[1]范子奇,王应军,任垠安.CaO2联合热预处理对污泥产酸的影响及菌群分析[J].中国给水排水,2021,37(15):21-27.
　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):21-27.
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CaO2联合热预处理对污泥产酸的影响及菌群分析

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第37卷 期数: 2021年第15期 页码: 21-27 栏目: 出版日期: 2021-08-01
Title:
Effect of Calcium Peroxide Combined with Thermal Pretreatment on Acid Production of Sludge and Analysis of Bacterial Community
作者:
范子奇1，王应军1，任垠安2
(1.四川农业大学环境学院，四川成都611130；2.中铁十一局集团第五工程有限公司，重庆400037)
Author(s):
FAN Zi-qi1,WANG Ying-jun1,REN Yin-an2
(1. College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China; 2. The 5th Engineering Co. Ltd. of China Railway 11th Bureau Group, Chongqing 400037, China)
关键词:
污泥厌氧消化; 过氧化钙; 热预处理; 挥发性脂肪酸; 微生物多样性
Keywords:
sludge anaerobic digestion; calcium peroxide; thermal pretreatment; VFAs; microbial diversity
摘要:
以过氧化钙(CaO2)联合热预处理剩余污泥后进行产酸发酵，分析溶解性COD（SCOD）、pH值、挥发性脂肪酸(VFAs)产量及微生物群落的变化，并以获得最高产量的VFAs为目的，得到最佳预处理工艺参数。结果表明，预处理能使污泥发酵初始SCOD含量上升；碱量固定时，所有实验组的SCOD含量均呈先上升后下降的趋势。预处理中温度的增加会使初始pH值呈下降趋势；相同温度下，随着碱量的增加，初始pH值升高。CaO2联合热预处理对VFAs生成有促进作用。0.2 g/gVSS的CaO2+90 ℃实验组、0.3 g/gVSS的CaO2+70 ℃实验组的VFAs最大产量分别为3 101.7、3 097.4 mg/L，而前者达到峰值的发酵时间较早，故0.2 g/gVSS的CaO2+90 ℃实验组为最佳方案。微生物测序结果表明，预处理均会增加后续发酵系统中产酸相关细菌的丰度，降低污泥中菌群总体丰度，其中联合预处理造成的菌群结构变化更显著。
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.

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[1]武鹏崑,崔常桂,查凯,等.PFS对污泥厌氧消化中沼气脱硫的影响[J].中国给水排水,2020,36(17):75.
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更新日期/Last Update: 2021-08-01