In-Situ Utilization Of Inorganic Solid Wastes Of Pulp And Paper Industry For Removal Of Chemical Oxygen Demand And Colour From Its Alkali Extracted Effluent

IJEP 41(11): 1210-1217 : Vol. 41 Issue. 11 (November 2021)

Shaveta Kakkar1, Anju Malik1* and Sanju Bala Dhull2

1. Chaudhary Devi Lal University, Department of Energy and Environmental Sciences, Sirsa – 125 055, Haryana, India
2. Chaudhary Devi Lal University, Department of Food Science and Technology, Sirsa – 125 055, Haryana, India


Present work aims to explore the in-situ utilization potential of three inorganic wastes of pulp and paper industry, namely lime sludge, grits and dregs, for removal of chemical oxygen demand (COD) and colour from alkali extracted (EOP) effluent of the pulp and paper industry. Characterization of all three types of solid wastes was done for moisture, bulk density, volatile organic carbons, ash content, loss on ignition (200-900°C), pH and silica by following standard IS methods. EOP effluent was analyzed for pH, colour and COD content. Batch mode experiments were conducted for optimization of experimental conditions for colour and COD removal. The investigation illustrated that grits have the highest efficiency for colour (89.43%) and COD (78.24%) removal in comparison to lime sludge and dregs with adsorbent dose of 5.0 g/100 mL, at 60 min, 100 rpm and sample pH 8.9 from alkali extracted (EOP) effluent. FTIR was used to illustrate the mechanism of sorption by classifying functional groups present on all three inorganic wastes. The FTIR analysis indicates that carbonate is the main constituent of lime sludge and grits.


Lime sludge, Grits, Dregs, Colour, Chemical oxygen demand, Pulp and paper industry


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