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1

River health evaluation based on the fuzzy matter-element extension assessment model

100%
Xu W., Dong Z., Hao Z., Li D., Ren L.
Polish Journal of Environmental Studies
|
2017
|
tom 26
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nr 3
The measured values of river health indexes that are not necessarily in the same range of a certain health grade level cause the problem of how to classify the actual status of river health. To solve such incompatibility and evaluate the health condition of a river ecosystem objectively we can use the river health integrated index (RHI), which was determined by the fuzzy matter-element extension assessment model (FMEAM). FMEAM was established by combining the fuzzy matter-element extension assessment method with the proposed aggregative index system. By employing the model above, as well as data from the 1980s, 1990s, and 2000s, we evaluated the health state of the Luanhe River. The results showed that the Luanhe River was in a sub-healthy state in the 1980s and in an unhealthy state in the 1990s and 2000s. The reasons leading to the Luanhe River’s health degradation have been analyzed. Among them, water conservation projects’ building and operations are the major influence factors. Waste water emissions, the expansion of urban built-up areas, over exploitation of groundwater, and other unreasonable human activities also intensified the river ecosystem degradation. Finally, countermeasures for the ecological restoration and protection of the river were put forward.
2

Preparing γ-cyclodextrin-immobilized starch and the study of its removal properties to dyestuff from wastewater

100%
Hao Z., Yi Z., Bowen C., Yaxing L., Sheng Z.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 3
A novel natural polymeric adsorbing material γ-cyclodextrin immobilized starch (CS-γCD) was prepared by introducing host functional molecule γ-cyclodextrin (γ-CD) into starch, using epichlorohydrin (ECH) as a cross-linking agent and sodium hydroxide as a catalyst, via the aqueous-phase synthesis method. The γ-cyclodextrin content in CS-γCD was up to 8.15% determined by the bromocresol green (BCG) hyperchromic spectrophotometric method. The structures of CS-γCD were characterized by infrared spectrum (FT-IR), ¹³C-nuclear magnetic resonance spectrum (¹³C-NMR), scanning electron microscope (SEM), x-ray diffraction (XRD), and gel permeation chromatography (GPC). We investigated the adsorption performances and kinetics of CS-γCD to three different kinds of dyestuff including methylene blue (MB), methyl purple (MP), and congo red (CR). The results showed the adsorbing capacities of CS-γCD to three kinds of dyes had obviously increased compared with native starch and diatomite, and the CS-γCD was also found to have a significant advantage in adsorption of macro-molecule dye such as CR over other adsorbing materials. The adsorption behaviors of CS-γCD on the three dyestuffs could be better described by a Langmuir model (R²>0.99), but also had relatively high correlation to Freundlich model. The pseudo second-order model could better describe the adsorption behaviors. The CS-γCD could be enzymolysised, while its degradation rate was much lower than native starch, which indicated that CS-γCD had a relatively higher structural stability and longer service life, these characters could be beneficial for the popularization and application of CS-γCD in fields of wastewater treatment and environment remediation.
3

Ecological flow regime and its satisfactory degree assessment based on an integrated method

86%
Wei X., Dong Z., Hao Z., Ren L., Wang W., Li D.
Polish Journal of Environmental Studies
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2019
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tom 28
|
nr 5
Ecological flow regime (EFR) evaluation is essential in river ecosystem protection. To evaluate and maintain EFR under a changing environment reasonably, an integrated method based on both the monthly 7Q10 method and biological analysis method was put forward for its simple modelling and small data requirement, and then reasonable EFR was obtained after a reasonable check by the Tennant method. Meanwhile, the concept and quantitative formula of the ecological flow regime satisfactory degree (EFRSD) were recommended and successfully applied in the Luanhe River. The results showed that the flow regime of the Luanhe was significantly interrupted by human activities after 1979, and EFRSD has been distinctly damaged since 1998; after 1979, from good to bad, the EFRSD of the Luanhe was the upstream, midstream and downstream. Then the driving forces leading to the Luanhe’s EFRSD deterioration that included reduction in the natural rainfall, construction and operating of water conservation projects, and overexploitation of groundwater were discussed and analyzed. Finally, countermeasures for the ecological rehabilitation of the river were pertinently put forward.
4

Structural predication and antigenic analysis of Toxoplasma gondii ROP20

59%
Zhou J., Wang W., Song P., Wang L., Han Y., Guo J., Hao Z., Zhu X., Zhou Q., Du X., Lu G., He S., Luo Y.
Acta Parasitologica
|
2018
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tom 63
|
nr 2
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