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Su Y.,Yancheng Institute of Technology | Su Y.,Jiangsu collaborative innovation center for ecological building materials and environmental protection | Yang J.,Yancheng Institute of Technology | Yang J.,Jiangsu collaborative innovation center for ecological building materials and environmental protection | And 4 more authors.
Environmental Engineering Research | Year: 2016

Magnesium potassium phosphate cement (MKPC) is an effective agent for solidification/stabilization (S/S) technology. To further explore the mechanism of the S/S by MKPC, two kinds of Cd including Cd(NO3)2 solution (L-Cd) and municipal solid waste incineration fly ash (MSWI FA) adsorbed Cd (S-Cd), were used to compare the effects of the form of heavy metal on S/S. The results showed that all the MKPC pastes had a high unconfined compressive strength (UCS) above 11 MPa. For L-Cd pastes, Cd leaching concentration increased with the increase of Cd content, and decreased with the increase of curing time. With the percentage of MSWI FA below 20%, S-Cd pastes exhibited similar Cd leaching concentrations as those of L-Cd pastes, while when the content of MSWI FA come up to 30%, the Cd leaching concentration increased significantly. To meet the standard GB5085.3-2007, the highest addition of S-Cd was 30% MSWI FA (6% Cd contained), with the Cd leaching concentration of 0.817 mg/L. The S/S of L-Cd is mainly due to chemical fixation, and the hydration compound of Cd was NaCdPO4, while the S/S of S-Cd is due to physical encapsulation, which is dependent on the pore/crack size and porosity of the MKPC pastes. © 2016 Korean Society of Environmental Engineers.


Su Y.,Yancheng Institute of Technology | Su Y.,Jiangsu Collaborative Innovation Center for Ecological | Yang J.,Yancheng Institute of Technology | Yang J.,Jiangsu Collaborative Innovation Center for Ecological | And 4 more authors.
Journal of Environmental Chemical Engineering | Year: 2016

Magnesium potassium phosphate cement (MKPC) is a novel agent for solidification/stabilization (S/S) of heavy metals. In this study, different ratios of municipal solid waste incineration fly ash (MSWI FA) were added to MKPC as an admixture to solidify/stabilize heavy metal in an attempt to reduce S/S cost while also disposing and reusing the MSWI FA. The effects of MSWI FA on different heavy metals, including Cd, Pb and a Cd-Pb mixture, were also investigated. The results showed that Cd leaching concentration increased gradually with increasing MSWI FA upon S/S of Cd or Cd-Pb mixtures, while Pb leaching concentration decreased, then increased for Pb and Cd-Pb mixtures. After curing for 90 d, the compressive strength of all MKPC pastes decreased gradually with increasing MSWI FA. Generally, a percentage of MSWI FA below 40% is suitable for being used as an admixture of MKPC to S/S heavy metals, and less than 20% is suggested for being used as a component of construction material. As an admixture of MKPC, MSWI FA exhibited an obviously synergistic effect on S/S of Pb, while it had a lesser effect on S/S of Cd, primarily because of its great adsorption characteristics and chemical fixation of Pb. © 2015 Elsevier Ltd. All rights reserved.


Su Y.,Yancheng Institute of Technology | Liu D.,Institute of Water Science in Coastal Regions of Jiangsu Province | Lin N.,Hohai University | Zhen S.,Yancheng Institute of Technology | Jiang R.,Yancheng Institute of Technology
Chemical Engineering Transactions | Year: 2015

In order to explore the technology of soil and water conservation in coastal saline soil area, improve the prevention and control of soil erosion, white clover (Trifolium repens L) combined with different dosage of polyacrylamide (PAM) was applied to the soil and water conservation in plot tests, and the influence of PAM on the soil and water conservation effects of white clover (Trifolium repens L) was examined. The results showed that compared to the only planting white clover, the addition of 1-5 g/m2 PAM reduced soil erosion by 516.0-1326.3 t/(km2·a), which were 29.5-75.8% of the yearly soil erosion; inhibited soil evapotranspiration by 24.3-43.4%; improved the total rain water interception by 18.0-44.1 mm; and decreased the cumulative percentage of water loss (CP) by 0.4-4.7% in the 30th day after the plants harvest. From the aspects of reduction efficiency of erosion modulus and reduction efficiency of evapotranspiration, the optimistic dosage of PAM was 1 g/m2. The synergy of PAM mainly focus on the early stage of white clover. In addition, PAM may still slightly prevent the water loss after the plants harvest. Copyright © 2015, AIDIC Servizi S.r.l.


Su Y.,Yancheng Institute of Technology | Liu D.,Institute of Water Science in Coastal Regions of Jiangsu Province | Lin N.,Hohai University | Zhen S.,Yancheng Institute of Technology
International Journal of Earth Sciences and Engineering | Year: 2015

Irrigation efficiency (known as irrigation water use coefficient in China) can be measured and calculated by two methods, the standard method in “Specifications for irrigation experiment”(SL13-2015) and the simplified method in “National guide for measurement and calculation of the irrigation water use coefficient of agricultural irrigation”. The standard method is accuracy while it is expensive relatively. On the contrary, the simplified method is convenient while it ignores the paddy filling impact on the irrigation water layer in the calculation. To modify the simplified method more accuracy, the plot experiments were carried to measure the net irrigation water volume of three paddies by simplified method (QM) and by standard method (QS), respectively. The correction coefficient K (ratio of QM to QS) was used to indicate the paddy filling impact, and stem area index (ratio of the total plant stem areas and the total land areas, SAI) was proposed to calculate K. The results showed that QM was usually higher than QS. The values of K were increased with the growth of the paddies, which were between 1.002 and 1.117, and the sequence of K was: Huaidao No. 5 > Nanjing 9108 > Wuyujing. In addition, K was linear with SAI. Modified by the calculated K of the Huaidao No.5 paddy field, the maximum deviation of irrigation efficiency value calculated by simplified method can be reduced about 11.2%. © 2015 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.

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