TY - GEN
T1 - Mesophilic and thermophilic digestion of thickened waste activated sludge
T2 - 2010 International Conference of Environment Materials and Environment Management, EMEM 2010
AU - Chi, Yong Zhi
AU - Li, Yu You
AU - Ji, Min
AU - Qiang, Hong
AU - Deng, Heng Wei
AU - Wu, Ya Peng
PY - 2010
Y1 - 2010
N2 - This paper presents an experimental study over 204 days on anaerobic degradation of thickened waste activated sludge (TWAS) from a municipal wastewater treatment plant (WWTP). The experiments were conducted under thermophilic (55°) and mesophilic (35°) condition, respectively, by using the semi-continuous flow completely mixed reactors. The influent total solids (TS), hydraulic retention time (HRT) and chemical oxygen demand (COD) loading levels were around 4%, 30 days and 1.67 kg-CODCr· m-3·d-1 , respectively. During the opration period, the thermophilic anaerobic digestion process (TADP) and the mesophilic anaerobic digestion process (MADP) were stable and well-functioned without ammonia inhibition. Particulate organic matters reduction of TADP was superior to that of MADP. This result implies that TADP has higher sludge reduction efficiency than MADP. According to the simulated chemical formula of TWAS, C5.85H9.75O3.96N, and the stoichiometric equation, the methane content and the ammonia yield in the anaerobic process could be calculated, which were consistent with the experimental results. The methane yield of TADP was a little higher than that of MADP. The statistical mean values of methane content for TADP and MADP were 60.97% and 62.38%, respectively.According to paired t-test, there was a significant difference in methane content between TADP and MADP(α=0.01, n=62). Compared with the mesophilic digested sludge, the dewaterability of thermophilic digested sludge was lower.
AB - This paper presents an experimental study over 204 days on anaerobic degradation of thickened waste activated sludge (TWAS) from a municipal wastewater treatment plant (WWTP). The experiments were conducted under thermophilic (55°) and mesophilic (35°) condition, respectively, by using the semi-continuous flow completely mixed reactors. The influent total solids (TS), hydraulic retention time (HRT) and chemical oxygen demand (COD) loading levels were around 4%, 30 days and 1.67 kg-CODCr· m-3·d-1 , respectively. During the opration period, the thermophilic anaerobic digestion process (TADP) and the mesophilic anaerobic digestion process (MADP) were stable and well-functioned without ammonia inhibition. Particulate organic matters reduction of TADP was superior to that of MADP. This result implies that TADP has higher sludge reduction efficiency than MADP. According to the simulated chemical formula of TWAS, C5.85H9.75O3.96N, and the stoichiometric equation, the methane content and the ammonia yield in the anaerobic process could be calculated, which were consistent with the experimental results. The methane yield of TADP was a little higher than that of MADP. The statistical mean values of methane content for TADP and MADP were 60.97% and 62.38%, respectively.According to paired t-test, there was a significant difference in methane content between TADP and MADP(α=0.01, n=62). Compared with the mesophilic digested sludge, the dewaterability of thermophilic digested sludge was lower.
KW - Anaerobic digestion
KW - Comparison
KW - Mesophilic
KW - Thermophilic
KW - Thickened waste activated sludge
UR - http://www.scopus.com/inward/record.url?scp=78650768953&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78650768953&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.113-116.450
DO - 10.4028/www.scientific.net/AMR.113-116.450
M3 - Conference contribution
AN - SCOPUS:78650768953
SN - 9780878492596
T3 - Advanced Materials Research
SP - 450
EP - 458
BT - Environment Materials and Environment Management
Y2 - 24 July 2010 through 25 July 2010
ER -
