Treatment of Electroplating Wastewater by Oyster Shell Powder Combined with UV/H2O2

• Main Authors: LIU,HOU-ZHI, 劉厚志
• Other Authors: Hsing Yuan Yen
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/xhxup7

碩士 === 高苑科技大學 === 化工與生化工程研究所 === 102 === In this study, the real electroplating wastewater were sampled from an electroplating factory located in Gangshan section, Kaohsiung. Electroplating wastewater plant was divided into two parts, one is rinse wastewater, and the other is chromium wastewater. The investi-gation of water qualities included pH, DOC, COD, conductivity, SS, heavy metals, where the test of heavy metal were iron, chromium, nickel, lead, copper and cadmium. The water quality of rinse wastewater and chromium wastewater were pH 2.27 and 4.1, DOC 300.93 mg/L and 83.27 mg/L, COD 1324.4 mg/L and 383.6 mg/L, SS 50.4 mg/L and 66.4 mg/L, and conductivity 22.1 ms/cm and 3.93 ms/cm. In addition, the concentration of iron concentration is 340.3 mg/L of rinse wastewater and the chromium is 301.9 mg/L of chromium wastewater. The results showed that the heavy metal could be remove from wastewater by oyster shell powder. Because of the alkalinity of oyster shell powder in the water, the mechanism of removal of heavy metal is precipitation by heavy hydroxide. The order of heavy metal removal is as follow: Cr ﹥Fe ﹥Ni for rinse wastewater. The removals were 100%, 98%, and 96%, respectively. On the other hand, the heavy metal removal order is as follow: Fe = Ni ﹥Cr. The removals were 100%, 100%, and 79.9%, respectively. After treatment of oyster shell powder, the supernatant was treated by UV/H2O2 oxidation. The results showed that the DOC reduced from 16.64mg/L to 0.23mg/L for chro-mium wastewater .The DOC removal was 98.6%. Further, the DOC reduced from 30.87mg/L to 0.91mg/L for rinse wastewater by UV/H2O2 oxidation. The DOC removal was 97.1%. Thus, the treatment of oyster shell powder combined with UV/H2O2 could reduce heavy metal and organics for electroplating wastewater.