Sewage treatment method for inhibiting nitrifying bacteria and enhancing nitrogen and phosphorus removal efficiency

Abstract

The invention discloses a sewage treatment method for inhibiting nitrifying bacteria and enhancing nitrogen and phosphorus removal efficiency, and belongs to the technical field of environmental engineering. For an SBR (sequencing batch reactor) running in an anaerobic / micro-aerobic / anoxic mode, hydroxylamine hydrochloride is added in the initial aeration period of a plurality of running periods in each day for a plurality of days continuously, so that whole-course nitrification is promoted to be converted into short-cut nitrification. The method can effectively improve the removal rate of total nitrogen and total phosphorus in the effluent. Hydroxylamine hydrochloride is added, so that whole-course nitrification can be promoted to be converted into short-cut nitrification, the phosphorusaccumulation effect of PAO (phosphorus accumulation bacteria) can be improved, meanwhile, the activity of AOB (ammonia oxidizing bacteria) can be promoted, the ammonia oxidation completion time can beshortened, the anoxic period time can be prolonged under the condition that the operation period is not changed, and the total nitrogen removal rate can be increased; moroever, the input quantity ofa carbon source also can be reduced. Compared with the conventional denitrification nitrogen and phosphorus removal method by adding the carbon source, the denitrification nitrogen and phosphorus removal method has economic advantages and has the advantage of reducing the sludge yield.

Description

technical field

[0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a sewage treatment method for inhibiting nitrifying bacteria and strengthening the efficiency of nitrogen and phosphorus removal. Background technique

[0002] Nitrogen and phosphorus are the main pollutants in sewage. Removing nitrogen and phosphorus pollutants in sewage by biological method is the most economical method at present. However, its removal rate is restricted by the carbon-nitrogen ratio in sewage. If you want to use biological methods to remove nitrogen and phosphorus pollutants in one step to meet the first-level A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants", the carbon-nitrogen ratio in the influent is required to be greater than 10. However, the carbon and nitrogen in my country's domestic sewage is relatively low (about 7). To achieve the desired removal effect, it is necessary to add biodegr...

Images