Treatment of inhibitory phenolic compounds by membrane bioreactor | |
| Author | Quach Thi Thu Thuy |
| Call Number | AIT Thesis no. EV-03-17 |
| Subject(s) | Membrane reactors Phenols |
| 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-03-17 |
| Abstract | Membrane bioreactor has become vital technology in wastewater and water treatment. Phenolic compounds produced from industries cause problem for conventional treatment due to its toxic and inhibitory. Two membrane bioreactor systems namely are activated sludge coupled with membrane bioreactor (AS-MBR) and biogical activated carbon (GAC dose of 5 g/L) coupled with membrane bioreator (BAC-MBR), were studied with different phenolic compounds concentrations and different hydraulic retention times (HRT): 500 mg/L phenol under 6, 12, 8 and 5 hour-HRT, 500 mg/L phenol+ 50 mg/L 2,4-DCP under 8 hour-HRT, 500 mg/L phenol+ 100 mg/L 2,4-DCP under 8 hour-HRT). Adsorption and biosorption of phenol also were done. The performance of MBR systems was evaluated and compared based on treatment efficiency, membrane fouling and sludge characteristics. MBR systems provided reveal good removal efficiency under all the investigations. In phenol 500 mg/L run under HRTs of 16, 12, 8, and 5 hours, both AS-MBR and BAC-MBR gave the phenol, TOC and COD removal more than 98.99% with the organic loading range from 1.80 to 5.76 kg/m3.d as COD and there were no significant deference among four HR Ts in terms of phenol, TOC and COD removal. In phenol+ 50 and 100 mg/L 2,4-DCP run under 8 hour-HRT, both AS-MBR and BAC-MBR gave removal efficiency of 99 % as phenol and 2,4-DCP and 95% as TOC. Previous study of phenol adsorption and biosorption showed the low phenol removal by those processes. Adsorption capacity of GAC and biomass were 12.3 mg/g GAC and 10-6 mg/gVSS. It indicated the phenol removal was done mostly by biodegradation. Membrane resistance was low at both BAC-MBR (13.57 kPa) and AS-MBR (12.66 kPa). It showed the effect of reactor design in preventing fouling. TMP of the BAC-MBR system increased with linear trend while that of AS-MBR suddenly increased from 63rd day. The reason would be the difference in sludge characteristics and behaviors. Sludge characteristics were monitored in terms of settleability (diluted sludge volume index (DSVI) test), dewatering (capillary suction time (CST) test), viscosity and EPS (bound and soluble). BAC-MBR sludge produced more bound EPS but less soluble EPS, PIC ratio was low in bound EPS and higher soluble EPS compare with those in AS-MBR. Other sludge characteristic parameters such as SVI, CST, and viscosity were found higher in BAC-MBR except MLSS and there were their correlation: EPS and CST, CST and viscosity were proportional. SVI and EPS were not correlated but P/C and EPS. It would results from the effect of P IC on hydrophobic and surface charge properties of sludge. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-03-17 |
| 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) | Visvanathan, C. |
| Examination Committee(s) | Nguyen Cong Thanh ;Satoh, Hiroyasu |
| Scholarship Donor(s) | Swedish International Development Cooperation |