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Anaerobic digestion of lignocellulosic waste: environmental impact and economic assessment

Fan, Yee Van and Klemes, Jiri Jaromir and Perry, Simon and Lee, Chew Tin (2019) Anaerobic digestion of lignocellulosic waste: environmental impact and economic assessment. Journal of Environmental Management, 231 . pp. 352-363. ISSN 0301-4797

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Official URL: http://dx.doi.org/10.1016/j.jenvman.2018.10.020

Abstract

Lignocellulosic waste (LW) is abundant in availability and is one of the suitable substrates for anaerobic digestion (AD). However, it is a complex solid substrate matrix that hinders the hydrolysis stage of anaerobic digestion. This study assessed various pre-treatment and post-treatments of lignocellulosic waste for anaerobic digestion benefiting from advanced P-graph and GaBi software (Thinkstep, Germany) from the perspective of cost and environmental performances (global warming potential, human toxicity, ozone depletion potential, particulate matter, photochemical oxidant creation, acidification and eutrophication potential). CaO pre-treatment (P4), H2S removal with membrane separation post-treatment (HSR MS) and without the composting of digestate is identified as the cost-optimal pathway. The biological (P7- Enzyme, P8- Microbial Consortium) and physical (P1- Grinding, P2- Steam Explosion, P3- Water Vapour) pre-treatments alternatives have lower environmental impacts than chemical pre-treatments (P4- CaO, P5- NaOH, P6- H2SO4) however they are not part of the near cost optimal solutions. For post-treatment, the near cost optimal alternatives are H2S removal with organic physical scrubbing (HSR OPS) and H2S removal with amine scrubbing (HSR AS). HSR AS has a better performance in the overall environmental impacts followed by HSR MS and HSR OPS. In general, the suggested cost-optimal solution is still having relatively lower environmental impacts and feasible for implementation (cost effective). There is very complicated to find a universal AD solution. Different scenarios (the type of substrate, the scale, product demand, policies) have different constraints and consequently solutions. The trade-offs between cost and environment performances should be a future extension of this work.

Item Type:Article
Uncontrolled Keywords:anaerobic digestion, cost optimal, environmental impact
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:87811
Deposited By: Yanti Mohd Shah
Deposited On:30 Nov 2020 21:21
Last Modified:30 Nov 2020 21:21

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