Table 2.

Heavy metals concentration in wastewater treatment effluent and compare with different standards.

Parameter	Units	Effluent	Iran Standards for agricultural use	EPA Standards for agricultural use	WHO Standards for agricultural use
Ni	µg/L	184±96	2000	200	200
Pb	µg/L	402±80	1000	5000	5000
Cu	µg/L	50±62	200	200	200
Cr	µg/L	98±12	1000	100	100