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Hu W.,South China University of Technology | Hu W.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Wu C.,South China University of Technology | Wu C.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Wu C.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions
Environmental Science and Pollution Research | Year: 2016

The feasibility of using enhanced coagulation, which combined polyaluminum chloride (PAC) with diatomite for improving coagulation performance and reducing the residual aluminum (Al), was discussed. The effects of PAC and diatomite dosage on the coagulation performance and residual Al were mainly investigated. Results demonstrated that the removal efficiencies of turbidity, dissolved organic carbon (DOC), and UV254 were significantly improved by the enhanced coagulation, compared with PAC coagulation alone. Meaningfully, the five forms of residual Al (total Al (TAl), total dissolved Al (TDAl), dissolved organic Al (DOAl), dissolved monomeric Al (DMAl), and dissolved organic monomeric Al (DOMAl)) all had different degrees of reduction in the presence of diatomite and achieved the lowest concentrations (0.185, 0.06, 0.053, 0.014, and 0 mg L−1, respectively) at a PAC dose of 15 mg L−1 and diatomite dose of 40 mg L−1. In addition, when PAC was used as coagulant, the majority of residual Al existed in dissolved form (about 31.14–70.16 %), and the content of DOMAl was small in the DMAl. © 2015, Springer-Verlag Berlin Heidelberg. Source


Niu X.,South China University of Technology | Niu X.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Niu X.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | Wang J.,South China University of Technology | And 5 more authors.
Journal of Soils and Sediments | Year: 2015

Purpose: Phosphine is a significant gaseous carrier in the P cycle. The matrix-bound phosphine in the paddy soils and its relationship to environmental variables and bacterial community composition were studied. Materials and methods: The ambient levels of matrix-bound phosphine (MBP) from four distinct sites in South China were investigated. Molecular fingerprint technology polymerase chain reaction–denaturing gradient gel electrophoresis (PCR-DGGE) was used to further explore the potential connections between MBP and composition of bacterial communities. Results and discussion: The relationship between MBP and environmental factors was analyzed to determine the factors affecting the distribution of MBP. Stepwise regression analysis showed that the pH, phosphatase, and organic matter were among the principal environmental factors of the 18 examined factors affecting the MBP levels in paddy soil and explained 38.2 % (p < 0.05) of the total variance observed by principal component analysis (PCA) and redundancy analysis (RDA) analysis. Conclusions: We found that pH, phosphate, and organic matter had a significant relationship with MBP (p < 0.05). Sequencing results indicated that MBP might have a close relationship with the bacterial community composition. © 2015 Springer-Verlag Berlin Heidelberg Source


Wu L.,South China University of Technology | Wu L.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Wu P.,South China University of Technology | Wu P.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | And 7 more authors.
Research on Chemical Intermediates | Year: 2016

ZnTiO3–TiO2/organic pillared montmorillonite (pMt) composite catalyst was successfully prepared in this paper by immobilizing ZnTiO3–TiO2 onto pMt. The composition and texture of the prepared composite catalyst were characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, energy dispersive spectrometry, ultraviolet–visible light (UV–Vis) diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic activity was tested via photocatalytic degradation of methyl blue (MB) under both visible irradiation and UV light. The results indicated that the ZnTiO3–TiO2/pMt composite catalyst had an apparent absorption at the area of visible irradiation, and exhibited a higher efficiency of photocatalytic degredation of MB under visible irradiation. This was due to the heterostructure of ZnTiO3–TiO2, and the mesoporous structure and specific surface area of the ZnTiO3–TiO2/pMt composite. In addition, the results of the radical scavenging experiments showed that the holes and superoxide radicals are responsible for the degradation of MB under visible irradiation. © 2015, Springer Science+Business Media Dordrecht. Source


Hu W.C.,South China University of Technology | Wu C.D.,South China University of Technology | Wu C.D.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Wu C.D.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | And 2 more authors.
Desalination and Water Treatment | Year: 2015

The feasibility of using O3 pre-oxidation and polyaluminum chloride (PAC)-enhanced coagulation for treating slightly polluted algae-containing raw water of the Pearl River was investigated. Results demonstrated that O3 pre-oxidation and PAC-enhanced coagulation have greatly increased the removal of algae, turbidity, and natural organic material compared with PAC coagulation only. Specifically, the greatest removal of chlorophyll-a (chl-a) and TOC attained 97.67% and 32.29%, respectively, at the O3 concentration of 1.0 mg/L and a PAC dose of 6.0 mg/L. 1.0 mg/L O3 pre-oxidation reduces the 60% PAC dose when the residual turbidities reached 0.99 NTU. 2.0 mg/L O3 pre-oxidation increased the UV254 removal from 16.97 to 57.28% at a PAC dose of 6.0 mg/L. © 2014 Balaban Desalination Publications. All rights reserved. Source


Wang J.,South China University of Technology | Wang J.,Nanjing University | Li L.,South China University of Technology | Niu X.,South China University of Technology | And 3 more authors.
Journal of Soils and Sediments | Year: 2016

Purpose: The aim of this study was to evaluate the role of phosphine in the mobilization of phosphorus in the rhizosphere soil of rice seedlings and to determine the relative efficiency of phosphine in plant P acquisition. Materials and methods: An indoor simulation experiment was conducted and the matrix-bound phosphine (MBP), phosphorus fractions, and phosphatase activity in the rhizosphere soil samples from rice cultivation, biomass, the plant P, and the root system activity were measured under different phosphine concentrations (0, 1.4, 4.2, and 7.0 mg m−3) for a period of 30 days. Results and discussion: The results indicated that phosphine treatments enhanced MBP, inorganic P (resin–Pi, NaHCO3–Pi, and NaOH–Pi), and phosphatase activity, as well as the root system activity, and the content of P in the rice seedlings was stimulated with increasing phosphine concentrations. However, organic P (NaHCO3–Po and NaOH–Po) accumulation occurred in the rhizosphere of the rice seedlings. In addition, the content of organic P in the soil samples decreased with increased phosphine concentration. Conclusions: Therefore, relatively high concentrations of phosphine in paddy field could have a positive impact on the effectiveness of phosphorus in rice plants via influencing the rhizosphere properties. © 2016 Springer-Verlag Berlin Heidelberg Source

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