Selection of adsorbents for treatment of leachate: batch studies of simultaneous adsorption of heavy metals |
| |
Authors: | Ülis Sõukand Pille Kängsepp Rutt Kakum Toomas Tenno Lennart Mathiasson William Hogland |
| |
Institution: | (1) Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Catalonia, Spain;(2) Departamento de Ciencias Agroforestales, Universidad de Sevilla, EUITA, Ctra. Utrera, Km. 1, 41013 Sevilla, Spain |
| |
Abstract: | The simultaneous adsorption of copper (Cu), cadmium (Cd), nickel (Ni), and lead (Pb) ions from spiked deionized water and
spiked leachate onto natural materials (peat A and B), by-product or waste materials (carbon-containing ash, paper pellets,
pine bark, and semi-coke), and synthetic materials (based on urea-formaldehyde resins, called blue and red adsorbents) or
mixtures thereof was investigated. The adsorbents that gave the highest metal removal efficiencies were peat A, a mixture
of peat B and carbon-containing ash, and a mixture of peat A and blue. At an initial concentration of 5 mg/l for each metal,
the removal of each species of metal ion from spiked water and spiked leachate solutions was very good (>90%) and good (>75%),
respectively. When the initial concentration of each metal in the solutions was twenty times higher (100 mg/l), there was
a noticeable decrease in the removal efficiency of Cu2+, Cd2+, and Ni2+, but not of Pb2+. Langmuir monolayer adsorption capacities, qm, on peat A were found to be 0.57, 0.37, and 0.36 mmol/g for Pb2+, Cd2+, and Ni2+, respectively. The order of metal adsorption capacity on peat A was the same in the case of competitive multimetal adsorption
conditions as it was for single-element adsorption, namely Pb2+ > Cd2+ ≥ Ni2+. The results show that peat alone (an inexpensive adsorbent) is a good adsorbent for heavy metal ions. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|