Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/139904
Title: Comparative study of dissolved organic matter generated from activated sludge during exposure to hypochlorite, hydrogen peroxide, acid and alkaline : implications for on-line chemical cleaning of MBR
Authors: Cai, Weiwei
Liu, Yu
Keywords: Engineering::Civil engineering
Issue Date: 2018
Source: Cai, W., & Liu, Y. (2018). Comparative study of dissolved organic matter generated from activated sludge during exposure to hypochlorite, hydrogen peroxide, acid and alkaline : implications for on-line chemical cleaning of MBR. Chemosphere, 193, 295-303. doi:10.1016/j.chemosphere.2017.11.032
Journal: Chemosphere
Abstract: Although on-line chemical cleaning has been extensively employed for maintaining the MBR permeability, little attention has been given to the negative impacts of such prevalent membrane cleaning practice. This study thus comparatively investigated the potential release of dissolved organic matter (DOM) from activated sludge upon the exposure to different kinds of frequently-used cleaning reagents, i.e. NaClO, H2O2, HCl and NaOH. It was found that NaClO at 50 and 80 mg L-1 triggered significant release of DOM, while NaOH strongly promoted soluble nitrogen release. However, the DOM generation induced by H2O2 in the range of 0-80 mg L-1 was nearly negligible. The combined analysis by EEM-PARAFAC and LC-OCD-OND further revealed that NaClO-triggered DOM mainly originated from the breakdown of humic substances and other small humics with molecular weight (MW) less than 500 Da. In contrast, proteins and other biopolymers with higher MW highly contributed to DOM induced by NaOH. Most of DOM detected in this study belonged to low molecular weight (LMW) substances, which were not considered readily biodegradable or physically retainable by microfiltration membrane. It appears from this study that DOM generated from suspended activated sludge during membrane cleaning with different chemicals should be taken into serious consideration when water recycle and reuse are concerned.
URI: https://hdl.handle.net/10356/139904
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2017.11.032
Rights: © 2017 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:NEWRI Journal Articles

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