Trickling filters at a sewage treatment works. Trickling filters are a type of aerobic wastewater treatment, where sewage or wastewater flows down into a bed of rocks. The flow of wastewater promotes a layer of microbial slime to grow on the bed. Pollutants are removed from the wastewater through adsorption and absorption of organic matter by the microbial layer. Photographed in Wales, UK.

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達志影像

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