The nitrogen compounds through which excess nitrogenis eliminated from organisms are called nitrogenous wastes or nitrogen wastes. They are ammonia, urea, uric acid, and creatinine. All of these substances are produced from protein metabolism.
In particular, the following wastewater treatment processes are caried out: preliminary treatment (physical) to remove large debris and grit, primary treatment (physical) to remove settleable suspended solids, secondary treatment (biological) to remove the remaining particulates and dissolved organic material and chemical.
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it generates NADH for use in mitochondrial ATP production