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

A sewage treatment method and technology for denitrification and phosphorus removal, which are applied in the field of environmental engineering, can solve the problems of unstable short-range nitrification process and difficult to maintain for a long time, and achieve the effects of improving phosphorus accumulation effect, promoting efficiency and promoting activity.

Pending Publication Date: 2021-01-19
CHANGAN UNIV +1
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Problems solved by technology

Therefore, the short-cut nitrification process is usua

Method used

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

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Embodiment

[0031] In this experiment, a plexiglass cylinder with an effective volume of 8L was used to operate intermittently with water inflow and outflow to form an SBR reactor. The experimental temperature was 28±1°C. The reactor feed water is mainly prepared by glucose and ammonium bicarbonate. The influent COD concentration is 350mg / L, the total nitrogen concentration is 50mg / L, and the total phosphorus concentration is 5mg / L. The drainage ratio is 3 / 8. Run 4 cycles a day, 6 hours per cycle, of which water intake + anaerobic 1 hour, aerobic 1.5-3 hours, anoxic 1-2.5 hours, static settling 0.5 hours, drainage and idle 0.5 hours. The aeration intensity is 0.28L / min, the dissolved oxygen DO is 0.1-0.3mg / L in the aerobic period, and the sludge concentration is 5000mg / L. The running time of the aerobic period is automatically controlled by the DO online monitoring PLC, and the aeration is automatically stopped when the dissolved oxygen is higher than 0.5mg / L.

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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...

Claims

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Application Information

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IPC IPC(8): C02F3/30
CPCC02F3/308C02F3/302
Inventor 赵剑强雷琳赵浚凯雷舒涵解淑婷黄婷白波
Owner CHANGAN UNIV
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