Effect of thermal pretreatment on the physical and chemical properties of municipal biomass waste.
The effects of thermal pretreatment on the physical and chemical properties of three typical municipal biomass wastes (MBWs), kitchen waste (KW), vegetable/fruit residue (VFR), and waste activated sludge (WAS) were investigated. The results show that thermal pretreatment at 175 °C/60 min significantly decreases viscosity, improves the MBW dewatering performance, as well as increases soluble chemical oxygen demand, soluble sugar, soluble protein, and especially organic compounds with molecular weights >10 kDa. For KW, VFR and WAS, 59.7%, 58.5% and 25.2% of the organic compounds can be separated in the liquid phase after thermal treatment. WAS achieves a 34.8% methane potential increase and a doubled methane production rate after thermal pretreatment. In contrast, KW and VFR show 7.9% and 11.7% methane decrease because of melanoidin production.
School of Environment, Tsinghua University, Beijing 100084, China. liuxiao07@mails.tsinghua.edu.cn
Xiao
X
Liu
Wei
W
Wang
Xingbao
X
Gao
Yingjun
Y
Zhou
Renjie
R
Shen
D001421:Bacteria, Anaerobic / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D006358:Hot Temperature; D008697:Methane / Q000096:biosynthesis; D008970:Molecular Weight; D009930:Organic Chemicals / Q000737:chemistry; D011108:Polymers / Q000737:chemistry / Q000378:metabolism; D012037:Refuse Disposal; D012722:Sewage / Q000737:chemistry*; D014783:Viscosity; D014865:Waste Disposal, Fluid; D014866:Waste Products / Q000032:analysis*
D009930:Organic Chemicals; D011108:Polymers; D012722:Sewage; D014866:Waste Products; C011908:melanoidin polymers; D008697:Methane