scholarly journals Anaerobic digestion of liquid products following hydrothermal carbonisation of faecal sludge at different reaction conditions

2017 ◽  
Vol 91 ◽  
pp. 245-251 ◽  
Author(s):  
Eleni Nyktari ◽  
Eric Danso-Boateng ◽  
Andrew Wheatley ◽  
Richard Holdich
Keyword(s):  
Anaerobic Digestion ◽  
Reaction Conditions ◽  
Liquid Products ◽  
Hydrothermal Carbonisation ◽  
Faecal Sludge

scholarly journals An Assessment of Different Integration Strategies of Hydrothermal Carbonisation and Anaerobic Digestion of Water Hyacinth

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5983
Author(s):  
Aaron E. Brown ◽  
Jessica M. M. Adams ◽  
Oliver R. Grasham ◽  
Miller Alonso Camargo-Valero ◽  
Andrew B. Ross
Keyword(s):  
Anaerobic Digestion ◽  
Water Hyacinth ◽  
Large Scale ◽  
Aquatic Macrophyte ◽  
Integration Strategy ◽  
Bioenergy Generation ◽  
Global Presence ◽  
Freshwater Bodies ◽  
Hydrothermal Carbonisation ◽  
Integration Strategies

Water hyacinth (WH) is an invasive aquatic macrophyte that dominates freshwater bodies across the world. However, due to its rapid growth rate and wide-spread global presence, WH could offer great potential as a biomass feedstock, including for bioenergy generation. This study compares different integration strategies of hydrothermal carbonisation (HTC) and anaerobic digestion (AD) using WH, across a range of temperatures. These include (i) hydrochar combustion and process water digestion, (ii) hydrochar digestion, (iii) slurry digestion. HTC reactions were conducted at 150 °C, 200 °C, and 250 °C. Separation of hydrochars for combustion and process waters for digestion offers the most energetically-feasible valorisation route. However, hydrochars produced from WH display slagging and fouling tendencies; limiting their use in large-scale combustion. AD of WH slurry produced at 150 °C appears to be energetically-feasible and has the potential to also be a viable integration strategy between HTC and AD, using WH.

scholarly journals Modelling the production of solid and liquid products from the hydrothermal carbonisation of two biomasses

2020 ◽  
Vol 151 ◽  
pp. 112452
Author(s):  
A.M. Borrero-López ◽  
E. Masson ◽  
A. Celzard ◽  
V. Fierro
Keyword(s):  
Liquid Products ◽  
Hydrothermal Carbonisation

scholarly journals The Degradation and Repolymerization Analysis on Solvolysis Liquefaction of Corn Stalk

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2337
Author(s):  
Weisheng Chen ◽  
Qinqin Zhang ◽  
Xiaoqi Lin ◽  
Kaisen Jiang ◽  
Dezhi Han
Keyword(s):  
Chemical Components ◽  
Cellulose Derivatives ◽  
Corn Stalk ◽  
Solid Materials ◽  
Reaction Conditions ◽  
Polyethylene Glycol 400 ◽  
Lignocellulosic Feedstocks ◽  
Liquid Products ◽  
Higher Temperature ◽  
Liquefaction Process

One of the most effective and renewable utilization methods for lignocellulosic feedstocks is the transformation from solid materials to liquid products. In this work, corn stalk (CS) was liquified with polyethylene glycol 400 (PEG400) and glycerol as the liquefaction solvents, and sulfuric acid as the catalyst. The liquefaction conditions were optimized with the liquefaction yield of 95.39% at the reaction conditions of 150 °C and 120 min. The properties of CS and liquefaction residues (LRs) were characterized using ATR–FTIR, TG, elemental analysis and SEM. The chemical components of liquefied product (LP) were also characterized by GC–MS. The results indicated that the depolymerization and repolymerization reaction took place simultaneously in the liquefaction process. The depolymerization of CS mainly occurred at the temperature of <150 °C, and the repolymerization of biomass derivatives dominated at a higher temperature of 170 °C by the lignin derivatives repolymerization with cellulose derivatives, hemicellulose derivatives and PEG400 and self-condensation of lignin derivatives. The solvolysis liquefaction of CS could be classified into the mechanism of electrophilic substitution reaction attacked by the hydrogen cation.

scholarly journals Physico-chemical properties and bacterial community structure dynamics during the mesophilic anaerobic digestion of pit latrine faecal sludge

Water SA ◽  
2019 ◽  
Vol 45 (3 July) ◽  
Author(s):  
MC Changara ◽  
WT Sanyika ◽  
C Bangira ◽  
S Misi
Keyword(s):  
Community Structure ◽  
Anaerobic Digestion ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Chemical Properties ◽  
Ribosomal Database Project ◽  
Pollution Indicators ◽  
Physico Chemical ◽  
Pit Latrine ◽  
Faecal Sludge

The study characterized the changes in physico-chemical properties and bacterial community structure during mesophilic anaerobic digestion (AD) of pit latrine sludge. The sludge was sampled from six different pits six times at an interval of 40 days. Standard techniques were used to assess the changes in pollution indicators including COD and faecal coliforms. Metagenomic DNA from a composite sample from the six pits’ sludge was then extracted at Days 0, 14 and 35 and directly sequenced followed by analysis of the microbial structure using the Ribosomal Database Project tools. Multivariate analyses were used to identify the main determinants of microbial community structure during the digestion process.  AD significantly reduced the levels of pollution indicators (p < 0.05). Total solids, volatile solids and COD were reduced by 17–27%, 52–79%, and 42– 63%, respectively. The indicator pathogenic microorganisms FC and E. coli were reduced by 34–54% and 35–60%, respectively. The reduction in terms of COD and BOD were, however, not sufficient to satisfy the standards for safe disposal into the environment. Proteobacteria were the most dominant bacterial phylum in the undigested sludge (24.1%) and were significantly reduced to 2.5% at the peak of the AD (Day 14) up until Day 35. Firmicutes significantly increased (p < 0.05) from 22.4% to 28.8% at Day 14 before being reduced to 11.6% at Day 35. This study contributes to our understanding of AD of pit latrine faecal sludge through mesophilic AD as a baseline study, and helps to inform future research on mesophilic AD.

scholarly journals Valorisation of the liquid fraction from hydrothermal carbonisation of sewage sludge by anaerobic digestion

2017 ◽  
Vol 93 (2) ◽  
pp. 450-456 ◽  
Author(s):  
John A Villamil ◽  
Angel F Mohedano ◽  
Juan J Rodriguez ◽  
M Angeles de la Rubia
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Liquid Fraction ◽  
Hydrothermal Carbonisation
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