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Yang Q.Z.,Singapore Institute of Manufacturing Technology | Yang F.,Shenzhen Batian Ecotypic Engineering Co.
Proceedings of the ASME Design Engineering Technical Conference | Year: 2011

This paper explores techniques in sustainability metrics modeling and metrics-driven scenarios analysis to evaluate and improve process performance in sustainable waste management. The sustainability is measured along the triple bottom line. Model-based metrics for quantifying environmental impacts, societal implications, and economic profitability of material recovery processes are developed as functions of processing technology choices, key operating parameters, and material market conditions. Process scenarios are analyzed based on the metric models developed to provide a series of reference points for process performance improvement. The results have provided recyclers with a solid understanding of the factors affecting sustainability in waste management, and facilitated them to make and justify sustainability decisions in sustainable recovery of materials from industrial wastes. © 2011 by ASME.

The present invention is a preparation method for asphalt-based spherical activated carbon which requires no infusibilization process. Placing coal tar asphalt into a melting device; introducing compressed air of 0.1 MPa-0.5 MPa into the device and stirring until a melting temperature of 280 C.-350 C. is reached; continuing for 2-8 hours until the base material has a softening point of 200 C.-260 C.; after cooling down, pulverizing the base material to obtain asphalt powder. Obtaining 34%-79% by mass of carbon powder, 1%-10% by mass of binder, and 20%-65% by mass of the asphalt powder and then forming spherical particles with a diameter of 0.5 mm-5 mm with the carbon powder, the binder and the asphalt powder at room temperature. Introducing the spherical particles of asphalt directly into an asphalt carbonization furnace for carbonization at a temperature of 600 C.-900 C. under protection of an inert gas to obtain asphalt spherical carbon. Asphalt spherical carbon is subject to activation treatment to obtain asphalt spherical activated carbon. The preparation method of the present invention reduces processing difficulty and production costs significantly.

Han D.-F.,Shenzhen Batian Ecotypic Engineering Co. | Han D.-F.,South China Agricultural University | Wang D.-H.,South China Agricultural University | Huang P.-Z.,Shenzhen Batian Ecotypic Engineering Co. | And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2010

Soil and foliar application of melamine (ME) treatments to 'Zaoshu 5' Chinese cabbage were investigated. The ME was degraded very slowly in soil treated with different dosages (40, 160 and 800 mg · kg-1), and 90 days later the residuals of ME were 21.1%, 15.8% and 43.6% respectively. The Chinese cabbage could take in exogenously applied ME through its root and stem leaf and accumulate it to considerable levels with the increasing applied density. In soil application test, the maximum and minimum contents of ME were 105.7 and 8.0 mg · kg-1 in root, and 139.9 and 7.1 mg · kg-1 in stem leaf; the ME transport occurred from root to stem leaf. In foliar application test, the maximum and minimum contents of ME were 4.3 and 0.9 mg · kg-1 in root, and 8.5 and 3.2 mg · kg-1 in stem leaf. In soil application test, the low level of ME (40 mg · kg-1) increased the biomass yield by 9.8% and the high level of ME (800 mg · kg-1) decreased the biomass yield by 15.9%; the contents of chlorophyll and soluble sugar increased, but the content of Vitamin C decreased. Foliar application ME had no obvious significance on the growth of Chinese cabbage. The studies indicate that the residual time of ME in soil is long and the Chinese cabbage can absorb exogenously applied ME and ME can affect the growth of Chinese cabbage.

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