垃圾淋滤液胶体在含水介质中迁移-滞留规律  

Migration-Retention Law of Landfill Leachate Colloid in Water-bearing Media

作　　者：康旭[1,2] 李海明[1,2] 李娜[1,2] 夏雪桐[1,2] 张荣海[1,2] 

机构地区：[1]天津科技大学滨海地下利用与保护研究室,天津300457 [2]天津市海洋资源与化学重点实验室,天津300457

出　　处：《环境科学与技术》2016年第2期87-91,127,共6页Environmental Science & Technology

基　　金：国家自然科学基金项目:垃圾污染场地胶体吸附态铵在含水介质中迁移-滞留的机理研究(41372231);滨海地下咸水储能回灌含水层渗透性变化的机理研究(40872156)

摘　　要：运用室内砂柱试验,研究垃圾淋滤液通过含水介质时胶体浓度的变化规律,胶体在砂柱不同位置的滞留情况以及含水介质对胶体的阻滞作用。研究发现,胶体相对浓度随时间变化趋势大致为＂S＂型,直至试验结束也并未完全穿透;沿水流方向,距进水口越远胶体迁移速率越小,含水介质对胶体的阻滞作用越大。在进水口0~60 cm之内胶体的突破时间稍稍早于示踪剂,其迁移速率略大于示踪剂;而60~100 cm之间胶体的突破时间稍稍晚于示踪剂,胶体的迁移速率小于示踪剂;60 cm处二者正好相等。垃圾淋滤液胶体在砂柱中不同位置滞留情况不同,在距进水口0~20 cm内,胶体累积滞留量随时间不断增加,累计滞留量最多;距进水口20~40 cm、40~60 cm段累计滞留量随时间先增多后减少;60~80 cm、80~100 cm段累计滞留量随时间增加到一定程度后趋于稳定。The indoor sand column test was applied to study the changing law of colloid concentration in landfill leachate,colloid retention at different locations of sand column, and the retarding action of water-bearing media working on colloid,when landfill leachate passed through water-bearing media. The study found that, the changing pattern of colloid relative concentration with time was roughly shown as ＇S＇ curve, and colloid did not fully penetrate the medium until the end of the test. Along the flow direction, the moving speed of colloid decreased with the distance from inlet, and the retarding action of water-bearing media working on colloid increased. Within the distance of 0~60 cm from inlet, breakthrough time earlier than that of tracer, and colloid migration rate was greater than the tracer migration rate; within the distance of 60 ~100 cm from inlet, the breakthrough time of colloid later than that of tracer, and colloid migration rate was less than that of tracer; and at the distance of 60 cm from inlet, the breakthrough time of colloid and colloid migration rate were equal with those of tracer.The retention of colloid varied at different locations in sand column. Within the distance of 0 ~20 cm from inlet, the cumulative retention amount of colloid increased with time, and the amount was the most; within the distances of 20~40 cm and 40~60 cm from inlet, the cumulative retention amount of colloid firstly increased but then decreased with time; within the distances of 60~80 cm and 80~100 cm from inlet, the cumulative retention amount of colloid firstly increased and then tended to be steady with time.

关 键 词：垃圾淋滤液 胶体 迁移-滞留 

分 类 号：X132[环境科学与工程—环境科学]