Wastewater being treated in secondary sedimentation tanks at sewage treatment plant in Southern California. Here particulates settle to the bottom of the tanks where they are collected as biosolids, or sludge, which can be used as a nutrient-rich crop fertilizer. Sewage treatment is a multi-stage operation that includes physical, chemical and biological processes to remove contaminates from water. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Matulavich, Peter |
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