NGHIÊN CỨU SỬ DỤNG BÈO TẦY (EICHHORNIA CRASSIPES) VÀ CÂY SẬY (PHRAGMITES AUSTRALIS) x ử LÝ NƯỚC BỊ Ô NHIỄM CÁC KIM LOẠI NẶNG, CADIMI (Cd), CHÌ (PB), KẼM (Zn) VÀ ĐỒNG (Cu)
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Abstract
This study carried out experiments to cultivate Water hyacinth and Reed in sample containers containing heavy metal-contaminated water at the following concentrations: 0.5 mg/L Cd, 2 mg/L Pb, 5 mg/L Zn, 5 mg/L Cu. Heavy metal concentrations ỉn sample containers are checked after 5-10-20-30-40 days. The results show that both Water hyacinth and reed are capable o f accumulating heavy metals (Zn. Cd, Pb, Cu). After 20-40 days, the rate o f cleaning o f water hyacinth and reed is almost 80%. The ability to clean the Pb contaminated water o f Water hyacinth is faster than that o f Cd, Zn, Cu polluted water while the ability to clean the Cd contaminated water o f Reed is faster than that ofpolluted water o f Cd, Zn and Cu.
Key words: Water hyacinth, Reed, heavy metal, water pollution.