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Yuan D.,Beijing University of Civil Engineering and Architecture | Guo X.,Biogas Scientific Research Institute | Cao Y.,Beijing University of Civil Engineering and Architecture | He L.,Chinese Research Academy of Environmental Sciences | And 5 more authors.
The Scientific World Journal | Year: 2012

An ordinary steam turbine retrofit project is selected as a case study; through the retrofit, the project activities will generate emission reductions within the power grid for about 92,463 tCO per annum. The internal rate of return (IRR) of the project is only -0.41% without the revenue of carbon credits, for example, CERs, which is much lower than the benchmark value of 8%. Only when the unit price of carbon credit reaches 125 CNY/tCO the IRR could reach the benchmark and an effective carbon tax needs to increase the price of carbon to 243 CNY/tce in order to make the project financially feasible. Design of incentive mechanism will help these low efficiency enterprises improve efficiency and reduce COemissions, which can provide the power plants sufficient incentive to implement energy efficiency retrofit project in existing coal-fuel power generation-units, and we hope it will make a good demonstration for the other low efficiency coal-fueled power generation units in China. © 2012 Donghai Yuan et al.

Li X.,Chinese Research Academy of Environmental Sciences | He X.-S.,Chinese Research Academy of Environmental Sciences | Guo X.-J.,Biogas Scientific Research Institute | Chen L.,Biogas Scientific Research Institute | Guo N.,University of Sichuan
Archives of Environmental Contamination and Toxicology | Year: 2014

The aim of the present study was to investigate the fluorescence properties of dissolved organic matter (DOM) from four leachate samples, which were disposed by regulating tank (RTK), anaerobic treatment (ATT), oxidation ditch (ODH), and membrane bioreactor and to assess their binding capacities and stability constants by Cu(II). The results showed that five fluorescent peaks, including three humic-like peaks (peaks A, C, and E) and two protein-like peaks (peaks B and D), were identified. Most fluorescent components can be degraded after ODH. Fluorescence-quenching titration showed that the modified Stern-Volmer model can be used to fit the quenching data and calculate conditional stability constants (log K) and the % of fluorophores (f %) between DOM and Cu(II). DOM-Cu(II) complexes had relatively high log K values in the RTK and ATT disposals. After the ODH-treatment process, log K values showed a marked decrease. The f % values of protein-like materials were evidently greater than those of humic-like substances. The results showed the impact of the water treatment on the metal-binding ability of various fractions. © Springer Science+Business Media 2013.

Zheng D.,Biogas Scientific Research Institute | Deng L.-W.,Biogas Scientific Research Institute | Fan Z.-H.,Biogas Scientific Research Institute | Liu G.-J.,Biogas Scientific Research Institute | And 3 more authors.
Bioresource Technology | Year: 2012

This work aimed to investigate the influence of sand layer depth on partial nitritation performance as a preparative step for anaerobic ammonium oxidation (anammox) process in treating anaerobically digested effluent of swine wastewater. A lab-scale biological sand filter system was constructed and partial nitritation was successfully maintained with nitrogen loading rate (NLR) of approximately 50gNH4+-Nm-3d-1. An average NH4+-N removal efficiency of 61.34% and conversion efficiency of NH4+-N to NO2--N of 79.77% were achieved with a sand layer depth of 32cm. An effluent with a NH4+-N concentration of 242.52mgL -1 and a NO2--N concentration of 306.39mgL -1 was achieved when the sand layer depth was 32cm, giving a NO2--N/NH4+-N ratio close to 1.32, as required by anammox. Overall, using a biological sand filter system to treat anaerobically digested effluent of swine wastewater by partial nitritation pretreatment prior to anammox is feasible. © 2011 Elsevier Ltd.

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