超声联合热碱预处理促进剩余污泥中温厌氧消化研究

doi:10.19741/j.issn.1673-4831.2018.0056

生态与农村环境学报 ›› 2019, Vol. 35 ›› Issue (1): 91-97.doi: 10.19741/j.issn.1673-4831.2018.0056

超声联合热碱预处理促进剩余污泥中温厌氧消化研究

徐慧敏^1,2, 秦卫华¹, 李中林¹, 顾琪¹, 戴晓虎^3,4

1. 生态环境部南京环境科学研究所, 江苏南京 210042;
2. 南京国环环境研究院有限公司, 江苏南京 210042;
3. 同济大学城市污染控制国家工程研究中心, 上海 200092;
4. 同济大学环境科学与工程学院, 上海 200092

收稿日期:2018-02-02 出版日期:2019-01-25 发布日期:2019-01-22
通讯作者: 秦卫华 E-mail:qinweihua2002@sina.com
作者简介:徐慧敏(1989-),女,江苏泰州人,助理研究员,博士,主要从事污泥资源化利用方向研究。E-mail:huimin0905@163.com
基金资助:
国家高技术研究发展计划（2012AA063602）

Upgrading Semi-Continuous Mesophilic Anaerobic Digestion of Waste Activated Sludge by Combined Ultrasonic, Thermo-Alkaline Pretreatment

XU Hui-min^1,2, QIN Wei-hua¹, LI Zhong-lin¹, GU Qi¹, DAI Xiao-hu^3,4

1. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China;
2. Nanjing Guohuan Institute of Environmental Research Co. Ltd., Nanjing 210042, China;
3. National Engineering Research Center for Urban Pollution Control, Shanghai 200092, China;
4. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

Received:2018-02-02 Online:2019-01-25 Published:2019-01-22
Contact: 35 E-mail:qinweihua2002@sina.com

摘要/Abstract

摘要：

基于超声联合热碱破解污泥最佳工艺参数，对预处理污泥进行半连续式中温厌氧消化研究。结果表明，预处理污泥日产甲烷量是原泥的1.94倍，达234 mL·d^-1。运用修正的冈珀兹模型进行累计甲烷产量动力学分析，发现预处理污泥和原泥累计产甲烷曲线与修正的冈珀兹模型拟合系数R²分别达0.998和0.993。预处理污泥的动力学参数如下：最大累计产气量达5 376.4 mL，最大产甲烷速率达394.8 mL·d^-1，细菌产甲烷的延迟时间为2.8 d。预处理污泥的甲烷转化率为82.17%。从有机物浓度变化来看，厌氧消化期间预处理污泥溶解性化学需氧量、溶解性蛋白质和多糖浓度均远高于原泥，最大值分别是原泥的2.09、3.94和3.95倍。预处理污泥在预处理阶段和厌氧消化阶段的总悬浮物和挥发性悬浮物去除率分别达54.9%和61.8%。超声联合热碱预处理不仅能促进污泥有机质破解，还能提高破解有机质的生物可利用性，极大改善污泥厌氧消化效率。

关键词: 超声联合热碱, 中温厌氧消化, 修正的冈珀兹模型, 溶解性有机质, 挥发性悬浮物(VSS)去除率

Abstract:

Semi-continuous mesophilic anaerobic digestion assays were performed to assess the influence of combined ultrasonic, thermo-alkaline pretreatment on biodegradability of waste activated sludge (WAS). The pretreated WAS was obtained at optimal conditions of temperature 73℃, alkaline dosage 0.085 g·g^-1 total solids (TS) and specific energy 9 551 kJ·kg^-1 TS. During anaerobic digestion, the average daily methane production of pretreated WAS was as high as 234 mL, which was 1.94 times that of untreated WAS. Furthermore, modified-Gompertz model was introduced to predict the methane production and evaluate the kinetic parameters. The modified-Gompertz models (R²:0.998 and 0.993 for pretreated and untreated WAS, respectively) show good fit to the experimental results. For pretreated WAS, kinetic constants of methane production model using modified-Gompertz were P (methane production potential, 5 376.4 mL), R_m (maximum methane production rate, 394.8 mL·d^-1), λ (minimum time to produce methane, 2.8 days). Besides, the ratio of methane conversion of pretreated WAS achieved at 82.17%. During anaerobic digestion, concentrations of soluble chemical oxygen demand (SCOD), soluble protein (SP), and soluble carbohydrates (SC) of pretreated WAS were much higher than that of the untreated WAS. Therefore, the reductions of total suspended solids (TSS) and volatile suspended solids (VSS) were 54.9% and 61.8% for pretreated WAS after pretreatment and anaerobic digestion. Based on results obtained above, it is suggested that combined ultrasonic, thermo-alkaline pretreatment improves sludge disintegration as well as increases biodegradability, resulting to anaerobic digestion enhancement.

Key words: combined ultrasonic, thermo-alkaline pretreatment, mesophilic anaerobic digestion, modified-Gompertz model, soluble organic matters, reduction of volatile suspended solids

中图分类号:

X705

徐慧敏, 秦卫华, 李中林, 顾琪, 戴晓虎. 超声联合热碱预处理促进剩余污泥中温厌氧消化研究[J]. 生态与农村环境学报, 2019, 35(1): 91-97.

XU Hui-min, QIN Wei-hua, LI Zhong-lin, GU Qi, DAI Xiao-hu. Upgrading Semi-Continuous Mesophilic Anaerobic Digestion of Waste Activated Sludge by Combined Ultrasonic, Thermo-Alkaline Pretreatment[J]. Journal of Ecology and Rural Environment, 2019, 35(1): 91-97.

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超声联合热碱预处理促进剩余污泥中温厌氧消化研究

Upgrading Semi-Continuous Mesophilic Anaerobic Digestion of Waste Activated Sludge by Combined Ultrasonic, Thermo-Alkaline Pretreatment

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