Comparison of Advantages and Disadvantages of Common Biological Nitrogen and Phosphorus Removal Processes

1, A _N /O

Advantages: 1 remove BOD before oxygen consumption, save energy; 2 produce alkalinity before nitrification; 3 pre-oxygen has the role of selection pool

Disadvantages: 1 The effect of nitrogen removal is affected by the ratio of internal circulation;   2 There may be problems with Nocardia;   3 need to control the DO of the circulating mixture

2, A _P /O

Advantages: 1 The process is simple; 2 The hydraulic retention time is short; 3 The sludge sedimentation performance is good; 4 The phosphorus-rich bacteria are rich in carbon source, and the phosphorus removal effect is good.

Disadvantages: 1 If there is nitrification, the effect of dephosphorization will decrease; 2 the process flexibility is poor

3, A ² /O

Advantages: 1 simultaneous nitrogen and phosphorus removal; 2 denitrification process provides alkalinity for nitrification; 3 denitrification process simultaneously removes organic matter; 4 sludge sedimentation performance is good

Disadvantages: 1 The return sludge contains nitrate into the anaerobic zone, which has an effect on the phosphorus removal effect; 2 The nitrogen removal is affected by the internal reflux ratio; 3 The polyphosphate and denitrifying bacteria need to easily degrade the organic matter.

4. Invert A ² /O

Advantages: 1 simultaneous nitrogen and phosphorus removal; 2 anaerobic zone release of phosphorus without nitrate; 3 no mixed liquid reflux, simple process, energy saving; 4 denitrification process simultaneously remove organic matter; 5 aerobic phosphorus uptake; 6 sludge Good settlement performance

Disadvantages: 1 anaerobic phosphorus release can not get high quality degradation carbon source; 2 total nitrogen removal effect is not high when no mixed liquid reflux

5, UCT

Advantages: 1 Reduce the amount of nitrate entering the anaerobic zone and improve the efficiency of phosphorus removal; 2 The efficiency of phosphorus removal is improved for sewage with low organic matter concentration; 3 The effect of nitrogen removal is good

Disadvantages: 1 operation is more complicated;   2 need to add additional reflux system

6, improved Bardenpho

Advantages: 1 excellent nitrogen removal effect;   2 sludge sedimentation performance is good

Disadvantages: 1 pool body is more separated;   2 pool volume is larger

7, PhoStrip

Advantages: 1 Easy to integrate and modify with existing facilities;   2 process flexibility is good; 3 phosphorus removal performance is not limited by the concentration of influent organic matter; 4 dosage is much smaller than chemical precipitation; 5 effluent phosphate concentration can be stable less than 1mg / L

Disadvantages: 1 need to add chemicals; 2 mixture should maintain a higher DO concentration to prevent phosphorus release in the secondary settling tank; 3 additional pool body for phosphorus desorption; 4 if using lime may have scaling problems

8, SBR and deformation process

Advantages: 1 can simultaneously remove nitrogen and phosphorus; 2 static precipitation can obtain low SS water; 3 withstand hydraulic shock load; 4 good operational flexibility

Disadvantages: 1 Simultaneous nitrogen and phosphorus removal operation is complicated; 2 The reliability of the water-repellent facilities has great influence on the effluent water quality; 3 The design process is complicated; 4 The maintenance requirements are high, the operation is highly dependent on the automatic control;

For more information, please pay attention: Yingnuo Instrument (Shanghai) Co., Ltd.

Website: http://

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