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

Abstract

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 ...

Sustainable treatment of landfill leachate

“…Single use of PAC showed that turbidity, 99.18 %; color, 97.26 % and TSS, 99.22 % were achieved; whereas alum showed inferior removal (turbidity, 94.82 %; color, 92.23 % and TSS, 95.92 %) (Ghafari et al 2010). Liu et al (2012) Syafalni et al (2012) compared lateritic soil coagulant with alum in jar test experiment. The optimum condition was achieved at pH 2 and lateritic soil coagulant dose of 14 g/L resulting 65.7 % COD, 81.8 % color and 41.2 % NH 3 -N removal.…”

Boron removal from aqueous solution using coagulation- flocculation with curcumin : A response surface methodology

“…1 (a), at PAC concentration of 108.8 ppm, the boron removal efficiency was above 55%. High coagulant doses content helps in destabilization of the colloidal particles in solution (Syafalni et al, 2012). Fig.…”

Structure, Morphological, and Physicochemical Characteristics of a New Composite Coagulant Made From Polyaluminium Chloride and Agro-waste of Tapioca Peel

“…As stated by Shaylinda et al [2], a composite coagulant is made by combining two types of coagulants as one reagent by premixing the coagulants through certain working conditions. The substitution of chemical coagulants with natural materials can be applied to reduce the adverse effects, simplify the dosing process, and tackle other drawbacks [2,4]. The operation using a composite coagulant is more convenient as it shortens the treatment process and practical from a nancial perspective.…”