The results showed that magnesium hydroxide had good effect for decoloring and suspended substance removal,meanwhile,removal rate of chemical oxygen demand was also quite high. 研究结果表明，氢氧化镁在印染废水的处理过程中，具有良好的脱色效果和悬浮物的去除效果，对化学需氧量的去除率也相当高。
chemical cxygen demand怎么读 chemical cxygen demand是什么意思
