| 生活垃圾焚烧飞灰固化体力学及重金属浸出特性 |
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| 引用本文： | 姜钰,周宸宇,张军,王瑜堂,王敦球.生活垃圾焚烧飞灰固化体力学及重金属浸出特性[J].环境工程,2017,35(4):115-119. |
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| 作者姓名： | 姜钰 周宸宇 张军 王瑜堂 王敦球 |
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| 作者单位： | 桂林理工大学 环境科学与工程学院,广西 桂林 541004;广西环境污染控制理论与技术重点实验室,广西 桂林 541004;桂林理工大学 岩溶地区水污染控制与用水安全保障协同创新中心,广西 桂林 541004 |
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| 基金项目： | 广西“八桂学者”建设工程专项经费资助，广西自然科学基金项目，广西科学研究与技术开发计划项目 |
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| 摘 要： | 以苏州七子山生活垃圾焚烧厂产生的飞灰为研究对象,采用水泥作为固化剂,研究水泥飞灰固化体的应力应变特征及重金属浸出特性,并探讨了水泥飞灰配合比、养护时间等关键性因素对这些特性的影响。实验结果表明:较养护3 d的样品,其余养护时间的样品强度平均增长了约96.2%,而其破坏应变平均减小了56%。随着水泥含量和养护时间的增加,飞灰固化体的强度上升,而其破坏应变减小,该趋势主要归因于钙矾石(AFt)的形成促进了飞灰固化体强度的发展。较飞灰原样,飞灰固化体的重金属浸出浓度随着水泥含量、养护时间的增加而降低了38%~99%,重金属的迁移被限制,主要归因于水化硅酸钙(C—S—H)和钙矾石(AFt)的形成,以及飞灰和水泥水化反应创造的强碱性环境。
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| 关 键 词： | 木薯渣 污泥 厌氧发酵 物料比 沼气 |
EFFECT OF MIXING RATIO ON BIOGAS PRODUCED BY DRY ANAEROBIC CO-DIGESTION OF CASSAVA DREGS AND SEWAGE SLUDGE |
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| Abstract: | Dry anaerobic fermentation of solid organic waste technology has advantages of high methane yield,low operating costs and no biogas fluid processing,but there are few reports of dry anaerobic digestion using cassava dregs as the raw materials.In this study,a 0.5 liter bioreator ran for 42 d to investigate the effect of total solid (15％,20％) and mixing ratio (0,10％,20％,40％,100％) on biogas production process of dry anaerobic co-digestion of cassava dregs and sewage sludge.The results showed that:The daily gas production of TS 20％ was higher than that of TS 15％;with the increase of the proportion of cassava dregs,the specific methane production yields (SMP) based on cassava dregs increased and then gradually decreased;the highest methane contents of TS 15％ and TS 20％ were 56.14％ and 65.86％,respectively;the optimum mixing ratio range of TS 15％ was 20％ ～ 40％ and SMP were 0.245,0.318,0.303,0.097 m3/kg(VS);the optimum mixing ratio range of TS 20％ was 10％ ～ 40％ and SMP were 0.334,0.434,0.329,0.271 m3/kg(VS). |
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| Keywords: | cassava dregs sewage sludge anaerobic digestion mixing ratio biogas production |
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