title: Programmed gradient descent biosorption of strontium ions by Saccaromyces cerevisiae and ashing analysis: A decrement solution for nuclide and heavy metal disposal.
abstract: One of the waste disposal principles is decrement. The programmed gradient descent biosorption of strontium ions by Saccaromyces cerevisiae regarding bioremoval and ashing process for decrement were studied in present research. The results indicated that S. cerevisiae cells showed valid biosorption for strontium ions with greater than 90% bioremoval efficiency for high concentration strontium ions under batch culture conditions. The S. cerevisiae cells bioaccumulated approximately 10% of strontium ions in the cytoplasm besides adsorbing 90% strontium ions on cell wall. The programmed gradient descent biosorption presented good performance with a nearly 100% bioremoval ratio for low concentration strontium ions after 3 cycles. The ashing process resulted in a huge volume and weight reduction ratio as well as enrichment for strontium in the ash. XRD results showed that SrSO4 existed in ash. Simulated experiments proved that sulfate could adjust the precipitation of strontium ions. Finally, we proposed a technological flow process that combined the programmed gradient descent biosorption and ashing, which could yield great decrement and allow the supernatant to meet discharge standard. This technological flow process may be beneficial for nuclides and heavy metal disposal treatment in many fields.
authors.affiliation: Life Science and Engineering College, Southwest University of Science and Technology, Mianyang, 621010, China; Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education of China, Mianyang, 621010, China.
authors.forename: Mingxue
authors.initials: M
authors.lastname: Liu
authors.affiliation: Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education of China, Mianyang, 621010, China. Electronic address: fqdong@swust.edu.cn.
authors.forename: Faqin
authors.initials: F
authors.lastname: Dong
authors.affiliation: Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education of China, Mianyang, 621010, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Mianyang, 621010, China.
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Nie
authors.affiliation: Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education of China, Mianyang, 621010, China.
authors.forename: Shiyong
authors.initials: S
authors.lastname: Sun
authors.affiliation: Life Science and Engineering College, Southwest University of Science and Technology, Mianyang, 621010, China.
authors.forename: Hongfu
authors.initials: H
authors.lastname: Wei
authors.affiliation: Life Science and Engineering College, Southwest University of Science and Technology, Mianyang, 621010, China.
authors.forename: Lang
authors.initials: L
authors.lastname: Luo
authors.affiliation: Life Science and Engineering College, Southwest University of Science and Technology, Mianyang, 621010, China.
authors.forename: Sha
authors.initials: S
authors.lastname: Xiang
authors.affiliation: Life Science and Engineering College, Southwest University of Science and Technology, Mianyang, 621010, China.
authors.forename: Gege
authors.initials: G
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D007477:Ions; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D013324:Strontium / Q000378:metabolism*
chemical_list: D007477:Ions; D013324:Strontium
keywords: Ashing; Biosorption; Decrement; Programmed gradient descent; Strontium (Sr)