为了探索市政生活污水处理厂剩余活性污泥资源化方式,以市政污泥为原料,采用热解法制备污泥基生物炭(SBC),探究SBC最佳制备条件以及对多环芳烃萘的吸附影响因素。结果表明:SBC的最佳制备条件为污泥粒径0.25mm,升温速率2.5℃/min,热解温度800℃,停留时间1h,在该条件下市政污泥的产炭率、产油率和产气率分别为61.36%、15.55%和23.09%;SBC对萘的最佳吸附条件为转速200r/min,温度35℃,投加量0.4g,在该条件下萘的去除率可达85.06%;SBC对萘的吸附过程符合准二级动力学模型,Langmuir等温吸附模型可以更好地描述SBC对萘的吸附。扫描电子显微镜和BET比表面积分析表明,SBC表面粗糙,具有丰富的孔隙结构,能有效吸附废水中的萘。
In order to explore the resource utilization mode of surplus activated sludge from municipal sewage treatment plants,sludge-based biochar (SBC) was prepared by pyrolysis method with municipal sludge as raw material,and the optimal preparation conditions of SBC and the factors influencing the adsorption of polycyclic aromatic naphthalene were explored.The results showed that the optimal preparation conditions of SBC were sludge particle size of 0.25mm,heating rate of 2.5℃/min,pyrolysis temperature of 800℃ and residence time of 1h.Under these conditions,the carbon production rate,oil production rate and gas production rate of municipal sludge were 61.36%,15.55% and 23.09%,respectively.The optimal adsorption conditions for naphthalene by SBC were as follows:rotational speed of 200r/min,temperature of 35℃ and dosage of 0.4g.Under these conditions,the removal rate of naphthalene could reach 85.06%.The adsorption process of SBC on naphthalene conformed to quasi-second-order adsorption kinetics,and Langmuir isothermal adsorption model could better describe the adsorption of SBC on naphthalene.SEM and BET analysis revealed that SBC had rough surface and abundant pore structure,which could effectively adsorb naphthalene in wastewater.
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基金资助
辽宁省“兴辽英才计划”项目(XLYC2007007)
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