Research on Resource Treatment of Oily and High-salt Wastewater in Non-ferrous Metal Industry
The raffinate in the production of copper sulfate in a non-ferrous metal smelting enterprise is a kind of oily high-salt wastewater.The concentration of petroleum is 92.5 mg/L,the concentration of TOC is 89.5 mg/L,and the main salt is sodium sulfate.In this paper,the air flotation oil removal method was selected as the pretreatment process,and the fixed bed activated carbon adsorption method was used to remove the oil from the wastewater.The results show that the oil removal effect of air flotation method is limited,the removal rate of petroleum pollutants is 30.9%,the removal rate of TOC is 33.1%,and there are still most of the oil residues.In the fixed bed activated carbon adsorption method,the up-flow water inlet method has a higher oil removal rate,which can reach about 80%.When the water flow rate is set to 500～1 000 mL/h,the better treatment effect and higher treatment efficiency can be obtained,and the effluent effect is stable from 2 h after the adsorption to the end of the adsorption.Anhydrous sodi-um sulfate(sodium sulfate)can be obtained by separating and extracting the wastewater after oil remov-al,and its quality is close to the first-class product of national standard I by analysis.
high salt wastewaterdissolved air flotationactivated carbon adsorptionoily wastewaterlow-temperature thermal concentrationsodium sulfate
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