Evaluating the biosafety of conventional and O3-BAC process and its relationship with NOM characteristics. Issue 2 (17th January 2018)

• Record Type: Journal Article
• Authors: Liao, Xiaobin; Zou, Rusen; Chen, Chao; Yuan, Baoling; Zhou, Zhenming; Zhang, Xiaojian
• Is Part Of: Environmental technology. Volume 39:Issue 2(2018)
• Page Start: 221
• Page End: 230
• Publication Date: 2018-01-17
• Subjects: AOC -- BDOC -- biosafety -- O3-BAC -- molecular weight distribution; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2017.1297850
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: It is the priority to guarantee biosafety for drinking water treatment. The objective of this study was to evaluate the impact of widely applied conventional and ozone-biological activated carbon (O3 -BAC) advanced treatment technology on biosafety of drinking water. The items, including assimilable organic carbon (AOC), biodegradable dissolved organic carbon (BDOC), heterotrophic plate counts (HPCs) and the microorganism community structures, were used to evaluate the biosafety. Moreover, their relationships with molecular weights (MWs) and fluorescence intensity of dissolved organic matter were investigated. The results indicated that the technology provided a considerable gain in potable water quality by decreasing dissolved organic carbon (DOC, from 5.05 to 1.71 mg/L), AOC (from 298 to 131 μg/L), BDOC (from 1.39 to 0.24 mg/L) and HPCs (from 275 to 10 CFU/mL). Ozone brought an increase in DOC with low MW <1 kDa, which accompanies with an increase in AOC/BDOC concentration, which could be reduced effectively by subsequent BAC process. The formation of AOC/BDOC was closely related to DOC with low MWs and aromatic protein. Bacteria could be released from BAC filter, resulting in an increase in HPC and the presence of pathogenic bacteria in effluent, while the post sand filter could further guarantee the biosafety of finished water.