Entity

Time filter

Source Type


Ran W.,Nanjing Southeast University | Fu D.,Nanjing Southeast University | Fu D.,Jiangsu Province Engineering Research Center for Water Treatment and Ecological Restoration
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2010

The commonly used chelating agent gallic acid (3, 4, 5-trihydroxybenzoic acid, 5 mmol · kg-1), the surfactant SDS (sodium dodecyl sulfate, 1 mmol · kg-1) and the accumulator Lolium perenne L. were selected for use in pot experiments to investigate the effects of gallic acid and SDS on the subcellular distribution and chemical form of heavy metals in Lolium perenne L. The results showed that dosing with gallic acid enhanced the role of Lolium perenne L. in compartmentalizing cadmium and lead, and depositing zinc. Dosing with both gallic acid and SDS enhanced the compartmentalizing and depositing of cadmium, and depositing of zinc. Adding gallic acid alone increased the uptake of total cadmium by 33.5% and zinc by 6.0%, while the non-labile cadmium and zinc were increased by 6.2% and 6.3%, respectively. By dosing with gallic acid and SDS, the total cadmium increased by 35.6% but zinc dropped by 1.1%; the non-labile cadmium and zinc were increased by 7.2% and 8.6%, respectively, and the chelation of cadmium and zinc was enhanced. The subcellular distribution and chemical form of lead did not change under either set of conditions.


Duan W.,Nanjing Southeast University | Duan W.,An Hui Normal University | Fu D.,Nanjing Southeast University | Fu D.,Jiangsu Province Engineering Research Center for Water Treatment and Ecological Restoration | And 3 more authors.
Fresenius Environmental Bulletin | Year: 2011

In this study, a submerged hybrid dynamic membrane bioreactor (sHDMBR) was developed via adding attapulgite into a submerged dynamic membrane bioreactor (sDMBR). The effect of attapulgite addition on biological removal performance and the characteristics of the sludge were investigated. Results indicated that attapulgite addition is a reliable and effective approach in terms of both membrane fouling mitigation and biological removal improvement. The sHDMBR system with attapulgite addition of 0.5g-L" enhanced the removal of TN and TP by 21% and 25%, respectively, as compared to the sDMBR (without attapulgite addition). Turbidity analysis revealed that attapulgite addition had little effect on the initial formation of dynamic membrane, but alleviated the membrane fouling. The particle size distribution (PSD) of mixed liquors indicated an increase trend in microbial floe size with attapulgite adjunction. Non-conventional analytical method, 3-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy, displayed a significant difference of mixed liquors and permeate samples in the range of large molecules identified in the two bioreactors. The analysis of molecular weight (MW) distribution by gel permeation chromatography (GPC) showed that chromatograms of dissolved organic matters (DOM) in the mixed liquors of the sDMBR had been much higher than those of DOM in the mixed liquors of the sHDMBR. But other small molecules of DOM did not present in the effluent of the sHDMBR. © by PSP.


Zuo X.,Nanjing Southeast University | Zuo X.,Jiangsu Province Engineering Research Center for Water Treatment and Ecological Restoration | Fu D.,Nanjing Southeast University | Fu D.,Jiangsu Province Engineering Research Center for Water Treatment and Ecological Restoration | And 2 more authors.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2011

Based on the monitoring of runoff water quality on the surface of Lukou section of Nanjing Airport Expressway, the distributions of particles with different sizes are evaluated. The emphasis is placed on the variation characteristics of particle size distribution in runoff and the relationship between particle size distribution and pollutants. The impact of temperature and pH on particle size distribution is also explored. The results show that the particles with size less than 75μm are more in the runoff, especially the particles with size from 0.45 to 20μm are much more, being 37.5% of the total particles. The volume of particles with size no more than 75μm fluctuates in the initial 40 min of runoff during smaller rainfall event. During the medium-rainfall event, particle volumes with size less than and equal to 150μm vary obviously in the initial 40 min of runoff. In terms of large rainfall events, particles with size less than and equal to 150μm vary more obviously in the initial 30 min settling. The correlation of smaller particles (≤150μm) with the levels of COD and TP contained in the particles is more significant than that of larger particles (>150μm), and the adsorptive capacity of COD and TP by the particles with sizes of 21 to 75μm is more prominent. Particle distribution with size from 0.45 to 20μm and larger than 300μm is significantly influenced by temperature in runoff. The pH value has a significant impact on the particle distribution with size from 21 to 75μm and from 76 to 150μm.


Zuo X.J.,Nanjing Southeast University | Zuo X.J.,Jiangsu Province Engineering Research Center for Water Treatment and Ecological Restoration | Fu D.F.,Nanjing Southeast University | Fu D.F.,Jiangsu Province Engineering Research Center for Water Treatment and Ecological Restoration | And 2 more authors.
Environmental Science and Pollution Research | Year: 2012

Heavy metal pollution in road runoff had caused widespread concern since the last century. However, there are little references on metal speciation in multiple environmental media (e. g., rain, road sediments, and road runoff). Our research targeted the investigation of metal speciation in rain, road sediments, and runoff; the analysis of speciation variation and mass balance of metals among rain, road sediments, and runoff; the selection of main factors by principal component analysis (PCA); and the establishment of equation to evaluate the impact of rain and road sediments to metals in road runoff. Sequential extraction procedure contains five steps for the chemical fractionation of metals. Flame atomic absorption spectrometry (Shimadzu, AA-6800) was used to determine metal speciation concentration, as well as the total and dissolved fractions. The dissolved fractions for both Cu and Zn were dominant in rain. The speciation distribution of Zn was different from that of Cu in road sediments, while speciation distribution of Zn is similar to that of Cu in runoff. The bound to carbonates for both Cu and Zn in road sediments were prone to be dissolved by rain. The levels of Cu and Zn in runoff were not obviously influenced by rain, but significantly influenced by road sediments. The masses for both Cu and Zn among rain, road sediments, and road runoff approximately meet the mass balance equation for all rainfall patterns. Five principal factors were selected for metal regression equation based on PCA, including rainfall, average rainfall intensity, antecedent dry periods, total suspended particles, and temperature. The established regression equations could be used to predict the effect of road runoff on receiving environments. © 2012 Springer-Verlag.


Zuo X.,Nanjing Southeast University | Zuo X.,Jiangsu Province Engineering Research Center for Water Treatment and Ecological Restoration | Fu D.,Nanjing Southeast University | Fu D.,Jiangsu Province Engineering Research Center for Water Treatment and Ecological Restoration | And 2 more authors.
Water Science and Technology | Year: 2012

A study was performed using a settling column to remove mercury (Hg) from road runoff. The emphasis was placed on the relationship between Hg removal and critical settling velocities, as well as the distribution of total suspended solids (TSS). The impact of rainfall characteristics and temperature on Hg removal was also discussed. Results indicated that Hg removal was significant within the initial 30 min of the settling process. The Hg removal rate increased with the decrease of critical settling velocity, and this trend became gradually significant, which could be used as an important reference for the optimization of sedimentation basin design. Hg removal at different settling times was significantly related to initial distribution of TSS. The impact of rainfall intensity on Hg removal was greater than other parameters of precipitation features, followed by rainfall. In addition, Hg removal was moderately related to temperature. The effect of antecedent dry periods on Hg removal was restricted by rainfall and rainfall intensity. © IWA Publishing 2012.

Discover hidden collaborations