| Author | Kamal, Saleh Mustafa |
| Call Number | AIT Thesis no. 314 |
| Subject(s) | Sewage lagoons
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of Engineering at the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The effects of recirculation on the performance of two-stage anaerobic ponds and an anaerobic-facultative pond system were evaluated. An optimum recirculation factor, for recycling from the effluent end of the second stage of two-stage anaerobic ponds to the influent end of the first-stage ponds, was determined using a first-stage BOD loading of 2500 Ib/acre per
day. This same loading was used to ascertain the best pattern of recirculation at this optimum recirculation factor. Applying the optimum recirculation factor and the best type of recirculation already determined, the performance of an anaerobic-facultative pond system was studied using a
BOD loading of 1500 Ib/acre per day on the first-stage ponds.
Recirculation from the effluent end of the second-stage pond to the influent end of the same pond was found to be the best type for all systems while the optimum recirculation factor was 1.12, or a recirculation of 12
percent of raw waste inflow. The pond system with the best form of recirculation and optimum recirculated amount effected a BOD reduction of 85 percent in two-stage anaerobic ponds. With the same recirculation form
and recirculation factor, about 95 percent BOD removal was achieved in the anaerobic-facultative pond system. Anaerobic ponds without recirculation emitted perceptableodours at the commencement of all runs.
From the experimental data it was possible to evaluate a practical pond system that could be used in practice. A three-stage pond system consisting of two initial anaerobic ponds followed by a facultative pond
with recirculation across the second-stage could produce an excellent effluent with a BOD concentration of about 5 mg/1 at an overall BOD loading of 500 Ib/acre per day. |
| Year | 1969 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Pescod, M.B. ;McGarry, M.G. |
| Examination Committee(s) | Asian Institute of Technology |
| Scholarship Donor(s) | Asian Institute of Technology |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1969 |
