The Study On Each Unit Water Quality Of Two Kinds Water Process For Municipal Waterworks

Based on the analysis on effluent quality of each stage of biological activated carbon process and membrane process, the turbidity removal rate of two kinds of water treatment technology can reach 99% or more, the UV254 total removal rate is 29 and 26% respectively, the total organic carbon removal rate is 49% and 42% respectively, the permanganate index total removal rate is 28% and26%. The effect of ammonia nitrogen and total nitrogen removal is poor.Peak area varied with molecular weight ranges. The results were divided into three ranges:> 10KDa, 1KDa-10 KDa and< lKDa. By comparison of the distribution characteristics of organic matter molecular weight and types of organic matter change in each section of two kinds of process, organic matters falling within the range 1KDa-lOKDa can be effectively removed with both process. The removal rate are 26% and 34% respectively. Besides, the effect of membrane process on< 1KDa molecular weight organic matter control is better.Raw water of two kinds of process contains a certain amount of chlorinated organic compounds, different kinds of aromatic hydrocarbon and hydrocarbon. Sand leach in biological activated carbon process, coagulation sedimentation and membrane 1, membrane2, membrane3, membrane 4 stage of membrane process could effectively control organic matter types. Organic matter types in effluent after disinfection had a certain increase.Chlorinated disinfection by-products concentration is low in all the stages of the two kinds of process except disinfection effluent. Haloacetic acids and trichloromethane concentration in raw water were 8.5ug/L and 1.5ug/L, the effluent chlorinated disinfection by-products concentration increased after disinfection. After disinfection, haloacetic acids and trichloromethane concentrations were 15.5ug/L and 2.9ug/L in biological activated carbon process effluent,10.4ug/L and 2.8ug/L in membrane process. Chlorine disinfection had an important influence on the formation of chlorination disinfection by-products. In addition, the control of membrane process on haloacetic acids and trichloromethane was better than the BAC process.Raw water formation potential in biological activated carbon process and membrane process was the highest:haloacetic acids formation potential was 194.8ug/ L and 193.lug/L, and trichloromethane formation potential was 105.2ug/L and 107.3ug/L. The formation potential of other processes effluent changed little. Metabolism and growth in biological activated carbon stage had certain influence on formation potential.