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Background: It is necessary to monitor the performance of the industrial wastewater treatment plants in order to achieve the desired environmental standards. This study was carried out to determine the efficiency of the nitrogen removal, phosphorus compounds and chemical oxygen demand (COD) and comparing the effluent standard with the effluent industrial wastewater treatment plant of Agh Ghala, Iran.   Methods: The present cross sectional study was conducted in 2011 during six months. Sampling was performed two times per week from the incoming wastewater, pond aeration and effluent. Composite sampling was conducted for the treatment plant input, and for the other units it was done momentarily. Overall, 48 times wastewater sampling and testing was performed. Findings: The mean concentrations of total nitrogen, phosphorus and COD in influent were 7.36 ± 4.23 mg N/l, 68.1 ± 26.4 mg P/l and 5.7 ± 3.6 and 294.2 ± 183.5 mg/l. Total nitrogen, phosphorus and COD showed a removal of about 86%, 67% and 95%, respectively. According to the standard, discharge of effluent wastewater treatment to surface water was acceptable (except phosphorus). Conclusion: The effluent quality of this treatment plant was according to the effluent disposal standards except for phosphorus. However, this problem is solvable by accurate management and supervision on wastewater treatment plant.

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