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Jia Y.,Agro Environmental Protection Institute | Jia Y.,Key Laboratory of Production environment | Jia Y.,Huazhong Agricultural University | Tang S.,Agro Environmental Protection Institute | And 9 more authors.
Journal of Hazardous Materials | Year: 2010

The objective of this study was to investigate combined effects of Cd and elevated CO2 on growth, physiological and physiochemical characteristics, elemental compositions in Lolium mutiforum and Lolium perenne grown in soils amended with three Cd concentrations (0, 25, 100mgkg-1) under two CO2 levels (375, 810μLL-1). Elevated CO2 increased net assimilation rate and internal CO2 concentration, and consequently increased total plant biomass by 51 to 31%. At same spiked Cd level, malondialdehyde content in leaves was lower under elevated than under ambient CO2, whereas superoxide dismutase activity was higher. Elevated CO2 decreased Cd, S, and phytochelatin concentrations in roots and shoots to a various degree, depending on plant species and element, but the PC-Cd ratio was not affected. It was concluded that elevated CO2 ameliorated Cd toxicity in both Lolium species under Cd stress, and that the increase of plant biomass and the alleviation of Cd toxicity with elevated CO2 for the Lolium species may be more dependent on increased photosynthesis and enhanced antioxidant capacity. Results of the study may provide insights into the interaction between soil Cd contamination and atmospheric CO2 concentration with regard to plant ability to grow and remove the Cd from soils. © 2010 Elsevier B.V.

An Y.,Agro Environmental Protection Institute | An Y.,Key Laboratory of Production Environment | An Y.,Tianjin Key Laboratory of Agro environment | Zhang K.,Agro Environmental Protection Institute | And 11 more authors.
Desalination | Year: 2011

Membrane fouling is a critical problem for efficient commercialization of nanofiltration plants. A nano-MgO/GAC (Granular Activated Carbon) process was investigated the feasibility of using as pre-treatment for nanofiltration. Based on the results obtained, nano-MgO could decrease 51% of Permanganate Index (CODMn), 60% of the ultraviolet absorbance at 254nm (UVA254), and more than 99% of colony counts within 6h. The pH increased to about 10.30 within only 0.5h and then kept stable in the system containing nano-MgO. In addition, adding GAC led to less organic matters (remaining 4.74mg·L-1 versus 6.80mg·L-1) and bacteria (13CFU·mL-1 versus 15CFU·mL-1) relative to using nano-MgO only. Furthermore, almost all nano-MgO could be adsorbed by the GAC column. The pH value of the effluents from the nano-MgO and GAC was 10.18 and 10.20, respectively, while that of the effluent after KH2PO4 adjustment could keep about 7.10. © 2011 Elsevier B.V.

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