污水处理工艺对污泥热处理特性的影响(英文)

Effect of wastewater treatment processes on thermal treatment properties of sewage sludge

通过10℃/min时的热重分析,对五种不同性质污泥分别在氮气和氧气气氛下的热解和燃烧特性进行了研究。结果表明,污水处理工艺的"好氧+厌氧"、"厌氧+好氧"过程以及污泥的厌氧消化均使污泥中的有机物结构复杂,导致污泥热解时有机物的分解和析出温度升高,且"好氧+厌氧"过程使污泥中有机物结构更复杂;而对污泥的燃烧过程和燃尽点无影响,但使着火温度升高。利用atava-est偄k方程对污泥热解、燃烧的反应机理进行了研究。结果表明,五种污泥热解时均呈现为挥发分扩散和随后的化学反应机理函数,而燃烧时则为化学反应和随后的扩散过程。

The properties of pyrolysis and combustion for five different sewage sludges are studied by thermal gravimetric analysis at a heating rate of 10℃/min in the atomosphere of nitrogen and oxygen, respectively. The results show that both of the ＂anaerobic＂ wastewater treatment and the sludge anaerobic digestion make the organic compounds in sludge so complicated that the organic compounds decomposition and release temperature becomes higher during pyrolyzing, and the ＂aerobic ＋ anaerobic＂ process makes the organic compounds in sludge more complicated than the ＂anaerobic ＋ aerobic＂ process. There is no influence on the combustion process and the burnout point, but can make the combustion temperature of sludge higher. The thermal reaction mechanisms have been studied with Satava-Sestak equation. It shows that the pyrolysis mechanism of these sludges is a process of volatile diffusion at first and then the chemical reaction function, while the combustion mechanism of them is a process of chemical reaction and diffusion function.