Removal of natural organic matter and ammonia from dam water by enhanced coagulation combined with adsorption on powdered composite nano-adsorbent

Wongcharee, Surachai and Aravinthan, Vasantha ORCID: https://orcid.org/0000-0002-0918-4833 and Erdei, Laszlo (2020) Removal of natural organic matter and ammonia from dam water by enhanced coagulation combined with adsorption on powdered composite nano-adsorbent. Environmental Technology and Innovation, 17:100557. pp. 1-14.

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Abstract

Enhanced coagulation and adsorption were investigated in separate and combined processes to alleviate problems created by high levels of NOM (15 mg L-1) and ammonia (2.5 mg L-1 NH4-N) in dam water. Raw water acidification to pH 6.2 with optimised enhanced coagulation in jar tests achieved effective (68%) DOC reduction and satisfactory residual turbidity, aluminium, and colour, however removed only 5% ammonia. Adsorption on the nano-adsorbent (termed ACZ) led to 45% DOC reduction and excellent 58% ammonia removal in 30 minutes. Concurrent enhanced coagulation and complementary adsorption using only 80 mg L-1 alum and 150 mg L-1 ACZ doses showed high performance with 76% ammonia, 90% DOC, and 95% trihalomethanes formation potential (THMFP) reduction in 20 minutes time. Concurrent treatment can be simply implemented utilising readily available rapid mixers and flocculators, and operated on demand. Pre-adsorption and consecutive enhanced coagulation using the same alum and ACZ doses resulted in slightly better DOC but reduced (61%) ammonia removal. The results showed that concurrent treatment could safely resolve a challenging operational problem. ACZ combines the distinct advantages of zeolite and activated carbon in a single product, and may find additional uses in removing taste and odour, heavy metals, and synthetic organic matter from ground and surface waters.

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Item Type:	Article (Commonwealth Reporting Category C)
Refereed:	Yes
Item Status:	Live Archive
Faculty/School / Institute/Centre:	Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Faculty/School / Institute/Centre:	Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Date Deposited:	28 Jan 2020 23:41
Last Modified:	19 Jul 2022 00:40
Uncontrolled Keywords:	Drinking water treatment; Disinfection by-products; Breakpoint chlorination; Nano-adsorbent
Fields of Research (2008):	05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management 09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Fields of Research (2020):	41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management 40 ENGINEERING > 4011 Environmental engineering > 401102 Environmentally sustainable engineering
Identification Number or DOI:	https://doi.org/10.1016/j.eti.2019.100557
URI:	http://eprints.usq.edu.au/id/eprint/37459

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