Natural organic matter (NOM) and turbidity removal by plant-based coagulants: A review

View/ Open
Main article (2.489Mb)
Download
Publication date
2021Keyword
Coagulation-flocculationCoagulant
Drinking water
Organic matter
Compounds extraction and purification
Natural organic matter (NOM)
Rights
© 2021 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.Peer-Reviewed
yesOpen Access status
GreenAccepted for publication
2021-10-12
Metadata
Show full item recordAbstract
NOM deteriorates water quality by forming taste, clarification, colour, and odour problems. It also increases coagulant and chlorine consumption which can initiate disinfection by-products harmful to human health. The coagulation-flocculation (CF) technique is an established method commonly employed to remove NOM in water treatment. Plant-based coagulant products (PCPs) derived from plants like the Moringa oleifera (MO) Strychnos potatorum Linn and Opuntia ficus indica, have been studied and proposed as sustainable alternatives to chemical coagulant, like, aluminium sulphate due to their abundant availability, low cost, low sludge volume and disposal cost, and biodegradability. This review paper provides an overview of the most widely studied plant-based coagulants and discusses their NOM and turbidity removal. It investigates recent analytical tools applied in their characterisation and floc morphological studies. The paper also investigates the effects of operating parameters such as coagulant dose, temperature, and pH, on NOM and turbidity removal. It also reviews up-to-date PCPs biophysical properties and CF mechanism and examines the efficiency of their extraction methods in reducing NOM. Finally, it discusses and suggests ways to overcome commercialisation draw-back caused by nutrient addition.Version
Accepted manuscriptCitation
Okoro BU, Sharifi S, Jesson MA and Bridgeman J (2021) Natural organic matter (NOM) and turbidity removal by plant-based coagulants: A review. Journal of Environmental Chemical Engineering. 9(6): 106588.Link to Version of Record
https://doi.org/10.1016/j.jece.2021.106588Type
Articleae974a485f413a2113503eed53cd6c53
https://doi.org/10.1016/j.jece.2021.106588