摘要研究采用市政污水处理厂剩余污泥进行厌氧消化,在系统稳定后取发酵后污泥残渣制备生物炭,研究其对水体污染物NH4+及PO43-的吸附性能。通过测定pH、zeta电位对生物炭的性质进行了分析。静态吸附实验表明,相比于其他条件,600 ℃条件下制备的生物炭(DBC-600)对NH4+及PO43-有较好的吸附效果。吸附动力学研究表明伪二级动力学模型与实验具有较好的相关性,对于NH4+及PO43-的相关系数分别为0.9992和0.9989,表明此过程是以化学反应为主导的吸附过程。通过SEM-EDS对比分析DBC-600与空白组的形貌及生物炭成分,进一步推断主要的吸附机理。27171
关键词 生物炭 剩余污泥 厌氧消化 热解 吸附
毕业论文设计说明书外文摘要
Title Study on preparetion of digested sludge residual-based biochar and its application for adsorption
Abstract
In this study, the anaerobic digestion of waste activated sludge (WAS) produced from municipal wastewater treatment plant was investigated. Biochar was then prepared from anaerobically digested sludge through pyrolysis at 400,500 and 600 ℃ for the adsorption of NH4+ and PO43-. pH and zeta potential were analyzed to evaluate the performance of biochar. The experimental data shown that the biochar produced at 600 ℃ (DBC-600) had an better adsorption properties for NH4+ and PO43- compared with other conditions. The result of kinetics indicated that the experimental data agreed better with the pseudo-second order model due to its relatively high R2 value (0.9992 and 0.9989, respectively), it indicated that the chemical reaction is dominant in this adsorption; The analysis results of SEM-EDS revealed the adsorption mechanism of NH4+ and PO43-.
Keywords biochar waste activated sludge anaerobic digestion pyrolysis adsorption
目录
1 绪论 1
1.1 研究背景 1
1.1.1 剩余活性污泥简介 1
1.1.2 剩余活性污泥的处置目的 1
1.1.3 剩余污泥的处理与处置 2
1.1.4 剩余污泥的资源化利用 2
1.2 污泥厌氧消化技术原理及影响因素 3
1.2.1 厌氧消化技术原理 3
1.2.2 影响污泥厌氧消化作用的主要因素 3
1.3 生物炭的制备与应用 5
1.3.1 生物炭的性质 5
1.3.2 生物炭的制备 5
1.3.3 生物炭的应用 6
1.4 课题研究内容 6
2 实验过程 7
2.1 实验材料 7
2.1.1 实验用泥 7
2.1.2 实验药剂 7
2.1.3 实验仪器与设备 7
2.2 实验操作 8
2.2.1 污泥厌氧消化系统的构建与稳定 8
2.3 测定项目与分析方法 9
2.3.1可溶性化学需氧量(SCOD)的测定 9
2.3.2 NH4+的测定 9
2.3.3 PO43-的测定 9
2.3.4 可溶性蛋白质的测定 9
2.3.5 可溶性糖的测定 9
2.4 生物炭的制备及生物炭的吸附性能实验 9
2.4.1生物炭的制备 9
2.4.2生物炭的吸附性能测试 10
3 结果和讨论 11
3.1 污泥厌氧消化过程COD的变化情况 11
3.2 活性炭的pH及Zeta电位 12
3.3 不同条件生物炭的吸附性能 13
3.4 生物炭的吸附动力学研究 14
3.5 生物炭吸附机理探究 15 污泥质生物炭的制备及其吸附性能研究:http://www.youerw.com/huaxue/lunwen_21592.html