問題詳情
四、飲用水水源水質標準第五條中說明: 以地面水體或地下水體做為自來水及簡易自來水之飲用水水源時，對於其水質有下列之規定：(1)大腸桿菌群密度＜20,000MPN / 100 mL（或 CFU / 100 mL）（具備消毒單元者），或是＜50 MPN / 100 mL（或 CFU / 100 mL）（未具備消毒單元者），(2)氨氮（NH3-N）＜1 mg / L，(3)化學需氧量（COD）＜25 mg / L，(4)總有機碳（TOC）＜4 mg / L。試說明對於做為飲用水水源的水體為什麼需要有此類之水質要求？（10 分）
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