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当前学科：水质工程学
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地下水除锰宜采用接触氧化法，当原水含铁量高于2．0mg／L、含锰量高于1．5mg／L时，应通过试验确定。其工艺流程必要时可采用：原水曝气一（）一1次过滤除铁一2次过滤除锰。
A . 沉淀
B . 絮凝
C . 氧化
D . 混合
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