CAJ | 학술논문

为了控制电镀行业污染、减少重金属离子排放、加强资源利用，研究了pH值对电镀废水中重金属离子浸出的影响．将电镀废水用氢氧化钠溶液逐渐调节废水pH值，在多个pH值点分别沉淀出电镀废水中铜、铬、锌和镍．结果表明．随溶液pH值的升高，溶液中的铜、铬、锌和镍先沉淀后又部分溶解，实际操作中应将pH值控制在9．0～9．5范围内．电镀污泥经酸浸后，常温下电动搅拌1h，在浸出液中加入锰铁合金块可直接还原铜、镍和锌离子，调节pH值至9．5时，可沉淀出铁、锰、铬混合金属氢氧化物．
위료공제전도행업오염、감소중금속리자배방、가강자원이용，연구료pH치대전도폐수중중금속리자침출적영향．장전도폐수용경양화납용액축점조절폐수pH치，재다개pH치점분별침정출전도폐수중동、락、자화얼．결과표명．수용액pH치적승고，용액중적동、락、자화얼선침정후우부분용해，실제조작중응장pH치공제재9．0～9．5범위내．전도오니경산침후，상온하전동교반1h，재침출액중가입맹철합금괴가직접환원동、얼화자리자，조절pH치지9．5시，가침정출철、맹、락혼합금속경양화물．
In order to control the pollution of the electroplating industry, reduce the emissions of heavy metal ions, and improve resource utilization, the effects of pH on the leaching of heavy metal ions in electroplating wastewater is studied. Copper, chromium, zinc and nickel are precipitated at various pH, by gradually adjusting the pH of electro- plating wastewater with sodium hydroxide solution. It shows that hydroxides of copper, chromium, zinc and nickel precipitate first and dissolves with the pH value increasing. The actual operation is that Cu, Zn, Cr and Ni are precip- itated at pH = 9.0-9.5. After electroplating sludge acid leaching, Fe-Mn alloy is used as reducing agent to reduce low melting point heavy metal ions of copper, nickel and zinc. Adjusting pH to 9.5, the mixed hydroxides of Fe, Mn and Cr can be precipitated.