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Article
Trash removal methods for improved mechanical emptying of pit latrines using a screw auger
Faculty Scholarship
  • Tracey Sisco, NC State University
  • Tate Rogers, NC State University
  • Walt Beckwith, NC State University
  • Willy Chipeta, Mzuzu University
  • Rochelle Holm, University of Louisville
  • Christopher A. Buckley, University of KwaZulu-Natal
  • Francis L. De Los Reyes, NC State University
Document Type
Article
Publication Date
3-1-2017
Department
Medicine
Disciplines
Abstract

Trash in pit latrines is one of the largest challenges facing pit emptying technologies, including the powered auger (the Excrevator), developed for improved emptying in lower- and lower-middle income countries. This study focused on two trash removal methods in conjunction with pit emptying by the Excrevator: (1) simultaneous removal of trash with sludge and (2) manual trash removal prior to sludge removal. Simultaneous removal was tested by adding to the inlet of the Excrevator system two cutting heads designed to reduce the size of trash particles before entering the pipe and auger. Laboratory testing indicated that the auger will not provide the rotational speeds necessary for proper maceration of fibrous materials such as clothing, indicating that a separate maceration unit with higher rotational methods may be more appropriate. Four manual trash removal mechanisms were designed to improve on existing manual trash ‘fishing’ tools such as iron rods with fixed hooks. Two of these tools (the ‘claw’ and the ‘hook’) showed promising laboratory results and were subsequently field tested in Mzuzu, Malawi. Both tools proved more efficient than the current tools used in the field and have potential for use in Malawi.

DOI
10.2166/washdev.2017.106
ORCID
0000-0001-8849-1390
Citation Information
Tracey Sisco, Tate Rogers, Walt Beckwith, Willy Chipeta, et al.. "Trash removal methods for improved mechanical emptying of pit latrines using a screw auger" (2017)
Available at: http://works.bepress.com/rochelle-holm/13/