Authentication email has already been sent, please check your email box: and activate it as soon as possible.
You can login to My Profile and manage your email alerts.
If you haven’t received the email, please:
|
|
There are 8 papers published in subject: > since this site started. |
Results per page: |
Select Subject |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
1. Improvement on Pozzolanic Reactivity of Inert Solid waste by Integrated Thermal and Chemical Activation | |||
Li Yu,Liu Xiaoming,Yao yuan | |||
Environmental Science and Techology 31 May 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Coal gangue, mainly comprised of quartz and feldspar, is a kink of typical inert solid waste. In order to effectively utilize coal gangue, coal gangue was converted into ecological cement by activating it at 800 ℃ with an integrated thermal and chemical activation method in this paper. XRD, NMR techniques and thermodynamics analysis indicates that improved reactivity for coal gangue contributes to the generated amorphous materials during both thermal and chemical activation process. In the chemical activation process, amorphous materials comprised of Q3(0Al), Q3(1Al) and Q0 units formed from parts of inert aluminosilicate minerals (quartz and K-feldspar). CaO+CaSO4 is the most effective corrosion additive, and each probably corrosion reactions between coal gangue and CaSO4+CaO could take place but keep in a non-equilibrium process from 900K to 1200K. Industrial test on a clinker production line shows that the integrated activation method could be applied into industrial production. Cement containing 56% of activated coal gangue had been successfully produced and used in road pavement test with 28-days concrete compressive strength of 35.9MPa. Compared with clinker producing process, energy consumption for producing per ton activated coal gangue could save 90.7kgce mainly due to its low calcination temperature at 800℃, calorific value of about 1600Kcal/kg and less electricity consumption on grinding coal. | |||
TO cite this article:Li Yu,Liu Xiaoming,Yao yuan. Improvement on Pozzolanic Reactivity of Inert Solid waste by Integrated Thermal and Chemical Activation[OL].[31 May 2013] http://en.paper.edu.cn/en_releasepaper/content/4543036 |
2. Characterization of heavy metals in the contaminated BFMSW using synchrotron radiation-induced micro-X-ray fluorescence | |||
ZHANG Hua,WU Jun,SHAO Liming,HE Pinjing | |||
Environmental Science and Techology 25 January 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Heavy metal pollution of biodegradable fraction of municipal solid waste (BFMSW) greatly hampered its beneficial reuse. Synchrotron radiation-induced micro-X-ray fluorescence (SR-μXRF) was employed to elucidate the elemental characteristics of contaminated BFMSW. Six sectioned BFMSW samples were selected for SR-μXRF mapping and 50 individual fine particles sorbed onto BFMSW were analyzed using SR-μXRF point scanning. The results showed that heavy metals tended to be concentrated on the surface of BFMSW and highly localized to some "hot-spots". Marked differences in heavy metal sequestering potentials among various kinds of BFMSW, and the significant role of heavy metal "hot-spots" in BFMSW contamination were identified. The lower heavy metal levels in the simulated samples compared to field samples (with longer and more intense mixing) indicated that inter-contamination during waste handling contributed significantly to heavy metal accumulation in BFMSW. Furthermore, additional information regarding elemental characteristics of individual particles could be acquired using SR-μXRF. | |||
TO cite this article:ZHANG Hua,WU Jun,SHAO Liming, et al. Characterization of heavy metals in the contaminated BFMSW using synchrotron radiation-induced micro-X-ray fluorescence[J]. |
3. Biogas Yields of Food and Green Wastes via Batch Anaerobic Digestion | |||
Liu Guangqing ,Zhang Ruihong | |||
Environmental Science and Techology 17 March 2011 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Biogas and methane yields of food waste and green waste and their mixture were determined using batch anaerobic digesters at mesophilic (35 ± 2oC) and thermophilic (50 ± 2oC) temperatures. The mixture was composed of 50% food waste and 50% green waste, based on the volatile solids. The thermophilic digestion tests were performed with four different feed (food) to inoculm(sludge) ratios (F/I) (1.6, 3.1, 4.0 and 5.0) and the mesophilic digestion was conducted at one F/I (3.1). The results showed that the F/I significantly affected the biogas production rate. At four F/Is tested, after 25 days of thermophilic digestion, the biogas yield was determined to be 778, 742, 784 and 396 mL/gVS for food waste, respectively; 631, 529, 524 and 407 mL/gVS for green waste, respectively; and 716, 613, 671 and 555 mL/gVS for the mixture, respectively. About 80% of the biogas production was obtained during the first 10 days of digestion. At the F/I of 3.1, the biogas and methane yields from mesophilic digestion of food waste, green waste and their mixture were lower than the yields obtained at thermophilic temperature. The biogas yields were 430, 372 and 358 mL/gVS, respectively, and the methane yields were 245, 206, and 185 mL/gVS, respectively. | |||
TO cite this article:Liu Guangqing ,Zhang Ruihong . Biogas Yields of Food and Green Wastes via Batch Anaerobic Digestion[OL].[17 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4416927 |
4. Study on the inhibition of methanogenesis in anaerobic granules by methyl fluoride | |||
HAO Liping,LI Lei,LU Fan,SHAO Liming,HE Pinjing | |||
Environmental Science and Techology 13 February 2011 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Methyl fluoride (CH3F), applied at the appropriate concentration, is considered to be a rather specific inhibitor of acetoclastic methanogenesis (AM), while hydrogenotrophic methanogenesis (HM) is unaffected. Although the application of CH3F for quantifying methanogenic pathways in natural anoxic environments has been well established, its effect on methanogenesis in anaerobic granules is few reported. Herein, we tested the inhibition of CH3F on methanogenesis in the mesophilic anaerobic granules and evaluated this inhibitor technique to monitor carbon flow in artificial methanogenic systems. The results showed that the inhibitory effect increased with the initial CH3F concentrations up to 5%. Stable maximum inhibition with 97.5% methanogenic activity reduced was achieved when 5% CH3F was added to the gas, which was higher than that applied in other anoxic systems. | |||
TO cite this article:HAO Liping,LI Lei,LU Fan, et al. Study on the inhibition of methanogenesis in anaerobic granules by methyl fluoride[OL].[13 February 2011] http://en.paper.edu.cn/en_releasepaper/content/4410647 |
5. Modified First-order Kinetics and Two-Stage Reaction (FKTSR) Land Fill Gas Generation Rate Model | |||
Chen Jiajun,Wang Hao,ZHANG Na | |||
Environmental Science and Techology 08 January 2009 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:The purpose of this work is to establish a new domestic landfill gas (LFG) generation rate model accounting for the impact of leachate recirculation. FKTSR model, namely a LFG generation rate model of the First-order Kinetics and Two-Stage Reaction, in which nutrient balance for biochemical reaction in two main stages is taken into account. In this study, FKTSR model was modified by introduction of outflow function and organic acid conversion coefficient in order to represent the in-situ condition of nutrient loss through leachate. Laboratory experiments were carried out to simulate the impact of leachate recirculation and to verify the modified FKTSR model. The model calibration was then conducted using the observed data of experiments. Fitting results suggest that the new model gives satisfactory fits to experimental data, and the main parameters, LFG production potential (L0), reaction rate constant in first stage (K1), reaction rate constant in second stage (K2) of the modified FKTSR model are 64.746L, 0.202d-1, 0.338d-1, respectively, comparing to the old ones of 42.069L, 0.231d-1, 0.231d-1. The fitting result proves that the new model provides a better explanation for mechanisms involved for landfill gas generation. | |||
TO cite this article:Chen Jiajun,Wang Hao,ZHANG Na. Modified First-order Kinetics and Two-Stage Reaction (FKTSR) Land Fill Gas Generation Rate Model[OL].[ 8 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27474 |
6. Treatment of aged-landfill-leachate using aged-sludge-based bioreactor | |||
WEI Yunmei ,ZHAO Youcai,Yan Li,Li Hongjiang | |||
Environmental Science and Techology 05 September 2007 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Sludge in the landfills and dumping sites becomes stabilized or aged during its long-term stabilization process. The aged sludge contains a wide spectrum and large quantity of microorganisms, which can effectively decompose refractory organic matter present in some wastewaters, such as Municipal Solid Waste (MSW) landfill leachate. In this work, four biofiltration reactors consisted of the aged sewage sludge taken from a 5-year sludge lysimeter was used for biofiltration of aged MSW landfill leachate sampled from a closed landfill. Chemical Oxygen Demand (COD), Biological Oxygen Demand(BOD),Inorganic Carbon(IC) and NH3-N concentrations in the effluent were below 250 mg/L, 10 mg/L, 60 mg/L and 10 mg/L, in comparison the initial concentrations of about 1200 mg/L, 150 mg/L, 1100 mg/L and 1000 mg/L, respectively, at a volume hydraulic load below 35.4 L•m-3•d-1 and ambient temperature of 0-20°C . However, the removal of the total nitrogen (TN) was quite low, only around 20-60%. The NH3-N is mainly converted to nitrate-N. The removal of the total P is high, possibly because of the strong absorption capability of the aged sludge in the bioreactor used. The effluent looks clear, in comparison with the brownish color of the influent. The treatment process developed is cost-effective and easily operated. | |||
TO cite this article:WEI Yunmei ,ZHAO Youcai,Yan Li, et al. Treatment of aged-landfill-leachate using aged-sludge-based bioreactor[OL].[ 5 September 2007] http://en.paper.edu.cn/en_releasepaper/content/14882 |
7. Research on Composition and Recycle Value of Aged Refuse at Shanghai Refuse Landfill | |||
Yang Yujiang,Zhao Youcai | |||
Environmental Science and Techology 29 January 2007 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Refuse at Shanghai Refuse Landfill was excavated from the compartments closed from 1991 to 2004; and the composition of aged refuse was studied. The results show that plastic and rubber fractions were well preserved from photodegradation and oxygen aging in closed compartments, and can be recycled after simple pretreatment; the content of organic fraction, mainly including plastic fraction, increased logarithmically with placement time and will exceed inorganic fraction after 2010. Thus thermal treatment, such as incineration and hydrolysis, may be an effective way for the cycling of aged refuse. | |||
TO cite this article:Yang Yujiang,Zhao Youcai. Research on Composition and Recycle Value of Aged Refuse at Shanghai Refuse Landfill[OL].[29 January 2007] http://en.paper.edu.cn/en_releasepaper/content/10933 |
8. Microwave thermal pretreatment of sewage sludge | |||
Wang wei,Qiao wei | |||
Environmental Science and Techology 28 February 2006 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Water could absorb microwave and increase temperature rapidly within short time. Municipal wastewater treatment plant sewage sludge was used to be heated by microwave digestion reactor. Sludge total solid content (TS) was 2%, 4% and 5%. Microwave heating temperature was 150℃, 170℃ and 190℃, reaction time was 5 minutes. Results show that temperature rising trend from ambient to three specified temperature was similar. Colloid structure was destroyed to release soluble organic components. Dewaterability and settling performance were improved. TS and suspended solid content (SS) reduced. High temperature resulted high SS dissolving ratio. For TS 2% sludge, at 190℃ 40.0% of SS dissolved. | |||
TO cite this article:Wang wei,Qiao wei. Microwave thermal pretreatment of sewage sludge[OL].[28 February 2006] http://en.paper.edu.cn/en_releasepaper/content/5441 |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
Results per page: |
About Sciencepaper Online | Privacy Policy | Terms & Conditions | Contact Us
© 2003-2012 Sciencepaper Online. unless otherwise stated