Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation

Guangzhou, China

Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation

Guangzhou, China
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Liao J.,Jinan University | Liao J.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Jin L.,Jinan University | Jin L.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation
Chinese Journal of Environmental Engineering | Year: 2015

Activated carbon fiber bio-film curtain with dynamic auxiliary was used to simulate the polluted source water in situ restoration. The effects of different temperatures and initial ammonia nitrogen concentrations on the remediation were discussed. The results indicated that the middle temperature was advantageous to the microorganisms on the biodegradation of organic matter and ammonia nitrogen, and low temperature was more conducive to microbial phosphorus removal. At 35℃, the removal efficiencies of CODMn and NH3-N were the best, 90% and 94%, respectively, whereas the highest removal rate of TP could reach 54% at 15℃. Under the different ammonia nitrogen concentrations (1.27,1.68 and 2.54 mg/L),the removal efficiency of CODMn was good and stabilized at approximately 85%. With the increase of initial ammonia nitrogen concentrations, the removal efficiency of NH3-N and TP decreased gradually. The removal rate of NH3-N reduced from 96% to 92%, while the removal rate of TP reduced from 40% to 30%. ©, 2015, Science Press. All right reserved.


Ye J.-S.,Jinan University | Ye J.-S.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Yin H.,Jinan University | Yin H.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | And 9 more authors.
Journal of Hazardous Materials | Year: 2011

An anthracene-degrading strain, identified as Aspergillus fumigatus, showed a favorable ability in degradation of anthracene. The degradation efficiency could be maintained at about 60% after 5 d with initial pH of the medium kept between 5 and 7.5, and the optimal temperature of 30 °C. The activity of this strain was not affected significantly by high salinity. Exploration on co-metabolism showed that the highest degradation efficiency was reached at equal concentration of lactose and anthracene. Excessive carbon source would actually hamper the degradation efficiency. Meanwhile, the strain could utilize some aromatic hydrocarbons such as benzene, toluene, phenol etc. as sole source of carbon and energy, indicating its degradation diversity. Experiments on enzymatic degradation indicated that extracellular enzymes secreted by A. fumigatus could metabolize anthracene effectively, in which the lignin peroxidase may be the most important constituent. Analysis of ion chromatography showed that the release of anions of A. fumigatus was not affected by addition of anthracene. GC-MS analysis revealed that the molecular structure of anthracene changed with the action of the microbe, generating a series of intermediate compounds such as phthalic anhydride, anthrone and anthraquinone by ring-cleavage reactions. © 2010 Elsevier B.V.


Li Q.,Jinan University | Li Q.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Liu Y.,Jinan University | Du Y.,Jinan University | And 4 more authors.
Chemosphere | Year: 2011

Many of the coastal tidal flats in China that were polluted with heavy metals are now being reclaimed for arable land. The safety of these soils for agriculture is of great concern. The present study investigated the sediment chemical properties, concentrations, and speciation of heavy metals at different levels of desalination during a controlled leaching experiment. After leaching with fresh water, the average reductions in the heavy metal species examined in 0-65. cm depth sediment were 32.1% for Pb, 26.2% for Cd, 14.0% for Zn, 13.8% for Cu, and 11.0% for Cr, while the Ni concentration in sediment did not change significantly. The amounts of Cd, Pb, Cr, Cu, and Zn bound to the reducible fraction, the amounts of Cd, Pb, and Zn bound to the exchangeable fraction, the amounts of Pb, Cr, Cu, and Zn associated with the carbonate fraction, and the Cu associated with the oxidizable fraction all decreased significantly. Complexation with salt anions, ion exchange between the cations and the metal ions, removal of SO42-, dissolution of carbonate, and the redox potential variations all contributed to the decreases in Pb, Cd, Zn, Cu, and Cr. These results suggest that leaching with fresh water can also remove a fraction of the heavy metal contamination when it diminishes sediment salinity. © 2010 Elsevier Ltd.


Li Q.,Jinan University | Li Q.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Chen Y.,Jinan University | Chen Y.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | And 10 more authors.
Journal of Hazardous Materials | Year: 2012

The health risks of heavy metals to local residents via consumption of food crops cultivated in the reclaimed soils of the Pearl River Estuary (PRE) were investigated. Soils in the river estuary were found to be significantly contaminated with heavy metals, with mean concentrations of Cd, 0.858; Pb, 48.7; Cr, 112.4; Cu, 57.3; Zn, 210.8; and Ni, 40.0mgkg -1. Rice and root vegetables were also polluted severely. The percentages of rice samples that exceeded the maximum allowable levels were 94.3, 91.4, 88.6, and 17.1% for Pb, Cr, Cd, and Cu, respectively. The accumulation factor (AF) of Cd was the highest compared with the other five metals. The total values of the health risk index (HRI) of Cd and Cu from all the crops were 3.683 and 1.665, respectively. They exceeded considerably the allowable level 1.0. The HRI values of all the metals were mostly from rice consumption. These results suggest that more attention should be directed to the potential health risks of heavy metals to residents living in the tidal flat reclaimed areas. © 2012 Elsevier B.V..


Chen L.-L.,Jinan University | Chen L.-L.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Jin L.-H.,Jinan University | Jin L.-H.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2014

As to characteristics of the nonlinearity of water body eutrophication evaluation system, the randomness of weight assignment and inaccuracy of subordinate function during the process of fuzzy comprehensive evaluation, an improved fuzzy comprehensive evaluation method has been pointed out through improving the traditional fuzzy comprehensive evaluation method, and it has been applied to evaluate degrees of eutrophication of water body in 24representative lakes and reservoirs in China. During the process of improvement, the analytic hierarchy process was combined with principal component analysis by software SPSS16.0 and Yaaph to determine index weights, and the determined evaluation criteria were logarithmically transformed to linear, and also each index membership function of logarithmic and lower semi-trapezoid form corresponding to every trophic levels was generated based on distribution characteristics of detected field data, then the membership degree of each lake or reservoir can be obtained and its eutrophication level can be determined by the principle of maximum membership degree. The result of the improved method has been compared with actual eutrophication status of lakes or reservoirs and evaluated results obtained by present evaluation methods, which shows that the calculating process of the improved method is simple, and its result is true and accurate, thus the method is feasible and practical. ©, 2014, Chinese Society for Environmental Sciences. All right reserved.


Li Q.,Jinan University | Li Q.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Chen X.,Jinan University | Chen X.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | And 9 more authors.
Ecotoxicology and Environmental Safety | Year: 2012

The phytoavailability of Cd, Pb, Cr, Zn, Cu, and Ni, retained in tidal flat soil after fresh water leaching during reclamation was investigated. Two salt-tolerant varieties of tomato (Lycopersicon esculentum) and edible amaranth (Amaranthus mangostanus L.) were planted in soils having eight different desalination levels (from 6.7 to 1.4gkg -1 salinity) using pot experiments. Soil leaching significantly decreased the uptake of all metals by crop roots except for Ni. The reduction of soil salinity and exchangeable fraction content of Cd and Pb after leaching contributed to the decrease of uptake of metals by roots. All heavy metal concentrations in the edible parts of both crops in the two lowest salinity level treatments were lower than their maximum allowable levels in food. Results suggest that reclamation of tidal flats can reduce the phytoavailability of the heavy metals retained in soil. But the soil heavy metals may still pose health risks in the cultivation of root food crops. © 2012 Elsevier Inc.


Song L.,Jinan University | Song L.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Zhang X.,Jinan University | Zhang X.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | And 2 more authors.
Reaction Kinetics, Mechanisms and Catalysis | Year: 2011

Polymer-modified TiO2 was found to be a new, efficient photocatalyst for the photodegradation of organic pollutants. Another novel sensitizer-poly(fluorene-co-bithiophene) (PFB) was presented in this study. Varying the bithiophene content of PFB from 10, 20, 33, 40 to 50% in molar ratio, a series of copolymers (PFB10, PFB20, PFB33, PFB40 and PFB50) were prepared and used as the sensitizers for TiO2. The photodegradation rates of phenol catalyzed by these polymer-modified titanium dioxide composites under the irradiation of the GaN LED clusters were investigated. It was found that PFB33-modified TiO2 was the most efficient photocatalyst although the absorption spectrum of PFB50 was broader than that of PFB33. © 2011 Akadémiai Kiadó, Budapest, Hungary.


Mei X.,Jinan University | Mei X.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Li S.,Jinan University | Li S.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | And 11 more authors.
Ecotoxicology and Environmental Safety | Year: 2014

Soil salinity is known to enhance cadmium (Cd) accumulation in crops. However, the mechanism by which this occurs independent of the surrounding soil remains unclear. In this study, root adsorption and uptake of salt cations and Cd by edible amaranth under NaCl salinity stress were investigated in hydroponic cultures with 0, 40, 80, 120, and 160mM of NaCl and 27nM Cd. The dominant Cd species in the nutrient solution changed from free Cd2+ to Cd chlorocomplexes as NaCl salinity increased. High salinity significantly reduced K, Ca, and Cd root adsorption and K, Ca, Mg, and Cd uptake. High salinity decreased root adsorption of Cd by 43 and 58 percent and Cd uptake by 32 and 36 percent in salt-tolerant and salt-sensitive cultivars, respectively. Transformation of Cd from free ion to chlorocomplexes is unlikely to have significantly affected Cd uptake by the plant because of the very low Cd concentrations involved. Application of Ca ion channel blocker significantly reduced Na, K, Ca, Mg, and Cd uptake by the roots, while blocking K ion channels significantly reduced Na and K uptake but not Ca, Mg, and Cd uptake. These results suggest that Na was absorbed by the roots through both Ca and K ion channels, while Cd was absorbed by the roots mainly through Ca ion channels and not K ion channels. Salinity caused a greater degree of reduction in Cd adsorption and uptake in the salt-sensitive cultivar than in the salt-tolerant cultivar. Thus, competition between Na and Cd for Ca ion channels can reduce Cd uptake at very low Cd concentrations in the nutrient solution. © 2014 Elsevier Inc.


Wang L.,Jinan University | Wang L.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Ye M.,Jinan University | Ye M.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | And 6 more authors.
Chinese Geographical Science | Year: 2013

Phosphorus fractions and adsorption-release characteristics of sediments in the Zhujiang (Pearl) River estuary wetland were investigated. Results showed that the total phosphorus (TP) content in surface sediments ranged from 648.9 mg/kg to 1064.0 mg/kg; inorganic phosphorus (IP) was the major fraction of TP and ranged from 422.5 mg/kg to 643.9 mg/kg. Among the inorganic phosphorus, the main fractions were phosphorus bound to Al and Fe (Fe/Al-P), and calcium-bound phosphorus (Ca-P), accounting for 23%-42% and 21%-67% of IP, respectively. The vertical distribution of TP contents were significantly positive correlated with organic phosphorus (Org-P) and Fe/Al-P contents. The bio-available phosphorus contents in vertical sediments varied from 128.6 mg/kg to 442.9 mg/kg, mainly existed in Fe-Al/P fraction, and increased from the bottom to top sediments. The transport of phosphorus in sediment-water interface was controlled by the soil characteristics. The active Fe and Al content was considered as the main factor that determines adsorption capacity in vegetated marsh wetland. The P buffering capacity of the sediments in vegetated marsh wetland was greater than that in mudflat wetland. The potential risk of eutrophication in the study area is high. Reducing terrestrial phosphorus discharge and preventing the sediment Fe/Al-P release to the interstitial water are the possible solutions to reduce the risk of eutrophication in estuary wetlands, and planting vegetation in estuary wetland can also reduce the release of phosphorus in surface sediment. © 2013 Science Press, Northeast Institute of Geography and Agricultural Ecology, CAS and Springer-Verlag Berlin Heidelberg.


Liu Y.,Jinan University | Liu Y.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | Li M.,Jinan University | Li M.,Key Laboratory of Water Soil Toxic Pollutants Control and Bioremediation | And 4 more authors.
Chemistry Bulletin / Huaxue Tongbao | Year: 2011

The removal of cyanide from micro-polluted waters by K2FeO 4 was studied. The effect of pH, temperature, reaction time, dosage of Ferrate (VI), initial cyanide concentration on the cyanide removal was investigated and the mechanism of cyanide removal was discussed. The results showed that, within the pH ranges of 7 ∼ 10. 5 , the removal efficiency of cyanide increased as the pH became larger, while the effect of temperature was not obvious. Under the condition that the pH =9. 0, the oxidation time is 10min, and the initial cyanide concentration is 0. 25mg/L in the raw water, 2. 5mg/L (K2FeO4= CN- = 10: 1 ) ferrate( VI) can reduce the residual concentration of cyanide to lower than 0. 05mg/L, which satisfied the requirement of water quality standard for " drinking water health standards" (GB 5749 -2006). Changing the initial concentration of cyanide, the dosage of ferrate(VI) should be raised to keep high removal efficiency of cyanide.

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