Biological phosphorus removal device and method by coupling short-cut denitrification and anaerobic ammonia oxidation denitrification

Abstract

The invention relates to a biological phosphorus removal device and method by coupling short-cut denitrification and anaerobic ammonia oxidation denitrification and belongs to the field of sewage treatment. The device is composed of an anaerobic zone, an anoxic zone I, an aerobic zone I, an anoxic zone II, an anoxic zone III, an aerobic zone II and a settling pond. Water inflow is controlled by a PLC system, and 60% of raw water enters the anaerobic zone to realize anaerobic phosphor release; then a mixed liquid is denitrified in the anoxic zone I, and absorbs phosphor and is nitrified in the aerobic zone I; the mixed liquid and 40% of the raw water enter the anoxic zone II at the same time to realize the short-cut denitrification; then the mixed liquid enters the anoxic zone III operating in an IFAS manner to realize anaerobic ammonia oxidation reaction, and the mixed liquid in the anoxic zone III further absorbs phosphor and is nitrified in the aerobic zone; and finally, the mixed liquid enters the settling pond to separate sludge and water, the supernate is directly discharged out of the system, and concentrated sludge flows back to the anoxic zone I through a reflux pump and then flows back to the anaerobic zone from the anoxic zone I through a mixed liquid reflux pump. Residual sludge of the system is discharged out of the system periodically, so that simultaneous phosphor and nitrogen removal is realized.

Description

technical field [0001] The invention relates to a short-range denitrification-anammox denitrification coupled biological phosphorus removal continuous flow device, which belongs to the field of urban sewage treatment and resource utilization. Background technique [0002] Nitrogen and phosphorus are the main factors that cause eutrophication of lakes and oceans. TN>0.1mg / L and TP>0.02mg / L in water will lead to eutrophication of water. Therefore, my country's current sewage treatment begins to pay attention to the removal of nitrogen and phosphorus. The concentration of ammonia nitrogen in urban domestic sewage is 50-70mg / L, and the concentration of phosphorus is 6-7mg / L. Due to the different sludge ages of nitrifying bacteria and aerobic phosphorus accumulating bacteria, and limited biodegradable organic carbon sources in sewage, the removal of nitrogen and phosphorus cannot be taken into account. Sewage treatment plants usually operate in the way of biological denitr...

AI Technical Summary

Problems solved by technology

First of all, both the denitrification process and the anaerobic phosphorus release process of phosphorus accumulating bacteria require the participation of raw water carbon sources, and the lack of raw water carbon sources will make it difficult to achieve simultaneous nitrogen and phosphorus removal

Secondly, the nitrate carried in the sludge return will also affect the anaerobic environment required for the destruction of phosphorus release, reducing the phosphorus removal effect

Finally, nitrifying bacteria are autotrophic bacteria, and their growth requires a longer sludge age. In order to enhance the phosphorus removal effect, a shorter sludge age needs to be maintained to ensure timely discharge of excess sludge. There is a contradiction between the two

Images