Treatment of modified starch wastewater by the UASB process | |
| Author | Thirasak Artsanchorn |
| Call Number | AIT Thesis no.EV-03-22 |
| Subject(s) | Starch industry-- Waste disposal Sewage sludge |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-03-22 |
| Abstract | Feasibility of 15.7-L bench scale upflow anaerobic sludge blanket (UASB) reactor performed at ambient temperature was investigated for anaerobic treatment of modified starch industry wastewater containing 6,000-9,000 mg/L of TDS. The reactor was seeded with sludge obtained from anaerobic pond treating tapioca starch wastewater. The reactor startup lasted for 99 days. The synthetic wastewater was initially fed at organic loading rate (OLR) of 4 kg CODrlmr3 .d. Upflow velocitiy of 0.25 m/h was maintained to initiate the washout of fluffy sludge. The feed concentration, OLR, and TDS concentration were increased in steps during startup period. Maximum gas production during startup period obtained on day 99 yielded volumetric gas production of 5.7 m3!m/.d. The specific methanogenic activity of the sludge increased from 0.04 g CH4-COD/g VSS.d on the onset of the experiment to 0.41 g CH4-COD/g VSS.d at the end of startup period. After successful startup, diluted supernatant wastewater containing 6,000-9,000 mg/L of TDS with COD concentration of 2,000-4,000 mg/L was fed to the reactor at OLR of 10-20 kg C0Drlmr3 .d, COD conversion efficiency of about 15-50% and volumetric gas production of 1.5-4.5 m3!m/.d were obtained during process performance experiments. The specific methanogenic activity of the sludge decreased from 0.41 g CH4-COD/g VSS.d to 0.086 g CH4-COD/g VSS.d and CH4 composition in biogas decreased from 50% to 3% at the end of the experiments due to TDS concentration of 11,000-15,000 mg/L containing in the feed. The sludge harvested from the reactor had SVl30 value of 11.14, which implied that the granular sludge was obtained at the end of the experiments. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-03-22 |
| 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) | Chongrak Polprasert ;Satoh, Hiroyasu |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship |