The purpose of this experiment is to threat the chromium and cyanide wastewaters which are main by-products in plating industry. the chromium and cyanide are used the improvement of the functional properties such as durability, anti-corrosivity, etc., but those wastewaters generate hazardous organic...
The purpose of this experiment is to threat the chromium and cyanide wastewaters which are main by-products in plating industry. the chromium and cyanide are used the improvement of the functional properties such as durability, anti-corrosivity, etc., but those wastewaters generate hazardous organic and heavy metal ion in the treatment process and effect harmful in the human and ecology. The main process of this experiment is a development of a Zero Discharge System(ZDS) in plating wastewater treatment process by reverse osmosis(RO) membrane separation system. After analyzing real plating wastewater, model plating wastewater was synthesized as 300ppm, 200ppm and 100ppm in the chromium and 150ppm, 100ppm and 50ppm in the cyanide wastewater. And then model and real plating wastewater was treated according to the pH and temperature by pH-2.5, pH-8.0, pH-11.5 and 25℃, 35℃, 50℃. Model plating wastewater was treated in the first stage, and then that results were applied in real plating wastewater treatment. At frist, in the chromium wastewater treatment, model plating wastewaters were treated according to the concentration variation and the vest permeate flux and rejection rate are 99.59ℓ/㎡ㆍhr, and 91,76% in 100ppm. The results are the same tendency in real plating wastewater by 104.09ℓ/㎡ㆍhr and 85.69% in 100ppm. In the treatment by pH and temperature variation, the best results are the base(pH-11.5) and 50℃ in permeate flux, but are the neutrality(pH-8.0) and 25℃ in rejection rate. So the best conditions of permeate flux and rejection rate are neutrality(pH-8.0) and 25℃ in model and real chromium plating wastewater treatment. The second, in the model and real cyanide plating wastewater treatment, best results are 50ppm, neutrality(pH-8.0) and 50℃ in the permeate flux but are 50ppm, neutrality(pH-8.0) and 25℃ in the rejection rate. So best conditions are 50ppm, and neutrality(pH-8.0) and 25℃. The third, in the COD rejection rte of real chromium and cyanide wastewater, the chromium wastewater was 59.345, 61.78&, 43.28% and 44.32% and the Cyanide wastewater was 98.34%, 98.02%, 97.58% and 96.07% respectively. As a result, the conclusion of this experimental was very effect in the treatment of plating wastewater by using reverse osmosis(RO) membrane system, but appropriate pre-treatment and post-treatment was essential to expect perfect rejection effect as sand filtration, ultra-filtration(UF) of micro-filtration(MF) of adding the powdered activated carbon(PAC).
The purpose of this experiment is to threat the chromium and cyanide wastewaters which are main by-products in plating industry. the chromium and cyanide are used the improvement of the functional properties such as durability, anti-corrosivity, etc., but those wastewaters generate hazardous organic and heavy metal ion in the treatment process and effect harmful in the human and ecology. The main process of this experiment is a development of a Zero Discharge System(ZDS) in plating wastewater treatment process by reverse osmosis(RO) membrane separation system. After analyzing real plating wastewater, model plating wastewater was synthesized as 300ppm, 200ppm and 100ppm in the chromium and 150ppm, 100ppm and 50ppm in the cyanide wastewater. And then model and real plating wastewater was treated according to the pH and temperature by pH-2.5, pH-8.0, pH-11.5 and 25℃, 35℃, 50℃. Model plating wastewater was treated in the first stage, and then that results were applied in real plating wastewater treatment. At frist, in the chromium wastewater treatment, model plating wastewaters were treated according to the concentration variation and the vest permeate flux and rejection rate are 99.59ℓ/㎡ㆍhr, and 91,76% in 100ppm. The results are the same tendency in real plating wastewater by 104.09ℓ/㎡ㆍhr and 85.69% in 100ppm. In the treatment by pH and temperature variation, the best results are the base(pH-11.5) and 50℃ in permeate flux, but are the neutrality(pH-8.0) and 25℃ in rejection rate. So the best conditions of permeate flux and rejection rate are neutrality(pH-8.0) and 25℃ in model and real chromium plating wastewater treatment. The second, in the model and real cyanide plating wastewater treatment, best results are 50ppm, neutrality(pH-8.0) and 50℃ in the permeate flux but are 50ppm, neutrality(pH-8.0) and 25℃ in the rejection rate. So best conditions are 50ppm, and neutrality(pH-8.0) and 25℃. The third, in the COD rejection rte of real chromium and cyanide wastewater, the chromium wastewater was 59.345, 61.78&, 43.28% and 44.32% and the Cyanide wastewater was 98.34%, 98.02%, 97.58% and 96.07% respectively. As a result, the conclusion of this experimental was very effect in the treatment of plating wastewater by using reverse osmosis(RO) membrane system, but appropriate pre-treatment and post-treatment was essential to expect perfect rejection effect as sand filtration, ultra-filtration(UF) of micro-filtration(MF) of adding the powdered activated carbon(PAC).
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