title: Prewashing enhances the liquid hot water pretreatment efficiency of waste wheat straw with high free ash content.
abstract: The effect of prewashing process prior to the liquid hot water (LHW) pretreatment of high free ash content waste wheat straw (WWS) was investigated. It was found that prewashing process decreased the ash content of WWS greatly, from 29.48% to 9.82%. This contributed to the lower pH value of prehydrolyzate and higher xylan removal in the following LHW pretreatment. More importantly, the prewashing process effectively increased the cellulose enzymatic hydrolysis efficiency of pretreated WWS, from 53.04% to 84.15%. The acid buffering capacity (ABC) and cation exchange capacity (CEC) of raw and prewashed WWS were examined. The majority of free ash removal from WWS by prewashing resulted in the decrease of the ABC of the WWS from 211.74 to 61.81mmol/pH-kg, and potentially enhancing the efficiency of the follow-up LHW pretreatment.
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Huang
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Xinxing
authors.initials: X
authors.lastname: Wu
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Huang
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China; Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Chenhuan
authors.initials: C
authors.lastname: Lai
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China; Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China; Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China. Electronic address: swhx@njfu.com.cn.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Yong
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D006358:Hot Temperature; D006868:Hydrolysis; D014908:Triticum / Q000737:chemistry*; D014866:Waste Products; D014867:Water
chemical_list: D014866:Waste Products; D014867:Water; D002482:Cellulose
keywords: Acid buffering capacity; Cation exchange capacity; Enzymatic hydrolysis efficiency; Liquid hot water pretreatment; Prewashing