即主要通过混凝和短时直接曝气对待处理的生活污水作预处理，然后通过河沙或炉渣滤料进行过滤处理。
That is, use coagulation and direct aeration in short time for primarily treatment of domestic sewage, then filter domestic sewage by slag filtration or sands.
即主要通过混凝和短时直接曝气对待处理的生活污水作预处理，然后通过河沙或炉渣滤料进行过滤处理。
That is, use coagulation and direct aeration in short time for primarily treatment of domestic sewage, then filter domestic sewage by slag filtration or sands.
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