Modeling the Filling Rate of Faeces in Ordinary Pit Latrines

Faecal sludge deposited into the pit latrine is subject to biodegradation. The aim of this research was develop model for filling rate faeces in ordinary together with effect shape factor on such fillings prepare minds users characteristics based contents, usage and environmental factors. Consequently, faecal sludges sampled from 100 pits already filled were subjected laboratory analyses their physico-chemical biological characteristics. Models actual latrines derived using BOD, COD, VS, TS data, calibrated verified. For a more critical situation, models also rates considering shapes that gave comparison general condition. From results, lower than those obtained VS TS. However, COD closer other parameters since could not be used assess latrines. exhibited low terms BOD 2 pits. In higher compared BOD. Low observed volatile solids only 3 moderately high whereas total had highest number rates. both square rectangular increased by 26.5% 40 – 90 ℓ/capita/year 50 112 due above values existing while circular remained same. Reduction volume increase dead corners as result clogging, thereby reducing area available infiltration surrounding soil. Circular are stable because natural arching ground around hole there no concentrate stresses. Pits flat sides much likely clogging resulting pit. study, it therefore evident determines taking consideration geological Thus optimal design, our engineers should take note factor. Thus, can determine soil characteristics, conditions favourable conditions.