ABSTRACT Surface waters from two different sources, river and reservoir, with different dissolved... more ABSTRACT Surface waters from two different sources, river and reservoir, with different dissolved organic matter (DOM) concentrations and characters were investigated for removals using three metal coagulants, alum, a high performance aluminum polymer (HPAC) and polyaluminum chloride (PACl). Jar tests were conducted with coagulation pH ranging between 5.5 and 8.5 and doses between 5 and 16 mgAl/L. The adsorption mechanisms of DOM onto Al hydroxide precipitates of the three coagulants were investigated based on Freundlich, Langmuir and BET isotherm models. Coagulation kinetics and floc formation were studied using a photometric dispersion analyzer (PDA). For the three coagulants tested, optimum DOM removal was achieved at a coagulant dose of 11 mgAl/L and pH 6 for both waters. The lowest coagulant dose (5 mgAl/L) removed most organics with apparent molecular weights of between 2000 and 10,000 Da for both waters. DOM adsorption is best described by the BET isotherm model, indicating that DOM sorption occurred through multilayer formation in an arbitrary distribution of adsorbed particles. PACl showed the highest DOM adsorption capacity, determined by the Freundlich model. By PDA analyses, the flocculation index, average growth rate and variance values from the use of HPAC were highest in comparison with alum and PACl. The study of the coagulation kinetics suggested that HPAC produced the largest and most heterogeneous floc sizes with highest settling rates.
International Journal of Phytoremediation, Nov 9, 2015
Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu)... more Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu) mine at Kapunda, South Australia. Cu concentrations in the soils at this former mine ranged from 65 - 10107 mg kg(-1). The pH and EC varied widely in the 3.9 - 8.4 and 152 - 7311 µS ranges, respectively. Nine plant species growing over the copper mine site were selected to screen for metal uptake to determine their suitability for phytoremediation. The Australian native tree species Eucalyptus camaldulensis indicated enrichment factor (EF) of 2.17, 1.89 and 1.30 for Cu, Zn and Pb, respectively, suggesting that this species of tree can accumulate these metals to some degree. The stress-resistant exotic olive, Olea europaea exhibited EF of ≤ 0.01 for Cu, Cd and Pb, and 0.29 for Zn, which is characteristic of an excluder plant. Acacia pycnantha, the Australian pioneer legume species with EF 0.03, 0.80, 0.32 and 0.01 for Cu, Zn, Cd and Pb, respectively, emerged as another strong metal excluder and consequently is an ideal metal stabilizer.
Separation and Purification Technology, May 1, 2009
... Julie Lebegue b , Saravamuthu Vigneswaran a , Corresponding Author Contact Information , E-ma... more ... Julie Lebegue b , Saravamuthu Vigneswaran a , Corresponding Author Contact Information , E-mail The Corresponding Author , Jaya Kandasamy a and ... of mixed liquor (sludge) before and after digestion has been investigated using excitation emission matrix by Ramesh et al. ...
WSUD 2012: Water sensitive urban design; Building the water sensiitve community; 7th international conference on water sensitive urban design, 2012
ABSTRACT Stormwater is one of the last major untapped urban water resources that could be exploit... more ABSTRACT Stormwater is one of the last major untapped urban water resources that could be exploited as an alternative water source in Australia. The information in the current Australian Guidelines for Water Recycling relating to stormwater harvesting and use only emphasize a limited number of stormwater quality parameters. In order to supply stormwater as a source for higher value end-uses, a more comprehensive assessment on the potential public health risks has to be undertaken. Owing to the stochastic variations in rainfall and catchment hydrology and the types of non-point pollution sources that can provide contaminants relating to different anthropogenic activities and catchment land uses, the characterisation of public health risks in stormwater is complex, tedious and not always possible to assess through conventional detection and analytical methods. In this study, a holistic approach was undertaken to assess potential public health risks in urban stormwater samples from a medium-density residential catchment. A combined chemical-toxicological assessment was used to characterise the possible health risks from chemical pollutants, while a combination of culture methods quantitative polymerase chain reaction (qPCR) detection methods were used for detection and quantification of faecal indicator bacteria (FIB) and pathogens in urban stormwater. Preliminary results showed that the concentration of chemical pollutants and the associated toxicity was relatively low. However, the concentrations of heavy metals particularly Cadmium (Cd) and Lead (Pb) have exceeded the Australian guideline values, indicating potential public health risks. Also, high numbers of FIB were detected in stormwater samples obtained from wet weather events. In addition, qPCR detection of human-related pathogens suggested frequent sewage ingression into the urban stormwater runoff during wet weather events. Further stormwater quality monitoring study will be conducted at different contrasting urban catchments, in order to undertake a more comprehensive public health risk assessment.
A long-term monitoring investigation was carried out in a highway drainage system in Winterthur, ... more A long-term monitoring investigation was carried out in a highway drainage system in Winterthur, Switzerland. Several runoff quality and quantity simulations were carried out using the distributed model 'InfoWorks-CS'. Serial rainfall monitoring data was used for investigation of SS runoff behavior from the highway. Under continuous rainfall conditions, the quantity simulation showed a good agreement with the measured hydrograph. However, in some cases where rainfall was not continuous, overestimation of the peak height was found at the later stage after the end of the rainfall. It was believed that the initial/depression loss on the road surface was recovered during the halting period of rainfall. The consideration of regenerated depression loss significantly improved runoff simulation results in the on-and-off type rainfall events. A single event quality simulation underestimated the SS load in light rainfall events. One of the reasons was possibly inadequate consideration of pipe sediment conditions. A long term simulation was carried out to establish the initial condition of surface and pipe sediment for the target event. The newly simulated pollutograph gave a good agreement with the measured one. It revealed that it was essential to consider appropriateness of the initial condition of pipe sediment as well as surface sediment.
ABSTRACT Surface waters from two different sources, river and reservoir, with different dissolved... more ABSTRACT Surface waters from two different sources, river and reservoir, with different dissolved organic matter (DOM) concentrations and characters were investigated for removals using three metal coagulants, alum, a high performance aluminum polymer (HPAC) and polyaluminum chloride (PACl). Jar tests were conducted with coagulation pH ranging between 5.5 and 8.5 and doses between 5 and 16 mgAl/L. The adsorption mechanisms of DOM onto Al hydroxide precipitates of the three coagulants were investigated based on Freundlich, Langmuir and BET isotherm models. Coagulation kinetics and floc formation were studied using a photometric dispersion analyzer (PDA). For the three coagulants tested, optimum DOM removal was achieved at a coagulant dose of 11 mgAl/L and pH 6 for both waters. The lowest coagulant dose (5 mgAl/L) removed most organics with apparent molecular weights of between 2000 and 10,000 Da for both waters. DOM adsorption is best described by the BET isotherm model, indicating that DOM sorption occurred through multilayer formation in an arbitrary distribution of adsorbed particles. PACl showed the highest DOM adsorption capacity, determined by the Freundlich model. By PDA analyses, the flocculation index, average growth rate and variance values from the use of HPAC were highest in comparison with alum and PACl. The study of the coagulation kinetics suggested that HPAC produced the largest and most heterogeneous floc sizes with highest settling rates.
International Journal of Phytoremediation, Nov 9, 2015
Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu)... more Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu) mine at Kapunda, South Australia. Cu concentrations in the soils at this former mine ranged from 65 - 10107 mg kg(-1). The pH and EC varied widely in the 3.9 - 8.4 and 152 - 7311 µS ranges, respectively. Nine plant species growing over the copper mine site were selected to screen for metal uptake to determine their suitability for phytoremediation. The Australian native tree species Eucalyptus camaldulensis indicated enrichment factor (EF) of 2.17, 1.89 and 1.30 for Cu, Zn and Pb, respectively, suggesting that this species of tree can accumulate these metals to some degree. The stress-resistant exotic olive, Olea europaea exhibited EF of ≤ 0.01 for Cu, Cd and Pb, and 0.29 for Zn, which is characteristic of an excluder plant. Acacia pycnantha, the Australian pioneer legume species with EF 0.03, 0.80, 0.32 and 0.01 for Cu, Zn, Cd and Pb, respectively, emerged as another strong metal excluder and consequently is an ideal metal stabilizer.
Separation and Purification Technology, May 1, 2009
... Julie Lebegue b , Saravamuthu Vigneswaran a , Corresponding Author Contact Information , E-ma... more ... Julie Lebegue b , Saravamuthu Vigneswaran a , Corresponding Author Contact Information , E-mail The Corresponding Author , Jaya Kandasamy a and ... of mixed liquor (sludge) before and after digestion has been investigated using excitation emission matrix by Ramesh et al. ...
WSUD 2012: Water sensitive urban design; Building the water sensiitve community; 7th international conference on water sensitive urban design, 2012
ABSTRACT Stormwater is one of the last major untapped urban water resources that could be exploit... more ABSTRACT Stormwater is one of the last major untapped urban water resources that could be exploited as an alternative water source in Australia. The information in the current Australian Guidelines for Water Recycling relating to stormwater harvesting and use only emphasize a limited number of stormwater quality parameters. In order to supply stormwater as a source for higher value end-uses, a more comprehensive assessment on the potential public health risks has to be undertaken. Owing to the stochastic variations in rainfall and catchment hydrology and the types of non-point pollution sources that can provide contaminants relating to different anthropogenic activities and catchment land uses, the characterisation of public health risks in stormwater is complex, tedious and not always possible to assess through conventional detection and analytical methods. In this study, a holistic approach was undertaken to assess potential public health risks in urban stormwater samples from a medium-density residential catchment. A combined chemical-toxicological assessment was used to characterise the possible health risks from chemical pollutants, while a combination of culture methods quantitative polymerase chain reaction (qPCR) detection methods were used for detection and quantification of faecal indicator bacteria (FIB) and pathogens in urban stormwater. Preliminary results showed that the concentration of chemical pollutants and the associated toxicity was relatively low. However, the concentrations of heavy metals particularly Cadmium (Cd) and Lead (Pb) have exceeded the Australian guideline values, indicating potential public health risks. Also, high numbers of FIB were detected in stormwater samples obtained from wet weather events. In addition, qPCR detection of human-related pathogens suggested frequent sewage ingression into the urban stormwater runoff during wet weather events. Further stormwater quality monitoring study will be conducted at different contrasting urban catchments, in order to undertake a more comprehensive public health risk assessment.
A long-term monitoring investigation was carried out in a highway drainage system in Winterthur, ... more A long-term monitoring investigation was carried out in a highway drainage system in Winterthur, Switzerland. Several runoff quality and quantity simulations were carried out using the distributed model 'InfoWorks-CS'. Serial rainfall monitoring data was used for investigation of SS runoff behavior from the highway. Under continuous rainfall conditions, the quantity simulation showed a good agreement with the measured hydrograph. However, in some cases where rainfall was not continuous, overestimation of the peak height was found at the later stage after the end of the rainfall. It was believed that the initial/depression loss on the road surface was recovered during the halting period of rainfall. The consideration of regenerated depression loss significantly improved runoff simulation results in the on-and-off type rainfall events. A single event quality simulation underestimated the SS load in light rainfall events. One of the reasons was possibly inadequate consideration of pipe sediment conditions. A long term simulation was carried out to establish the initial condition of surface and pipe sediment for the target event. The newly simulated pollutograph gave a good agreement with the measured one. It revealed that it was essential to consider appropriateness of the initial condition of pipe sediment as well as surface sediment.
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