| Author | Yadav, Chandra Shekhar |
| Call Number | AIT Thesis no. EV-95-9 |
| Subject(s) | Night soil
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-95-9 |
| Abstract | The generation of nightsoil in existing sanitary situations of Kathmandu has been found as 84 I/capita/year with the reported desludging period of about 6 years. This quantity can not be realistic with a proper on-site systems and therefore, the quantity with solids content of 8.5 % has been projected for future generation in order to facilitate the suction of nightsoil from onsite system. The Future generation of nightsoil is found as 263 I/capita/year, projected assuming good conditions of on-site systems. The quality of nightsoil (OSS content) is also assessed in order to investigate the existing conditions of OSS and to find the suitable treatment system. The capacity of on-site systems is investigated thoroughly, which shows great variation ranging from 2 m3 to 20 m3 • The Linear Programming software (LINDO) is used to select the numbers and capacity of trucks including various operational conditions with minimum operation cost. The linear programming model has selected 8 nos. of 2 m3 , 16 nos. of 4 m3 and 1 of 6 m3 as per availability of the trucks' capacity. Gas potential of nightsoil is investigated and digestibility of VSS in Kathmandu is found as quite satisfactory, it produces 0. 7 56 m3 of biogas per kg. The different treatment methods; co-disposal at wastewater treatment facility, co-disposal with solid waste (landfilling), pond system, anaerobic digestion and co-composting with solid waste have been accounted mainly for the comprehensive study in context of study area. Finally, numerical rating analysis is done to find the most suitable treatment system. This analysis helped to find the pond-system as the best suitable treatment system among the treatment methods accounted. The legislations and institutions for the nightsoil management have been also investigated and the need of restructuring of institution is found. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-95-9 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Stoll, Ing. Uwe |
| Examination Committee(s) | Annachattre, A. P.;Thapa, G. B. |
| Scholarship Donor(s) | USAID. |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1995 |