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.
journal_name
Chemospherejournal_title
Chemosphereauthors
Cai W,Liu Ydoi
10.1016/j.chemosphere.2017.11.032subject
Has Abstractpub_date
2018-02-01 00:00:00pages
295-303eissn
0045-6535issn
1879-1298pii
S0045-6535(17)31799-Xjournal_volume
193pub_type
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