Reduction in Organic Waste through Recovery from Waste Paper Recycling Mill
Paper manufacturing industry is characterized by large amount of water consumption and hence
high rate of wastewater generation which is concern to water pollution. This study considers the
characterization of paper mill effluents for recovery in the form of Total Suspended Solids (TSS)
in relation to decrease in organic waste in the form of Biochemical Oxygen Demand (BOD5) and
Chemical Oxygen Demand (COD). For this purpose sedimentation and coagulation were applied.
Coagulation was performed using “Alum” to check its efficiency. The effects of dose rate and
settling time of solids were observed for TSS, BOD5 and COD removal. The average
concentrations of TDS (860-881 mg/L), TSS (822-836 mg/L), BOD (261-275 mg/L) and COD
(519-550 mg/L) were determined above the permissible limits. By comparing the level of these
parameters after sedimentation a visible decrease was observed. TDS, TSS, COD and BOD5
decrease by 19%, 37%, 17.3% and 18% for respectively. In coagulation treatment the decrease
was 84%, 89%, 86% respectively for TSS, COD and BOD. The study observed maximum
recovery in the form TSS (84%) along with BOD5 and COD. Therefore, coagulation treatment for
paper recycling mill is recommended.
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