title: A combined biological removal of Cd(2+) from aqueous solutions using Phanerochaete chrysosporium and rice straw.
abstract: The removal of Cd(2+) from aqueous solutions by agricultural residues rice straw combined with white rot fungus Phanerochaete chrysosporium (P. chrysosporium) was investigated. The results showed that over 99% of the total Cd(2+) (initial concentration of 150mgL(-1)) was removed at the optimal operating conditions (pH 5.0 at 35°C). We also found that P. chrysosporium could survive under Cd(2+) stress even with an initial Cd(2+) concentration of 250mgL(-1). But when Cd(2+) concentration increased to 250mgL(-1), fungus growth and reproduction were remarkably restrained, and as a result, Cd(2+) removal dropped to 59.2%. It was observed that the fungus biomass and activities of ligninolytic enzymes decreased at some degree under high concentration of Cd(2+) (above 100mgL(-1)). Also, we found that a moderate Cd(2+) stress (below 150mgL(-1)) could stimulate P. chrysosporium's production of the heavy metals chelator - oxalate. This study will provide useful information for the application of biological removal of heavy metal irons from wastewater.
authors.affiliation: College of Civil Engineering, Guangzhou University, Guangzhou, Guangdong 510006, China.
authors.forename: Meihua
authors.initials: M
authors.lastname: Zhao
authors.affiliation: College of Civil Engineering, Guangzhou University, Guangzhou, Guangdong 510006, China. Electronic address: gdzcs@gzhu.edu.cn.
authors.forename: Chaosheng
authors.initials: C
authors.lastname: Zhang
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China.
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China.
authors.forename: Min
authors.initials: M
authors.lastname: Cheng
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D000383:Agriculture; D001673:Biodegradation, Environmental; D018533:Biomass; D002104:Cadmium / Q000737:chemistry* / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy; D012275:Oryza / Q000737:chemistry / Q000378:metabolism*; D020075:Phanerochaete / Q000187:drug effects / Q000378:metabolism*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Biosorption; Cd(2+); Phanerochaete chrysosporium; Removal; Rice straw; Wastewater