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ThesisItem Open Access Comparative study of Ageratum conyzoides dead biomass and its biochar for heavy metal removal from industrial wastewater(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-05) Anusha, B.V.; Saraswat, ShwetaThe present study was done in order to evaluate the use of Ageratum conyzoides biomass (DB) and its biochar (BC) for the heavy metal removal from electroplating industry wastewater. The analyses of both Ageratum conyzoides DB and its BC were carried out to study their physico-chemical properties. The initial concentrations of various parameters in the electroplating industry wastewater were analyzed to determine the heavy metal load in the wastewater. Ageratum conyzoides DB and BC were used as adsorbents for the adsorption of heavy metals which includes zinc, cadmium, chromium and lead present in the wastewater sample. Heavy metal removal per cent at different dosage of Ageratum conyzoides DB and BC, varying pH and at different time interval from the wastewater was studied. Heavy metal adsorption using BC was more in all the treatments compared to A. conyzoides DB. Maximum removal using A. conyzoides DB was 62.45%, 45.63%, 98.05% and 78.65% for Zn, Cd, Cr and Pd, respectively and for A. conyzoides BC was 98.65%, 51.83%, 100 % and 80.05%. Order of adsorption was Cr>Pd>Zn>Cd with DB and Cr>Zn>Pd>Cd with BC. Within 30min rate of adsorption was maximum though further increase contact time showed higher per cent removal, rate of adsorption decreased. Maximum adsorption of heavy metals was seen at pH 6 using Ageratum conyzoides DB, whereas Ageratum conyzoides BC showed maximum adsorption at different pH for different metals. Ageratum conyzoides can be successfully utilized as DB powder or converted to BC to treat the industrial wastewater and bring down the heavy metal concentration below permissible limit.