TY - JOUR
T1 - Effects of different thermal pretreatments on the biodegradability and bioaccessibility of sewage sludge
AU - Zhang, Yucheng
AU - Xu, Suyun
AU - Cui, Minghao
AU - WONG, Jonathan W C
N1 - Funding Information:
The authors wish to thank the financial supports from National Natural Science Foundation of China (51308337), Science and Technology Development Project of USST (2018KJFZ111).
Funding Information:
The authors wish to thank the financial supports from National Natural Science Foundation of China ( 51308337 ), Science and Technology Development Project of USST ( 2018KJFZ111 ).
PY - 2019/7/1
Y1 - 2019/7/1
N2 - Thermal hydrolysis has proven to be a successful approach to make sewage sludge more amenable to anaerobic digestion. Three heat pretreatment scenarios were compared in this study, i.e. thermal alkaline treatment (LAT, 0.1 M NaOH, 80 °C), low temperature thermal treatment (LT, 80 °C) and high temperature thermal treatment (HT, 170 °C). The biodegradability of pretreated sludge was testified by using biochemical methane potential (BMP) test, meanwhile, the repartition and complexities of organic matters in sludge subjected to various pretreatments were characterized by a revised chemical extraction protocol combined with 3D fluorescence spectroscopy. The cumulative methane yield of sewage sludge was significantly increased by LAT (+135%), LT (+95%) and HT (+112%) as compared to the control. Nevertheless, results show that the solubilization degree of sludge was insignificantly correlated to BMP values, meanwhile high correlation values were observed for the soluble polysaccharide concentration in hydrolysate. The degradation rates of bioaccessible fraction of soluble particulate organic matter (SPOM) and readily extractible organic matter (REOM) were improved after thermal pretreatments at varied levels, which indicates that the chemical accessibility is positively correlated with the bioaccessibility. Furthermore, the biodegradable index Fdigestion was proposed to evaluate the biodegradability of organic matter, which is helpful for the optimization of various pretreatment strategies.
AB - Thermal hydrolysis has proven to be a successful approach to make sewage sludge more amenable to anaerobic digestion. Three heat pretreatment scenarios were compared in this study, i.e. thermal alkaline treatment (LAT, 0.1 M NaOH, 80 °C), low temperature thermal treatment (LT, 80 °C) and high temperature thermal treatment (HT, 170 °C). The biodegradability of pretreated sludge was testified by using biochemical methane potential (BMP) test, meanwhile, the repartition and complexities of organic matters in sludge subjected to various pretreatments were characterized by a revised chemical extraction protocol combined with 3D fluorescence spectroscopy. The cumulative methane yield of sewage sludge was significantly increased by LAT (+135%), LT (+95%) and HT (+112%) as compared to the control. Nevertheless, results show that the solubilization degree of sludge was insignificantly correlated to BMP values, meanwhile high correlation values were observed for the soluble polysaccharide concentration in hydrolysate. The degradation rates of bioaccessible fraction of soluble particulate organic matter (SPOM) and readily extractible organic matter (REOM) were improved after thermal pretreatments at varied levels, which indicates that the chemical accessibility is positively correlated with the bioaccessibility. Furthermore, the biodegradable index Fdigestion was proposed to evaluate the biodegradability of organic matter, which is helpful for the optimization of various pretreatment strategies.
KW - Anaerobic biodegradability
KW - Bioaccessibility
KW - Chemical sequential extraction
KW - Fluorescence spectroscopy
KW - Humic substance
KW - Pretreatment
UR - http://www.scopus.com/inward/record.url?scp=85066279289&partnerID=8YFLogxK
U2 - 10.1016/j.wasman.2019.05.047
DO - 10.1016/j.wasman.2019.05.047
M3 - Journal article
C2 - 31279397
AN - SCOPUS:85066279289
SN - 0956-053X
VL - 94
SP - 68
EP - 76
JO - Waste Management
JF - Waste Management
ER -