生物法制备聚合硫酸铁及其应用研究_英文_(5)

2546 WANG Hui-min, et al/Trans. Nonferrous Met. Soc. China 21(2011) 2542 2547

applied to treat the lake water, significant COD removal efficiency (above 70%) is found in the pH range of 6.0 10.0 as shown in Fig. 7(a).

For the treatment of the dye wastewater, the decolorization efficiency increases with increasing pH value. At pH above 8, the decolorization efficiency could be up to 90% (see Fig. 7(b)). Considering PFS is a metal ion containing polymer, it contains various high valence polynuclear complex ions and hydroxyl group —OH. Polymers can be generated by the bridging of —OH which interacts with negative charged materials. By controlling pH, the number hydroxyl complexes, distribution, electrical charge and molecular mass can be adjusted to achieve satisfactory results.

The results of the zinc removal efficiency at different pH using the BPFS are shown in Fig. 7(c). As pH increases, the zinc removal efficiency is enhanced. At pH above 8.0, the zinc removal efficiency reaches over 99%.

At the same time, the flocculating effect of BPFS and PFS is compared. The results are shown in Fig. 8.

content of 43.87 45.24 g/L, which can provides high flocculability and weak corrosivity to the reactor.

2) The BPFS is an effective flocculant for water treatment and the removal efficiencies of COD, decolorization and Zn2+ by the BPFS reach above 70%, 90% and 99%, respectively.

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Fig. 8 Comparison of flocculation between PFS and BPFS

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It is shown that compared with the PFS prepared by conventional methods, the BPFS prepared in this study is superior with respect to the turbidity removal and the subsidence effect. This is because BPFS not only has a high degree of polymerization, but also contains microorganisms，which can catalyze the oxidation of organic matter as a condensation nucleus during the flocculating-deposition process. Thus, it is sticky and can improve the coagulation efficiency, resulting in the adsorption of big molecular organic matter.

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4 Conclusions

1) A new preparation method of PFS using T·f bacteria as biocatalyst is developed. The BPFS prepared under the optimum conditions has many advantages over the PFS prepared by conventional methods with high pH of 1.5 2.2, high basicity of 17.5% 22.7% and total iron

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