Characterization and evaluation of biochar for removal of water pollutants from pulp and paper industry
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Date
2018-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present study was done in order to evaluate the use of biochar for the pollutants
removal from pulp and paper industry wastewater. Different feedstock i.e. rice husk (RH) and coconut coir (CC) were pyrolysed to prepare biochar i.e. rice husk biochar (RH BC) and coconut coir biochar (CC BC) respectively. The analyses of both biochars were carried out to study their physico-chemical properties. The initial concentrations of various parameters in the pulp and paper industry wastewater were also analyzed to determine the pollutants load in the wastewater. The prepared biochars were used as adsorbents for the adsorption of water pollutants which include sodium, potassium, total kjeldahl nitrogen, chloride, lead and iron present in the wastewater sample. Nearly 15 treatments were carried out using different dosages of biochar i.e. 2g, 4g, 6g, 8g and 10g in 1 litre of the wastewater sample at three different retention times of about 2 hours, 3 hours and 4 hours. Maximum adsorption was achieved using RH BC at 10g dosages per litre of the sample at 4 hours retention time. It was found that RH BC has the higher efficiency towards the water pollutants removal compared to the CC BC. The removal efficiencies of various pollutant levels were statistically checked using regression analysis method. By various treatments given, the higher concentration of the pulp and paper industry wastewater was reduced and brought it under to meet the permissible limits for its discharge into the inland surface water resources. Based on the results obtained, it was found that the above biochar is a cost effective for the removal of water pollutants.
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