PHYTOREMEDIATION OF TPH IN VERTICAL-FLOW CONSTRUCTED WETLANDS FORIRRIGATION RE-USE, SOIL AND WATER POLLUTION CONTROL

A SANI, A R SANDA, U K ADAMU, H ALMU, M A AMIN, M SCHOLZ

Abstract


A study, was carried out using  different laboratory-scale vertical-flow constructed wetlands filled with gravel and planted with common reed were operated and assessed for hydrocarbon wastewater reclamation between September, 2013 and April 2014 in a green house on top of Newton building, University of Salford, Manchester, UK. The aim was to assess if total petroleum hydrocarbons (TPHs) waste water could be treated and reclaimed by different vertical-flow wetlands under different design and operational variables and successfully be re-used for irrigation, water and soil quality improvement instead of direct discharge to the receiving environment. Findings indicate that all the TPHs treated in the wetland filters were highly degraded (>90% removal efficiency) in all contaminated filters with some even attenuated below detection limit of 0.01mg/l. Withregards to other pollutants, the results revealed that all wetland systems have shown relatively high removal efficiencies for the key water quality parameters regardless of filter set-up. However, removal efficiencies dropped for those filters impacted by the TPHs contamination compared to the uncontaminated ones. The reclaimed wastewater was tested for irrigation re-use compliance using International standards and findings indicate that wetland effluents complied with re-use permissible limits and could be very proficient tool to produce a good yield of crops, suggesting that the systems can be a potential waste water management tool and source of irrigation water rich in nutrients and minerals that can increase soil fertility and furnish agricultural crops with appropriate nutrients for their normal growth and development.


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