Open AccessBiosorption of Cd (II) by Yeasts from Ripe Fruit Peels in the Philippines
Author(s) -
Jovy Ann Casamorin,
Reuel M. Bennett,
Gina R. Dedeles
Publication year - 2014
Publication title -
journal of health and pollution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.412
H-Index - 9
ISSN - 2156-9614
DOI - 10.5696/2156-9614-4-7.14
Subject(s) - biosorption , cadmium , chemistry , environmental chemistry , wastewater , pulp and paper industry , nuclear chemistry , environmental engineering , environmental science , adsorption , sorption , engineering , organic chemistry
Background. Industrial waste produced from raw-material processing and manufacturing is mostly metallic in nature. In the Philippines, cadmium (Cd) monitoring in drinking water is used as a parameter for water quality testing. Cadmium in drinking water comes mainly from the dissolution of Cd ions from plumbing materials and by-products of mining, electroplating, and other industrial operations.Objective. The biosorption potential of heat-killed yeast biomass from ripe fruit peels was studied for cadmium in oxidative state 2 at concentrations of 12, 20, and 35 mg/L.Methods. Maximum biosorption of Cd (II) for the 3 Candida species was attained at pH 6 using 10 mg of the sorbent dosage of each species for 1 hour at 30 mg/kg Cd (II). Biosorption of Cd (II) and other heavy metals such as chromium, lead and copper was measured in microcosm using filter-sterilized water samples from the Marilao River in Bulacan Province.Results. Of the 41 yeast isolates evaluated for their tolerance to various Cd (II) concentrations, 3 species of Candida [C. guilliermondii B1, C. lusitaniae B3, and 6 strains of C. famata (B9, B13, B15, B16, P29, and P33)] tolerated 230 mg/L Cd (II). Biosorption ability was dependent on pH, sorbent dosage, contact time, and increasing metal concentration. Results showed that the 3 Candida spp. absorbed mostly chromium, as it was the metal present in the highest concentration in the solution.Conclusions. The ability of dead yeast cells to absorb metals indicates the possibility that these organisms can be used for treating wastewater, especially in developing countries like the Philippines.Competing Interests. The authors declare no competing financial interests