The aim of this research is to find substitute barrier materials for natural clay from two kinds of municipal sludge: waterworks sludge(S_w) and dredging sludge(S_d). Laboratory tests were performed firstly to determi...The aim of this research is to find substitute barrier materials for natural clay from two kinds of municipal sludge: waterworks sludge(S_w) and dredging sludge(S_d). Laboratory tests were performed firstly to determine their Atterberg limits and hydraulic conductivity. Based on the results, the use of waterworks sludge was recommended. Then, shear strength tests were performed and it was found the shear resistance property of waterworks sludge is strong enough to maintain slope stability. In order to evaluate the possibility of secondary pollution, the heavy metal contents of waterworks sludge was determined and the results indicated that secondary pollution is unlikely happened. Finally, economic analysis proves that reusing waterworks sludge as barrier will reduce the lost a great for both landfill and waterworks. Based on the results, waterworks sludge was proposed to use and a further long-term simulated landfill test was suggested.展开更多
向含水率为60%的疏浚底泥中分别添加底泥质量(绝干)的1%、2%、5%的粉煤灰、生石灰、膨润土与稻壳进行微波干燥,探究这四种改良剂对底泥干燥性能及其结构、营养成分的影响。试验结果表明,微波功率为4 k W,传送速度0.64 m/min(传送频率为1...向含水率为60%的疏浚底泥中分别添加底泥质量(绝干)的1%、2%、5%的粉煤灰、生石灰、膨润土与稻壳进行微波干燥,探究这四种改良剂对底泥干燥性能及其结构、营养成分的影响。试验结果表明,微波功率为4 k W,传送速度0.64 m/min(传送频率为17.8 Hz),不通风的条件下,粉煤灰和生石灰可有效加快疏浚底泥的干燥速率,膨润土和稻壳对底泥连续化微波干燥特性影响不明显;粉煤灰、膨润土和稻壳能有效提高疏浚底泥的营养成分,降低底泥的容重,增大孔隙度,生石灰对底泥的营养成分和含盐量没有明显改善,但能够提高底泥的酸度值。试验为改良剂对疏浚底泥微波干燥性能及其作为种植土的应用提供了理论依据和技术支持。展开更多
文摘The aim of this research is to find substitute barrier materials for natural clay from two kinds of municipal sludge: waterworks sludge(S_w) and dredging sludge(S_d). Laboratory tests were performed firstly to determine their Atterberg limits and hydraulic conductivity. Based on the results, the use of waterworks sludge was recommended. Then, shear strength tests were performed and it was found the shear resistance property of waterworks sludge is strong enough to maintain slope stability. In order to evaluate the possibility of secondary pollution, the heavy metal contents of waterworks sludge was determined and the results indicated that secondary pollution is unlikely happened. Finally, economic analysis proves that reusing waterworks sludge as barrier will reduce the lost a great for both landfill and waterworks. Based on the results, waterworks sludge was proposed to use and a further long-term simulated landfill test was suggested.
文摘向含水率为60%的疏浚底泥中分别添加底泥质量(绝干)的1%、2%、5%的粉煤灰、生石灰、膨润土与稻壳进行微波干燥,探究这四种改良剂对底泥干燥性能及其结构、营养成分的影响。试验结果表明,微波功率为4 k W,传送速度0.64 m/min(传送频率为17.8 Hz),不通风的条件下,粉煤灰和生石灰可有效加快疏浚底泥的干燥速率,膨润土和稻壳对底泥连续化微波干燥特性影响不明显;粉煤灰、膨润土和稻壳能有效提高疏浚底泥的营养成分,降低底泥的容重,增大孔隙度,生石灰对底泥的营养成分和含盐量没有明显改善,但能够提高底泥的酸度值。试验为改良剂对疏浚底泥微波干燥性能及其作为种植土的应用提供了理论依据和技术支持。
