山地城市污泥水热炭化产物特性研究  

Characteristics of Hydrothermal Carbonization Products of Municipal Sludge in Mountainous Cities

作　　者：许劲[1,2] 范准 吕秋颖 唐琦[1,2] 李杨 李遥瑶[1,2] 方俊华 XU Jin;FAN Zhun;Lü Qiu-ying;TANG Qi;LI Yang;LI Yao-yao;FANG Jun-hua(College of Environment and Ecology,Chongqing University,Chongqing 400045,China;Key Laboratory of Three Reservoir Region’s Eco-Environment,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学环境与生态学院,重庆400045 [2]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《中国给水排水》2020年第21期21-27,34,共8页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07401001-02)。

摘　　要：以山地城市污水处理厂未添加化学调理剂的浓缩污泥为原料,通过设置200、220、240、260℃这4个反应温度和2、4、6 h这3个反应时间共12组实验,探究反应温度和反应时间对污泥水热炭化固相和液相产物的影响。结果表明,随着反应温度和时间的增加,污泥水热炭产率从69.32%(200℃-2 h)降至59.49%(260℃-6 h),同时水热炭中的官能团O—H、C—H和C=C逐渐降解,H/C值和O/C值(物质的量之比)减小,水热炭的脱羧和芳构化反应增强。整体而言,升高反应温度比延长反应时间对污泥水热炭化的影响更大。BMP(产甲烷潜力)实验表明,随着反应温度的升高,液相产物中难降解有机物含量增加,而且其中的苯酚和呋喃衍生物等复杂有机物对厌氧反应具有抑制作用,累积甲烷产量随之降低。随着反应温度和时间的增加,C含量呈上升趋势,而H、O和N含量反之,水热炭的高位热值(HHV)、能量密度和能量产率均低于污泥原料。污泥的高含砂量对水热炭的元素含量和热值影响显著,建议对污泥含砂量进行有效控制。Effects of reaction temperature and time on solid and liquid hydrothermal carbonization products of the concentrated sludge without adding chemical conditioner in a wastewater treatment plant of a mountainous city were investigated.Twelve groups of experiments were set up by setting four reaction temperatures(200℃,220℃,240℃and 260℃)and three reaction times(2 h,4 h and 6 h).With the increase of reaction temperature and time,the yield of sludge-based hydrothermal charcoal decreased from 69.32%(200℃and 2 h)to 59.49%(260℃and 6 h),the functional groups of O—H,C—H and C=C were gradually degraded,H/C value and O/C value decreased,and the decarboxylation and aromatization reactions of hydrothermal charcoal were enhanced.Overall,increasing reaction temperature had a greater impact on hydrothermal carbonization of sludge than extending reaction time.Biochemical methane potential(BMP)experiments indicated that the content of refractory organics in liquid products increased with the increase of reaction temperature,complex organics such as phenol and furan derivatives inhibited the anaerobic reaction,and the cumulative methane production decreased accordingly.With the increase of reaction temperature and time,the carbon content showed an upward trend,while the contents of hydrogen,oxygen,and nitrogen decreased,and the high heat value(HHV),energy density,and energy yield of hydrothermal charcoal were all lower than those of the raw sludge.The high sand content of sludge had a significant influence on the element content and HHV of hydrothermal charcoal.It was suggested to control the sand content of sludge effectively.

关 键 词：山地城市 污泥 含砂量 水热炭化 反应时间 反应温度 

分 类 号：TU992[建筑科学—市政工程]