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: The phytoremediation potential of two macrophytic plants, E.crassipes and T.capensis were evaluated for their capacity to remove total dissolved solids (TDS) from a plastic recycling industrial effluent. The effluent was collected from a plastics recycling company in Harare, Zimbabwe. Experimental design was used in the research and the pants were grown in 2.5L plastic pots. The experiment consisted of 8 treatments with replicates. TDS, electrical conductivity and pH were measured every day for 15 days and proline accumulation in plant leaves was analyzed every 2 days alongside wastewater treatment. A t-test analysis was used for testing the data for significance difference. Result show that T.capensis had reduced TDS by 77.3% in diluted and 69.3% in undiluted effluent while E.crassipes, also remarkable TDS reduction of 65.1% in diluted and 57.8% in undiluted effluent. Statistical analysis showed no significant difference at p < 0.05 for the two plants. TDS reduction by both plants was accompanied by an increase in pH and decrease electrical conductivity. Waste water only and wastewater + soil controls showed a TDS concentration decreased of 5.0 % and 42.1% after treatment which may be due to microbial activity. Proline accumulation for both plants in undiluted effluent (30.05% in Typha spp. and 19.04% in Eichhornia spp.) is an indication of high TDS stress capability of the two plants. The proline concentration results show significant difference between day 0 and day 6 at p < 0.05.

iosr journal of environmental science, toxicology and food technology

An assessment of phytoremediation capacity of Eichhornia crassipes and Typha capensis for the removal of total dissolved solids in plastic recycling industry wastewater.