页岩气采出含砷废水处理工艺研究

Study on Treatment Process of Arsenic-Containing Shale Gas Wastewater

页岩气采出含砷(As)废水含盐量高且成分复杂,采用捕集分离+深度吸附复合工艺对页岩气采出废水中的重金属As进行去除。试验结果表明:对于低浓度页岩气采出含As废水,COD、SS、TDS和As的最大去除率分别为33.5%、95.3%、0.36%和80%;对于高浓度页岩气采出含As废水,COD、SS、TDS和As的最大去除率分别为34.9%、96.4%、0.97%和97.8%。通过深度吸附的低浓度与高浓度页岩气采出含As废水中的重金属As均未被检出,As排放符合GB 3838-2002《地表水环境质量标准》Ⅲ类水质标准。此种创新捕集分离+深度吸附复合工艺为页岩气采出废水在重金属As处理工艺方面提供了基础性数据和技术支持。

The arsenic-containing shale gas wastewater has high salinity and complex composition.In this study,capture separation and deep adsorption composite processes were used to remove heavy metal arsenic from shale gas wastewater.The experimental results showed that the maximum removal rates of COD Cr,SS,TDS,and As from low concentration arsenic-containing shale gas wastewater were 33.5%,95.3%,0.36%and 80%respectively.As for the higher concentration of arsenic-containing shale gas wastewater,the maximum removal rates of COD Cr,SS,TDS,and As were 34.9%,96.4%,0.97%and 97.8%respectively.The heavy metal arsenic from low and high concentration of arsenic-containing shale gas wastewater could be extensively removed by deep adsorption and consequently be in compliance with the water quality standards of classⅢin Environmental Quality Standards for Surface Water(GB 3838-2002).This novel method for the treatment of arsenic by capture separation and deep adsorption composite processes provides the basic data and technical support for arsenic removal applications from shale gas wastewater.