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Phosphorus in sewage primarily occurs in three forms: organic phosphorus, inorganic phosphorus, and particulate phosphorus. Organic phosphorus is present in the form of phospholipids, nucleic acids, and proteins, which are part of human and animal waste. Inorganic phosphorus mainly exists as orthophosphates such as ( \text{PO}_4^{3-} ), which are _________ ____ _______ ______ ________ _________ ______ _____ __________ ______ ________.
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