University of Surrey

Test tubes in the lab Research in the ATI Dance Research

The Feasibility of Char and Bio-oil Production from Pyrolysis of Pit Latrine Sludge

Bond, Thomas, Tse, Queenie, Chambon, Clementine L., Fennell, Paul, Fowler, G.D. and Templeton, Michael (2017) The Feasibility of Char and Bio-oil Production from Pyrolysis of Pit Latrine Sludge Environmental Science: Water Research & Technology.

[img] Text
Bond EW-EST 2017 accepted version 17-11-17.xps - Accepted version Manuscript

Download (1MB)

Abstract

Sustainable methods are required in developing regions to treat and recover value from pit latrine sludge. One strategy is to pyrolyse pit latrine contents and generate char and bio-oil, which can then be used as a soil enhancer and fuel, respectively. Despite the many benefits associated with the process, there is very limited relevant literature available. This study examines its feasibility. Initially, the energy balance for the pyrolysis of sewage sludge was calculated using data from 14 literature studies. The average net energy recovery from pyrolysis of dewatered and dried sewage sludge followed by use of bio-oil as fuel was calculated as 4.95 ± 0.61 MJ kg−1. For dewatered sewage sludge, an average net energy input of 2.23 ± 0.31 MJ kg−1 was required. Parallel calculations were undertaken where pit latrine sludge with 0–100% water content was the hypothetical feedstock. On average, net energy recovery from produced bio-oil was achievable when pit latrine sludge with a water content of ≤∼55% was the feedstock. When both bio-oil and char were utilised, net energy recovery was feasible at a water content value of ≤∼65%. Char production is more favourable from stabilised pit latrine sludge with lower moisture and volatile solids content. Barriers to the pyrolysis of pit latrine sludge include its heterogeneous composition and the difficulty of collecting high-viscosity sludge. Overall, this study demonstrates the potential of pyrolysis as a disposal and value addition method for pit latrine sludge. Innovative methods for sludge drying and pit emptying will expedite the process becoming a reality.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Bond, Thomast.bond@surrey.ac.ukUNSPECIFIED
Tse, QueenieUNSPECIFIEDUNSPECIFIED
Chambon, Clementine L.UNSPECIFIEDUNSPECIFIED
Fennell, PaulUNSPECIFIEDUNSPECIFIED
Fowler, G.D.UNSPECIFIEDUNSPECIFIED
Templeton, MichaelUNSPECIFIEDUNSPECIFIED
Date : 29 November 2017
Identification Number : 10.1039/C7EW00380C
Copyright Disclaimer : © Royal Society of Chemistry 2017
Depositing User : Clive Harris
Date Deposited : 04 Jul 2017 13:04
Last Modified : 03 Jan 2018 11:47
URI: http://epubs.surrey.ac.uk/id/eprint/841554

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800