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Cr6+��80 mg/l

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FeSO4·7H2O: Ͷ��2.4kg/��ˮӋ��r��2000Ԫ/��,��4.8Ԫ/��ˮ

NaOH��Ͷ��c�r�X��2800Ԫ/��Ӌ��,��ˮ��ҪͶ��0.4ǧ�ˣ��A��Ȱ�96%Ӌ��,��0. 4ǧ��ˎ/��ˮ÷96%×0.28�fԪ/��ˎ=0.12Ԫ/��ˮ

3. ��ˮ�\��M�ã��O(sh��)��f�M�� 0.31+ 4.8 + 0.12��5.23Ԫ/��ˮ

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