Phosphate Removal from Karun Agro-Industry INC Agricultural Wastewater through Vetiver planation, and within Free Water Surface Constructed Wetland

Document Type : Research Paper


1 PhD Candidate, Department of irrigation & Drainage. Shahid Chamran University, Ahwaz, Iran

2 Professors, Water Sciences Engineering, Shahid Chamran University, Ahwaz, Iran

3 Assistant Professor, Water Sciences Engineering, Shahid Chamran University, Ahwaz, Iran


To investigate the performance of artificially constructed wetland in phosphate removal from agricultural wastewater, free water surface constructed wetlands were employed. Nine rectangular pools were constructed and operated continuously from December 2013 until May 2014. Three of the units were filled with soil and planted with vetiver transplants (S), three were cultivated with vetiver on some floating platforms (F) and three kept non- planted as control (C). The study was divided into 6 phases, each of a 6 month, period, using three HRTs (3, 5 and 7 days). Concentration of phosphate was evaluated at the inlet vs outlet of the system, and the data analyzed, using SAS, to find out the significance between or among factors. The average phosphate concentration, in the wastewater entering the unit was recorded 5.99-8.58 mg/L. The results indicated that the phosphate removal performance of the constructed wetland units differed significantly (P < 0.05) correct. The average removal rates being different for any of the: cultivation method, HRT, and temperature treatments. The units that contained soil substrate(S) presented the most appropriate in performance removal, the efficiency of which was 9.46–35.48%. The removal rates were also positively correlated with HRT, since the performance for phosphate removal was on the average 8.88-35.48% for 7days of HRT. In addition, it was shown that there existed a significant difference (P < 0.05) in phosphate removal between different months in most units. The results finally indicated that the average phosphate removal rate was significantly affected by temperature variations, CW and HRT. The highest phosphate removal efficiency (average 35.48%) occurred in May, when kept for 7 days, and when under soil substrate medium.


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