Journal Articles - Engineering - 2019

Permanent URI for this collection

http://repository.vlu.edu.vn:443/handle/123456789/150

Browse

Browsing Journal Articles - Engineering - 2019 by Author "Dương Phạm Hùng"
  • Publication
    A new combination treatment system of ozonation and electrocoagulation for C.I Acid Red 114 dye removal from dyeing wastewater
    ( 2018)
    Ngoc han T.Huynh
    ;
    Dương Phạm Hùng
    ;
    Yong Soon
    In this study, a combined system integrating an ozonation reactor and electrocoagulation (EC) reactor was investigated to remove C.I Acid Red 114 (AR 114) dye in the synthetic dyeing wastewater. The separated EC and ozonation systems were performed as control experiments as well. Hydraulic retention time (HRT) of each system was determined. These systems were operated with 100 mg/L AR 114 dye wastewater at determined optimal conditions. The results showed that colour, dye and CODcr were highly removed by the combined system with only the HRT of 2 min in the ozonation reactor and 0.85 min in the EC reactor. Their average efficiencies were archived up to 93%, 94.25% and 80.6%, respectively. In addition, the energy consumption, volume and mass of waste sludge were evaluated to be low (0.4 kWh/m3, 30 L/m3 and 77 g/m3). When compared between the combined system and the control systems based on the same decolorization performance, the results indicated that the combined system has shorter HRT, less energy consumption than others and less waste sludge generation than the separated EC system.
  • Publication
    Removal of ammonia nitrogen in wastewater by indirect mechanism using electrochemical with Platinum electrode as anode Nature Environment and Pollution Technology
    ( 2018)
    Dương Phạm Hùng
    ;
    Cong Minh Pham
    ;
    Ngoc han T.Huynh
    ;
    Yong Soon
    In this study, platinum (Pt) electrode was used as an anode to remove ammonia in the wastewater by electrolysis. The batch experiments were carried out with various ammonia concentrations in the synthetic wastewater at ambient temperature with and without chloride ions. The results indicated that the optimal condition was pH = 7.0 and current density of 10 mA/cm2. The added NaCl concentration had a significant effect on both, the ammonia removal rate and energy consumption. The ammonia removal performance was 99% with initial ammonia concentration of 25 mg/L after 70 min electrolysis at i=20 mA/cm2; pH 7.0 and 0.03% NaCl. The response functions described the correlation of four variables with NH3 concentration, and NH3 removal efficiency was determined by the response surface methodology (RMS), ANOVA tool with R2 NH3-N = 0.945 and R2 Eff = 0.871