| Author | Hossain, Alamgir |
| Call Number | AIT Thesis no. AE-95-31 |
| Subject(s) | Fish ponds
|
| Note | A thesis submitted in partial fulfi llment of the requirement
for the degree of Master of Engineering, School of Environment, Resources, and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A horizontal flow prefiltration system, a rotating drum filtration unit and
a combination of prefilter and rotating drum units were developed for removing
turbidity and algae from pond water. The main objectives of the study were to
determine methods for the reduction of si1t and plankton turbidity and to harvest
excess plankton from fish ponds at different flow rates and different turbidity
concentrations. The inf1uent turbidity concentration, flow rates, fi1tering
materials and sizes have been found to be factors affecting the turbidity
reduction for both individual and combined media.
For pond water sources 2
of high turbidity up to 252 NTU, the optimum flow
rate was found to be 0.15 m /m - hr for 1. 7 - 12. 7 mm crushed stone as individual
filter media. The optimum flow rate for 25 µm screen to remove algae waf 1. 15
m /m2
- hr as individual filter media. The combination of flow rates3 of 9.15 m /m -hr
t through stone and synthetic material, and flow rate of 2.15 m / m - hr through
micro screen were found optimum to remove plankton, and mixture of plankton and
silt turbidity.
It is concluded from this study that horizontal flow prefilter system using
crus hed stone is found to be very effective in removing silt turbidity at minimum
flow condition. The combined filter media of micro screen and coarse media of
crushed stone and synthetic material are found very efficient in removing
suspended solids of plankton, and si 1 t and plankton together at high and low flow
rates from pond water |
| Year | 1995 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Yakupitiyage, Amararatne;Visvanathan, C. |
| Examination Committee(s) | Little, David C. |
| Scholarship Donor(s) | The Government of Bangladesh and Asian Development Bank (ADB) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1995 |