Removal effect of trihalomethanes (THMs) and halogenated acetic acids (HAAs) precursors in reclaimed water by polyaluminum chloride (PACl) coagulation

Author:

Wang Juncheng1,Yue Wen1,Wang Zhenghao2,Bai Yu3,Song Jina1

Affiliation:

1. a College of Energy and Environmental Engineering, Hebei University of Engineering, No. 19 Taiji Road, Handan City, Hebei Province 056038, China

2. b College of Environment, Hohai University, Nanjing City, Jiangsu Province 210024, China

3. c Handan Municipal Engineering Company, Handan City, Hebei Province 056001, China

Abstract

Abstract This study analyzed the removal effect of various doses of polyaluminum chloride (PACI) on wastewater treatment plants at pH 7. The sewage plant's secondary effluent organic matter (EfOM) separates into four components: hydrophobic base (HOB), hydrophilic (HI), hydrophobic acid (HOA), and hydrophobic neutral (HON). The removal effect for various forms of organic waste is optimum at 16 mg/L and that halogenated acetic acids (HAAs) and trihalomethanes (THMs) are formed simultaneously. After PACI treatment, hydrophobic organic compounds were converted to humic acid (HA), fulvic acid (FA), soluble microbial products (SMPs), and other HI organic compounds, increasing the amount of HAAs produced by HI fractions. Removal rate of hydrophobic organic compounds, particularly HON, is 92.8% when using PAC. Moreover, after EfOM coagulation, most HAAs are trichloroacetic acid (TCAA), followed by bromochloroacetic acid (BCAA) and bromodichloroacetic acid (BDCAA). Only HOB can produce monochloroacetic acid (MCAA), whereas HA and SMPs with HOA are primary components of dichloroacetic acid (DCAA). The toughest removable byproduct of THMs is CHBr3, and after condensation of each THM component, only HOA and HON produce CHBr3, while HI produces only a minimal quantity of CHBrCl2 and CHCl3.This finding is critical for understanding how disinfection byproducts are produced after chlorinating EfOM.

Funder

National Outstanding Youth Science Fund Project of National Natural Science Foundation of China

Natural Science Foundation of Hebei Province

Science and Technology Postgraduate Education and Research Development Office, Office of the Higher Education Commission

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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