Moringa oleifera seed as a natural coagulant to treat low-turbidity water by in-line filtration

Abstract

This study evaluated the use of Moringa oleifera (MO) seed as a natural coagulant for the removal of turbidity and apparent color in the water treatment with low initial turbidity through the in-line filtration technique. The morphology and surface charge were investigated by characterization techniques such as optical microscopy, laser particle size, and zeta potential. The cationic proteins of the MO seed were extracted in aqueous solution. The jar test showed the potability standards for turbidity and apparent color were reached in the pH range from 4.0 to 8.5 and dosages ≥ 5 mg L-1 of MO. The dominant coagulation mechanism is adsorption and charge neutralization. This study showed that treating low-turbidity water with MO seed by the in-line filtration technique is possible.

Impact of Moringa oleifera Seed-Derived Coagulants Processing Steps on Physicochemical, Residual Organic, and Cytotoxicity Properties of Treated Water

“…Coagulation concentration of M. oleifera seed-derived coagulants was calculated considering all the seed powder added for extract processing or direct addition of seed powder. This is a simple method of measuring the concentration of applied dosages of M. oleifera seed-derived coagulants, which is widely found in the literature for its easy reproducibility in low-income regions with a shortage of skilled labor [13,18,23].…”

“…The aqueous extraction of the seed powder (secondary stage) is the most frequently used method because the cationic proteins of interest are soluble in water in addition to the fact that this solvent is easily available and at low cost [8,12]. Ribeiro et al [13] achieved turbidity removal of up to 98% via in-line filtration technique of a low-turbidity (25 NTU) synthetic water with aqueous extraction of the whole-seed powder. However, to enhance the coagulant activity of the M. oleifera seed, some studies have shown that the use of saline extraction (commonly NaCl but also NaNO 3 and KCl) instead of aqueous gives even better turbidity-removal results.…”

Moringa oleifera seed husks for methylene blue dye adsorption: kinetic, equilibrium, and thermodynamic analyses

“…This plant has several applications in the food, pharmaceutical, cosmetics, and food nutrition industries due to its properties (Ueda Yamaguchi et al, 2021). Also, for many years, several studies have been investigating the potential of its seeds in drinking water treatment (Ribeiro et al, 2019), and in domestic (Vega Andrade et al, 2021) and industrial wastewater treatment (Villaseñor-Basulto et al, 2018) due to its coagulant properties. In addition to its use as a coagulant, M. oleifera seed has also been investigated as an alternative in the treatment of drinking water and wastewater as an adsorbent, for example, in the removal of heavy metals (Araújo et al, 2013) and dyes (Reck et al, 2018).…”

Estudo da cinética de floculação de águas de frigorífico de peixes utilizando um modelo fenomenológico e técnicas de aprendizado de máquina

“…Dentre eles, os processos de coagulação/floculação são muito empregados por sua versatilidade, baixo custo e simplicidade de operação (Beltrán-Heredia & Sánchez-Martín, 2009;Oladoja, 2015;Ribeiro et al, 2019). Nesse processo as impurezas em suspensão e em estado coloidal possuem carga negativa, o que gera uma força de repulsão entre elas.…”

“…A cinética de floculação no processo envolve dois fenômenos, a agregação das partículas desestabilizadas formando flocos, representada pelo coeficiente de agregação (KA) e a quebra dos flocos formados, representado pelo coeficiente de ruptura (KB) (Sekiou & Kellil, 2009;Ribeiro et al, 2019;Russo et al, 2020). Parâmetros de projeto importantes que atuam sobre estes dois fenômenos na cinética são o gradiente de velocidade e o tempo de floculação, que operados nas melhores condições de mistura lenta permitem o controle do processo, favorecendo a etapa de floculação, e consequentemente a eficiência do sistema de tratamento (Sekiou & Kellil, 2009;Ribeiro et al, 2019).…”