Effects of reaction conditions on the emission behaviors of arsenic, cadmium and lead during sewage sludge pyrolysis

• 出版年: Bioresource Technology
• 第一著者: 2-s2.0-85017095242
• フォーマット: 論文
• 言語: English
• 出版事項: Elsevier Ltd 2017
• オンライン･アクセス: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85017095242&doi=10.1016%2fj.biortech.2017.03.112&partnerID=40&md5=338fa8104c32d415fc1b28d9111c6efe

Sewage sludge is an important class of bioresources whose energy content could be exploited using pyrolysis technology. However, some harmful trace elements in sewage sludge can escape easily to the gas phase during pyrolysis, increasing the potential of carcinogenic material emissions to the atmosphere. This study investigates emission characteristics of arsenic, cadmium and lead under different pyrolysis conditions for three different sewage sludge samples. The increased temperature (within 723–1123 K) significantly promoted the cadmium and lead emissions, but its influence on arsenic emission was not pronounced. The releasing rate order of the three trace elements is volatile arsenic compounds > cadmium > lead in the beginning of pyrolysis. Fast heating rates promoted the emission of trace elements for the sludge containing the highest amount of ash, but exhibited an opposite effect for other studied samples. Overall, the high ash sludge released the least trace elements almost under all reaction conditions. © 2017 Elsevier Ltd