Experimental study on adsorption and removal of heavy metal ions in high COD coking wastewater
It is difficult to effectively remove the heavy metals in the high-salt wastewater of coal chemical industry,which results in the dangerous waste of the impurity salt obtained in the following separating salt technology,which seriously restricts the resource utilization and reuse of coal chemical wastewater.In this paper,the deep removal of heavy metal ions from coking wastewater by activated carbon adsorption method was studied,and examined the effectiveness of three different specifications of activated carbon and their graded bed layers in removing heavy metals.The results show that the adsorption rate of iron ions was higher than that of manganese ions in coking wastewater,and the COD organic matter in wastewater has a beneficial effect on the adsorption and removal of heavy metal ions.The ad-sorption capacity of activated carbon is related to its own characteristics.The performance of activated carbon in adsorbing and removing heavy metals is related to its own characteristics.Activated carbon with small particle size has a faster adsorption rate and a shorter ad-sorption time to saturation.Activated carbon with a larger specific surface area has the strongest adsorption capacity,and graded activa-ted carbon can achieve the best comprehensive removal effect.When the gradation ratio of activated carbon A,activated carbon B and activated carbon C is 1:3:2,using an adsorption column for dynamic continuous treatment of coking wastewater has good initial adsorp-tion and removal ability of heavy metal ions in the wastewater.After adsorption for 120 minutes,the content of manganese ions and iron ions in the effluent was both below 0.05 mg/L,and the removal rates were 98.7％and 79.4％,respectively.The effluent can meet the requirements of the following treatment processes for iron and manganese ion content not higher than 0.05 mg/L.
coking wastewaterheavy metalsactivated carbonadsorption and removal
万方数据
维普
