Dose Optimization for Aluminium and Iron Based Coagulants viz., Aluminium Sulphate, Ferric Chloride and Ferrous Sulphate for COD Removal from Landfill Leachate at its Natural pH (original) (raw)
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Preliminary Tests of Cod Removal from Landfill Leachate Using Coagulation-Flocculation Processes
Architecture Civil Engineering Environment, 2009
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Treatment of Landfill Leachate through Coagulation Process
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Cod Removal from Landfill Leachate Using Fenton Oxidation and Coagulation
Architecture Civil Engineering Environment, 2010
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Landfill Leachate Treatment by Coagulation and Flocculation Process
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This aim of study is to assess the diagnosis of leachate impacts on the soil of the closed landfill of the city of Mohammedia for several years and the treatment of these releases by coagulation-flocculation with a liquid effluent rich in FeCl 3 rejected by a company of steel (Maghreb STEEL) and also by alginate produced less expensive. Indeed, the leachate generated from closed dumping site at MESBAHIATE (Mohammedia, Morocco) was investigated. This leachate is characterized by a high chemical oxygen demand (COD) content which varies around 3,000 mg/L, a Kjeldahl total nitrogen concentration varying around 1,500 mg/L whereas the content in ammonium has a concentration of 960 mg/L. In addition, the BOD 5 /COD ratio is much less than 0.2, which indicates that the organic matter is not easily biodegradable, and subsequently justifies the use of physico-chemical treatments such as coagulation-flocculation. In order to monitor the leachate treatment by coagulation flocculation, several parameters were analyzed including: the turbidity, the COD, and the volume of the sludge decanted. The results showed that coagulation-flocculation by ferric chloride and alginate were very effective for reducing turbidity. This reduction reaches 95% and 86% for FeCl 3 and Alginate, respectively. The removal of COD by FeCl 3 30% and Alginate showed yields of 67% and 60%, respectively at optimal concentrations of 120 and 2,500 mg/L, respectively, for Alginate and FeCl 3 30%.
Reduction of COD and turbidity in leachates through coagulation-adsorption
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Department of Civil Engineering, National Institute of Technology, Manipur-795004<br> Email: albinoiit@gmail.com In this study, aluminium sulphate, ferric chloride and polyaluminium chloride coagulants were employed for reduction of organic colloids through cogulation-floculation and then adsorption using Parkia Speciosa (Petai) pods activated carbon for removal of dissolved ions from leachate. Polyaluminium chloride showed maximum turbidity reduction of 93.25% and 96.80% at optimum pH 4 for fresh and stabilized leachate respectively as compared to that of aluminium sulphate and ferric chloride with turbidity removals ranging from 70% to 91% for both types of leachate. The optimum doses of aluminium sulphate, ferric chloride and polyaluminium chloride for fresh leachate were 8 g/L with corresponding COD removals of 80%, 90% and 75% respectively. However, for stabilized leachate COD reduction, polyaluminium chloride and ferric chloride exhibits the same removals of 77.78% using...
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Different treatment strategies for highly polluted landfill leachate in developing countries
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