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Solid Anaerobic Digestion for Fuel Production

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A4: Bio-Energy".

Deadline for manuscript submissions: closed (31 October 2019) | Viewed by 3871

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Guest Editor
Laboratory of Integrated Transformation of Renewable Resources (TIMR UTC-ESCOM), Alliance Sorbonne Université – Université de Technologie de Compiègne, Compiègne, France
Interests: anaerobic digestion; biogas; wastewater treatment; lignocellulosic biomass; bioprocess engineering; biochemistry; biotechnology; environment; soil
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Special Issue Information

Dear Colleagues,

Anaerobic digestion (AD) is a natural process carried out by anaerobic microorganisms, which offers many advantages in regard to the production of renewable energy. Anaerobic digestion produces methane, which is a greenhouse gas that can also be captured and used for fuel production; therefore, it is a key measure for decreasing greenhouse gases. AD processes have been classified into wet AD process and solid AD process, also called dry anaerobic digestion. The latter is the most appropriate process for the degradation of by-products with high total solid (TS > 15 % w/w) content, especially lignocellulosic materials like agricultural waste (straw, manure), household waste, and food waste. Solid AD is already widely used in wastewater treatment plants for treating plants for sewage sludge but could be more developed for lignocellulosic materials with high TS content. Despite the existence of full scale industrial solid AD reactors, many research works are still carried out on solid AD, focused on current limitations (BMP, codigestion, inhibition, microbial populations, rheology, water transfers, size, type and origin of inoculum, etc.) in order to optimize the solid AD process.

This Special Issue aims at encouraging researchers to find solutions to overcome these limitations.

Prof. André Pauss
Guest Editor

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Keywords

  • water transfer
  • rheology
  • solid AD
  • mixing
  • anaerobic microbial behavior
  • continuous solid AD processes

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Published Papers (1 paper)

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Research

21 pages, 3374 KiB  
Article
Optimization of Continuous Solid-State Distillation Process for Cost-Effective Bioethanol Production
by Hongshen Li and Shizhong Li
Energies 2020, 13(4), 854; https://doi.org/10.3390/en13040854 - 15 Feb 2020
Cited by 15 | Viewed by 3605
Abstract
To improve the efficiency of bioethanol production, an advanced process was required to extract ethanol from solid-state fermented feedstock. With regard to the characteristics of no fluidity of solid biomass, a continuous solid-state distillation (CSSD) column was designed with a proprietary rotary baffle [...] Read more.
To improve the efficiency of bioethanol production, an advanced process was required to extract ethanol from solid-state fermented feedstock. With regard to the characteristics of no fluidity of solid biomass, a continuous solid-state distillation (CSSD) column was designed with a proprietary rotary baffle structure and discharging system. To optimize the operation condition, fermented sweet sorghum bagasse was prepared as feedstock for a batch distillation experiment. The whole distillation time was divided into heating and extracting period which was influenced by loading height and steam flow rate simultaneously. A total of 16 experiments at four loading height and four steam flow rate levels were conducted, respectively. Referring to packing, rectifying column, mass, and heat transfer models of the solid-state distillation heating process were established on the basis of analyzing the size distribution of sweet sorghum bagasse. The specific heat capacity and thermal conductivity value of fermented sweet sorghum bagasse were tested and served to calculate the ethanol yielding point and concentration distribution in the packing. The extracting process is described as the ethanol desorption from porous media absorbent and the pseudo-first-order desorption dynamic model was verified by an experiment. Benefit (profit/time) was applied as objective function and solved by successive quadratic programming. The optimal solution of 398 mm loading height and 8.47 m3/h steam flow rate were obtained to guide a 4 m in diameter column design. One heating and two extracting trays with 400 mm effective height were stacked up in an industrial CSSD column. The steam mass flow rate of 0.5 t/h was determined in each tray and further optimized to half the amount on the third tray based on desorption equation. Full article
(This article belongs to the Special Issue Solid Anaerobic Digestion for Fuel Production)
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