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Coexistence of transition metal ions on the adsorption of chromium yeast flocculation effect

Author: LiZhiGang
Tutor: ChenLiJie
School: Dalian University of Technology
Course: Biological Engineering
Keywords: Flocculating yeast Ni2, Cu2, Zn2 Cr (Ⅵ) reduction Cr (Ⅲ) adsorption Yeast cycle
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 15
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Abstract


Recent years due to industrialization and urbanization continues to accelerate and in-depth, a lot of industrial and municipal wastewater discharges, lead us to serious degradation of the aquatic environment into biogeochemical cycling of toxic heavy metals in a substantial increase; addition, a large number of heavy metal emissions to the aquatic and terrestrial ecosystems, to pass through the food chain has been a serious threat to aquatic life and human health. Chromium is a typical heavy metal pollutants in the environment mainly trivalent Cr hexavalent based compounds, usually in Cr3, CrO2-, CrO42-, Cr2O72-plasma exists in the form of chromium toxicity is determined by its valence decision, Cr (Ⅵ) toxicity is Cr (Ⅲ) more than 100 times. Electroplating industry is one of the major industries heavy metal pollution, while containing Cr (Ⅵ) in electroplating industry wastewater is a major water source. The topics to flocculating yeast SPSCO1 as research object, the presence of coexisting ions, their reduction Cr (Ⅵ) and adsorption Cr (Ⅲ) as well as the impact of yeast recycling. The results show that: In the binary system Ni2, Zn2 presence of flocculating yeast SPSCO1 reduction Cr (Ⅵ) plays an inhibitory effect, and with the increase of its concentration, inhibition growing; compare the two and found that Zn2 than Ni2 have a stronger inhibitory effect; low concentration (25 mg / L) Cu2 presence of flocculating yeast SPSCO1 reduction Cr (Ⅵ) played a catalytic role, completely restore times by a single Cr (Ⅵ) system to shorten the time about 12h to 8h around . Ni2, Zn2 presence of total chromium removal decreased; Cu2 existence but got the opposite result. Broken yeast cells after adsorption, separation determine its chromium content of each component, the results validate the Cu2 for total chromium removal role in promoting. By examining the balance after the flocculation of yeast flocculation ability to find different systems yeast SPSCO1 settlement rate can reach 95%. By monitoring changes in the ORP system and Fourier transform infrared spectroscopy (FTIR) analysis, the results showed that: the presence of coexisting ions not only affects the whole system ORP changes and different ion adsorption sites on the cell surface of different roles. The presence of coexisting ions adsorbed flocculating yeast SPSCO1 Cr (Ⅲ) has played an inhibitory effect, but because of the different nature of the ionic strength of the interaction will produce differences; isolated cells of each component, found Ni2, Cu2, Zn2 presence also affect cell components for Cr (Ⅲ) adsorption; by infrared analysis, we found Ni2, Cu2, Zn2 presence both on the yeast cell surface adsorption sites have had a certain impact. In the study of yeast SPSCO1 desorption and recycling, we found that 0.5 M NaHCO3 at room temperature (25 ℃) conditions can play a very good desorption, flocculation of yeast SPSCO1 recycled five times for Cr (Ⅵ) were more than 90% can be achieved removal, indicating a high value of regeneration and recycling performance.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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