A study of neutral sulfite waste liquor treatment | |
| Author | Anusorn Sangnimnuan |
| Call Number | AIT Thesis no. EV-79-4 |
| Subject(s) | Sewage--Purification--Biological treatment Factory and trade waste |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | This research was conducted in a view to studying the sources and characteristics of neutral sulfite wastewater, and to evaluate feasible and appropriate treatment methods. Sources of neutral sulfite waste were mainly from filtering of pulp mill. Flows and characteristics of this waste were found to be highly variable on both hourly and daily basis. It contained 2,500 mg/~ BOD5 and 10,800 mg/i COD but low concentrations of nitrogen and phosphorous. Three biological treatment alternatives were studied namely, anaerobic pond followed by aerated lagoon (alternative I), by extended activated sludge (alternative II) and by bio-drum (alternative III). Black colour of treated waste was further removed by both chemical treatment and activated carbon adsorption. With detention time of 10 days, anaerobic pond was found to beef efficient to remove COD and BOD5 as much as 45.7% and 56.2%, respectively. With regard to alternative I, II and III, about 64% of COD and 96% of BOD5 could be removed at detention time of 7 days for aerated lagoon, or with organic loading of 0.25 kg BODs/kg MLSS-d for extended activated sludge system, and volumetric loading of 0,856 kg BOD5/m3-d for bio-drum system. All design parameters were evaluated for aerated lagoon and extended activated sludge. More than 64% of colour can be further removed by 1.5 g/i of alum dosage or 1.0 g/~ of activated carbon when the liquor was adjusted to pH4. |
| Year | 1980 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| 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) | Nguyen, Cong Thanh ;Samorn Muttamara ; |
| Examination Committee(s) | Chongrak Polprasert; |
| Scholarship Donor(s) | Government of Australia. ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1980 |