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Articles by ZHU Zhi-Liang
Total Records ( 2 ) for ZHU Zhi-Liang
  Weng Yong-Ling , Gong Peng and Zhu Zhi-Liang
  Soil salinization is one of the most common land degradation processes. In this study, spectral measurements of saline soil samples collected from the Yellow River Delta region of China were conducted in laboratory and hyperspectral data were acquired from a EO-1 Hyperion sensor to quantitatively map soil salinity in the region. A soil salinity spectral index (SSI) was constructed from continuum-removed reflectance (CR-reflectance) at 2 052 and 2 203 nm, to analyze the spectral absorption features of the salt-affected soils. There existed a strong correlation (r = 0.91) between the SSI and soil salt content (SSC). Then, a model for estimation of SSC with SSI was established using univariate regression and validation of the model yielded a root mean square error (RMSE) of 0.986 (SSC of the soil samples ranging from 0.06 to 12.30 g kg-1) and an R2 of 0.873. The model was applied to a Hyperion reflectance image on a pixel-by-pixel basis and the resulting quantitative salinity map was validated successfully with RMSE = 1.921 and R2 = 0.627. These suggested that the satellite hyperspectral data had the potential for predicting SSC in a large area.
  ZHANG Li-Hua and ZHU Zhi-Liang
  An environmentally benign biodegradable chelant, polyepoxysuccinic acid (PESA), was used to separate heavy metals from sewage sludge from the Shanghai Taopu Wastewater Treatment Plant, China, based on chemical extraction technology. The extraction of chromium (Cr) from sewage sludge with an aqueous solution of PESA was studied under various conditions. It was found that the extraction of Cr using PESA was more efficient than that using ethylenediaminetetraacetic acid (EDTA) and S,S-ethylenediaminedisuccinic acid (EDDS) under similar conditions. PESA was capable of extracting Cr from the sewage sludge, and the extraction efficiency was obviously dependent on both the pH and the concentration of the chelating reagent. The extraction efficiency decreased gradually with increasing pH, and the dependence on pH decreased as the concentration of PESA increased. The extraction efficiency reached 58% under conditions of pH = 4 and a ratio of PESA to total heavy metals of 10:1. The extraction efficiency was maintained above 40% within the pH range from 1 to 7 at the high ratio of PESA to total heavy metals of 10:1. Comparing the contents of heavy metals in the sewage sludge before and after the extraction, it was found that the extracted Cr came mainly from the reducible and oxidizable fractions.
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