title: Investigation of the effects of temperature and sludge characteristics on odors and VOC emissions during the drying process of sewage sludge.
abstract: Sludge drying is a necessary step for sludge disposal. In this study, sludge was collected from two wastewater treatment plants, and dried at different temperatures in the laboratory. The emission of odor and total volatile organic compounds (TVOCs) during the sludge drying process were determined by an online odor monitoring system. The volatile organic compounds (VOCs) in off-gas were analyzed by gas chromatography-mass spectrometry. Results showed that sludge with 30% moisture content could be obtained in 51 minutes under drying temperature 100 °C but only within 27 minutes under 150 °C. Concentration of odor, TVOCs, sulfur-containing compounds (SCCs), and amines were changed with drying temperature and sludge sources. The maximum concentration of odor, TVOCs, SCCs, and amines were 503.13 ppm, 3.01 ppm, 8.15 ppm, and 11.27 ppm, respectively, at drying temperature 100 °C. These values reached 1,250.79, 8.10, 53.51, and 37.80 ppm when sludge dried at 150 °C. Odor concentration had a close relationship with emission of SCCs, amines, and TVOCs. The main VOCs released were benzene series and organic acid. Potential migration of substances in sludge was examined via analysis of off-gas and condensate, aiming to provide scientific data for effective sludge treatment and off-gas control.
authors.affiliation: Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China E-mail: leel@rcees.ac.cn.
authors.forename: Wenjie
authors.initials: W
authors.lastname: Ding
authors.affiliation: Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China E-mail: leel@rcees.ac.cn.
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China E-mail: leel@rcees.ac.cn.
authors.forename: Junxin
authors.initials: J
authors.lastname: Liu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000588:Amines / Q000032:analysis*; D003890:Desiccation; D008401:Gas Chromatography-Mass Spectrometry; D009812:Odorants / Q000032:analysis*; D012722:Sewage / Q000032:analysis*; D013457:Sulfur Compounds / Q000032:analysis*; D013696:Temperature; D055549:Volatile Organic Compounds / Q000032:analysis*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000032:analysis
chemical_list: D000393:Air Pollutants; D000588:Amines; D012722:Sewage; D013457:Sulfur Compounds; D055549:Volatile Organic Compounds; D062065:Wastewater