| 城镇污水厂剩余污泥厌氧发酵产酸工程示范研究 |
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| 引用本文： | 王率率,陆小游,姜谦,刘和,郑志永,刘宏波.城镇污水厂剩余污泥厌氧发酵产酸工程示范研究[J].环境科学研究,2020,33(12):2829-2837. |
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| 作者姓名： | 王率率 陆小游 姜谦 刘和 郑志永 刘宏波 |
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| 作者单位： | 1.江南大学环境与土木工程学院, 江苏省厌氧生物技术重点实验室, 江苏 无锡 214122 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项（No.2015ZX07306001） |
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| 摘 要： | 鉴于污泥厌氧发酵产酸技术的生产规模性研究较少，为深入了解城镇剩余污泥厌氧发酵产挥发性脂肪酸（VFAs）工程的长期运行特征，基于0.3 t/d规模的生产线平台进行了为期240 d的稳定运行研究，考察了长期运行条件下的污泥预处理效果、产酸水平、VFAs回收和经济可行性.结果表明:污泥经热-混碱预处理后溶解性有机物浓度〔ρ（SCOD），以溶解性COD计〕比原污泥提高了29倍，水解率达到56%.当ρ（TSS）（TSS为总悬浮固体）分别为30和70 g/L时，污泥预处理水解率分别为56%和59%；厌氧发酵产酸率〔以每g污泥有机物生产多少mg VFAs计，RVFAs〕分别为277和256 mg/g；ρ（TVFAs）（TVFAs为总挥发性脂肪酸）最高可达9.1 g/L，其中乙酸占61.6%.采用聚合氯化铝（PAC）和聚丙烯酰胺（PAM）联合调理能够有效提高发酵污泥的脱水性能，与对照组相比，泥饼的含水率由84.8%降至64.0%，发酵液的回收率由33.7%升至75.7%.经济效益分析表明，设置处理规模为100 t/d时，运行成本为346.6元/t，收益为451.4元/t.研究显示，城镇污水厂剩余污泥厌氧发酵产酸生产线运行稳定，能够实现较好的有机物生物转化与资源化效果，经济可行，具有显著的应用前景.
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| 关 键 词： | 剩余污泥 热-混碱预处理 碱性发酵 挥发性脂肪酸 |
| 收稿时间： | 2019/10/29 0:00:00 |
| 修稿时间： | 2020/2/24 0:00:00 |
Full-Scale Volatile Fatty Acid Production from Excess Sludge of Municipal Wastewater Treatment Plant by Anaerobic Fermentation |
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| WANG Shuaishuai,LU Xiaoyou,JIANG Qian,LIU He,ZHENG Zhiyong,LIU Hongbo.Full-Scale Volatile Fatty Acid Production from Excess Sludge of Municipal Wastewater Treatment Plant by Anaerobic Fermentation[J].Research of Environmental Sciences,2020,33(12):2829-2837. |
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| Authors: | WANG Shuaishuai LU Xiaoyou JIANG Qian LIU He ZHENG Zhiyong LIU Hongbo |
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| Affiliation: | 1.Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China2.Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Wuxi 215009, China |
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| Abstract: | Considering there are few full-scale studies on sludge anaerobic fermentation for the production of volatile fatty acids (VFAs), a production line with a scale of 0.3 t/d was investigated to clarify the long-term operating characteristics of VFAs production from municipal excess sludge anaerobic fermentation. During 240 days of stable operation, the performances of sludge pretreatment and acids production, VFAs recovery and economic feasibility were studied. The results indicated that the concentration of dissolved organic matters (calculated by soluble COD concentration, ρ(SCOD)) after thermal-mixed alkaline pretreatment increased to 29 times of that in the original sludge, and hydrolysis rate was 56%. When the sludge concentrations (ρ(TSS)) were 30 and 70 g/L, the sludge pretreatment hydrolysis rates were 56% and 59%, respectively. VFAs production rate (calculated by the amount of VFAs produced from 1.0 g sludge by anaerobic fermentation, RVFAs) was 277 and 256 mg/g, respectively, and the total VFAs concentration (ρ(TVFAs)) reached 9.1 g/L, including 61.6% acetic acid. Moreover, the dewaterability of the fermented sludge was greatly improved by polyaluminum chloride (PAC) and polyacrylamide (PAM) treatment, the water content of the sludge cake was reduced from 84.8% to 64.0%, and the recovery rate of fermentation liquid increased from 33.7% to 75.7%. Finally, economic analysis indicated that the operating cost was about 346.6 RMB/t and the return was 451.4 RMB/t when the scale was set at 100 t/d. Therefore, it indicates the production line of VFAs production from excess municipal sludge anaerobic fermentation can operate stably and performance well in bio-transformation and resource utilization of organic matters. It is economically feasible and has a significant application prospect. |
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| Keywords: | excess sludge thermal-mixed alkaline pretreatment alkaline fermentation volatile fatty acids |
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