Sequential precipitation of heavy metals with hydroxide and sulfide | |
| Author | Narangerel, Tamirkhuu |
| Call Number | AIT Thesis no.EV-09-19 |
| Subject(s) | Heavy metals Sewage--Purification--Biological treatment Sewage--Purification--Heavy metlas removal |
| 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 | This investigation was involved the lab scale experiment for heavy metal separation from wastewater with hydroxide and sulfide. This experiment was done in Ambient Laboratory in Asian Institute of Technology. Synthetic wastewater simulated as an electroplating industrial wastewater used for the study. The lab experiment had two sub experiments. First experiment proposed to find out optimum condition of sequential precipitation of heavy metals using hydroxide. Second experiment proposed to find out optimum condition of sequential precipitation of heavy metals with sulfide. pH value was carried out in the both experiments and concentration of hydroxide was higher than equivalent concentration of heavy metals in the solution . Results of experiments are defined as below: • For Hydroxide precipitation at ambient temperature - pH=7.5, removal efficiency is 99.4 percent for dissolved zinc - pH=8.3, removal efficiency is 99.991* percent for dissolved copper Note: * - 99.2 percent of copper was precipitated at pH=7.5 • For Sulfide precipitation -pH=7.0, removal efficiency is 99.9932 percent for dissolved copper -pH=11.0, removal efficiency is 99.984 percent for dissolved zinc The heavy metals hydroxide precipitation method could not separate the zinc and copper one by one, because of both the metals were precipitated at the same condition. The results of study showed that method of sequential precipitation of heavy metals with sulfide was more suitable, easy to handle, and had higher efficiency than heavy metal hydroxide precipitation method. |
| Year | 2009 |
| 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) | Nguyen, Thi Kim Oanh;Preeda Pakpian; |
| Scholarship Donor(s) | The Netherlands; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2009 |