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Leaching of heavy metals from MSWI fly ash : experiments vs. simulation

100%

Qiu Q. , Jiang X. , Chen Z. , Lu S. , Ni M.

Archives of Environmental Protection

2018

tom Vol. 44, no. 2

55--61

In this work, pH-dependence experiments and leaching modeling using Visual MINTEQ were performed to evaluate the stability and simulate the leaching characteristics of heavy metals in municipal solid waste incineration (MSWI) fly ash. Modeling the equilibrium concentration of Cd, Cu, Cr, Ni, Pb and Zn in raw and treated fly ash was the main target and was conducted over a pH range of 0.5–14. In addition, simulation of the leaching behavior of MSWI fly ash with different additives was also conducted. The treated fly ash was solidified by a microwave-assisted hydrothermal process with added phosphate. The initial elemental concentrations of MSWI fly ash, including raw and treated fly ash, were detected by a microwave apparatus and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The ICP-AES analysis showed that most leaching concentrations of treated fly ash decreased considerably compared to the raw fly ash. The simulation results indicated that the dissolution/precipitation simulation models of Zn, Cu and Pb were broadly consistent with the experimental results, while the leaching behaviors of Ni, Cr and Cd were determined by both dissolution/precipitation and surface complexation mechanisms. In addition, the models of reagent solidification revealed that the stabilization effect of Na2S was better than that of Na2CO3. This model will be useful in the evaluation of the leaching concentrations of heavy metals in fly ash.

Organ-level evaluation of the carbon starvation hypothesis in deciduous broad-leaved Catalpa bungei plants undergoing drought-induced mortality

86%

Qiu Q. , Wang J. , Su Y. , Li J. , Ma J. , He Q.

Dendrobiology

2018

tom 80

A morphophysiological analysis of the effects of drought and shade on Catalpa bungei plantlets

86%

Wu J. , Li J. , Su Y. , He Q. , Wang J. , Qiu Q. , Ma J.

Acta Physiologiae Plantarum

2017

tom 39

nr 03

Interactions between soil water and fertilizer on leaf photosynthesis and delta13C of Catalpa bungei seedlings

86%

Qiu Q. , He Q. , Wang J. H. , Su Y. , Ma J. W. , Wu J. W. , Li J. Y.

Dendrobiology

2016

tom 76

Our objective was to identify combinations of irrigation and fertiliser application that promoted the photosynthetic productivity and water use efficiency (WUE) of Catalpa bungei. Using response surface methodology based on a rotatable central composite design, we conducted a pot experiment with C. bungei clone 004-1 seedlings. The experiment quantified the effects of interactions between soil water content (W), nitrogen application rate (N), and phosphorus application rate (P) on leaf net photosynthetic rates (Pn), SPAD values (SPAD-502 meter readings of leaf chlorophyll), and carbon isotope composition (δ13C). N had significantly positive effects on the all three leaf parameters, while W had significantly negative effects on leaf δ13C signatures but positive effects on leaf Pn and SPAD values. The magnitude of the N effect exceeded that of the W effect. P had no significant effects on any of the three leaf parameters. The W × N interaction had significant positive effects on Pn and SPAD, but significant negative effects on leaf δ13C. Thus, irrigation and nitrogen application had different effects on seedling growth and WUE, and the two effects were interactive. Catalpa bungei growth was promoted by appropriately increasing nitrogen application and irrigation, but WUE was improved by increasing N and decreasing irrigation. Therefore, strategies for the irrigation and fertilisation of C. bungei plantations should be designed to appropriately balance plant growth and WUE.