Biological removal of cadmium by Alcaligenes eutrophus CH34
Journal Title: International Journal of Environmental Science and Technology - Year 2004, Vol 1, Issue 3
Abstract
Some bacteria like the heavy metal resistant Alcaligenes eutrophos CH34 strains are able to promote biomineralization, being the biologically induced crystallization of heavy metals. In the presence of heavy metals, this strain may create an alkaline environment in the periplasmic space and outer cell environment appropriate induction of heavy metals resistance mechanisms. In such an environment metal hydroxides are formed together with metal bicarbonates resulting from the carbonates production by the cell. Also metals bind to out cell membrane proteins and the metal hydroxides and bicarbonates precipitate around these nucleation foci inducing further metal crystallization. A pilot-plant was set up in which Alcaligenes eutrophus CH34 were inoculated and reproduced in a composite membrane, based on polysulfone. The membrane is casted on a polyester support. The biological membrane was in continuous contact with nutrients from inside and the other side was in contact with wastewater flow containing 120-mg/l cadmium. Nutrients are used for growth and reproduction of bacteria and for development of bacteria resistance agents against heavy metals. At the effluent side immobilized bacteria induce metal precipitation and metal crystals. A column, which was in continuous contact with treated effluent, was continuously filled with glass bends to which the metal crystals bind and grow. The efficiency for Cd removal was over 99 percent. Cd removal could be recovered from the recuperation column by acid treatment without damaging the bacteria.
Authors and Affiliations
A. H. Mahvi, L. Diels
Keywords
Related Articles
- EP ID EP82681
- DOI -
- Views 92
- Downloads 0
Lead remediation of contaminated water using Moringa Stenopetala and Moringa oleifera seed powder
The increasing influx of heavy metals into water bodies from industrial, agricultural, and domestic activities is of global concern because of their well documented negative effects on human and ecosystem health. A recen...
Ambient air quality of Kathmandu valley as reflected by atmospheric particulate matter concentrations (PM10)
This paper presents the analysis and interpretation of ambient particulate matter concentrations measured as PM10 at a network of six air monitoring stations in Kathmandu valley during the years, 2003 through 2005. The p...
Pollution of south of Tehran ground waters with heavy metals
The reuse of nutrients and organic matter in wastewater sludge via on agricultural lands application is a desirable goal. However, trace or heavy metals present in sludge pose the risk of human or phytotoxicity from land...
Induced mutation and in vitro techniques as a method to induce salt tolerance in Basmati rice (Oryza sativa L.)<br />
Embryogenic callus of indica rice (Oryza sativa L.) cv. Basmati 370 induced on MS medium containing 9.05 M 2, 4-D was irradiated at 50 Gy of gamma rays of 60Co for creating genetic variability against salinity. Irradiat...
Kinetics of batch microbial degradation of phenols by indigenous seudomonas fluorescence
he potential of various organisms to metabolize organic compounds has been observed to be a potentially effective means in disposing of hazardous and toxic wastes. Phenols and their compounds have long been recognized as...