Effect of pretreatment and biomass blending on bio-oil and biochar quality from two-step slow pyrolysis of rice straw

• DOI: 10.1016/j.wasman.2021.12.013
• Publication Date: 2021-12-15T14:51:56Z
• Authors: Anubhuti Bhatnagar; Abhishek Singhal; Henrik Tolvanen; Kati Valtonen; Tero Joronen; Jukka Konttinen
• Keywords: Levoglucosan

This study investigated biomass blending and water washing to improve product quality from two-step pyrolysis of rice straw. Rice straw (RS) was mixed with groundnut shells (GNS) wheat (WS) in different weight ratios. Blending RS GNS/WS a 1:1 ratio increased the total bio-oil yields by 7-9% reduced gas char 5-7% < 2%, respectively. washed separately examine effect removing water-soluble ash elements. The optimum duration 60 min; removal efficiency then 26%. 4% over unwashed straw, decreased. Combining processes levoglucosan yield 1.6-2.1 times compared RS, content ∼ 10%. Moreover, biochar samples obtained after blends had potential fuel applications owing low fouling or slagging propensity. They also possible use soil for adsorption contaminants increasing acidic pH, likely stability 1000 years ground. These results provide promising alternative efficiently converting multiple value-added products.