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【单选题】
工业、农业及城市生活污水中含有磷，家用洗涤剂是生活污水中磷的一个重要来源（洗涤剂中含有三聚磷酸钠）。在处理污水时要不要除去磷？下列哪种说法正确？（ ）A.
磷是生物的营养元素，不必除去
B.
含磷的污水是最好的肥料，不必除去
C.
含磷的污水排到自然水体中会引起藻类增殖，使水变质，必须除去
D.
磷对人体无害，除去与否无关紧要
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