Hydrothermal Carbonisation of Sewage Digestate: Influence of solid loading on hydrochar and process water characteristics
Sewage sludge management is one of the biggest concerns to the wastewater industry due to the increasing volumes produced and new stringent environmental regulations.Hydrothermal Treatments are a good option for converting wet biomass such as sewage sludge into high value products.The digestate resulting from anaerobic digestion of sewage sludge still contains a high residual of organic matter and its current disposal via land-spreading in agricultural land does not fully harness its potential as a feedstock for bioenergy production.Digestate is therefore a potential feedstock for hydrothermal processing and this route may enhance biogas production or contribute to the production of high value products like hydrochar.In this work,the influence of solids load on the characteristics of the resulting hydrochar and process waters have been study for hydrothermal carbonization (HTC) of sewage digestate.That is evaluated with regard to product yields,biomethane potential and solubilisation of organic carbon.Tests at 250℃ with 30-minute reaction time were carried out.Hydrochar yields ranged from 64 to 88%.The soluble fraction of organic carbon increased from 2.6g/L in the digestate to 72.3g/L in the process water obtained at the highest solids load tested for HTC.Process waters also help to enhanced methane production up to 378% when compare with original digestate samples.The Boyles and Buswells equation were used to compare theoretical with experimental BMP yields and it was found that the Buswells equation had closer agreement to the experimental values.
Digestate Hydrothermal process Sewage sludge Process waters
C.Aragon-Briceno A.B.Ross M.A.Camargo-Valero
Institute for Public Health and Environmental Engineering (iPHEE), School of Civil Engineering, Univ School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
161-164
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）