Removal natural organic matter by coagulation-adsorption and evaluating the serial effect through a chlorine decay model.
The removal of natural organic matter (NOM) by coagulation and adsorption on modified wheat straw (MWS) was investigated. Two types of inorganic polymer coagulants, polyferric chloride (PFC) and polyaluminum chloride (PAC), were used during experiments. The removal efficiency of NOM in terms of UV(254), DOC and COD(Mn) increased with the dosage of coagulants and adsorbent increasing. Combined coagulation and adsorption showed better UV(254) and turbidity removal efficiency (61.8% and 95.8% respectively for PFC-MWS, and 61.5% and 94.2% respectively for PAC-MWS) than individual treatment. The effects of combination sequences on DOC fractionation and residual chlorine decay were analyzed and the chlorine data were fitted using a chlorine decay model. In general, the higher the molecular weight of NOM was, the better removal efficiency the combined treatment can achieve. MWS can enhance the removal of NOM with higher molecular weight. The disinfection by-products (DBPs) formation potential in the effluents from coagulation and subsequent adsorption was greater than that in the effluents from adsorption and subsequent coagulation.
Zhan
Xiao
X
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China. zhxiao2007@126.com
Gao
Baoyu
B
Yue
Qinyan
Q
Liu
Bin
B
Xu
Xing
X
Li
Qian
Q
D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry; D002713:Chlorine / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D008970:Molecular Weight; D009930:Organic Chemicals / Q000302:isolation & purification*; D014908:Triticum
D005290:Ferric Compounds; D009930:Organic Chemicals; C541115:polyferric chloride; C016213:aluminum oxychloride; D002713:Chlorine; D000536:Aluminum Hydroxide