A comparative study of three different assimilable organic carbon (AOC) methods: results of a round-robin test

2013 ◽  
Vol 13 (4) ◽  
pp. 1024-1033 ◽  
Author(s):  
P. S. Ross ◽  
F. Hammes ◽  
M. Dignum ◽  
A. Magic-Knezev ◽  
B. Hambsch ◽  
...  
Keyword(s):  
Drinking Water ◽  
Organic Carbon ◽  
Bacterial Growth ◽  
Distribution Networks ◽  
Round Robin ◽  
Biological Stability ◽  
Bacterial Strains ◽  
Round Robin Test ◽  
Assimilable Organic Carbon ◽  
Wide Range

Easily assimilable organic carbon (AOC) is frequently used for the assessment of the biological stability of drinking water, which is an important consideration in the control of bacterial growth in distribution networks. The first AOC bioassay was developed in 1982 and is based on growth of two bacterial strains (Pseudomonas fluorescens P17 and Spirillum spp. NOX) in drinking water relative to their growth on acetate. Much research was subsequently conducted to modify, simplify and increase the speed of the assay which resulted in a number of alternative AOC assays. Application of these assays raises legitimate questions about the comparison of AOC data from different studies. In the present study, a round-robin test was performed to evaluate the correlation between three established AOC methods. A total of 14 water samples, covering a wide range of AOC concentrations, were analyzed with the original ‘van der Kooij’ method, the ‘Werner & Hambsch’ method and ‘Eawag’ method. Good correlations were found between AOC concentrations measured with the various methods. The data suggest an acceptable compatibility between different AOC methods, although deviations between the methods call for careful interpretation and reporting of AOC data.

Occurrences and changes in bacterial growth-promoting nutrients in drinking water from source to tap: A review

2021 ◽  
Author(s):  
Jiwon Park ◽  
Jin Hyung Noh ◽  
Thi Huyen Duong ◽  
Sang-Yeop Chung ◽  
Heejong Son ◽  
...  
Keyword(s):  
Drinking Water ◽  
Organic Carbon ◽  
Bacterial Growth ◽  
Assimilable Organic Carbon ◽  
Growth Promoting ◽  
Community Changes

Biostable drinking water, which does not support bacterial growth and community changes, is obtained by removing bacterial growth-promoting nutrients, such as assimilable organic carbon (AOC), through a range of treatment...

scholarly journals Effects of Assimilable Organic Carbon and Free Chlorine on Bacterial Growth in Drinking Water

PLoS ONE ◽  
2015 ◽  
Vol 10 (6) ◽  
pp. e0128825 ◽  
Author(s):  
Xiaolu Liu ◽  
Jingqi Wang ◽  
Tingting Liu ◽  
Weiwen Kong ◽  
Xiaoqing He ◽  
...  
Keyword(s):  
Drinking Water ◽  
Organic Carbon ◽  
Bacterial Growth ◽  
Free Chlorine ◽  
Assimilable Organic Carbon

Research on Drinking Water Biological Stability in Water Supply Network

2012 ◽  
Vol 518-523 ◽  
pp. 3735-3739
Author(s):  
Dong Sheng Dai ◽  
Song Hu Li ◽  
Jie Li
Keyword(s):  
Drinking Water ◽  
Organic Carbon ◽  
Yellow River ◽  
Plate Count ◽  
Available Phosphorus ◽  
Biological Stability ◽  
Heterotrophic Plate Count ◽  
Assimilable Organic Carbon ◽  
Jinan City ◽  
Biodegradable Dissolved Organic Carbon

The Assimilable Organic Carbon (AOC), Microbially Available Phosphorus (MAP), Heterotrophic Plate Count (HPC) and Biodegradable Dissolved Organic Carbon (BDOC) of eight sampling points were analyzed for studying the biological stability of drinking water in Jinan. Biological stability of drinking water can standard basically in Jinan city. There had a certain correlation between AOC and HPC. The AOC indicator was gradual increased from April to May and June to July. There may be related to the seasonal change of Yellow River. The control of AOC was an effective way to improve the water quality.

The Effect of UV Disinfection on Biological Stability in Drinking Water Supply Network

2012 ◽  
Vol 518-523 ◽  
pp. 1001-1005
Author(s):  
Dong Sheng Dai ◽  
Song Hu Li ◽  
Jie Li
Keyword(s):  
Drinking Water ◽  
Organic Carbon ◽  
Water Supply ◽  
Drinking Water Supply ◽  
Uv Disinfection ◽  
Supply Network ◽  
Biological Stability ◽  
Water Supply Network ◽  
Assimilable Organic Carbon ◽  
Jinan City

In this paper,the assimilable organic carbon (AOC) and the total number of colonies were deterimined for studying the effect of Ultraviolet (UV) disinfection of drinking water at Dianliu Pressure Station, Jinan City. The result showed that the total number of colonies on average decreased 28.7% campared with the initial values. However, the value of AOC increased 47.6%, 83.8 % and 181.9 % after UV disinfection power strengthened. Therefore, the application of UV disinfection of drinking water still need further study to evaluate the disinfection effect.

A systematic approach for the assessment of bacterial growth-controlling factors linked to biological stability of drinking water in distribution systems

2016 ◽  
Vol 16 (4) ◽  
pp. 865-880 ◽  
Author(s):  
E. I. Prest ◽  
F. Hammes ◽  
S. Kötzsch ◽  
M. C. M. van Loosdrecht ◽  
J. S. Vrouwenvelder
Keyword(s):  
Drinking Water ◽  
Organic Carbon ◽  
Bacterial Growth ◽  
Distribution System ◽  
Distribution Systems ◽  
Systematic Approach ◽  
Controlling Factors ◽  
Full Scale ◽  
Growth Potential ◽  
Biological Stability

A systematic approach is presented for the assessment of (i) bacterial growth-controlling factors in drinking water and (ii) the impact of distribution conditions on the extent of bacterial growth in full-scale distribution systems. The approach combines (i) quantification of changes in autochthonous bacterial cell concentrations in full-scale distribution systems with (ii) laboratory-scale batch bacterial growth potential tests of drinking water samples under defined conditions. The growth potential tests were done by direct incubation of water samples, without modification of the original bacterial flora, and with flow cytometric quantification of bacterial growth. This method was shown to be reproducible (ca. 4% relative standard deviation) and sensitive (detection of bacterial growth down to 5 µg L−1 of added assimilable organic carbon). The principle of step-wise assessment of bacterial growth-controlling factors was demonstrated on bottled water, shown to be primarily carbon limited at 133 (±18) × 103 cells mL−1 and secondarily limited by inorganic nutrients at 5,500 (±1,700) × 103 cells mL−1. Analysis of the effluent of a Dutch full-scale drinking water treatment plant showed (1) bacterial growth inhibition as a result of end-point chlorination, (2) organic carbon limitation at 192 (±72) × 103 cells mL−1 and (3) inorganic nutrient limitation at 375 (±31) × 103 cells mL−1. Significantly lower net bacterial growth was measured in the corresponding full-scale distribution system (176 (±25) × 103 cells mL−1) than in the laboratory-scale growth potential test of the same water (294 (±35) × 103 cells mL−1), highlighting the influence of distribution on bacterial growth. The systematic approach described herein provides quantitative information on the effect of drinking water properties and distribution system conditions on biological stability, which can assist water utilities in decision-making on treatment or distribution system improvements to better control bacterial growth during water distribution.

Improving the biological stability of drinking water by ion exchange

2011 ◽  
Vol 11 (1) ◽  
pp. 107-112 ◽  
Author(s):  
A. Grefte ◽  
M. Dignum ◽  
S. A. Baghoth ◽  
E. R. Cornelissen ◽  
L. C. Rietveld
Keyword(s):  
Drinking Water ◽  
Organic Carbon ◽  
Ion Exchange ◽  
Biofilm Formation ◽  
Formation Rate ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Biological Stability ◽  
Biological Activated Carbon ◽  
Pre Treatment

To guarantee a good water quality at the consumer’s tap, natural organic matter (NOM) should be (partly) removed during drinking water treatment. The objective of this research is to measure the effect of NOM removal by ion exchange on the biological stability of drinking water. Experiments were performed in two lanes of the pilot plant of Weesperkarspel in the Netherlands. The lanes consisted of ozonation, softening, biological activated carbon filtration and slow sand filtration. Ion exchange in fluidized form was used as pre-treatment in one lane and removed 50% of the dissolved organic carbon (DOC); the other lane was used as reference. Compared to the reference lane, the assimilable organic carbon (AOC) concentration of the finished water in the lane pretreated by ion exchange was 61% lower. The biofilm formation rate of the finished water was decreased with 70% to 2.0 pg ATP/cm2.day. The achieved concentration of AOC and the values of the biofilm formation rate with ion exchange pre-treatment showed that the biological stability of drinking water can be improved by extending a treatment plant with ion exchange, especially when ozonation is involved as disinfection and oxidation step.

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