在立管外面是一些软管和小管，用于回收合成泥浆和控制防喷器。
Outside the riser are several hoses and smaller pipes for recirculating the synthetic mud and controlling the blowout preventer.
因为这种泥浆较贵，而且对海洋生物有害，所以在钻探过程中，这种泥浆被回收到船上。
Because the mud is expensive and could be harmful to ocean life, it is recycled back to the ship during drilling.
废品可以被处理，作为副产品销售或回收为泥浆。
The waste product can be disposed, sold as a byproduct or recycled to the slurry.
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