http://hdl.handle.net/10453/163 2013-05-21T03:05:36Z 2013-05-21T03:05:36Z Guo Wenshan Ngo Huu Hao Vigneswaran Saravanamuth Xing Wen Goteti Pavan http://hdl.handle.net/10453/12773 2012-12-10T22:08:30Z 2008-01-01T00:00:00Z

A Novel Sponge-Submerged Membrane Bioreactor (SSMBR) for Wastewater Treatment and Reuse Guo Wenshan; Ngo Huu Hao; Vigneswaran Saravanamuth; Xing Wen; Goteti Pavan Membrane fouling has been regarded as one of the biggest challenges to widespread application of membrane bioreactor (MBR). This study focuses on minimizing the membrane fouling and improving the performance of submerged membrane bioreactor (SMBR) by porous sponge addition. The effects of sponge addition on sustainable flux and membrane fouling were investigated. Acclimatized sponge could significantly increase the suspended growth in SMBR with biomass of 16.7 g/L(sponge). With the sponge volume fraction of 10%, SSMBR could enhance sustainable flux up to 50 L/m2 · h compared with sustainable flux of SMBR (only 25 L/m2 · h). SSMBR also exhibited excellent results in terms of DOC removal (over 95%), COD removal (over 97%), lower transmembrane pressure development, and oxygen uptake rate. Over 89% of NH4-N and 98% of PO4-P were removed when SSMBR was operated with a MLSS concentration of 15 g/L.

2008-01-01T00:00:00Z Xing Wen Ngo Huu Hao Kim Seoung-Hyun Guo Wenshan Hagare Prasanthi http://hdl.handle.net/10453/12771 2012-12-10T23:37:12Z 2008-01-01T00:00:00Z

Physico - Chemical processes for landfill Leachate Treatment: Experiments and Mathematical Models Xing Wen; Ngo Huu Hao; Kim Seoung-Hyun; Guo Wenshan; Hagare Prasanthi

2008-01-01T00:00:00Z Shon Ho Kyong Okour Yousef El Saliby Ibrahim Park J Cho D Kim J Park H Kim J http://hdl.handle.net/10453/11790 2013-05-08T01:50:09Z 2009-01-01T00:00:00Z

Preparation and Characterisation of Titanium dioxide Produced from Ti-salt Flocculated Sludge in Water Treatment Shon Ho Kyong; Okour Yousef; El Saliby Ibrahim; Park J; Cho D; Kim J; Park H; Kim J In this study, titanium (Ti), ferric (Fe) and aluminum (Al) salt flocculants were compared for their efficiency in treating wastewater collected from Sydney Olympic Park wastewater treatment plant by following the jar test procedure. Produced sludge from Ti-salt flocculation was dried and titanium dioxide (TiO2) nanoparticles were generated after the incineration of sludge produced from the Ti-salt flocculation of wastewater. Later on, titanate nanotubes were synthesized after TiO2 nanoparticles were hydrothermally treated with 10 N NaOH solution at 130 °C for 24 h. Titanate nanotubes were either acid or deionised water-washed, while thiourea-doping was employed to produce visible light-responsive nanotubes. Wastewater flocculation using Ti-salt was found to be as efficient as Fe and Al flocculation in terms of turbidity and DOC removal. XRD results showed that the anatase structure was predominant for TiO2 nanoparticles, while thiourea-doped titanate nanotubes only indicated anatase structure with an increased crystallinity after being crystallized at 600 °C. The photocatalytic activity of all photocatalysts was evaluated using the photooxidation of acetaldehyde. Thiourea-doped nanotubes showed a greater photocatalytic activity than as-prepared TiO2 nanoparticles, deionised water-washed, acid-washed titanate nanotubes and P25 under UV and visible light irradiation.

2009-01-01T00:00:00Z Guo Wenshan Ngo Huu Hao Vigneswaran Saravanamuth Dharmawan Fonny Nguyen Tien Aryal Rupak http://hdl.handle.net/10453/8499 2012-12-10T23:03:18Z 2009-01-01T00:00:00Z

Effect of different flocculants on short-term performance of submerged membrane bioreactor Guo Wenshan; Ngo Huu Hao; Vigneswaran Saravanamuth; Dharmawan Fonny; Nguyen Tien; Aryal Rupak This study aims at evaluating the impacts of flocculant addition to a submerged membrane bioreactor (SMBR). Three types of common flocculants (FeCl3, PACl and chitosan) were tested based on the performance of organic and nutrients removal, respiration test and fouling control. The data showed that all of the flocculants not only could keep high removal efficiencies of DOC and COD (>90%) compared to SMBR alone, but also exhibited different advantages and disadvantages according to the properties of the flocculants. For instance, inorganic flocculants strongly affected the nitrification process and organic flocculant addition slightly reduced the phosphorus removal efficiency in SMBR. After adding FeCl3 and PACl, NH4-N removal decreased to 31.9% and 11.1%, while T-N removal dropped to 22% and 0.5% respectively. Although flocculants addition improved sludge settleability and oxygen transfer to some extent, organic flocculant obtained more stable sludge volume indexes (SVI) and specific oxygen uptake rates (SOUR) than those of inorganic flocculants. Inorganic flocculants, on the other hand, led to more reduction of soluble microbial products (SMP) present in mixed liquor and lower membrane fouling rates (1.3 and 2.6 kPa/day for FeCl3 and PACl respectively).

2009-01-01T00:00:00Z