Lentil waste as novel natural coagulant for agricultural wastewater treatment

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Siong-Chin ChuaYeek-Chia Ho

Abstract

Increasing agricultural irrigation to counteract a soil moisture deficit has resulted in the production of hazardous agricultural wastewater with high turbidity and chemical oxygen demand (COD). An innovative, sustainable, and effective solution is needed to overcome the pollution and water scarcity issues caused by the agricultural anthropogenic processes. This research focused on a sustainable solution that utilized a waste (broken lentil) as natural coagulant for turbidity and COD removal in agricultural wastewater treatment. The efficiency of the lentil extract (LE), grafted lentil extract (LE-g-DMC) and aluminium sulphate (alum) coagulants was optimized through the response surface methodology. Three-level Box-Behnken design was used to statistically visualize the complex interactions of pH, concentration of coagulants and settling time. LE achieved a significant 99.55% and 79.87% removal of turbidity and COD at pH 4, 88.46 mg/L of LE and 6.9 minutes of settling time, whereas LE-g-DMC achieved 99.83% and 80.32% removal of turbidity and COD at pH 6.7, 63.08 mg/L of LE-g-DMC and 5 minutes of settling time. As compared to alum, LE-g-DMC required approximately 30% less concentration. Moreover, LE and LE-g-DMC also required 75%...Continue Reading

References

Apr 28, 2007·Water Research·Brian Bolto, John Gregory
Dec 3, 2014·Journal of Environmental Sciences (China)·Sook Yan ChoyRamakrishnan Nagasundara Ramanan
Jan 17, 2017·Journal of Environmental Management·Edison GilPavasMiguel Ángel Gómez-García
Jan 28, 2017·Scientific Reports·Michiru NishitaYasuhiro Minami
Feb 11, 2018·Journal of Environmental Management·Meysam Mohammad MomeniSaeid Ghanbarian
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May 14, 2019·Waste Management·Alberto D WeblerVítor J P Vilar
Jan 9, 2020·Scientific Reports·Ana RakitaAdelheid Elbe-Bürger

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