Effect of influent load fluctuation on the efficiency of vertical constructed wetlands treating dairy farm wastewater

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Sharma Pradeep Kumar; Rani Anju; Minakshi Deepa; Malaviya Piyush

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Journal Paper

Paper Information

Journal: ADVANCES IN ENVIRONMENTAL TECHNOLOGY Year:2023 | Volume:9 | Issue:3 Page(s): 227-241

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Information Journal Paper

Title

Effect of influent load fluctuation on the efficiency of vertical constructed wetlands treating dairy farm wastewater

Author(s)

Sharma Pradeep Kumar | Rani Anju | Minakshi Deepa | Malaviya Piyush | Issue Writer Certificate

Keywords

Vertical sub-surface flow constructed wetland

influent loads

dairy farm wastewater

organic matter

BOD

Abstract

Three vertical sub-surface flow (VSSF) constructed wetland (CW) systems (CW-1, CW-2 and CW-3) filled with different filter media, each 4 m2 in area, planted with Arundo donax was operated for 4 years for treating dairy farm wastewater. The vertical CW systems received high fluctuations in influent concentration and loads i. e. BOD (26 to 619 mg L-1 and 1. 5 to 34 g m-2 d-1), TSS (165 to 643 mg L-1 and 9. 1 to 24 g m-2 d-1), TP (16 to 49. 9 mg L-1 and 1. 2 to 2. 7 g m-2 d-1) and NH4-N (24. 5 to 76. 2 mg L-1 and 1. 3 to 4. 2 g m-2 d-1) during the assessment period. Average annual removal rates showed fluctuations in removal of BOD (70. 5 to 92. 9%), TSS (82. 5 to 97. 5%), TP (51. 1 to 91. 9%) and NH4-N (34. 6 to 69%). This shows that the removal of BOD is very sensitive to inlet load fluctuations in CWs. High inlet loads may confine good nitrification that affects ammonium-nitrogen removal while TP removal rate reduced when inlet TP loads reduced. The average concentration of the pollutants (BOD, TSS, TP and NH4-N) in the treated effluent showed noticeable decrease: 43. 4 to 16. 1 mg L-1 for BOD, 43. 3 to 11. 7 mg L-1 for TSS, 17. 9 to 3. 1 mg L-1 for TP and 33. 2 to 22. 7 mg L-1 for NH4-N. Thus from the outcomes of the current study, it can be concluded that the VSSF CW system may provide promising outcomes despite there is fluctuations in the influent loads.

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