Removal of Arsenic from Aqueous Environments Using Moringa peregrina Seed Extract as a Natural Coagulant

Abstract

Arsenic is considered as one of the most hazardous elements for the living organisms and its presence in natural waters, can result in serious environmental problems. In this study, Moringa peregrina seed extract ability in a batch system to remove arsenate from aqueous solutions was investigated. The effects of major operating variables such as coagulant dose (0.1-5 mL L -1 ) and pH (2-11) were investigated. The optimum pH for removal of arsenic by coagulation using Moringa peregrina seed extract was 6 and the highest removal was found to be 98.61, 99.032 and 98.976 % at initial arsenic(V) concentration 100, 200 and 500 µg L -1 respectively, as a result of precipitation, co-precipitation and adsorption mechanisms. According to achieved results, it was defined that Moringa peregrina seed extract not only was an inexpensive coagulant, but also a quite effective factor in removal of arsenic(V) from aqueous environments.

Turbidity removal from aqueous environments by Pistacia atlantica (Baneh) seed extract as a natural organic coagulant aid

“…This result is in agreement with those results obtained by Ndabigengesere et al on removal of turbidity by M. Oleifera seed extract [27], and also by Bazrafshan et al on arsenic removal by M. peregrine seed extract [10]. Moreover, they reported that the efficiency of the M. Oleifera extract as a coagulant is not affected by pH.…”

“…Chestnut and acorn seed extracts [9], Moringa peregrine seed [10], Pistacia atlantica [11], Cactus [12], Moringa oleifera seed [13], tannin [14], Acacia mearnsii [15], and Cassia angustifolia seed [16] are some of the natural coagulants used for turbidity, suspended solids, color, and other pollutants removal from aqueous solutions.…”

Alleviation of Cadmium Toxicity in Triticum aestivum Using the Coagulant Defatted Moringa oleifera and Moringa peregrina Seeds Powder.

“…The industrial activities greatly polluted the environment and deteriorate the ecosystems due to the presence of contaminants in their effluent (Lenardão et al 2003), from these activities contaminant toxic heavy metals that cause damage to ecosystems and human health due to their incorporation into the food chain (Bazrafshan et al, 2013). Cadmium is considered as the most poisonous heavy metals even at low doses (Yurtsever and Sengil 2009), the presence of excessive amount of Cd in soil causes many toxic symptoms in plants such as chlorosis, growth inhibition, browning of root tips and finally death (Guo et al, 2008).…”

“…Cadmium is considered as the most poisonous heavy metals even at low doses (Yurtsever and Sengil 2009), the presence of excessive amount of Cd in soil causes many toxic symptoms in plants such as chlorosis, growth inhibition, browning of root tips and finally death (Guo et al, 2008). For the removal of heavy metals, there are many synthetic coagulants such as activated carbon which was used widely in the treatment of effluents (Wan Ngah and Hanafiah, 2008), also synthetic coagulants of aluminum (alum lime, aluminum sulphate, and polyaluminum silico sulphate), ferric salts (iron hydroxide and iron chloride) and soda ash are also widely used processes (Bazrafshan et al, 2013). But their use in large scale becomes costly and in some cases has limited application and also serious to the environment (Ahluwalia and Goyal, 2007).…”

Arsenic removal from aqueous solutions using Saccharomyces cerevisiae: Kinetic and equilibrium study

“…As(V) and As(III) are two main forms of arsenic in aqueous environments . According to world health organization (WHO), the maximum permissible level of arsenic has been determined to be 10 μg/L in drinking water . Based on investigations, arsenic removal has been studied by various technologies, that is, ion exchange , reverse osmosis , adsorption , coagulation , nanoparticle , and photocatalytic oxidation .…”