Relationship between typical organic matters in domestic wastewater and water characteristic parameters in activated sludge models

The contribution of typical organic matters such as proteins,sugars,lipids and linear alkylbenzene sulfonate(LAS) to COD of the domestic wastewater was investigated.Nitrate utilization rate was used to determine wastewater characteristic parameters.Relationship between these typical organic matters and wastewater characteristic parameters(S_S,X_S,S_I,X_I) in activated sludge models were investigated.The results showed that YH of activated sludge under denitrifying conditions was 0.683.Proteins,sugars,lipids and LAS accounted for 24%-35%,17%-35%,5.78%-10.56% and 3.77%-7.23% of the total COD,respectively.It indicated that these four pollutants were the main COD source in the domestic wastewater.SS and XI were in the ranges of 22%-29% and 29%-38% of the total COD,respectively.Concentrations of the four typical target organic matters(proteins,sugars,lipids and LAS) correlated well with the wastewater characteristic parameters(S_S,X_S,S_I,X_I) of activated sludge models(ASMs) with the correlative coefficients above 0.9.