| Author | Sritharan, Manickanadarasa |
| Call Number | AIT Thesis no. EV-87-27 |
| Subject(s) | Sewage--Purification--Activated sludge process
|
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Laboratory scale batch and continuous-flow experiments were conducted on synthetic feed in order to find the effects of powdered
activated carbon(PAC) addition to activated sludge system in the presence
of mercury.
The batch test results revealed that mercury (Hg++) concentrations of more than 2.5 mg/l were inhibitory to the microbial
population and addition of PAC at 300 mg/l concentration could reduce
the toxic effect and enhance organic removal from 50 % to 75 % when the
Hg++ concentration was 5.0 mg/l.
However, in the continuous-flow experiment at 5 mg/l Hg+concentration inhibitory effect was not pronounced and addition of PAC upto 1000
mg/l did not improve process performance in terms of organic removal.
PAC addition also was not effective in improving the sludge
settleability and was not able to prevent bulking of sludge in
continuous-flow activated sludge process . However it can be useful to
overcome shock loading effects due to heavy metal.
The sludge growth parameters and kinetic constant of biological oxidation were determined for the reactors with 100, 500 and
1000 mg/l PAC and without PAC in the presence of 5. 0 mg/l Hg++ and are
discussed here. |
| Year | 1987 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Shin, Hang-Sik
|
| Examination Committee(s) | Hanaki, K. ;Orth, Hermann M.
|
| Scholarship Donor(s) | The Government of The Federal Republic of
Germany (DAAD)
|
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1987 |