摘要
煤化工行业生产过程中产生的高盐废水因重金属难以有效去除,严重制约后续废水资源化利用。采用活性炭吸附法对高COD(化学需氧量)焦化废水中的重金属离子进行深度处理,系统探讨三种不同规格活性炭及其级配组合对铁离子(Fe^(3+))和锰离子(Mn^(2+))的吸附性能。实验结果表明,活性炭对铁离子的吸附速率更高,焦化废水COD有机物具有协同增强作用。活性炭的吸附能力与其物理特性密切相关,小粒径活性炭吸附速率快,但易饱和,高比表面积活性炭吸附容量最大。通过优化级配比例,动态吸附柱在120 min内可将出水中的ρ(Fe^(3+))、ρ(Mn^(2+))均降至0.05 mg/L以下,Fe^(3+)和Mn^(2+)的去除率分别为74.0%和98.5%,满足后续反渗透工艺的进水要求。研究结果为高COD焦化废水的重金属深度处理提供了技术参考。
The high salt wastewater generated in the production process of the coal chemical industry is difficult to effectively remove heavy metals,which seriously restricts the subsequent utilization of wastewater resources.This study uses activated carbon adsorption method to deeply treat heavy metal ions in high COD(chemical oxygen demand)coking wastewater,and systematically explores the adsorption performance of three different specifications of activated carbon and their gradation combinations on iron(Fe^(3+))and manganese(Mn^(2+)).Through experimental analysis,the adsorption rate of activated carbon on iron ions is significantly higher than that of manganese ions,and the COD organic matter in wastewater has a synergistic enhancing effect on heavy metal adsorption.The adsorption capacity of activated carbon is closely related to its physical properties.Small particle size activated carbon has a fast adsorption rate but is easily saturated,while high specific surface area activated carbon has the highest adsorption capacity.By optimizing the grading ratio,the dynamic adsorption column can reduceρ(Fe^(3+)),ρ(Mn^(2+))in the effluent to below 0.05 mg/L within 120 minutes,with removal rates of Fe^(3+)74.0% and Mn^(2+)98.5%,respectively,meeting the inlet requirements of subsequent reverse osmosis processes.This study provides technical reference for the deep treatment of heavy metals in high COD coking wastewater.
作者
段吉
Duan Ji(Shanxi Tongzhou Coal and Coke Group Co.,Ltd.,Changzhi Shanxi 046500,China)
出处
《山西化工》
2025年第11期248-251,共4页
Shanxi Chemical Industry
关键词
重金属
活性炭
COD
焦化废水
heavy metals
activated carbon
COD
coking wastewater
