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Investigating the potential of deep row entrenchment of pit latrine and waste water sludges for forestry and land rehabilitation purposes
Expanded Title:While South Africa struggles to meet its sanitation backlogs, a substantial amount of existing basic sanitation infrastructure, which includes both conventional pit latrines and ventilated improved pit latrines (VIPs), has reached or is reaching the end of its design life. Urgent interventions are required to deal with the escalating accumulation of sludge in these basic units. The options for disposal of this sludge are few. Against this background, this study investigated the application of deep row entrenchment under South African conditions and aimed at providing guidelines for the optimal and safe implementation of this sludge management option. The study investigated plant growth, sludge degradation and leaching of pollutants into the groundwater. Two sites were established to pilot this approach, one in partnership with eThekwini Metro in Umlazi where only pit latrine sludges were entrenched and the other in partnership with SAPPI at is site in Hilton where only municipal sludges were used. The study has shown that entrenchment of sludge is a relatively simple solution for sludge disposal which enables nutrients to retained and accessed over time. Some of the constraints are the cost of transport of sludges and very stringent environmental legislation. Further work is still needed to better understand impact on tree growth over time, fate of nutrients in the soil (more measurements needed, mass balances needed) and the longer term changes in sludge composition and fate of pathogens.
Date Published:01/12/2012
Document Type:Research Report
Document Subjects:Sanitation - Waterborne sanitation
Document Keywords:Municipality
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1829/1/12
ISBN No:978-1-4312-0322-2
Authors:Still D; Louton B; Bakare B; Taylor C
Project No:K5/1829
Organizations:Partners in Development; University of KwaZuIu-Natal
Document Size:6 357 KB
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