Item	Standard Index			Status
Item	Influent area	Effluent area	Average	Status
pH	0.085	0.098	0.091	Qualified
DO	0.273	0.204	0.239	Qualified
COD_Mn	1.080	0.963	1.022	Exceed standard
COD_cr	1.020	1.370	1.195	Exceed standard
Ammonia nitrogen	2.768	1.498	2.133	Exceed standard
BOD₅	1.265	1.690	1.478	Exceed standard
TP	2.960	2.240	2.600	Exceed standard
Petroleum class	0.800	0.800	0.800	Qualified
Anionic surface-active agent	0.150	0.150	0.150	Qualified
Volatile phenol	0.100	0.100	0.100	Qualified
Sulfide	0.015	0.015	0.015	Qualified
Cyanide	0.003	0.003	0.003	Qualified
Zinc	0.010	0.008	0.009	Qualified
Copper	0.004	0.003	0.004	Qualified
Lead	0.001	0.001	0.001	Qualified
Cadmium	0.006	0.006	0.006	Qualified
Selenium	0.010	0.010	0.010	Qualified
Mercury	0.050	0.050	0.050	Qualified
Arsenic	0.023	0.024	0.024	Qualified
Chromium of six valence	0.040	0.040	0.040	Qualified
Fluoride	0.672	0.538	0.605	Qualified