COD, color, and turbidity reduction from surface water using natural coagulants: Investigation and optimization

Abstract

Several researchers have established the performance of natural coagulants in treating water via coagulation and f locculation process. This study is aimed at investigating the use of Linseed-based natural coagulant for treating surface water, especially in rural areas where most people cannot afford the high cost of chemically coagulant- treated water. The influence of various experimental parameters such as coagulant dosage, pH, and stirring time on the percentage of color, chemical oxygen demand (COD), and turbidity removal has been studied. The ex perimental results showed that the use of Linseed has shown high removal of color (97.76 %), turbidity (96.58 %), and COD (90 %) at pH values of 3.03 using a 1.75 g/L coagulant dosage and a stirring time of 37.37 minutes. Upon the numerical optimization of the parameters investigated, the removal of color, turbidity, and COD were found to be 94.0 %, 95.5 %, and 86.35 %, respectively, at pH of 7.0, coagulant dosage of 2.5 g, and stirring time of 40 minutes. The findings showed that Linseed has excellent coagulating competence and is very effective in the removal of impurities from surface water.