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Zhang J.,South China University of Technology | Liu S.,South China University of Technology | Li L.,South China University of Technology | Ren Y.,South China University of Technology | And 10 more authors.
Water, Air, and Soil Pollution | Year: 2017

Tetrachlorobisphenol A (TCBPA) is a widely used flame retardant and a potential endocrine disruptor. We estimated the role of the microbial community in degradation of TCBPA in river sediment from the vicinity of an E-waste processing facility. The effects of different anaerobic conditions on degradation efficiency of TCBPA were investigated, and differences in bacterial communities among these conditions were analyzed by 16S ribosomal RNA (rRNA) gene sequencing. The most effective dechlorination of TCBPA occurred under methanogenic conditions followed by electron donor-enhanced conditions and sulfate-reducing conditions with initial sulfate concentrations of 1, 10, and 20 mM. The extent of TCBPA removal under these conditions mentioned above was 65, 44, 43, 23, and 23%, respectively. 16S rRNA gene sequence analysis indicated that five dominant genera in the phylum Chloroflexi and another five species of Bacteroidetes, Chlorobi, and Firmicutes in these five systems were largely involved in TCBPA dechlorination. The initial sample had a total relative abundance of autochtonous potential dechlorinating bacteria of 12%. After 160 days, these values increased to 29–43% under above conditions. Addition of TCBPA decreased bacterial diversity. Efficiency of TCBPA degradation depends on the abundance and metabolism of dechlorinating bacterial guilds. The effectiveness of dechlorinating microbes in degradation of TCBPA was reduced by high sulfate concentrations. © 2017, Springer International Publishing Switzerland.


Liu C.,South China University of Technology | Liu C.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Liu C.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | Niu X.,South China University of Technology | And 4 more authors.
Environmental Science and Pollution Research | Year: 2016

Tetrabromobisphenol A (TBBPA) is one of the most commonly used flame retardants and has become an environmental contaminant worldwide. More data on the basic characteristics of TBBPA are needed to better understand and used to describe its environmental fate. The aim of this study is to investigate the degradation of TBBPA with different degrees of bromination under the atmospheric different environments. TBBPA was removed quickly due to the strong oxidizing ability of ozone in the atmospheric environment. The half-life of TBBPA was approximately 2.5 h when the ozone concentration was 0.3 mg L−1. The degradation reaction rates of TBBPA increase with increasing ozone concentration but decreased with increasing soil depth. When the ozone concentration was 10 mg L−1, the removal rate of TBBPA reached 90.37 % at the soil surface after 2 h. Under UV irradiation, TBBPA was removed quickly, and the photodegradation reactions were faster than with solar irradiation. The conditions of alkaline soil and high ground temperature in the summer were both contributors to the degradation of TBBPA. These results could facilitate the improvement of waste treatment designs and could lead to better predictions of the outcome of TBBPA in the environment. © 2016 Springer-Verlag Berlin Heidelberg


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


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.


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.


Kang C.,South China University of Technology | Wu P.,South China University of Technology | Wu P.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | Wu P.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | And 8 more authors.
World Journal of Microbiology and Biotechnology | Year: 2014

The potential role of parameters in the reduction of hexavalent chromium [Cr(VI)] by Pseudomonas aeruginosa is not well documented. In this study, laboratory batch studies were conducted to assess the effect of a variety of factors, e.g., carbon sources, salinity, initial Cr(VI) concentrations, co-existing ions and a metabolic inhibitor, on microbial Cr(VI) reduction to Cr(III) by P. aeruginosa AB93066. Strain AB93066 tolerated up to 400 mg/L of Cr(VI) in nutrient broth medium compared to only 150 mg/L of Cr(VI) in nutrient agar. This bacteria exhibited different levels of resistance against Pb(II) (200 mg/L), Cd(II) (100 mg/L), Ni(II) (100 mg/L), Cu(II) (100 mg/L), Co(II) (50 mg/L) and Hg(II) (5 mg/L). Cr(VI) reduction was significantly promoted by the addition of glucose and glycerine but was strongly inhibited by the presence of methanol and phenol. The rate of Cr(VI) reduction increased with increasing concentrations of Cr(VI) and then decreased at higher concentrations. The presence of Ni(II) stimulated Cr(VI) reduction, while Pb(II), Co(II) and Cd(II) had adverse impact on reduction ability of this strain. © 2014 Springer Science+Business Media Dordrecht 2014.


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


Nie H.,South China University of Technology | Zhu N.,South China University of Technology | Zhu N.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Zhu N.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | And 5 more authors.
Applied Biochemistry and Biotechnology | Year: 2015

The bioleaching parameters of metal concentrates from waste printed circuit boards by Acidithiobacillus ferrooxidans immobilized on cotton gauze in a two-step reactor were investigated in this study. The results indicated that an average ferrous iron oxidation rate of 0.54 g/(L·h) and a ferrous iron oxidation ratio of 96.90 % were obtained after 12 h at aeration rate of 1 L/min in bio-oxidation reactor. After 96 h, the highest leaching efficiency of copper reached 91.68 % under the conditions of the content of the metal powder 12 g/L, the retention time 6 h, and the aeration rate 1 L/min. The bioleaching efficiency of copper could be above 91.12 % under repeated continuous batch operation. Meanwhile, 95.32 % of zinc, 90.32 % of magnesium, 86.31 % of aluminum, and 59.07 % of nickel were extracted after 96 h. All the findings suggested that the recovery of metal concentrates from waste printed circuit boards via immobilization of A. ferrooxidans on cotton gauze was feasible. © 2015 Springer Science+Business Media New York


Shi C.,South China University of Technology | Zhu N.,South China University of Technology | Zhu N.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Zhu N.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | And 5 more authors.
World Journal of Microbiology and Biotechnology | Year: 2015

The heavy metals content and dewaterability of municipal sewage sludge (MSS) are important parameters affecting its subsequent disposal and land application. Six kinds of inoculums were prepared to examine the characteristics of heavy metals removal and MSS dewaterability improvement in bioleaching processes. The results showed that Cu, Zn and Cd bioleaching efficiencies (12 days) were 81–91, 87–93 and 81–89 %, respectively, which were significantly higher than those of Fe–S control (P < 0.05) and blank control (P < 0.01). The bioleaching boosted by the prepared inoculums could also significantly enhance MSS dewaterability (P < 0.01). The centrifugal dehydration efficiency of MSS rose from 73.00 to 90.00 % at day 12. Microscopic observations and energy dispersive spectrum analysis demonstrated that the dewaterability improvement might be attributed to the changes of sludge structure from flocculent to obvious granular and the formation of secondary minerals mainly consisting of iron, oxygen and sulfur elements. The results above demonstrated that bacterial consortium enriched from acid mine drainage (AMD) was suitable to boost sludge bioleaching for heavy metals removal and dewaterability improvement. It also suggested that the synergy of sulfur/ferrous-oxidizing bacteria (SFOB) enriched from AMD and the cooperation of exogenous and indigenous SFOB significantly promoted bioleaching efficiencies. © 2015, Springer Science+Business Media Dordrecht.


Yang C.,South China University of Technology | Zhu N.,South China University of Technology | Zhu N.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Zhu N.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | And 5 more authors.
Journal of Material Cycles and Waste Management | Year: 2015

The goal of this study is to determine the potential of Acidithiobacillus ferrooxidans strain Z1 in bioleaching of metal concentrates of waste printed circuit boards (PCBs). The influences of initial pH, initial Fe(II) concentration, metal concentrates dosage, inoculation quantity and particle size on the bioleaching process were investigated and optimum conditions were determined. The results showed that 92.57 % copper leaching efficiency was achieved within 78 h in a two-step process, and 85.24 % aluminum and 95.18 % zinc were leached out after 183 h under the optimum conditions of initial pH 2.25, initial Fe(II) 9 g/L, metal concentrates dosage 12 g/L, inoculation quantity 10 % and particle size 0.178–0.250 mm. It demonstrated that metals could be efficiently leached from metal concentrates by Acidithiobacillus ferrooxidans Z1 and the bioleaching period was reduced 81–78 h. Therefore, the strain Acidithiobacillus ferrooxidans Z1 could be suggested as a potential strain to bioleach metals from metal concentrates of waste PCBs. © 2015 Springer Japan

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