砂滤床
The pond had recycle filter apparatus in which sand was biofield bed and air-pressed was powered.
并且对该鳖池的结构、滤床的熟化、再生、净化能力、应用管理做了初步的研究.
Modified equations for sand and coal filter bed backwashing
煤、砂滤层反冲洗计算公式
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