http://orcid.org/0000-0002-1074-0251
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ABSTRACT
We report techno-economic analysis of a biological desulfurization process to remove H2S and to produce sulfur from a landfill gas (2000 m3 h−1) produced in Korea. With a process simulation model developed using Aspen Plus®, parametric assessment to determine the effect of various operating parameters such as a NaOH flow rate, a NaOH concentration, and a recycle ratio has been carried out. Based on results from process simulation, economic analysis was conducted to evaluate feasibility of this technology in Korea through a cash flow diagram, net present value (NPV), and discounted payback period (DPBP). It was demonstrated that DPBP of 6.9 years and NPV of 0.39 MM$ were obtained with a 10% discount rate.
Nomenclature
| LFG | = | Land fill gas |
| SCOT | = | Shell Claus off-gas treating |
| APEA | = | Aspen process economic analyzer |
| CFD | = | Cash flow diagram |
| DPBP | = | Discounted payback period |
| NPV | = | Net present value |
| PVR | = | Present value ratio |
| PFD | = | Process flow diagram |
| CEPCI | = | Chemical engineering plant cost index |
| WCI | = | Working capital investment |
| FCI | = | Fixed capital cost |
| MACRS | = | Modified accelerated cost recovery system |
| DDB | = | Double declining balance depreciation method |
| SL | = | Straight-line depreciation method |
| S | = | Salvation |
| KOGAS | = | Korea Gas Corporation |
