薄层干化机污泥干化过程能耗及污染物特性研究
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摘要
依托上海某建成的2×100 t/d薄层干化机污泥干化工程实例,分析了市政脱水污泥粒径分布规律,污泥粒径对干化过程的影响,干化过程中干污泥含水率与能耗的关系,以及废水、废气排放特性。结果表明:污泥干化至含水率约为30%,有利于干化系统的节能、稳定运行及干污泥的协同处置,恶臭气体的厂界浓度满足GB14554—1993恶臭污染物排放标准的规定,而干化过程产生的废水、废气需经过相应的处理后才能达标排放。
According to an engineering practice in a thin film evaporator in which dried sludge with 2 ×100 t/d in Shanghai,the regulation of particle size distribution of dewatered sludge was analyzed,its effects and the energy consumption for different moisture content of dried sludge and emission characteristics of effluent and exhaust gas during drying process were analyzed. The results showed that the dried sludge with 30% moisture content was conducive to the drying system energy saving,stable operation and collaborative disposal of dry sludge. The boundary concentration of odor gas met the requests of Emission Standards for Odor Pollutants(GB 14554—1993),while the effluent and exhaust gas produced in the drying process could only be discharged after corresponding treatment.
According to an engineering practice in a thin film evaporator in which dried sludge with 2 ×100 t/d in Shanghai,the regulation of particle size distribution of dewatered sludge was analyzed,its effects and the energy consumption for different moisture content of dried sludge and emission characteristics of effluent and exhaust gas during drying process were analyzed. The results showed that the dried sludge with 30% moisture content was conducive to the drying system energy saving,stable operation and collaborative disposal of dry sludge. The boundary concentration of odor gas met the requests of Emission Standards for Odor Pollutants(GB 14554—1993),while the effluent and exhaust gas produced in the drying process could only be discharged after corresponding treatment.
引文
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[2] Lombardi L,Carnevale E,Corti A. A review of technologies and performances of thermal treatment systems for energy recovery from waste[J]. Waste Manage,2015,37:26-44.
[3]刘念汝,王光华,李文兵,等.城市污泥微波干化及污染物析出特性研究[J].工业安全与环保,2016,42(7):80-83.
[4]王罗春,李雄,赵由才.污泥干化与焚烧技术[M].北京:冶金工业出版社,2010.
[5]李家祥,贺阳,范跃华. 4种污泥干化技术及设备的比较与展望[J].中国市政工程,2013(1):80-84.
[6] Bennamoun L. Solar drying of wastewater sludge:A review[J].Renew Sust Energ Rev,2012,16(1):1061-1073.
[7]王明根,方跃飞,袁福平,等.利用太阳能和高温热泵的城市污泥热干化系统技术研究[J].干燥技术与设备,2007,5(6):311-314.
[8]魏砾宏,张雄,李润东,等.脱水污泥颗粒等温干燥特性实验研究[J].环境科学学报,2012,32(7):1631-1636.
[9]李安峰,骆坚平,黄丹,等.污泥干化冷凝水水质特征分析[J].环境工程学报,2015,9(1):253-256.
[10]翁焕新,章金骏,刘瓉,等.污泥干化过程氨的释放与控制[J].中国环境科学,2011,31(7):1171-1177.
[11] Gomezrico M F,Fullana A,Font R,et al. Volatile organic compounds released from thermal drying of sewage sludge[J]. Wit Trans Ecol Environ,2008,111:425-433.
[12]邹道安,黄瑾,白海龙,等.污泥热干化和燃烧特性试验研究[J].环境污染与防治,2012,34(4):5-10.