Wastewater being treated in aerobic digester at sewage treatment plant in Southern California. Here air is pumped into the water to promote the growth of bacteria, protozoa, rotifers, nematodes, and other organisms which eat organic material. 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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