The compressibility of stale waste is studied based on the investigation into the composition and properties of stale waste in the Chongqing City. Stale waste sampled at a landfill closed for over 8 a was analyzed ind...The compressibility of stale waste is studied based on the investigation into the composition and properties of stale waste in the Chongqing City. Stale waste sampled at a landfill closed for over 8 a was analyzed indoors for its natural density, natural water content, relative density, grain size distribution curve, uniformity coefficient and curvature coefficient. Indoor compression tests for the stale waste were performed to find out the void ratio and its dependence upon applied pressure, compressibility coefficient, constrained modulus and volume compressibility coefficient. From the experimental data, the curvature coefficient and the preconsolidation pressure of the stale waste were worked out. The results indicates that the stale waste is of high compressibility, which is different from the other kinds of common soil, and is underconsolidated soil. The measured compressibility parameters are applicable to settlement calculation of closed landfills.展开更多
Enhanced biological phosphorus removal(EBPR) was investigated in an anaerobic/aerobic sequencing batch reactor(SBR) supplied with glucose as a single organic substrate.The results illustrated that EBPR process could a...Enhanced biological phosphorus removal(EBPR) was investigated in an anaerobic/aerobic sequencing batch reactor(SBR) supplied with glucose as a single organic substrate.The results illustrated that EBPR process could also occur successfully with glucose other than short chain fatty acids(SCFAs).High phosphorus release and poly-hydroxyalkanoate(PHA) accumulation in the anaerobic phase was found vital for the removal of phosphorus during the aerobic phase.The measurement of intracellular reserves revealed that glycogen had a higher chance to replace the energy role of poly-P under anaerobic conditions.Moreover,glycogen was also utilized as the carbon source for PHA synthesis,as well as a reducing power as reported earlier.The accumulated PHA in this system was mainly in the form of poly-hydroxyvalerate(PHV) instead of poly-hydroxybutyrate(PHB),and was inferred to be caused by the excess reducing power contained in glucose.Lactate as a fermentation product was also found released into the bulk solution.Applying fundamental biochemistry knowledge to the experimental results,a conceptual biochemical model was developed to explain the metabolism of the glucose-induced EBPR.展开更多
基金Application and Foundation Research Fund of Chongqing Construction Committee,2001.
文摘The compressibility of stale waste is studied based on the investigation into the composition and properties of stale waste in the Chongqing City. Stale waste sampled at a landfill closed for over 8 a was analyzed indoors for its natural density, natural water content, relative density, grain size distribution curve, uniformity coefficient and curvature coefficient. Indoor compression tests for the stale waste were performed to find out the void ratio and its dependence upon applied pressure, compressibility coefficient, constrained modulus and volume compressibility coefficient. From the experimental data, the curvature coefficient and the preconsolidation pressure of the stale waste were worked out. The results indicates that the stale waste is of high compressibility, which is different from the other kinds of common soil, and is underconsolidated soil. The measured compressibility parameters are applicable to settlement calculation of closed landfills.
基金Science and Technology Project of Zhejiang and Hangzhou (No2007C13081, No20062912A06)
文摘Enhanced biological phosphorus removal(EBPR) was investigated in an anaerobic/aerobic sequencing batch reactor(SBR) supplied with glucose as a single organic substrate.The results illustrated that EBPR process could also occur successfully with glucose other than short chain fatty acids(SCFAs).High phosphorus release and poly-hydroxyalkanoate(PHA) accumulation in the anaerobic phase was found vital for the removal of phosphorus during the aerobic phase.The measurement of intracellular reserves revealed that glycogen had a higher chance to replace the energy role of poly-P under anaerobic conditions.Moreover,glycogen was also utilized as the carbon source for PHA synthesis,as well as a reducing power as reported earlier.The accumulated PHA in this system was mainly in the form of poly-hydroxyvalerate(PHV) instead of poly-hydroxybutyrate(PHB),and was inferred to be caused by the excess reducing power contained in glucose.Lactate as a fermentation product was also found released into the bulk solution.Applying fundamental biochemistry knowledge to the experimental results,a conceptual biochemical model was developed to explain the metabolism of the glucose-induced EBPR.
