| Author | Arellano, Francisco A. |
| Call Number | AIT Thesis no.1089 |
| Subject(s) | Electroplatin--Waste disposal
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | A complete wastewater treatment for a typical plating shop effluent was studied through a laboratory model. The designed treatment process
handles two types of wastewater: concentrated chromic acid waste and
diluted waste. Scrap tin cans was used for reducing chromium from state cr+6 to cr+3 prior to precipitation. Different total can surface area was utilized for a known volume of waste to determine the reaction time for
the reduction. Two systems were studied: batch and continuous flow and their efficiencies were compared. The reduction was found to follow a first order kinetics with a k, specific rate constant varying from 0,1082 to 0.4410 hr-1 • The proposed reduction technique is unique and economical. It does not necessitate the use of expensive chemicals and control systems. Precipitation of metals could be achieved through the use of lime. The volume of the sludge produced from the tin reduced hexavalent chromium solution signified a good settling compaction. All the diluted wastes from the plant studied were combined and treated
with the conventional precipitation and settling methods. Precipitation of the wastes could be carried out in a wide range of pH. Removal of
99.99% chromium from an initial concentration less than 1733 mg/l was reported for the concentrated chromic acid waste. All metal concentrations from the treated wastes were suitable for discharge to receiving streams. |
| Year | 1977 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Nguyen, Cong Thanh |
| Examination Committee(s) | Ouano, E.A.R. ; Samorn Muttamara |
| Scholarship Donor(s) | Government of the United States of America |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1977 |