Treatment and management of zinc containing wastewater from rayon industry | |
| Author | Zaw Ko Oo |
| Call Number | AIT Thesis no.EV-07-55 |
| Subject(s) | Rayon industry and trade--Waste disposal Zinc--Environmental aspects |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | Zn removal of wastewater discharged from the spinning process of rayon industry was studied. Sulfide rich effluent from UASB reactor was mixed with wastewater for zinc removal. Before sulfide-rich effluent from UASB was recycled, optimum p1l for ZnS precipitation was ascertained by the jar test. It was showed that more than the pf1 8 was optimum for ZnS precipitation and the removal efficiency was more than 98.6%. According to jar test result, the pilot scale zinc sulfide precipitation process was carried out at pH between 7 and 8 because difficult to adjust pH at exact amount in real condition. The results from the precipitation showed that more than 96 °% of' zinc was removed as zinc sulfide and it meet the National Discharge Standard of 5 mg/I of zinc concentration. The settling characteristic of zinc sulfide sludge was investigated by batch settling column test. Experiment with pure supernatant and CaSO4 and ZnS mixed supernatant achieved a total TSS removal efficiency of 64 % at 70 min and 88.8 % at 60 min, respectively. Based on the hatch settling test result, provided the settler design as 2 circular basins with diameter 11.3 m and slope 0.04 mm/m. CBA was based on evaluation between conventional treatment and developed technology. The analysis obtained O&M cost of developed technology was less than the cost of conventional treatment |
| Year | 2007 |
| 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 (EV) |
| Chairperson(s) | Annachhatre, Ajit P. |
| Examination Committee(s) | Nguyen Thi Kim Oanh;Shipin, Oleg |
| Scholarship Donor(s) | Prospect Burma - AIT Fellowship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2007 |