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Song X.,Guangdong University of Technology | Fan D.,South China Institute of Environment science | Xu W.,Guangdong University of Technology
Chinese Journal of Environmental Engineering | Year: 2014

In order to establish the road traffic noise prediction model in Guangdong, we made a in-depth analysis of FHWA model based on the related studying achievement by domestic scholars, and introduced the concept of equivalent traffic flow to simplify model according to the principles of the traffic noise prediction, then made the multiple linear regression analysis of the measured sample data from the chosen urban roads and highways in Guangdong. It is validated that the model can be used in the appraisals for noise pollution forecasting accurately. This method is worth recommending and applying in processing of traffic noise problems all over China. ©, 2014, Science Press. All right reserved.


Tang Y.,Hunan University | Tang Y.,South China Institute of Environment science | Li X.-M.,Hunan University | Xu Z.-C.,South China Institute of Environment science | And 3 more authors.
Biotechnology and Applied Biochemistry | Year: 2014

Naproxen and bezafibrate fall into the category of pharmaceuticals that have been widely detected in the aquatic environment, and one of the major sources is the effluent discharge from wastewater treatment plants. This study investigated the sorption and degradation kinetics of naproxen and bezafibrate in the presence of activated sludge under aerobic conditions. Experimental results indicated that the adsorption of pharmaceuticals by activated sludge was rapid, and the relative adsorbabilities of the two-target compounds were based on their log Kow and pKa values. The adsorption data could be well interpreted by the pseudo-second-order kinetic model. The degradation process could be described by the pseudo-first-order kinetic model, whereas the pseudo-second-order kinetics were also well suited to describe the degradation process of the selected compounds at low concentrations. Bezafibrate was more easily degraded by activated sludge compared with naproxen. The spiked concentration of the two-target compounds was negatively correlated with k 1 and k2s, indicating that the substrate inhibition effect occurred at the range of studied concentrations. Chemical oxygen demand (COD) did not associate with naproxen degradation; thus, COD is not an alternative method that could be applied to investigate natural organic matter's impact on degradation of pharmaceuticals by activated sludge. © 2013 International Union of Biochemistry and Molecular Biology, Inc.


Du Q.,University of Science and Technology of China | Peng R.,Sun Yat Sen University | Liu W.,University of Science and Technology of China | Jia X.,Sun Yat Sen University | Wei D.,South China Institute of Environment science
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2012

Tetrabromobisphenol A (TBBPA) is a widely used brominated flame retardant that is present widely in the environment. The developmental toxicity effects of TBBPA on the zebrafish (Danio rerio) embryos were studied both in vitro and in vivo. The results showed that exposure to water-borne TBBPA would cause teratogenic effects and death of zebrafish embryos. The teratogenic defects included pericardial edema, hemoglutinations and axial malformation. The lethality rate significantly increased when the embryos were treated with higher concentrations of TBBPA. Furthermore, the death of zebrafish embryos mainly happened in 24 h post-fertilization (hpf). The zebrafish embryos exposed to 6.4 mg·L -1 TBBPA were all dead during 48 hpf. The activities of spontaneous movement of zebrafish embryos exposed to different TBBPA concentrations higher than 0.4 mg·L -1 decreased in 20s. The main toxic effect to the embryos in 48 hpf was pericardial edema. No difference in the heart rates of embryos was observed between the control group and treated groups. The main toxic effect for the embryos in 72 h was pericardial edema and curved trunk. The hatching rates and survival rates were significantly decreased. These results suggested that TBBPA in the water were toxic directly to zebrafish embryos' early development in a dose-response manner. The lethality of offspring embryos was increased at the endpoints of 24 h and 72 h in a time-response manner when the adult zebrafish were exposed to 1.5 mg·L -1 TBBPA for 3~7 days. The lethality rate showed significant difference in 72 hpf between TBBPA treated groups and the control group in vivo. The hatching rates of offspring embryos decreased when adult zebrafish were treated with TBBPA, however, no significant difference was observed. The teratogenesis rates of offspring embryos significantly increased, and showed marked difference between the treated groups and the control groups. The results indicated that TBBPA residue in water was potentially hazardous to the development of fishes.


Tang Y.,South China Institute of Environment science | Tang Y.,Hunan University | Xu Z.-C.,South China Institute of Environment science | Guo Q.-W.,South China Institute of Environment science | And 4 more authors.
Proceedings - 2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012 | Year: 2012

A scoping investigation was carried out to evaluate the occurrence, persistence and fate of a range of pharmaceuticals and personal care products (PPCPs) at different processing points at three full-scale sewage treatment plants (STPs) at Guangdong, South China. The concentrations of 7 pharmaceuticals from non-steroidal anti-inflammatory analgesics and antihyperlipidemics were examined in each treatment stages in STP3. And one anti-biotic was examined the removal efficiencies in three STPs. Salicylic acid was the most abundant analyte in the three STPs influent, up to ppb magnitude, followed by ibuprofen, diclofenac, naproxen, gemfibrozil, mefenamic acid and clofibric acid. The concentration of salicylic acid, ibuprofen, diclofenac, naproxen and gemfibrozil decreased at least by one order of magnitude after biological treatments. Mefenamic acid and clofibric acid were found not apparent removal efficiencies during these stages, which could indicate lower biodegradability. The different results of triclosan (TCS) removal were appeared in three sewage treatment plants, 79.46%, 64.11% and 31.95%, respectively. Now, the existing sewage treatment system only dependent on the activated sludge secondary treatment can not completely remove PPCPs. © 2012 IEEE.

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