which can be used to generate electrical energy. Sludge may also be incinerated, or condensed, heated to disinfect it, and reused as fertilizer. Secondary remedy removes dissolved and suspended organic matter, typically utilizing microorganisms in a managed environment. Most secondary treatment methods use aerobic micro organism, which devour the organic parts of the sewage . Some techniques use mounted film methods, where the micro organism grow on filters, and the water passes by way of them. Suspended growth systems use “activated” sludge, where
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