含厨余垃圾的混合污水污泥热解性能及逸出气体分析  

PYROLYSIS PERFORMANCE AND EVOLVED GAS ANALYSIS OF MIXED SEWAGE SLUDGE CONTAINING KITCHEN WASTE

作　　者：周阳[1] 金保昇[1] ZHOU Yang;JIN Baosheng(Key Laboratory of Thermal Conversion and Control of Ministry of Education,School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院能源热转换与控制教育部重点实验室,南京210096

出　　处：《环境工程》2022年第10期80-87,175,共9页Environmental Engineering

基　　金：国家重点研发计划项目(2018YFC1901200)。

摘　　要：为解决厨余垃圾进入市政管网导致的污泥处理问题,利用厨余垃圾制备初沉污泥(PS),与污水处理的残余污泥(RS)混合制备了不同厨余垃圾比例的混合污水污泥(MSS)。采用TG-FTIR评估了含厨余垃圾的混合污水污泥的热解性能及逸出气体特性。质量损失可分为3个阶段:初步脱水阶段、主要分解阶段及连续轻微分解阶段。PS含量的增加导致反应速率提高和热解特性参数CPI增加,反应时间缩短,从而提高了污水污泥的热解性能。不同温度下PS和RS之间的相互作用存在差异,低温区(<300℃)基本不存在相互作用,中温区(300~550℃)为相互促进,高温区(550~850℃)为相互抑制。FTIR主要检测出CH_(4)、CO_(2)、H_(2)O、CO、CO、SO_(2) 6种气态产物及官能团,表明CO_(2)是主要的气态产物,且随着PS含量的增加,逸出气体及官能团的产生均增加。相互作用不仅体现在质量损失过程中,也体现在产物演化过程中,PS50RS50呈现最明显的相互促进效果,可认为是最适合的比例。随着温度增加,产物普遍在500~600℃内达到最大值,可认为是最佳的热解温度。This study aimed to solve the sludge treatment issues caused by kitchen waste entering the municipal network.This study used kitchen waste to produce the primary sludge(PS),then mixed it with different amounts of residual sludge(RS) to produce the mixed sewage sludge(MSS).The pyrolysis performance and evolved gas properties of mixed sewage sludge containing food waste were evaluated by TG-FTIR.The mass loss could be divided into 3 stages:initial dehydration,major decomposition,and continuous slight decomposition.With the increase of PS proportion,the reaction rate and pyrolysis characteristic parameter(CPI) got improved,and the reaction time got reduced,thus improving the performance of sewage sludge pyrolysis.The interactions between PS and RS varied at different temperatures,the low-temperature region(<300 ℃) was almost non-interactive,the medium temperature region(300~550 ℃) was mutually promoting,and the high-temperature region(550~850 ℃) was mutually inhibiting.FTIR detected 6 main gaseous products and functional groups of CH_(4),CO_(2),H_(2)O,CO,CO and SO_(2).The results showed that the production of evolved gases and functional groups were increased with the increase of PS percentage,and CO_(2) was the main gaseous product.The interactions were not only reflected in the mass loss process but also in the product evolution process,and PS50 RS50 showed the most obvious mutual promotion effect,which could be considered as the best ratio.With the increase of temperature,the products generally reached the maximum in the range of 500~600 ℃,which can be considered as the best pyrolysis temperature.

关 键 词：热解 厨余垃圾 污水污泥 TG-FTIR 

分 类 号：X799.3[环境科学与工程—环境工程]