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1.The importance of DO for MBBR process
Theoretically speaking, when the DO mass concentration is too high, DO can penetrate into the biofilm, making it difficult to form anoxic zone inside, and a large amount of ammonia nitrogen is oxidized into nitrate and nitrite, making the TN of the effluent still high ; MBBR The nitrification effect of the process decreases, which increases the ammonia nitrogen concentration in the effluent, which causes the TN of the effluent to rise, which affects the final treatment effect
2.An optimal value of DO for MBBR treatment of municipal sewage
1）When the mass concentration of DO is above 2mg/L, DO has little effect on the nitrification effect of MBBR, the removal rate of ammonia nitrogen can reach 97%-99%, and the ammonia nitrogen in the effluent can be kept below 1.0mg/L
2）When the DO mass concentration is about 1.0mg/L, the removal rate of ammonia nitrogen is about 84%, and the ammonia nitrogen concentration in the effluent increases significantly
