Abstract
The treatment efficiency of domestic sewage by the SBR filled with humus soil was investigated and compared with that by the conventional SBR. The results show that the removal rates of organic matters, NH4+-N and TP by the SBR filled with humus soil reach 85%, 83% and 72% respectively. Compared with the conventional SBR, the degradation rate of organic matters is improved, and the addition of humus soil contributes to occurrence of SND, thus the removal rate of NH4+-N is increased. The addition of humus soil shortens the oxidation time of organic matters and the nitrification time of NH4+-N, which can improve the treatment efficiency and reduce the operation cost.
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