pH modeling for maximum dissolved organic matter removal by enhanced coagulation.
Correlations between raw water characteristics and pH after enhanced coagulation to maximize dissolved organic matter (DOM) removal using four typical coagulants (FeCl3, Al2(SO4)3, polyaluminum chloride (PACl) and high performance polyaluminum chloride (HPAC)) without pH control were investigated. These correlations were analyzed on the basis of the raw water quality and the chemical and physical fractionations of DOM of thirteen Chinese source waters over three seasons. It was found that the final pH after enhanced coagulation for each of the four coagulants was influenced by the content of removable DOM (i.e. hydrophobic and higher apparent molecular weight (AMW) DOM), the alkalinity and the initial pH of raw water. A set of feed-forward semi-empirical models relating the final pH after enhanced coagulation for each of the four coagulants with the raw water characteristics were developed and optimized based on correlation analysis. The established models were preliminarily validated for prediction purposes, and it was found that the deviation between the predicted data and actual data was low. This result demonstrated the potential for the application of these models in practical operation of drinking water treatment plants.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. jkxie_st@rcees.ac.cn
Jiankun
J
Xie
Dongsheng
D
Wang
John
J
van Leeuwen
Yanmei
Y
Zhao
Linan
L
Xing
Christopher W K
CW
Chow
D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D009930:Organic Chemicals / Q000302:isolation & purification*; D018508:Water Purification; D060753:Water Quality
D009930:Organic Chemicals