RECOVERY OF HEAVY METALS FROM ELECTROPLATING LIQUID EFFLUENTS
Rehan Mohamed Mounir Morsi Abd El-Fattah;
Abstract
Abstract
Effluents discharged from surface finishing and plating industry usually contains metal-ion concentrations much higher than the permissible levels. Due to their high toxicity, industrial wastewaters containing heavy metals are strictly regulated and must be treated before being discharged in the environment. One of the most techniques has been employed for the treatment of heavy metals, is electrocoagulation. Electrocoagulation involves dissolution of metal from the anode with simultaneous formation of hydroxyl ions and hydrogen gas occurring at the cathode which reduce metal concentration to the lowest ppm range and allow recovery of valuable metal. The aim of this work is to treat electroplating wastewater using electocoagulation with electochemical corrosion of the sacrificial soluble (alumnium electodes, iron electrodes) and insoluble (carbon electrodes, and stainless steel electrodes) using ferric chloride or alum as coagulant. Several key parameters affecting the efficiency of electrocoagulation and coagulation were investigated with laboratory scale experiments in search of optimal parameter values. Optimal values of the parameters were determined on the basis of the efficiency of metal removal from synthetic solution then applied on factory effluent. The parameters investigated in the study were type of electrode, electrical potential and electrocoagulation time. Results revealed that the best removal was achieved at 30 minutes and potential difference 10 volts for stainless steel electrode with ferric chloride as coagulant. The removal efficiency for synthetic solution of zinc, copper and nickel is 97.5%, 97.2% and 97.1% respectively and for factory sample is 100%, 99.6% and 99.8%, these results are agreeing with environmental laws so, it can be discharged easily into water streams. The electroplating effluent solution was passed through a flow-through electrochemical treatment cell consisting 6 parts, the stainless steel electrodes assembly in two parallel electrodes in each part of cell. Experimental was run at room temperature 25 o C at constant Voltage 10 voltage and flow rate 100 ml/min.
Effluents discharged from surface finishing and plating industry usually contains metal-ion concentrations much higher than the permissible levels. Due to their high toxicity, industrial wastewaters containing heavy metals are strictly regulated and must be treated before being discharged in the environment. One of the most techniques has been employed for the treatment of heavy metals, is electrocoagulation. Electrocoagulation involves dissolution of metal from the anode with simultaneous formation of hydroxyl ions and hydrogen gas occurring at the cathode which reduce metal concentration to the lowest ppm range and allow recovery of valuable metal. The aim of this work is to treat electroplating wastewater using electocoagulation with electochemical corrosion of the sacrificial soluble (alumnium electodes, iron electrodes) and insoluble (carbon electrodes, and stainless steel electrodes) using ferric chloride or alum as coagulant. Several key parameters affecting the efficiency of electrocoagulation and coagulation were investigated with laboratory scale experiments in search of optimal parameter values. Optimal values of the parameters were determined on the basis of the efficiency of metal removal from synthetic solution then applied on factory effluent. The parameters investigated in the study were type of electrode, electrical potential and electrocoagulation time. Results revealed that the best removal was achieved at 30 minutes and potential difference 10 volts for stainless steel electrode with ferric chloride as coagulant. The removal efficiency for synthetic solution of zinc, copper and nickel is 97.5%, 97.2% and 97.1% respectively and for factory sample is 100%, 99.6% and 99.8%, these results are agreeing with environmental laws so, it can be discharged easily into water streams. The electroplating effluent solution was passed through a flow-through electrochemical treatment cell consisting 6 parts, the stainless steel electrodes assembly in two parallel electrodes in each part of cell. Experimental was run at room temperature 25 o C at constant Voltage 10 voltage and flow rate 100 ml/min.
Other data
| Title | RECOVERY OF HEAVY METALS FROM ELECTROPLATING LIQUID EFFLUENTS | Other Titles | إسترجاع الفلزات الثقيلة من مخلفات الطلاء الكهربي | Authors | Rehan Mohamed Mounir Morsi Abd El-Fattah | Issue Date | 2017 |
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