Waste auditing in a rice cracker factory | |
| Author | Arunee Janesiripanich |
| Call Number | AIT Thesis no. EV-95-2 |
| Subject(s) | Waste minimization Factory and trade waste |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-95-2 |
| Abstract | This waste audit study was conducted in the second largest rice cracker factory in Thailand with a capacity of 1,600 Tons/year. The company produces excellent quality products for Japanese export market. Currently the factory generates 41 m3/day wastewater from production process, 30 m3/day domestic effluent and that from utilities at 25 m3/day - totalling to 96 m3/day. Out of this, 60 m3/day is sent to effluent treatment plant (ETP) for treatment. The company is however facing serious problems of sludge bulking in aeration tank and excessive algal growth in oxidation pond. In view of reducing the waste generation at source and also meeting the required effluent standard and resolve the ETP operation and management problem, this study was conducted using the waste audit approach. After conducting a thorough multi-media waste audit, a number of avenues for waste reduction and recommendations for a better ETP operation and management were identified. The produced airborne particulate matter satisfy the Thailand standard. About 22% of the working areas are exported to high level of noise. Heat determination showed that all the sampling locations failed to meet the standards. Rice washing and dehydration are the major sources of high BOD process wastewater with respective contributions ofl5% (BOD 5424 mg/L) and 44% (BOD 3764 mg/L) of the total effluent discharged to ETP. These were recommended to be segregated. Steaming tank cleaning and lubricating conveyor wastewater with high BOD concentration are also strong wastes which need to be segregated. The study reveals that 60 kg of SS are daily settled in the drainage system leading to ETP. A number of alternatives including sedimentation, coagulation, and centrifugation were suggested and evaluated for recovering these solids. This study showed that taking necessary steps (water reuse, waste segregation and solids recovery) water consumption can be reduced by 21 m3/day and also BOD, COD, and SS loading of overall wastewater discharged to ETP could be reduced 19%, 24%, and 49% of the existing situation, respectively. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-95-2 |
| 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) | Visvanathan, C. |
| Examination Committee(s) | Stoll, Uwe;Nagarur, N. N.;Athapol Noomhorm |
| Scholarship Donor(s) | Electricity Generating Authority of Thailand (EGAT) |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 1995 |