Sulfide precipitation of heavy metals using an anaerobic sulfate reduction process | |
| Author | Warounsak Liamleam |
| Call Number | AIT Thesis no.EV-03-25 |
| Subject(s) | Sewage|xPurification -- Heavy metals removal Sulphate pulping process |
| 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-03-25 |
| Abstract | The feasibility of heavy metal removal by sulfide from biological sulfate reduction process was studied. The experimental studies were divided into two parts. The first part focused on biological sulfate reduction process, whereas the second part emphasized the precipitation of heavy metals. Lab-scale UASB process was selected to study sulfate reduction using synthetic wastewater with ethanol as an electron donor and carbon source. Influent compositions were varied at different COD: SO/ ratio ranging from 4: 1 to 1.5: 1. Sulfate reduction over 80 % could be achieved at COD: so/- ratio higher than 2:1, while COD removal efficiency was slightly different at various COD: so/- ratio. It was in the range of 20- 30%. Both sulfate reduction and COD removal efficiencies decreased at low COD: So/ratio, like 1.5: 1. Effect of pH on sulfide production was investigated in CSTR by maintaining the same sulfate-loading rate, which was 1 g so/-/g VSS.d, as those in UASB reactor. The pH in CSTR was controlled ranging from 7.5-9.0. At pH 8.5, sulfate reduction process yielded maximum level of sulfide production. In the second part, optimum pH obtained was 7.5, 8.5, and 9.0 for nickel, cupper, and zinc, respectively. The removal efficiencies of about 62.5% for nickel, 97% for cupper, and 98% for zinc were recorded. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-03-25 |
| 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) | Chongrak Polprasert ;Visvanathan, C. |
| Scholarship Donor(s) | H.M. King of Thailand |