Abstract:

The highly concentrated electroplating wastewater containing chromium from a company in Qingdao, Shangdong，has been treated by recycling yellow chrome and ferrite process，and various influencing factors investigated. The results show that，the Cr(Ⅲ) oxidizing rate is up to 95.23%，when the initial pH of the wastewater is 9.0，reaction temperature 70 ℃，and oxidizing time 60 min. After the oxidized wastewater is filtered，the mother liquor of yellow chrome can be obtained. The chrome recovering rate from the mother liquor can reach 100%, obtaining qualified yellow chrome product，when the mother liquor pH is regulated to 9.0，reaction temperature 60 ℃，and Pb(NO₃₂ dosage 52.6 g/L. Ferrite process is used for subsequent treatment. Both of the content of chrome and lead in the effluent water can meet the requirements of GB 21900-2008.

Key words: chromium, electroplating wastewater, yellow chrome, ferrite, secondary pollution

摘要：

采用回收铬黄和铁氧体法对青岛某公司的高浓度含铬电镀废水进行资源化处理，并考察各因素的影响．实验结果表明，当废水初始pH=9.0，反应温度为70℃，氧化时间60 min时，废水中三价铬的氧化率达95.23%．将氧化后的废水过滤，得到铬黄母液．调节母液pH=9.0，反应温度60℃，加入硝酸铅52.6 g/L，母液中铬回收率可达100%，可获得合格的铬黄产品．采用铁氧体法进行后续处理，出水中的铬、铅均达到GB 21900-2008要求．

关键词: 铬, 电镀废水, 铬黄, 铁氧体, 二次污染

CLC Number: 

• X703