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

Abstract

A B S T R A C TCoagulation/flocculation, as an important step in water treatment processes, is applied for turbidity removal of raw water coming from suspended particles and colloidal material. In this study, the ability of Pistacia atlantica seed extract, as a natural organic coagulant aid along with ferric chloride for turbidity removal from synthetic solutions, was investigated. Coagulation ability of this coagulant was assessed by the use of standard jar test measurement. The influence of several operating parameters such as, pH (2-12), coagulant dose (2-35 mg/L), natural coagulant aid dose (0.1-5.0 ml/L), and initial turbidity (20-200 NTU), were investigated. The optimum pH for removal of turbidity by coagulation process using P. atlantica seed extract was found 9-10 with coagulant dose 1 ml/L (in combination with FeCl 3 at dose 2 mg/L). The results obtained with synthetic solutions revealed that the most effective removal efficiency of turbidity (97.43%) was achieved with natural coagulant dose 0.4 ml/L and FeCl 3 10 mg/L at pH 9. In addition, the highest removal efficiency was obtained at higher initial turbidities. According to the results of this study and with respect to the abundance of this tree in various regions of Iran, especially in mountain areas, its use as a natural coagulant for turbidity removal from aqueous environments is possible and viable specifically for rural areas and small communities.

Preliminary analysis of selected tropical fruit seed extracts potential as natural coagulant in water

“…These proteins involve in charge neutralization and adsorption of a colloidal particle in water. Bodlund [28] has demonstrated that protein content in coagulant active extract influences the coagulation process during turbidity removal. It is known that -active coagulant extract from fruit seed acts as a coagulating agent which is non-ionic and involves in coagulation mechanisms.…”

Coagulación natural para la descontaminación de efluentes industriales

“…Se ha reportado la remoción de caolín mediante extractos de semillas de Pistacia atlantica (Bazrafshan, Mostafapour, Ahmadabadi, & Mahvi, 2015). Efluentes contaminados con colorantes para pinturas acrílicas se han decolorado con la adición de Cactus opuntia (ficus-indica) con un 94% de eficiencia en la remoción del color, demanda química de oxígeno y turbidez (Vishali & Karthikeyan, 2015).…”

“…Según resultados experimentales, a pH ácido, entre 1 y 6, la remoción de turbidez fue entre 79,4 y 92,1%, pero a pH básico, entre 10 y 12,5, la remoción fue entre 81,6 y 99,2%. Según el grado de compactación y estabilidad mecánica, a valores de pH básicos se obtiene la mejor calidad del lodo residual (Bazrafshan et al, 2015). contaminación coloidal, por tanto los extractos de guarango disponen de un carácter electropositivo en la desestabilización coloidal, de acuerdo con los mecanismos de neutralización de cargas.…”

Potential application of natural coagulant extraction from walnut seeds for water turbidity removal

“…However, there are some disadvantages induced by using chemical coagulants such as relatively high costs, low-effectiveness at low temperature, production of large volume of sludge, affect the treated water pH, and adverse effects on human health (Bazrafshan et al 2015;de Oliveira Cardoso Nascimento et al 2021). Furthermore, the resulting elevated concentration of aluminum residuals in water are linked with neurodegenerative diseases such as Alzheimer's, as well as neurotoxic and carcinogenic effects (Rondeau et al 2000;Huang et al 2015).…”