Effects of storage conditions of Moringa oleifera seeds on its performance in coagulation

Abstract

Moringa oleifera is a plant whose seeds have coagulation properties for treating water and wastewater. In this study the coagulation efficiency of Moringa oleifera kept in different storage conditions were studied. The Moringa oleifera seeds were stored at different conditions and durations; open container and closed container at room temperature (28 degrees C) and refrigerator (3 degrees C) for durations of 1, 3 and 5 months. Comparison between turbidity removal efficiency of Moringa oleifera kept in refrigerator and room temperature revealed that there was no significant difference between them. The Moringa oleifera kept in refrigerator and room temperature for one month showed higher turbidity removal efficiency, compared to those kept for 3 and 5 months, at both containers. The coagulation efficiency of Moringa oleifera was found to be dependent on initial turbidity of water samples. Highest turbidity removals were obtained for water with very high initial turbidity. In summary coagulation efficiency of Moringa oleifera was found independent of storage temperature and container, however coagulation efficiency of Moringa oleifera decreased as storage duration increased. In addition, Moringa oleifera can be used as a potential coagulant especially for very high turbidity water.

Adsorption study on municipal solid waste leachate using Moringa oleifera seed

“…Adsorption of COD and TDS by M. oleifera seed coagulant was influenced by pH, temperature (Oluduro and Aderiye 2007;Katayon et al 2004) and storage conditions (Katayon 2004(Katayon , 2006a. To evaluate and optimize the coagulation process, experiments were conducted at different pH (4, 5, 6, 7, 8 and 9), different temperature (300, 306, 312, 318, 324 and 330 K) and different concentration (75 and 100 mg L -1 ) with rapid mixing rotational speed of 100 rpm, slow mixing rotational speed of 20 rpm and settlement period of 60 min.…”

“…The powder joins with the materials and contaminants in the aqueous solutions and sinks to the bottom (Varsha and Punita 2010) of any treatment units. This treatment also removes 90-99 % of bacteria contained in water (Katayon et al 2005). High-quality activated carbon prepared from the waste husks of M. oleifera (Miquel and Wendy 2010;Pollard et al 1995) is used to purify the water and M. oleifera pods are efficient in absorbing organic pollutants and pesticides (Akhtar et al 2007a, b).…”

Influence of zeta potential on the flocculation of cyanobacteria cells using chitosan modified soil

“…The healthy seeds (about 1.0 cm) were selected and deshelled. The kernels were grounded in a coffee grinder to become particles of about 300 μm, stored at room temperature in an airtight container and used for one month (Katayon et al, 2006). To extract the active proteins, 5 g of the seed powder was suspended in 100 mL of 1.0 mol/L NaCl solution and the suspension was stirred using a magnetic stirrer for 30 min (Okuda et al, 2001).…”

Processamento de sementes de Moringa oleifera utilizando-se diferentes equipamentos para obtenção de solução coagulante

“…A concentração adotada para a solução foi 20000 mg L -1 sendo que, para cada 100 mL de água destilada, eram utilizados 200 miligramas de pó; após homogeneização da solução há recomendações para que a mesma seja filtrada em papel filtro, membranas ou tecidos (Okuda et al, 2001;Ndabigengesere & Narasiah, 1998;Katayon et al, 2006). Para maior facilidade operacional adotou-se o peneiramento da solução em peneira com abertura de 0,125 mm.…”

“…Há procedimentos manuais nos quais se utiliza pilão para trituração das sementes (Okuda et al, 1999;Okuda et al, 2001) podendo ocorrer, após trituração, peneiramento do pó obtido para retirada de partículas maiores (Paterniani et al, 2009;Paterniani et al, 2010). Outros autores adotam a metodologia com obtenção do pó utilizando liquidificador doméstico ou (Ndabigengesere et al, 1995;Katayon et al, 2006) e até mesmo preparo da solução diretamente no liquidificador (Madrona et al, 2010).…”