药剂联合高温对低有机质污泥水解促进研究  

Effects of Chemical Agent Combined with High Temperature on Hydrolysis of Sludge with Low Organic Content

作　　者：江丽华 卓桂华 陈细妹 林鸿 刘常青[6] 甄广印 郑育毅[1,2] JIANG Li-hua;ZHUO Gui-hua;CHEN Xi-mei;LIN Hong;LIU Chang-qing;ZHEN Guang-yin;ZHENG Yu-yi(Fujian Key Laboratory of Pollution Control and Resource Reuse,College of Environmental and Resource Sciences and College of Carbon Neutral Modern Industry,Fujian Normal University,Fuzhou 350007,China;Fujian College and University Engineering Research Center for MunicipalWaste Resourcization and Management,Fuzhou 350007,China;Fyjian Academy of Environmental Sciences,Fuzhou 350013,China;Fuzhou Zhongchenghe Renewable Resources Utilication Co.Ltd,Fuzhou 350011,China;Fujian Jinhuang Enironmental Sci-Tech Co.Ld,Fuzhou 350002,China;School of Geographical Sciences and School of Carbon Neutrality Future Technology,Fujian Normal University,Fuzhou 350007,China;School of Ecological and Environmental Science,East China Normal University,Shanghai 200241,China)

机构地区：[1]福建师范大学环境与资源学院碳中和现代产业学院福建省污染控制与资源循环利用重点实验室,福建福州350007 [2]城市废物资源化技术与管理福建省高校工程研究中心,福建福州350007 [3]福建省环境科学研究院,福建福州350013 [4]福州中城科再生资源利用有限公司,福建福州350011 [5]福建省金皇环保科技有限公司,福建福州350002 [6]福建师范大学地理科学学院碳中和未来技术学院,福建福州350007 [7]华东师范大学生态与环境科学学院,上海200241

出　　处：《中国给水排水》2022年第19期86-92,共7页China Water & Wastewater

基　　金：福建省科技厅对外合作项目(2021I0010);福建省科技厅计划项目(2020N5015);福建省科技厅公益类项目(2019R1015-1)。

摘　　要：厌氧消化是实现污泥稳定和能源回收的主要途径之一。我国南方地区污水处理厂广泛采用生物营养物去除工艺,普遍存在进水有机物含量低的问题,导致污泥有机质含量也偏低(VS/TS<0.6)。针对南方典型低有机质污泥,在120℃、0.5 h条件下分别投加NaOH、Ca(OH)_(2)和CaCl_(2)进行联合高温热水解预处理后,进行中温厌氧消化。结果表明,投加药剂联合高温热水解促进了溶解性有机碳(SOC)、可溶糖、可溶性蛋白质的溶出,进而提高了累积产甲烷量。在高温热水解预处理过程中,药剂对有机物的溶出效果为NaOH>Ca(OH)_(2)>CaCl_(2)。在后续厌氧消化过程中,由于CaCl_(2)可提高SCOD中碳水化合物占比,投加CaCl_(2)联合高温热水解后总化学需氧量(TCOD)和总糖降解效果明显,TCOD降解量为25326 mg/L且总糖降解量在TCOD降解量中占比最高(87.7%),因而3种药剂中CaCl_(2)的累积产甲烷量最高(183.1 mL/gVS)。CaCl_(2)联合高温热水解预处理较NaOH、Ca(OH)_(2)更能提高低有机质污泥的厌氧产沼性能。Anaerobic digestion is one of the main strategies to facilitate sludge stabilization and energy recovery. The biological nutrient removal process is widely applied in wastewater treatment plants in southern China, and the widespread low content of influent organic matter results in the low content of sludge organic matter(VS/TS < 0.6). In this paper, the typical sludge with low organic content in southern China was first pretreated with chemical agents including NaOH, Ca(OH)_(2)and CaCl_(2)combined with thermophilic hydrolysis at 120 ℃ for 0.5 h. Then, the sludge was used as the substrate for mesophilic anaerobic digestion. The addition of chemical agents combined with thermophilic hydrolysis promoted the release of soluble organic carbon(SOC), soluble sugar and soluble protein, and increased the cumulative methane production. In the process of thermophilic hydrolysis pretreatment, the efficiency of chemical agents for dissolution of organic matters in descending order was NaOH, Ca(OH)_(2)and CaCl_(2). In the subsequent anaerobic digestion process, since CaCl_(2)promoted the proportion of carbohydrates in SCOD,the degradation efficiencies of total chemical oxygen demand(TCOD) and total sugar were obviously improved after dosing CaCl_(2)combined with thermophilic hydrolysis. The degradation of TCOD was25 326 mg/L, and the degradation of total sugar accounted for the highest proportion of the degraded TCOD(87.7%), so the cumulative methane production of CaCl_(2)among the three agents was the highest(183.1 mL/gVS). The addition of CaCl_(2)combined with thermophilic hydrolysis pretreatment was more effective to enhance the anaerobic biogas production performance of low organic sludge than NaOH and Ca(OH)_(2).

关 键 词：低有机质污泥 高温热水解 联合预处理 厌氧消化 有机物溶出 

分 类 号：TU992[建筑科学—市政工程]