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Gao Y.,Zhejiang University of Technology | Shen T.-D.,Zhejiang University of Technology | Chen Y.,Zhejiang University of Technology | Zhou H.-H.,Institute of Zhejiang Environmental Protection Design and Research Co. | Tong S.-P.,Zhejiang University of Technology
Huanjing Kexue/Environmental Science | Year: 2014

The degradation efficiencies of dimethyl phthalate(DMP) by O3, O3/H2O2, Ti(IV)/O3 and Ti(IV)/O3/H2O2 were investigated under acidic conditions. The results indicated that Ti(IV)/O3/H2O2 was the best system with the highest degradation efficiency and mineralization rate of DMP, and the highest utilization rate of ozone at pH 2.8. The apparent rate constants of DMP degradation by O3, O3/H2O2, Ti(IV)/O3 and Ti(IV)/O3/H2O2 under the same conditions were 3.96×10-4 s-1, 9.54×10-4 s-1, 1.07×10-3 s-1 and 6.41×10-3 s-1, respectively. The ozone utilization rate of Ti(IV)/O3/H2O2 was improved by 6.51% compared with that of ozonation alone. The experimental results showed that the optimized concentrations of Ti(IV) and H2O2 were 1.4mg·L-1 and 10mg·L-1, respectively. According to the results of gas chromatography-mass spectrometry(GC/MS) and ion chromatography analysis, the possible reaction pathway of DMP degradation by Ti(IV)/O3/H2O2 was proposed and discussed. Source


Wang H.,Zhejiang GongShang University | Wang H.,Institute of Zhejiang Environmental Protection Design and Research Co. | Xie X.-Y.,Institute of Zhejiang Environmental Protection Design and Research Co.
Huanjing Kexue/Environmental Science | Year: 2014

Recently, soil heavy metal contamination becomes more and more serious in certain areas in China. Adverse effect caused by heavy metals in contaminated soils has been a wide concern for many years. In this study, a bioassay experiment with the earthworm (Eisenia foetida) was conducted to investigate the effects of compound application of Cd, Cu and Pb in soil on surperoxide dismutase (SOD), glutathione S-transferase(GST) and acid phosphatase(AP) activity in earthworms. Through a method of greenhouse soil experiment, this study utilized a uniform design method of three factors and six levels (Cd: 0-15 mg·kg-1, Cu: 0-175 mg·kg-1, Pb: 0-600 mg·kg-1) to research the physiological property and enrichment characteristics of earthworm in soils with Cd, Cu and Pb compound pollution. The activity of SOD, GST and AP were inhibited significantly under Cd, Cu and Pb compound pollution. And they were impacted by both time and heavy metal contents in the soil. Compared with the control sample, the activity of SOD increased by 7.4%-240.5% in the first eight days under the stress of heavy metals. But owing to the extremely severe stress, it was suppressed and descended by 19.4%-69.7%. Compared with the control sample, the activity of GST increased by 104.3%-217.3% in the first sixteen days under the stress of heavy metals. But owing to the extremely severe stress, it was suppressed and descended by 1.2%-40.3%. The activity of AP changed over time in a trend of “increase, decrease, increase, decrease”. Compared with the control sample, the activity of AP decreased by 9.2%-37.8% in the first eight days, then increased by 37.2%-117.2% in sixteenth days and decreased by 24.3%-34.0% to the last day. The analysis demonstrates that Pb and Cd-Cu-Pb is the dominant factor to the activity of SOD, while Cd and Cu were the dominant factors to the activity of GST and AP. Source


Chen Y.,Zhejiang GongShang University | Huang F.,Zhejiang GongShang University | Xie X.-Y.,Institute of Zhejiang Environmental Protection Design and Research Co.
Huanjing Kexue/Environmental Science | Year: 2014

An Acidithiobacillus ferrooxidans strain WZ-1 (GenBank sequence number: JQ968461) was used as the research object. The effects of Cl-, NO3-, F- and 4 kinds of simulated inorganic anions leaching solutions of electroplating sludge on the bioactivity of Fe2+ oxidation and apparent respiratory rate of WZ-1 were investigated. The results showed that Cl-, NO3- didn't have any influence on the bioactivity of WZ-1 at concentrations of 5.0 g·L-1, 1.0 g·L-1, respectively. WZ-1 showed tolerance to high levels of Cl- and NO3- (about 10.0 g·L-1, 5.0 g·L-1, respectively), but it had lower tolerance to F- (25 mg·L-1). Different kinds of simulated inorganic anions leaching solutions of electroplating sludge had significant differences in terms of their effects on bioactivity of WZ-1 with a sequence of Cl-/NO3-/ F-≥NO3-/ F->Cl-/ F->Cl-/NO3-. Source


Zhou H.-H.,Zhejiang GongShang University | Zhou H.-H.,Institute of Zhejiang Environmental Protection Design and Research Co. | Song X.-G.,Zhejiang GongShang University | Song X.-G.,Institute of Zhejiang Environmental Protection Design and Research Co. | And 2 more authors.
Huanjing Kexue/Environmental Science | Year: 2013

A micro power turbine water aeration system with a water biological base and a sediment biological base was independently developed, aimed at urban water eutrophication. The results showed that the average removal rates of COD, NH4 +-N, TP by the water biological base were 82.33%, 98.00% and 54.73%, respectively; The sediment reduction rate achieved by the sediment biological base could reach 20% within 5 days, and aeration in the overlying water could relieve the nutrient releasing caused by the degradation of organic matter; The effect of nutrient removal and organic matter reduction in sediment by the combined ecological restoration technology was perfect in pilot scale. The average removal rates of COD, NH4 +-N, TP were 52.0%, 33.6% and 23.4%, respectively, and the organic content in sediment was reduced from 38.20% to 12.20%. Source

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