单项选择题

A.渗滤液进水COD约为5000mg/L,反渗透出水COD低于150mg/L
B.生化段出水COD约为500mg/L,物化段出水COD约为100mg/L
C.超滤段出水COD约为200mg/L,反渗透出水COD约为150mg/L
D.物化段出水COD约为300mg/L,反渗透出水COD低于100mg/L