摘要
在不同工况条件下开展了建筑垃圾中典型污染物浸出毒性试验、扩散试验和批式吸附试验,以评价建筑垃圾用在海绵城市填筑体时对储水质量可能产生的影响。浸出试验结果表明,在标准浸出条件下,不同取样点的建筑垃圾再生骨料浸出毒性差别不大;在强化浸出条件下,铁路附近所采集的建筑垃圾Cr浸出浓度超过地表水环境质量标准中的V类水、地下水质量标准V类水以及西安市区典型道路初期雨水中Cr的浓度。扩散试验结果显示,建筑垃圾再生骨料通过扩散释放进入水体中的重金属污染物量是有限的。另外,批式吸附试验结果显示,建筑垃圾再生骨料对雨水中重金属污染物具有一定吸附能力,但随着渗透时间的延长,再生骨料对重金属吸附能力呈下降趋势。因此,在雨水花园或地下储水空间建设中,建筑垃圾再生骨料能够满足对材料环境指标要求,不会造成海绵体中所储存的水体水质恶化。
The leaching toxicity test,diffusion test and batch adsorption test of typical pollutants in construction waste were carried out under different working conditions to evaluate the possible impact of construction waste on the quality of water storage when used as sponge city filling.The leaching test results show that under standard leaching conditions,the leaching toxicity of recycled aggregates of construction waste at different sampling points is limited;under enhanced leaching conditions,the Cr leaching concentration of construction waste collected near railways exceeds that in Class V water under both surface water and groundwater quality standard and the initial rainwater of typical roads in Xi'an urban area.The results of the diffusion test show that the amount of heavy metal pollutants released into the water body by the recycled aggregates through diffusion is limited.In addition,the batch adsorption test results show that the recycled aggregate has a certain adsorption capacity for heavy metal pollutants in rainwater,however,the adsorption capacity of recycled aggregate for heavy metals decreases with the extension of the penetration time.Therefore,in the construction of rain gardens or underground water storage spaces,recycled aggregates of construction waste can meet the requirements of material environmental indicators,and will not cause deterioration of the water quality of the water body stored in the sponge.
作者
李瑞琴
杨雄兵
陈磊
LI Ruiqin;YANG Xiongbing;CHEN Lei(Powerchina Northwest Engineering Corporation Limited,Xi'an 710065,China)
出处
《西北水电》
2021年第5期109-114,共6页
Northwest Hydropower
基金
中国电建集团西北勘测设计研究院有限公司科技项目(XBY-KJ-2017-15).
关键词
建筑垃圾
海绵城市
环境风险
浸出毒性
construction waste
sponge city
environmental risk
leaching toxicity
