基于半焦的污泥调质与机械脱水
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摘要
采用真空抽滤脱水实验方法探讨了基于半焦的污泥调质与机械脱水的影响因素,通过污泥比阻测试、SEM,FT-IR分析揭示了基于半焦的污泥调质与机械脱水的机理。结果表明:当半焦的粒径为75·200μm,添加量为1.5 g·(100mL)~(-1)污泥时,云南褐煤在500℃下热解的半焦对污泥调质与机械脱水效果较好;经半焦调质污泥的机械脱水泥饼含水率、脱水时间、污泥比阻分别由原污泥的76.02%、124s、2.155×lO~(13)m·kg~(-1)降低至61.14%,75 s、6.943×10~(11)m·kg~(-1),半焦对污泥调质与机械脱水有显著效果;污泥机械脱水泥饼含水率与半焦质量参数(0/C、H/C、BET比表面积、孔容)呈现良好的相关关系;半焦对污泥调质与机械脱水的机理主要表现在半焦能显著改善污泥的脱水性能,消弱污泥的亲水性能以及对污泥的吸附作用。
The factors influencing sludge conditioning by the addition of semi-eoke for mechanical dewatering were explored using vacuum dehydration experiments.The mechanism behind sludge conditioning and mechanical dewatering based on semi-coke was revealed by a set of analytical techniques including the specific resistance to filtration(SRF) test,Fourier transform infrared spectroscopy(FT-IR),and scanning electron microscopy(SEM) analysis.The results show that when the particle size of semi-coke derived from the pyrolysis of Yunnan brown coal under 500 ℃ was from 75 to 200 μm and 1.5 g·(100 mL)~(-1) sludge was added,the water content decreased from 76.02% to 61.14%,the dehydration time decreased from 124 s to 75 s,and the SRF of the sludge decreased from 2.155×10~(13) m·kg~(-1) to 6.943×10~(11) m·kg~(-1).These findings proved that semi-coke has a significant effect on sludge conditioning for mechanical dewatering.There is an apparent correlation between the water content of mechanical dewatering sludge and the quality parameters of semi-coke(O/C,H/C,specific surface area,and pore volume).The mechanism could be explained by the improved dewatering performance and weakened hydrophilic properties of sludge conditioned by semi-eoke and the adsorption of sludge on the semi-coke.
The factors influencing sludge conditioning by the addition of semi-eoke for mechanical dewatering were explored using vacuum dehydration experiments.The mechanism behind sludge conditioning and mechanical dewatering based on semi-coke was revealed by a set of analytical techniques including the specific resistance to filtration(SRF) test,Fourier transform infrared spectroscopy(FT-IR),and scanning electron microscopy(SEM) analysis.The results show that when the particle size of semi-coke derived from the pyrolysis of Yunnan brown coal under 500 ℃ was from 75 to 200 μm and 1.5 g·(100 mL)~(-1) sludge was added,the water content decreased from 76.02% to 61.14%,the dehydration time decreased from 124 s to 75 s,and the SRF of the sludge decreased from 2.155×10~(13) m·kg~(-1) to 6.943×10~(11) m·kg~(-1).These findings proved that semi-coke has a significant effect on sludge conditioning for mechanical dewatering.There is an apparent correlation between the water content of mechanical dewatering sludge and the quality parameters of semi-coke(O/C,H/C,specific surface area,and pore volume).The mechanism could be explained by the improved dewatering performance and weakened hydrophilic properties of sludge conditioned by semi-eoke and the adsorption of sludge on the semi-coke.
引文
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[14]张建,侯影飞,周洪洋,等.活性半焦用于油田含油污水除油的研究[J].环境工程学报,2010,4(2):355-359
[15]马淞江,刘学鹏,戴谨泽,等.基于半焦的污泥调质与深度浓缩脱水[J].环境工程学报,2015,9(6):2991-2996
[2]袁红莉,杨金水,王风芹,等.不可再生能源物质褐煤的生物可持续发展问题展望:微生物转化与利用研究[J].世界科技研究与发展,2002,24(3):13-18
[3]董洪峰,云增杰,曹勇飞.我国褐煤的综合利用途径及前景展望[J].煤炭技术,2008,27(9):122-124
[4]杜敬文,殷甲楠,樊丽华,等.褐煤利用技术现状[J].洁净煤技术,2015,21(1):73-76
[5]薛选平,史剑鹏,胡昌兰,等.中国褐煤干馏的利用前景[J].洁净煤技术,2013,19(1):55-56
[6]刘立志,孙启明,孙勇智.内蒙古褐煤分级综合利用[J].技术经济,2012,31(11):86-89
[7]孙成功,吴家珊,李保庆.低温热改质煤表面性质变化及其对浆体流变特性的影响[J].燃料化学学报,1996,24(2):174-180
[8]张殿奎.我国褐煤综合利用的发展现状及展望[J].神华科技,2010,8(1):51-56
[9]王兆文,杜雄伟.焦炉煤气制天然气产业的发展探讨[J].煤化工,2014,42(1):7-11
[10]张晓静.中低温煤焦油加氢技术[J].煤炭学报,2011,36(5):840-844
[11]赵振新,朱书全,马名杰,等.中国褐煤的综合优化利用[J].洁净煤技术,2008,14(1):28-31
[12]马淞江,刘晓芳,戴谨泽,等.温和热解条件下内蒙褐煤热解半焦的燃烧性能[J].煤炭学报,2015,40(5):1153-1159
[13]戴财胜,刘良良,马淞江,等.褐煤热解半焦在污泥调质与深度浓缩脱水中的应用[J].煤炭学报,2014,39(7):1361-1365
[14]张建,侯影飞,周洪洋,等.活性半焦用于油田含油污水除油的研究[J].环境工程学报,2010,4(2):355-359
[15]马淞江,刘学鹏,戴谨泽,等.基于半焦的污泥调质与深度浓缩脱水[J].环境工程学报,2015,9(6):2991-2996
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