污泥生物炭对矿区河道受污染疏浚底泥中重金属的固化效果
IMMOBILIZATION EFFECT OF SLUDGE BIOCHAR ON HEAVY METALS IN CONTAMINATED DREDGED SEDIMENT IN RIVER CHANNELS IN MINING REGION
刘维 1徐志嫱 2李红星 3曹琛洁 2董雯 2冯民权 2戚明旸 3李江波 3寇晓梅 3邵甜3
作者信息
- 1. 西安理工大学西北旱区生态水利国家重点实验室,西安 710048;河北工程大学能源与环境工程学院,河北邯郸 056038
- 2. 西安理工大学西北旱区生态水利国家重点实验室,西安 710048
- 3. 中国电建集团西北勘测设计研究院有限公司,西安 710065
- 折叠
摘要
为研究污泥生物炭对矿区河道受污染的疏浚底泥中Cu、Pb和Cd的固化效果,以市政污泥为原料在500 ℃缺氧条件下制备污泥生物炭,结合扫描电镜、FTIR和XPS等表征手段,分析污泥生物炭投加比对疏浚底泥中3种重金属形态分布和固化效果的影响.结果表明:污泥生物炭的投加可提高疏浚底泥中重金属的稳定化形态,投加比为1.0％时,疏浚底泥中Cu、Pb和Cd稳定态(可氧化态和残渣态)占比分别提高了 37.7％、42.9％和42.4％.污泥生物炭主要通过络合反应和沉淀作用固化重金属,经污泥生物碳固化后,底泥中Cu、Pb和Cd的浸出浓度分别由处理前的0.8763,0.0574,0.0185 mg/L 降低到 0.2527,0.0106,0.0013 mg/L,浸出浓度低于 GB 3838-2002《地表水环境质量标准》的Ⅲ类标准限制,处理后的疏浚底泥可进行资源化利用,基本不会产生重金属二次溶出的风险.
Abstract
To clarify the immobilization effect of sludge biochar on Cu,Pb,and Cd in dredged sediment contaminated by river channel in a mining region,this study used the municipal sludge as raw material to prepare sludge biochar under anoxic condition at 500 ℃,analyzed the influences of addition ratios of different sludge biochar on the distribution and immobilization effect of three heavy metals in dredged sediment,combining with characterization methods of scanning electron microscopy,FTIR and XPS.The results showed that the addition of sludge biochar could improve the stabilization forms of heavy metals in dredged sediment.When the addition ratio was 1.0％,the proportion of Cu,Pb,and Cd in the stable(oxidizable and residual)in dredged sediment increased by 37.7％,42.9％,and 42.4％,respectively.Sludge biochar mainly immobilizes heavy metals through complexation reaction and precipitation.The leaching concentration of Cu,Pb,and Cd in the dredged sediment after sludge biochar immobilized decreased from 0.876 mg/L,0.057 mg/L and 0.018 mg/L to 0.253 mg/L,0.011 mg/L and 0.001 mg/L,respectively.Meanwhile,the leaching concentration was lower than the limit of the Class Ⅲstandard of Environmental Quality Standard for Surface Water(GB 3838-2002).The immobilized dredged sediment can be reused as resources with no risk of secondary dissolution of heavy metals.
关键词
污泥生物炭/矿区河道/疏浚底泥/重金属/固化效果Key words
sludge derived biochar/rivers in mining region/dredged sediment/heavy metal/immobilization effects引用本文复制引用
基金项目
陕西省自然科学基金(2021JM-329)
出版年
2024
NETL
NSTL
万方数据