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

Article


Wongcharee, Surachai, Aravinthan, Vasantha 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, pp. 1-14. https://doi.org/10.1016/j.eti.2019.100557
Article Title

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

ERA Journal ID210427
Article CategoryArticle
AuthorsWongcharee, Surachai (Author), Aravinthan, Vasantha (Author) and Erdei, Laszlo (Author)
Journal TitleEnvironmental Technology and Innovation
Journal Citation17, pp. 1-14
Article Number100557
Number of Pages14
Year2020
PublisherElsevier
Place of PublicationNetherlands
ISSN2352-1864
Digital Object Identifier (DOI)https://doi.org/10.1016/j.eti.2019.100557
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S2352186418305431
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.

KeywordsDrinking water treatment; Disinfection by-products; Breakpoint chlorination; Nano-adsorbent
ANZSRC Field of Research 2020410404. Environmental management
401102. Environmentally sustainable engineering
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Byline AffiliationsSchool of Civil Engineering and Surveying
Institution of OriginUniversity of Southern Queensland
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