2.3. Operational procedureThe phytoremediation process with attached growth wasoperated in an ambient air temperature (27e29 C) for 15 months.After the acclimatization period, the experiments were initiatedfrom January 2012 to June 2012 to determine the state of presentwetland system denoted by hydraulic retention time (HRT), treatmentperformance and plant growth with the intention of organicpollutant elimination considering the effluent discharge normsspecified by the national pollution control board of Iran(COD < 100 mg/L and biochemical oxygen demand (BOD5) <30 mg/L). Under the steady state conditions, the phytoremediation systemwas operated in eight phases between 24 and 11 h HRT with a mean
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