Biodrying of cassava peel from tapioca starch industry | |
| Author | Thitinun Chairassamee |
| Call Number | AIT Thesis no.EV-13-33 |
| Subject(s) | Cassava Drying Agricultural industries--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 |
| Series Statement | Thesis ; no. EV-13-33 |
| Abstract | The study aimed to develop the biodrying process to utilize cassava peel waste in Thailand. The biodrying of cassava peel waste with bulking agents has been investigated in aerobic system. Activated sludge was used to adjust the C/N ratio as amendment. The cassava peel biodrying was performed in this study using rice husk and coconut dust as the bulking agents. There were three reactors that operated at different airflow rates (0.015, 0.030 and 0.045 m³/h.kg (wet basis)) and turning every 4 days. Initial investigations included addition of rice husk as the bulking agent with three varying C/N ratio (23.7, 30.2 and 37.3). The highest moisture removal was obtained in the reactor with 30.2 of C/N and 0.030 m³/h.kg of airflow rate. The results indicated that medium airflow rate produced the highest temperature of 66°C and removed the maximum of moisture content up to 70.92%. The heating value was increased from the initial of 3,995 kJ/kg of wet basis up to 10,100 kJ/kg after moisture removal. In the second part, coconut dust was used as the bulking agent. The different C/N ratios were 29.0, 31.5 and 33.8. The highest temperature was 61 °C and moisture removal was 65.17% at the medium airflow rate of 0.030 m³/h.kg. Increase of heating value was recorded from 4,041 to 9,921 kJ/kg of wet basis. Based on the moisture removal, medium airflow rate of 0.030 m³/h.kg was found the optimum. Addition of rice husk as the bulking agent improved the efficiency of biodrying due to higher moisture removal and increased energy content. |
| Year | 2013 |
| 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) | Annachhatre, Ajit P.; |
| Examination Committee(s) | Visvanathan, C.;Anal, Anil Kumar; |
| Scholarship Donor(s) | Royal Thai Government;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2013 |