SciELO - Scientific Electronic Library Online

 
vol.39 número4Unit Reference Value: Application in appraising inter-basin water transfer projectsClassification and quality of groundwater supplies in the Lower Shire Valley, Malawi - Part 1: Physico-chemical quality of borehole water supplies in Chikhwawa, Malawi índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google

Compartilhar


Water SA

versão On-line ISSN 0378-4738

Resumo

BROUCKAERT, CJ; FOXON, KM  e  WOOD, K. Modelling the filling rate of pit latrines. Water SA [online]. 2013, vol.39, n.4, pp. 00-00. ISSN 0378-4738.

Excreta (faeces and urine) that are deposited into a pit latrine are subject to biodegradation, which substantially reduces the volume that remains. On the other hand, other matter that is not biodegradable usually finds its way into pit latrines. The net filling rate is thus dependent on both the rate of addition of material and its composition. A simple material balance model is presented which represents the faecal sludge as a mixture of biodegradable organic material, un-biodegradable organic material and inorganic material. Measurements made on 2 pits in eThekwini, South Africa, were used to determine parameters for the model. Model predictions were then compared with data from 15 other pits in the same area and filling rate data from previous South African studies, which exhibit a 20th to 80th percentile range of 200 to 453ℓ·pit-1·yr-1. These comparisons indicated that the pits studied exhibited relatively low filling rates resulting from orderly disposal practices. The average composition of the pit (COD, biodegradable material and inorganic fraction) changes with age, which will impact on any subsequent sludge treatment process. Pit filling rates are greatly affected by the disposal of solid waste in addition to the faecal material. For the pits studied, the model predicts that the filling time could have been extended from 15 years to over 25 years if all solid waste had been excluded from the pit.

Palavras-chave : Pit latrine; filling rate; biodegradation; solid waste disposal.

        · texto em Inglês     · Inglês ( pdf )