Anaerobic digestion of Spirulina platensis using cassava pulp as co-substrate | |
| Author | Suparat Jampathong |
| Call Number | AIT Thesis no.EV-17-25 |
| Subject(s) | Cassava industry--Waste disposal Cassava industry--Environmental aspects |
| 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-17-25 |
| Abstract | The world’s energy consumption tend to increase every years. The goal of this study was to investigate anaerobic co-digestion (AcoD) of Spirulina platensis biomass as substrate and using cassava pulp as co-substrate for biogas generation. S. platensis have thickness cell wall. Thus, it need to be pretreated before using in AcoD. The pretreatment method was chose in this study was enzymatic pretreatment by using LDD 1 because this process can use in large scale due to low cost and energy consumption. LDD 1 is group of microorganisms which can secrete enzyme to digest biomass. Pretreated S. platensis ( 0.01 g of LDD 1 with 1 g of dried S. platensis) was given 11.7 mg/ml and 66.67% of soluble sugar and COD solubilisation, respectively. However, there are 8.21 mg/ml and 52.56% of soluble sugar and COD solubilisation. AcoD was carried out in laboratory scale under mesophilic condition. This study was used a semi-continuous reactors and the optimal C/N ratio was 25(Wangle, 2016). The reactors was fed by OLR of 0.5-2 kgVS/m³.d during start-up phase (91 gays) and OLR of 4 and 6 in operation phase (34 days). The reactor 1 was inoculate (pretreated S. platensis) reactor and reactor 2 was control reactor (unpretreated S. platensis). The reactor was stable in OLR of 2 kgVS/m³.d which had biogas production and CH4 content of 7.62 and 56% in reactor 1 and 7.17 and 57% in reactor 2, respectively. For the operation phase at OLR of 4 kgVS/m³.d, there are 15.72 L/d, 0.31 m³/kgVSadded, 89.38% and 76.92% of biogas production, methane yield, VS and COD removal in reactor 1, respectively. The biogas production, methane yield, VS and COD removal valve of OLR 4kgVS/m³.d were 15.13 L/d, 0.34 m³/kgVSadded, 85.93% and 66.67% in reactor 2, respectively. However, the reactor performances over OLR of 4 kgVS/m³.d were reduced. |
| Year | 2017 |
| 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) | Nguyen, Thi Kim Oanh;Shipin, Oleg V.; |
| Scholarship Donor(s) | Royal Thai Government;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2017 |