Testing the SANCHO model on distribution systems

Empirical findings were used to evaluate a deterministic model of bacterial dynamics in a pipe carrying potable water. The SANCHO model simulates the response of fixed and free bacteria in the system to the concentrations of chlorine and organic substrate entering the system. The authors tested the model on seven fullscale distribution systems and made a study of the error distribution between measured values and the model's predicted values. Various simulation examples demonstrate the usefulness of the model for determining a bacterial regrowth control strategy for distribution systems. Coupled with residence time calculation software, the SANCHO model may become an important decision-making tool in the management of water distribution systems. The model is particularly useful in that it can help define the reduction thresholds for biodegradable dissolved organic carbon required to maintain a given network's quality objectives as a function of the residence time of the water in the system.

[1]  Michèle Prévost,et al.  Suspended bacterial biomass and activity in full-scale drinking water distribution systems: impact of water treatment , 1998 .

[2]  M. Edwardes,et al.  A randomized trial to evaluate the risk of gastrointestinal disease due to consumption of drinking water meeting current microbiological standards. , 1991, American journal of public health.

[3]  P. Stewart,et al.  Chlorine Penetration into Artificial Biofilm Is Limited by a Reaction−Diffusion Interaction , 1996 .

[4]  Cordelia J. Hwang,et al.  Free Chlorine Versus Monochloramine for Controlling Off-Tastes and Off-Odors , 1989 .

[5]  Claire Ventresque,et al.  Microbial Activity in GAC Filters at the Choisy-le-Roi Treatment Plant , 1991 .

[6]  M. Bourbigot,et al.  La flore bacterienne dans un reseau de distribution: Bacteria in distribution systems , 1984 .

[7]  J. Hobbie,et al.  Use of nuclepore filters for counting bacteria by fluorescence microscopy , 1977, Applied and environmental microbiology.

[8]  L. Kiene,et al.  Modelling of chlorine residual in the water distribution network of Macao , 1992 .

[9]  Z Lewandowski,et al.  Biofilms, the customized microniche , 1994, Journal of bacteriology.

[10]  Patrick Laurent,et al.  « Développement d'un modèle décrivant les variations de CODB et de biomasse bactérienne dans les réseaux de distribution » , 1995 .

[11]  A. Jadas-Hecart,et al.  Modelisation de la demande en chlore d'une eau traitee , 1992 .

[12]  William G. Characklis,et al.  Biofilms and bacterial drinking water quality , 1989 .

[13]  R. D. Morris,et al.  Chlorination, chlorination by-products, and cancer: a meta-analysis. , 1992, American journal of public health.

[14]  C. Volk,et al.  Paramètres prédictifs de l'apparition des coliformes dans les réseaux de distribution d'eau d'alimentation , 1994 .

[15]  P. Servais,et al.  Simple Method for Determination of Biodegradable Dissolved Organic Carbon in Water , 1989, Applied and environmental microbiology.

[16]  F. Azam,et al.  Protein content and protein synthesis rates of planktonic marine bacteria , 1989 .