Effect of zero-valent iron amendment on the performance of biosand filters

2019 ◽  
Vol 19 (6) ◽  
pp. 1612-1618 ◽  
Author(s):  
Duithy George ◽  
M. Mansoor Ahammed
Keyword(s):  
Water Quality ◽  
Quality Standards ◽  
Zero Valent Iron ◽  
Water Quality Standards ◽  
Sharp Decline ◽  
Biosand Filter ◽  
Bacterial Removal ◽  
Long Duration ◽  
Log10 Unit ◽  
Filter Operation

Abstract The study compared the performance of a biosand filter (BSF) with two BSFs modified by introducing a layer of zero-valent iron (ZVI) during a long-duration test (4 months) mimicking the household use pattern in developing countries. Results of the study showed that for bacterial removal, ZVI-amended BSFs outperformed the BSF by at least 1 log10 unit throughout the filter operation. Effluent turbidity in the BSF and modified BSFs was not significantly influenced by influent values for the turbidity range tested in the study (17.0–45.4 NTU). Removal efficiency of nitrates was higher in the modified BSFs, with up to ∼89% removal in the modified BSFs compared with ∼29% in the BSF. Sharp decline in dissolved oxygen (DO) was observed during the passage of water through the filters. The DO decline was more in the modified filters compared with the conventional BSF. Effluent iron remained within the drinking-water quality standards. The study thus indicates the potential of ZVI to improve the performance of BSFs.

scholarly journals Assessment of Quality of Groundwater in Kandarvakottai and Karambakudi Areas of Pudukkottai District, Tamilnadu, India

2009 ◽  
Vol 6 (3) ◽  
pp. 898-904
Author(s):  
D. Ilangeswaran ◽  
R. Kumar ◽  
D. Kannan
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Physicochemical Parameters ◽  
Quality Standards ◽  
Physicochemical Characteristics ◽  
Total Dissolved Solids ◽  
Water Quality Standards ◽  
Standard Procedures ◽  
Groundwater Samples

Various samples of groundwater were collected from different areas of Kandarvakottai and Karambakudi of Pudukkottai District, Tamilnadu and analyzed for their physicochemical characteristics. The results of this analysis were compared with the water quality standards of ISI, WHO and CPHEEO. In this analysis the various physicochemical parameters such as pH, electrical conductivity, turbidity, total dissolved solids, Cl-, F-, SO42-, PO43-, NO3-, NO2-, CN-, Nas+, K+, NH3, Mn, Fe, Ca & Mg hardnessetc., were determined using standard procedures. The quality of groundwater samples were discussed with respect to these parameters and thus an attempt were made to ascertain the quality of groundwater used for drinking and cooking purposes in and around Kandarvakottai and Karambakudi areas.

An assessment of the impact of the proposed EU bathing water directive on Irish coastal bathing area compliance

2005 ◽  
Vol 51 (3-4) ◽  
pp. 225-230 ◽  
Author(s):  
R. Chawla ◽  
K. Real ◽  
B. Masterson
Keyword(s):  
Water Quality ◽  
Quality Standards ◽  
Water Quality Standards ◽  
Microsoft Excel ◽  
Microbial Water Quality ◽  
Bathing Water Directive ◽  
Bathing Water ◽  
Good Classification ◽  
The Impact

An assessment of the impact of the new microbial water quality standards of the proposed EU Bathing Water Directive on the classification of designated Irish coastal bathing areas is presented. The new standards are applied retrospectively to the microbial water quality results for the bathing seasons of 1999, 2000 and 2001, and the outcome is compared with that recorded under the present Bathing Water Directive. A Microsoft EXCEL application was developed to generate the retrospective bathing area classifications according to the proposed Directive (Excellent, Good, Poor). It was found that the number of Irish coastal bathing areas not attaining ‘Excellent’ classification (as would be required at present for the Blue Flag award) was trebled; the number attaining ‘Good’ classification was increased by about 50%, and the number attracting ‘Poor’ classification (equivalent to ‘Fail’ under the present Directive) was increased nine-fold. Some of the shortcomings of the proposed Directive and suggestions for its revision are discussed.

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