Main content area

Fabrication of biochars obtained from valorization of biowaste and evaluation of its physicochemical properties

Narzari, Rumi, Bordoloi, Neonjyoti, Sarma, Banashree, Gogoi, Lina, Gogoi, Nirmali, Borkotoki, Bikram, Kataki, Rupam
Bioresource technology 2017 v.242 pp. 324-328
Jatropha, Millettia pinnata, Parthenium hysterophorus, biochar, bioenergy, biomass, byproducts, feedstocks, lignocellulose, nitrogen, noxious weeds, pH, pyrolysis, soil, temperature, water holding capacity
This study investigated the yields and the physicochemical properties of biochar from three different feedstocks viz., i) bioenergy byproducts (deoiled cakes of Jatropha carcus and Pongamia glabra), ii) lignocellulose biomass (Jatropha carcus seed cover), and iii) a noxious weed (Parthenium hysterophorus), obtained through slow pyrolysis at a heating rate of 40°Cmin−1 with a nitrogen flow 100mlmin−1 at a temperature range of 350–650°C. For successful utilization of biochar for C-sequestration, its ability to resist abiotic or biotic degradation was deduced from recalcitrance index R50 by using TG analysis. It was observed that the biochar produced at higher temperature had higher water holding capacity (WHC) and pH, suggesting its suitability as an amendment in soil with low water retention capacity; thus biochar may be designed to selectively improve soil chemical and physical properties by altering feedstocks and pyrolysis conditions. Biochar produced at 650°C had highest yield in the range of 28.52–39.9 wt.%.