 B, announcement date: 2011.7.13) announced an improved device and method for denitrification and dephosphorization of staged influent depth. A The / O staged water intake process is changed to the improved UCT staged water intake process, and denitrification and phosphorus removal bacteria are domesticated to achieve denitrification and phosphorus removal, thereby achieving phosphorus removal, but the above problems (2) (3) (4) still exist in this method

In addition, the domestication cycle of denitrifying phosphorus removal bacteria is relatively long, so the start-up time is correspondingly relatively long; there is a contradiction in sludge age between phosphorus removal and nitrogen removal, and the two cannot be taken into account at the same time, so the stability of phosphorus removal is poor

The Chinese patent "A device for denitrification and phosphorus removal of MBBR with water inflow" (notification number: CN202492436 U, announcement date: 2012.10.17) discloses a device for denitrification and phosphorus removal of MBBR with water inflow for stages, and the A / O water inflow process is divided into stages It is changed to improve the UCT segmental water inlet process, and domesticate denitrification and phosphorus removal bacteria to achieve denitrification and phosphorus removal, thereby achieving phosphorus removal. By adding suspended fillers in the aerobic section and using filter cloth filters, phosphorus and nitrogen removal have been solved. There is a contradiction in the age of the sludge, and the use of denitrification phosphorus removal bacteria to achieve phosphorus removal, but there are still problems such as a relatively long acclimatization period for denitrification phosphorus removal bacteria, and a relatively long start-up time

[0005] Chinese patent "A 2 O Suspended packing process coupling filter cloth filtration integrated nitrogen and phosphorus removal device and method" (notification number: CN103435220A, publication date: 2013.12.11), passed to A 2 Adding suspended filler and using filter cloth filter in the O process solves the contradiction of sludge age in phosphorus removal and nitrogen removal, but compared with the segmented water inflow process, the utilization rate of carbon source is low, the reflux of nitrifying liquid is required, and the energy consumption is large And other issues

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