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RISS 인기검색어
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- 저자 : Areeb Shehzad (검색결과 2 건)
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Areeb Shehzad,Mohammed J. K. Bashir,Sumathi Sethupathi,Jun-Wei Lim,Muhammad Younas 한국자원공학회 2016 Geosystem engineering Vol.19 No.6
Increasing awareness of the energy–environment centers leads to the development of new technologies that have a direct impact on energy production and consumption during environmental remediation. Bioelectrochemical system (BES) is anticipated to be the emerging technology for the simultaneous removal/recovery of resources such as energy, nutrients, water, and heavy metals. Organic compounds inside the leachate are oxidized by micro-organisms which in turn lead to the production of energy and other value-added resources. Through the integration of membrane process such as forward osmosis in BES will help to recover the high-quality water for applications like agricultural. Recovery of metals is largely affected by uncertainty in concentration but still recovery of metal is achievable in leachate. Phosphorous and ammonia can be recovered through cathode reduction reactions driven by electricity generation. Low bioavailability of landfill leachate is one of the major challenges for BES which can be improved through proper pretreatment of landfill leachate. Another challenge of achieving the metal recovery from leachate is the low concentration of heavy metals. System scaling up remains as a great confront, especially for BES as energy production and consumption balance needs to be well understood. This review paper identified the key challenges, opportunities, and future recommendations for the recovery of resources from leachate using BES.
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Sequential treatment for landfill leachate by applying coagulation-adsorption process
mohammad J. K. bashir,Tay Ming Xian,Areeb Shehzad,Sumathi Sethupahi,Ng Choon Aun,Salem Abu Amr 한국자원공학회 2017 Geosystem engineering Vol.20 No.1
Landfill leachate has always been the most problematic factor in municipal solid waste management. Leachate generated from landfills generally contains high amount of organic and inorganic compounds that might cause pollution to water resources. In the current study, sequential treatment of landfill leachate using coagulation–flocculations a pretreatment process followed by adsorption process was used to treat chemical oxygen demand (COD), ammonical nitrogen (NH3-N) and color from raw landfill leachate. Coagulation–flocculation process was examined using alum and ferric chloride. The optimum working pH for the tested coagulants was 5 and FeCl3 showed higher removal efficiency for landfill leachate than alum. The pretreated leachate was further treated via two types of adsorbents i.e., powdered activated carbon (PAC) and zeolite. The optimum experimental conditions for PAC and zeolite adsorptions were found to be 40 g/L at 30 min and 80 g/L at 120 min, respectively. Scanning electron microscope and Fourier transform infrared spectroscopy tests were conducted to examine the surface morphology and chemical properties of the adsorbents. The results showed that the Freundlich isotherm was best fitted for PAC adsorption while Langmuir isotherm model showed good conformity for zeolite adsorption. Besides, pseudo-second order model was found to be the best fitted kinetic model for both PAC and zeolite adsorption where the R2 was closed to unity for all parameters. On balance, FeCl3 coagulation-PAC adsorption has shown higher removal efficiency for color, COD, and NH3-N as compared to FeCl3 coagulation-zeolite adsorption.
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