| Author | Jarussaeng Molen |
| Call Number | AIT Thesis no.EV-08-13 |
| Subject(s) | Dye industry--Waste disposal
|
| 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 study aimed to investigate the treatability options for wastewater generated from a dye manufacturing industry in Thailand. The industry generated wastewater ranging between 600 - 650 m³/day. The wastewater characteristics was analyzed and compared with the Thailand Industrial effluent standards to determine the efficiency of the present treatment plant. The effluent characteristics were found to exceed the standard limits. In order to meet the standards, treatability study on the wastewater was performed to identify appropriate options to reduce the pollution. Options such as pretreatment through coagulation and membrane filtration were carried with the wastewater. Chemical coagulants such as Polyaluminium Chloride (PACT), Ferric Chloride (FeCl₃), and Ciba XCOL 7105 and Fenton's reagent method were investigated. Out of all the options for pretreatment, Fenton's method and Ciba X-COL 7105 was found to be highly effective in color removal of about 97% and Fenton's method was effective in COD removal. However, both of options are not economically viable. Therefore, the option with combination of 6000 ppm of FeCl₃ 1000 ppm of Ciba X-COL 7105 was found to be effective with a removal efficiency of 87% color and 58% COD respectively and cost effective. On other hand, the volume of sludge produced from this option was high and possessed poor sludge volume index (SVI) necessitating coagulant aid to enhance settling. In the case of membrane filtration using, cross flow nanofiltration (NF) membrane and ultrafiltration (UF), NF was found to be efficient in the removal of color and heavy metals and less effective in the removal of TDS and COD. Thus, indicating need for further investigation on the permeate for TDS and COD. From the above study, modification of the existing treatment plant is proposed initiating with segregation of wastewater into low concentration high volume wastewater and high concentration low volume wastewater which can be diverted to the pretreatment unit following membrane filtration unit and sludge treatment. |
| Year | 2008 |
| 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) | Visvanathan, C.; |
| Examination Committee(s) | Nguyen, Thi Kim Oanh;Nowarat Coowanitwon; |
| Scholarship Donor(s) | Thailand (HM Queen); |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2008 |