Innovative physico-chemical treatment of wastewater incorporating Moringa oleifera seed coagulant

Bhuptawat, Hitendra; Folkard, G.K.; Chaudhari, Sanjeev

doi:10.1016/j.jhazmat.2006.08.044

Cited by 158 publications

(100 citation statements)

References 22 publications

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“…Similarly, for the response variables, turbidity and COD, removals of 98.1 % and 75.4 % were obtained respectively. These results are higher to those reported by Bhuptawat et al [23] and Subramonian et al [20], who found COD removals of 50 % and 36.2 % for the natural coagulants Moringa oleifera and Cassia obtusifolia, respectively. In addition, we found that the BOD decreased from 323 mg/l in the untreated wastewater to 91 mg/l in the wastewater treated with thermal water, obtaining a 71.8 % removal.…”

Section: Figcontrasting

confidence: 70%

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Treatment of landfill leachate by using lateritic soil as a natural coagulant

Syafalni

Lim

Ismail

et al. 2012

Journal of Environmental Management

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In the last several years, the interest on domestic wastewater treatment has increased due to the rise of water consumption resulted from the world population growth. The excessive use of inorganic coagulants, such as aluminum sulphate, in domestic wastewater treatment processes contributes to generate high negative environmental impacts and risks to living organisms. Besides its low biodegradability, as aluminum sulphate increases metal content in discharged effluents rises, generating toxic sludge. Therefore, searching for clean and sustainable processes for domestic wastewater treatment is important in order to reduce the pollutant discharges into fresh water bodies. In this paper, the potential use of thermal water as a natural coagulant for the domestic wastewater treatment from Manizales city (department of Caldas, Colombia), was studied. The effect of coagulant dose was analyzed and compared with the results of the conventional coagulants. Applying different doses of coagulants in domestic wastewater showed that the best coagulation activity was achieved by adding 35 ml/l of thermal water, and 140 mg/l of aluminum sulphate. In both cases, high turbidity removal efficiency (98.1 %) was achieved. The removal efficiency of Chemical Oxygen Demand (COD) using aluminum sulphate was 81.5 %, and using thermal water was 75.4 %. In conclusion, thermal water has positive coagulation properties; therefore, it is a promising alternative to aluminum sulphate as a natural coagulant on the treatment of domestic wastewater.Keywords: coagulation; domestic wastewater; pollutant removal; thermal water; water treatment. ResumenEl consumo del agua y, por ende, la cantidad de agua residual producida, ha venido aumentado, proporcionalmente, con el crecimiento de la población. El excesivo uso de coagulantes inorgánicos, como el sulfato de aluminio, en los procesos de tratamiento de agua residual doméstica, contribuye a generar altos impactos negativos y riesgos para los organismos vivos; además, estos tienen baja biodegradabilidad, incrementan el contenido de metales en los efluentes y generan lodos tóxicos. En consecuencia, la búsqueda de procesos limpios y sostenibles para Use of thermal water as a natural coagulant for domestic wastewater sustainable treatment el tratamiento de aguas residuales domésticas se ha incrementado en los últimos años, como alternativa para reducir los contaminantes que son vertidos en aguas superficiales. En este trabajo se estudió el potencial uso del agua termal como coagulante natural para el tratamiento del agua residual doméstica de la ciudad de Manizales (departamento de Caldas, Colombia). El efecto de la dosis de agua termal como coagulante fue analizado y comparado con los resultados obtenidos en las mismas condiciones con el coagulante convencional (sulfato de aluminio). Se encontró una dosis óptima igual a 140 mg/l para sulfato de aluminio y de 35 ml/l para el agua termal, obteniendo porcentajes de remoción de turbiedad de 98,1 % en ambos coagulantes. Finalmente, se encontró que el ...

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Section: Figcontrasting

confidence: 70%

“…Rapid mixing was followed by the flocculation process at 30 rpm for 20 minutes. After this time, the stirring process was stopped, and sedimentation was allowed for 30 minutes [23].…”

Section: Coagulation-jar Testmentioning

confidence: 99%

Treatment of landfill leachate by using lateritic soil as a natural coagulant

Syafalni

Lim

Ismail

et al. 2012

Journal of Environmental Management

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“…This refers to the high level of COD that is generally associated with threats to the human health. The results in Table 1 have not met what had been found by Bhuptawat et al (2007). However, the overall treatment processes have not been affected by the increase of COD due to the natural coagulant used in the wastewater treatment.…”

Section: River Watermentioning

confidence: 64%

The use of Moringa oleifera seed as a natural coagulant for wastewater treatment and heavy metals removal

et al. 2016

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Moringa oleifera (MO) is a multipurpose tree with considerable potential and its cultivation is currently being actively promoted in many developing countries. Seeds of this tropical tree contain water-soluble, positively charged proteins that act as an effective coagulant for water and wastewater treatment. Based on this, water quality of ''Sungai baluk'' river was examined before and after the treatment using MO seed. MO seed exhibited high efficiency in the reduction and prevention of the bacterial growth in both wastewater and ''Sungai baluk'' river samples. The turbidity was removed up to 85-94% and dissolved oxygen (DO) was improved from 2.58 ± 0.01 to 4.00 ± 0.00 mg/L. The chemical oxygen demand (COD) and biological oxygen demand (BOD) were increased after the treatment from 99.5 ± 0.71 to 164.0 ± 2.83 mg/L for COD and from 48.00 ± 0.42 to 76.65 ± 2.33 mg/L for BOD, respectively. Nevertheless, there was no significant alteration of pH, conductivity, salinity and total dissolved solid after the treatment. Heavy metals such as Fe were fully eliminated, whereas Cu and Cd were successfully removed by up to 98%. The reduction of Pb was also achieved by up to 78.1%. Overall, 1% of MO seed cake was enough to remove heavy metals from the water samples. This preliminary laboratory result confirms the great potential of MO seed in wastewater treatment applications.

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“…These advantages are even better if the plants used to extract the coagulant are autochthonous from the rural communities [16,17]. Generally, the mechanisms followed by natural coagulants are ruled by the absorption processes and the subsequent charge neutralization or polymeric bridge effect [15].…”

Section: Introductionmentioning

confidence: 99%