4-硝基酚的污泥减量化作用及对污泥性质的影响

为了有效减少活性污泥法中剩余污泥的产生,采用解偶联剂4-硝基酚对活性污泥工艺中的剩余污泥进行减量化研究。研究了4-硝基酚对污泥的增长速率、基质去除率以及污泥性质的影响。结果表明:4-硝基酚对污泥的减量化作用明显,在对微生物解偶联的过程中并不影响微生物对基质的利用能力;对出水中的氨氮影响甚小,总氮、总磷浓度有轻微的升高。4-硝基酚能够刺激污泥中微生物的活性,比耗氧速率增加,促进能量解偶联,从而降低污泥产率。4-硝基酚使污泥中微生物的群落结构发生了轻微的变化,但对污泥的松散程度和絮凝沉降性能影响甚小。

Impact of 4-nitrophenol on minimization of excess sludge production and performance of sludge in activated sludge process

Reduction of excess sludge production in activated sludge process was investigated by utilizing uncouplers,4-nitrophenol.The effects of 4-nitrophenol on the growth rate of the sludge,substrate removal and sludge properties were further examined.The experimental data show that the sludge production could be reduced effectively by 4-nitrophenol,but only slight reduction in COD removal was obtained.After addition of 4-nitrophenol,the effluent TN and TP concentrations increased slightly,but the effluent NH₄⁺-N concentration almost maintained a constant value.4-nitrophenol improved bioactivity of biomass and increased the oxygen consumption rate of biomass resulting in promoting energy decouple league,which can reduce the production rate of sludge.Compared with the control bioreactor,addition of 4-nitrophenol caused a little variation of microorganism community structure and SVI value of the sludge,but barely affected the settleability of sludge.