Phytoremediation for reducing TDS value in wastewater

I am conducting an experiment on the effectiveness of water lettuce (Pistia stratiotes) in reducing TDS in wastewater. Over the first 7 days, TDS increased significantly (from 1200 ppm to 1500 ppm), while other parameters like COD, nitrate, phosphate, TSS, and turbidity decreased. Between days 8 to 10, TDS began to slowly decrease (by 30-40 ppm per day). Based on biochemical processes or plant absorption mechanisms, what could explain these results in my phytoremediation experiment?

TDS

Araceae

Phytoremediation

Nitrate

Phosphates

Ketul Kumawat

Jai Narain Vyas University

Phytoremediation uses plants to reduce Total Dissolved Solids (TDS) in wastewater by absorbing, accumulating, or precipitating salts and dissolved ions. Specific plants like cattails, water hyacinths, and vetiver grass are effective in this process. These plants improve water quality by reducing salinity and mineral content. It's an eco-friendly, cost-effective method for wastewater treatment.