Abstract
Mining industries frequently generates acid mine drainage (AMD) either by its operating or abandoned mines which are often characterized by an elevated levels of certain heavy metals, sulphate, low pH and some other toxic impurities in mine water creates environmental and ecological problems. Present study planned to suggest role of alga Spirogyra verrucosa in Manganese (Mn) removal by biosorption process from the mine water of Manganese mines of Nagpur District, Vidarbha Region, Maharashtra. The biosorption of Mn(II) ions from aqueous solution by using dead green algal (S.verrucosa) biomass was investigated by studying effect of pH, temperature, quantity of biosorbent, contact time as well as initial metal ion concentration. The optimized values obtained with respect to these parameters clearly indicates that pH 5, temperature 30°C, biosorbent quantity 1.0 gm/l, contact time 120 min. and initial metal ion concentration 50mg/l were the basic requirement for the biosorption of Mn(II) ions by dead algal biomass. Also, the biosorption kinetic and isotherm modeling applied to the equilibrium data for biosorption of Mn(II) ions onto alga reveals the fitness of the pseudo-second-order rate expression (R2=0.994) as well as the suitability of Langmuir (R2=0.859) and Freundlich (R2=0.761) isotherm models with an indication of the applicability of this metal ion-dried algal system for removal of Mn(II) ions in a monolayer biosorption as well as heterogenous surface conditions. However, comparatively biosorption equilibrium was better described by Langmuir isotherm model with monolayer biosorption capacity of S.verrucosa biomass 21.80 mg/g. Also, the maximum removal 40.66 mg/g (80.20%) of Mn(II) ion by alga under optimized conditions promises the potential use in mine water treatment technology.
Highlights
With the progress of industrialization and human activities, the threat of the discharge of waste and wastewater containing heavy metals to environment by various industries has tremendously increased (Volesky, 2001)
The purpose of the present study was to find out the biosorption capacity of filamentous green alga, S. verrucosa collected from Manganese mine water
The findings were based on biosorption capacity, equilibrium modeling and kinetic studies
Summary
With the progress of industrialization and human activities, the threat of the discharge of waste and wastewater containing heavy metals to environment by various industries has tremendously increased (Volesky, 2001). Mining industries frequently generates acid mine drainage (AMD) either by its operating or abandoned mines which are often characterized by an elevated levels of certain heavy metals, sulphate, low pH and some other toxic impurities in mine water (Modis et al., 1998) and can cause pollution of surface and ground water as well as surrounding land if not controlled in due course of time. Environmental contamination due to heavy metals leads to the phenomenon of accumulation in food chain and becomes a permanent burden on ecosystems (Bailey et al, 1999) causing serious hazard to human health and other forms of life. Location map of the study area (Source: www.google.com, www.moil.nic.in) protection with respect to the metal bearing effluents discharge in to water bodies and natural streams. Different technologies on assessment of acid mine drainage were proposed by several researcher (Moreno et al, 2001; Mohan and Chander, 2001; Brenner, 2001 and Saha et al, 2002; Morgan et al, 2004)
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