Characteristics of DOM and Removal of DBPs Precursors across O3-BAC Integrated Treatment for the Micro-Polluted Raw Water of the Huangpu River

Abstract

Abstract:The aim of this study is to determine the impact upon dissolved organic matter (DOM) and removal of disinfection by-product (DBP) precursors of adding an ozone-biological activated carbon (O 3 -BAC) process after the conventional treatment process (CTP) using water from the Huangpu River in Shanghai, east China. Several metrics, including size fractionation, dissolved organic carbon (DOC) and trihalomethane formation potential (THMFP), were employed to accomplish this goal. In the raw water collected from the Huangpu River, the low molecular weight (MW) molecules (MW <3 kDa) were absolutely dominant in DOM, accounting for more than 55% of total DOC, and the DOM resulted in a high THMFP level of 472.91 ± 4.63 µg/L after an excessive chlorination. The CTP reduced high MW molecules (MW >10 kDa) by 61% and the low MW molecules (MW <3 kDa) by only 8%. The O 3 -BAC presented an accumulated DOC removal efficiency of approximately 50%, in particular, showing a high degree of the removal effectiveness of low MW molecules. Samplings from the CTP, ozone and BAC were subjected to excessive chlorination to determine the THMFP, and the measured concentrations were 211.89 ± 4.58 µg/L, 169.52 ± 4.55 µg/L, and 124.42 ± 4.27 µg/L, respectively. Therefore, coupled with the THMFP removal rate of 74%, the addition of the O 3 -BAC process after an existing CTP improved the water quality of the effluent, particularly, in terms of the improved reduction in the precursors of DBPs.

Seasonal variation of assimilable organic carbon and its impact to the biostability of drinking water

“…In this study, however, AOC produced by ozonation is composed of low molecular weight and non-aromatic organic compounds [17,19,43,48,49]. So, physical interaction may be more important than hydrophobic interaction in adsorbing those low molecular weight and hydrophilic AOC compounds by GAC.…”

“…molecular weight and biodegradable organic matters, e.g., aldehydes, ketones, ketoacids and carboxylic acids [14,16,17,19,20,36,43,48,49]. In the YWTP, AOC increase was high from May to November, but low in winter (January to March).…”

Developing Public Policy Options for Access to Drinking Water in Peripheral, Disaster and Polluted Rural Areas: A Case Study on Environment-Friendly and Conventional Technologies

“…This paper addresses a gap in the literature, as there is a paucity of studies on drinking water policy alternatives in Romania, despite the paramount importance of the subject. Although abundant research is dedicated to various aspects of drinking water treatment [8][9][10], including a similar dual perspective (economic-technical and/or conventional-green), the joining of a conventional and an environmentally friendly technology in the framework of a public policy analysis dedicated especially to PDP rural areas in Romania gives originality to the present paper. In general, three types of impact-economic, social and environmental-are analyzed in order to have a sustainable public policy, and here the first one was taken under scrutiny.…”

Comparative Study on Influences of Bank Slope Ecological Revetments on Water Quality Purification Pretreating Low-Polluted Waters

“…Little influence of ambient conditions on COD Mn removal in Ditch A was observed during the same experimental runs. Some references [31,34] have found that small molecules dominated the total dissolved organic matter (DOM) in the Huangpu River, with pesticides, herbicides, and phytohormones detected at high levels, and these small compounds contributed more than 55% of the dissolved organic pollutants in raw water from the Huangpu River. In general, the absorption process and biochemical reactions on ecological revetments were insufficient to remove these small organic compounds [38] and thus led to a lower COD Mn removal rate than that for nutrient pollutants in the same experimental runs.…”

“…Over the years, the Huangpu River provides the major source of water for Shanghai, the largest city in China, however, the water quality of the Huangpu River have showed a decreasing trend of deterioration recently [30,31,34], and concentration values of COD Mn , ammonia, and TP in the Huangpu River frequently exceeded 6.0, 1.0, and 0.2 mg/L, respectively, which were standard limited values of water quality grade III for potable water sources according to China Environmental Quality Standards for Surface Water (GB3838-2002) [35]. Therefore, a pre-treating drinking water had to be exerted on raw water from the Huangpu River aiming to guaranteeing drinking water safety.…”