Evaluation and Field Testing of an EHTP Technology

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This project carried out field testing of an emerging novel enhanced hydrothermal polymerisation (EHTP) technology for treatment of faecal sludge (FS) from low-cost sanitation systems. A detailed review of established and emerging technologies for centralised treatment of FS from pit latrines was conducted. 

FS was collected from pit latrines and processed in the EHTP pilot scale reactor to produce hydrochar. Quantities and quality of the hydrochar were evaluated to identify the most suitable use of the hydrochar e.g. as a biofuel, fertilizer or building material. The quality of hydrochar and process effluent complied with the parameter limits given in the DWS guidelines for utilization and disposal of wastewater sludge as well as limits given in ISO 30500:2018. The results from the project have resulted in the EHTP technology being identified by SASTEP as one of the technologies that need to be funded for full-scale demonstration for application in the management of FS from low-cost sanitation systems.