FAN Zi-qi,WANG Ying-jun,REN Yin-an.Effect of Calcium Peroxide Combined with Thermal Pretreatment on Acid Production of Sludge and Analysis of Bacterial Community[J].China Water & Wastewater,2021,37(15 15):21-27.
Effect of Calcium Peroxide Combined with Thermal Pretreatment on Acid Production of Sludge and Analysis of Bacterial Community
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
15 15
Page:
21-27
Column:
Date of publication:
2021-08-01
- Keywords:
- sludge anaerobic digestion; calcium peroxide; thermal pretreatment; VFAs; microbial diversity
- Abstract:
- In order to obtain the highest yield of volatile fatty acids (VFAs) and get the optimal parameters of pretreatment process, excess sludge was pretreated by calcium peroxide (CaO2) and heat for acidogenic fermentation, variations in dissolved chemical oxygen demand (SCOD), pH, VFAs yields and microbial community in the system were analyzed. Pretreatment could increase the initial SCOD of sludge fermentation. When alkalinity was constant, SCOD of all the experimental groups increased first and then decreased. Initial pH decreased with the increase of pretreatment temperature. At the same temperature, the initial pH value increased with the increase of the alkalinity. CaO2 combined with thermal pretreatment promoted the VFAs production. The maximum VFAs yields of 0.2 g/gVSS CaO2+90 ℃ group and 0.3 g/gVSS CaO2+70 ℃ group were 3 101.7 mg/L and 3 097.4 mg/L, respectively, and the former reached the peak earlier. Therefore, the 0.2 g/gVSS CaO2+90 ℃ group was considered to be the best experimental scheme. Microbial sequencing showed that pretreatment would increase the abundance of acid producing bacteria in the subsequent fermentation system and reduce the abundance of total bacterial community in the sludge, and the change of microbial community composition caused by the combined pretreatment was more significant.
Last Update:
2021-08-01