Lead removal through biological sulfate reduction process | |
| Author | Tran Thi Hien Hoa |
| Call Number | AIT Thesis no. EV-02-29 |
| Subject(s) | Sewage--Purification--Heavy metals removal Sewage--Purification--Biological treatment |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-02-29 |
| Abstract | Heavy metal removal through sulfide precipitation was achieved using biological sulfate reduction process. Stage I comprised of startup and operation of sulfidogenic process capable of sulfide-rich effluent. Stage II included investigations on sulfide precipitation of heavy metal using sulfide-rich effluent from sulfidogenic process. Lead was used as heavy metal in these investigations. Start-up of sulfidogenic reactor in Stage I was accomplished in about 3 months using synthetic wastewater with ethanol as carbon source. ill this period COD/S ratio was gradually reduced from 15:1 to 2:1. At the end of startup period, COD removal of about 60-75% and sulfate removal of about 35-40% was achieved. During the operation of sulfidogenic reactor from day 85-115, COD/S ratio of 2: 1 with influent COD concentration of 300 mg/L was maintained. During this period, COD conversion was more than 66% at organic loading rate (OLR) about 1.35 to 1.40 kg COD1mr3 .d. S04 removal efficiency was about 40 - 50% at sulfate loading rate (SLR) of 0.29 to 0.34 kg SOJ mr 3 .d. The percent electron flow by Methane Producing Bacteria (MPB) was about 15 - 20% and by Sulfate Reducing Bacteria (SRB) was about 80- 85%. Investigations on optimum pH for lead sulfide precipitation were carried out separately. The influent lead concentration was maintained at about 45 - 50 mg/L. The optimum pH was obtained in the range of 7.5-8.5 at which the removal efficiencies were recorded in the range 85-95%. This optimum pH was maintained for sulfide precipitation of lead using sulfide-rich effluent from the sulfidogenic reactor. The lead removal efficiencies of 80 - 85% were recorded. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-02-29 |
| 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) | Annachhatre, Ajit P. |
| Examination Committee(s) | Preeda Parkpian ;Lee, Seung-Hwan |
| Degree | Thesis (M.Eng.). - Asian Institute of Technology, 2002 |