摘要
为探究市政污泥与牛粪协同炭化对改性污泥生物炭性质的影响,以市政污泥和牛粪为实验原料,设置牛粪添加比例为0%、10%、20%、50%,炭化时间为40 min,炭化温度为400℃、500℃、700℃,将市政污泥与牛粪协同炭化,分析制备的改性污泥生物炭的性质。结果表明,改性污泥生物炭的产率随着炭化温度的升高及牛粪添加比例的增加而降低。在炭化温度为700℃,牛粪添加比例为50%时,产率最大降幅为34.09%;改性污泥生物炭的有机质含量随着牛粪添加比例的增加而升高,随着炭化温度的升高而降低;当牛粪的添加比例为50%时,改性污泥生物炭的有机质含量最高,分别为35.49%(700℃)、43.09%(600℃)和46.15%(500℃)。改性污泥生物炭中的重金属富集程度随着炭化温度的升高而提高。改性污泥生物炭中有效态重金属占比在20%以下,表明市政污泥与牛粪共热解对重金属形态稳定化具有一定的协同作用,降低了重金属淋溶风险和生态毒性。
In order to explore the effect of municipal sludge and cow dung co carbonization on the properties of modified sludge biochar,municipal sludge and cow dung were used as experimental materials,and the cow dung addition ratio was 0%,10%,20%,50%,carbonization time was 40 min,carbonization temperature was 400℃,500℃,700℃.Municipal sludge and cow dung were co carbonized,and the properties of the prepared modified sludge biochar were analyzed.The re⁃sults showed that the yield of modified sludge biochar decreased with the increase of carbonization temperature and the pro⁃portion of cow dung.When the carbonization temperature is 700℃and the proportion of cow manure added is 50%,the maximum decrease in yield is 34.09%.The organic matter content of modified sludge biochar increased with the increase of cow dung addition ratio,and decreased with the increase of carbonization temperature.When 50%cow dung was added,the organic matter content of modified sludge biochar was the highest,which was 35.49%(700℃),43.09%(600℃)and 46.15%(500℃),respectively.The concentration of heavy metals in modified sludge biochar increased with the increase of carbonization temperature.The effective heavy metals in the modified sludge biochar account for less than 20%,indicating that the co pyrolysis of municipal sludge and cow dung has a certain synergistic effect on the stability of heavy metal forms,reducing the risk of heavy metal leaching and ecological toxicity.
作者
刘程
徐汝民
汪军
陈涛
LIU Cheng;XU Ru-min;WANG Jun;CHEN Tao(Anhui Tongyuan Environmental Energy Conservation Co.Ltd.,Hefei 230031,China;Anhui Municipal Sludge Disposal and Resource Utilization Engineering Research Center,Hefei 230031,China)
出处
《安徽化工》
CAS
2024年第2期135-139,144,共6页
Anhui Chemical Industry
关键词
市政污泥
牛粪
改性污泥生物炭
协同炭化
重金属
municipal sludge
cow manure
modified sludge biochar
collaborative carbonization
heavy metal
