Drinking water treatment using upflow slow sand filtration systems in high density Cylindrospermopsis raciborskii cyanobacteria water

2017 ◽  
Vol 79 ◽  
pp. 1-8 ◽  
Author(s):  
Fernando Hymnô de Souza ◽  
Renata Iza Mondardo ◽  
Maurício Luiz Sens
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
High Density ◽  
Cylindrospermopsis Raciborskii ◽  
Sand Filtration ◽  
Slow Sand Filtration

scholarly journals Natural organic matter removal by ion exchange at different positions in the drinking water treatment lane

2013 ◽  
Vol 6 (1) ◽  
pp. 1-10 ◽  
Author(s):  
A. Grefte ◽  
M. Dignum ◽  
E. R. Cornelissen ◽  
L. C. Rietveld
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Organic Carbon ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Biological Stability ◽  
Sand Filtration ◽  
Slow Sand Filtration

Abstract. To guarantee a good water quality at the customers tap, natural organic matter (NOM) should be (partly) removed during drinking water treatment. The objective of this research was to improve the biological stability of the produced water by incorporating anion exchange (IEX) for NOM removal. Different placement positions of IEX in the treatment lane (IEX positioned before coagulation, before ozonation or after slow sand filtration) and two IEX configurations (MIEX® and fluidized IEX (FIX)) were compared on water quality as well as costs. For this purpose the pre-treatment plant at Loenderveen and production plant Weesperkarspel of Waternet were used as a case study. Both, MIEX® and FIX were able to remove NOM (mainly the HS fraction) to a high extent. NOM removal can be done efficiently before ozonation and after slow sand filtration. The biological stability, in terms of assimilable organic carbon, biofilm formation rate and dissolved organic carbon, was improved by incorporating IEX for NOM removal. The operational costs were assumed to be directly dependent of the NOM removal rate and determined the difference between the IEX positions. The total costs for IEX for the three positions were approximately equal (0.0631 € m−3), however the savings on following treatment processes caused a cost reduction for the IEX positions before coagulation and before ozonation compared to IEX positioned after slow sand filtration. IEX positioned before ozonation was most cost effective and improved the biological stability of the treated water.

scholarly journals Natural organic matter removal by ion exchange at different positions in the drinking water treatment lane

2012 ◽  
Vol 5 (1) ◽  
pp. 375-401
Author(s):  
A. Grefte ◽  
M. Dignum ◽  
E. R. Cornelissen ◽  
L. C. Rietveld
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Production Plant ◽  
Sand Filtration ◽  
Slow Sand Filtration ◽  
Operational Costs

Abstract. To guarantee a good water quality at the customers tap, natural organic matter (NOM) should be (partly) removed during drinking water treatment. The objective of this research was to improve the drinking water quality, including biological stability, by incorporating anion exchange (IEX) for NOM removal. Different placement positions of IEX in the treatment lane (IEX positioned before coagulation, before ozonation or after slow sand filtration) are compared on water quality as well as costs. For this purpose the pre-treatment plant at Loenderveen and production plant Weesperkarspel of Waternet were used as a case study. NOM removal can be done efficiently before ozonation and after slow sand filtration; it was found that the position in the treatment lane did not influence the NOM removal capacity. The operational costs were assumed to be directly dependent of the NOM removal rate and determined the difference between the IEX positions. The operational costs for IEX positioned before coagulation were higher than for IEX positioned after slow sand filtration, however the savings on following treatment processes caused a cost reduction compared to IEX positioned after slow sand filtration. IEX positioned before coagulation or ozonation were most cost effective and produced the highest water quality.

Pretreatment Process of Nanofiltration for Silting Density Index Reduction in Drinking Water Treatment System

2013 ◽  
Vol 777 ◽  
pp. 467-471 ◽  
Author(s):  
Liang Wang ◽  
Ying Chun Li ◽  
He Zhao ◽  
Zhao Hui Zhang ◽  
Bin Zhao ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Membrane Fouling ◽  
Sodium Dodecyl ◽  
Drinking Water Treatment ◽  
Hybrid Process ◽  
Transmembrane Pressure ◽  
Sand Filtration ◽  
Density Index ◽  
One Year

Calcium ions, magnesium ions, and silicate were the main reasons for the high silting density index (SDI) of natural waters. Therefore, they posed serious membrane fouling problems in the nanofiltration (NF) system, which restricted the wide application of this excellent drinking water treatment technology. In this study, the sand filtration and the micro-flocculation/sand filtration hybrid process were investigated as the pretreatment process of NF for SDI reduction. Compared with the sand filtration, the hybrid process of micro-flocculation/sand filtration was more effective for SDI reduction. When polyaluminium chloride (PAC) was used as the flocculant at a dose of 10 mg/L and the filtration rate of the sand filter was controlled at 10 m/h, the SDI value in the effluent of the pretreatment process maintained below 3. As a result, the subsequent NF system stably ran for one year. 68% CODMn was removal by NF. The membrane fouling during the operation was quite slight as the transmembrane pressure (TMP) increased by 17% after one-year use. Chemical cleaning with sodium tripolyphosphate (2%) and sodium dodecyl benzene sulfonate (0.25%) at 6 months interval could effectively recover the flux loss of the NF membrane.

Novel dual media combination for drinking water treatment

2007 ◽  
Vol 7 (5-6) ◽  
pp. 131-139 ◽  
Author(s):  
A. Mikol ◽  
C.S.B. Fitzpatrick ◽  
M.J. Chipps ◽  
M.E.J. Steele ◽  
R.G.W. Bayley
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
High Density ◽  
Low Density ◽  
Sand Filter ◽  
Suitable Alternative ◽  
Slow Sand Filter ◽  
Adequate Quality ◽  
Run Lengths

A novel media combination comprising of two layers of commercially available expanded clay (EC) media was tested for use in existing roughing filters (RF). Results have indicated a potentially suitable alternative to anthracite/sand, a dual media combination of a fine grade of high density EC media and a coarse grade of low density EC media. This novel dual media consistently achieved longer run lengths, whilst producing filtrate of adequate quality for slow sand filter influent – even when challenged with algal laden water.

Modelling the removal of p-TSA (para-toluenesulfonamide) during rapid sand filtration used for drinking water treatment

2010 ◽  
Vol 44 (1) ◽  
pp. 205-213 ◽  
Author(s):  
Raffaella Meffe ◽  
Claus Kohfahl ◽  
Ekkehard Holzbecher ◽  
Gudrun Massmann ◽  
Doreen Richter ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
Sand Filtration ◽  
Rapid Sand Filtration
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