Effect of raw water quality decrease on water treatment costs

Raw water quality variation has a great effect on drinking water treatment. To improve the adaptivity of drinking water treatment and stabilize the quality of treated water, a raw water quality assessment method, which is based upon the support vector machine (SVM), is developed in this study. Compared to existing raw water quality assessment methods, the assessment method studied herein is oriented to drinking water treatment and can directly be used for the control of the chemical (alum and ozone) dosing process. To this end, based upon the productive experiences and the analysis of the operating data of water supply, a raw water quality assessment standard oriented to drinking water treatment is proposed. A raw water quality model is set up to assess the raw water quality based upon the SVM technique. Based upon the raw water quality assessment results, a feedforward–feedback control scheme has been designed for the chemical dosing process control of drinking water treatment. Thus, the chemical dosage can be adjusted in time to cope with raw water quality variations and hence, the quality of the treated water is stabilized. Experimental results demonstrate the improved effectiveness of the proposed method of raw water quality assessment and the feedforward–feedback control scheme.

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Case study to evaluate the influence of the SolarBees and dossage on the water quality of the Rietvlei Dam Water Treatment Plant.

Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie ◽

10.4102/satnt.v31i1.282 ◽

2012 ◽

Vol 31 (1) ◽

Author(s):

S. Booyens ◽

D. De Vos ◽

Sandra Barnard ◽

Leanne Coetzee

Keyword(s):

Water Quality ◽

Water Treatment ◽

Water Samples ◽

Treatment Plant ◽

Water Treatment Plant ◽

Raw Water ◽

Raw Water Quality ◽

The Difference

The aim of this project was to investigate the influence of the SolarBees and dosage on the water quality at Rietvlei Dam WTP. The difference between the raw and final water samples was less than anticipated due to the drastic improvement in raw water quality of Rietvlei Dam.

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The challenge of improving the efficiency of drinking water treatment systems in rural areas facing changes in the raw water quality

South African Journal of Chemical Engineering ◽

10.1016/j.sajce.2021.05.010 ◽

2021 ◽

Author(s):

Fernando García-Ávila ◽

Alex Avilés-Añazco ◽

Esteban Sánchez-Cordero ◽

Lorgio Valdiviezo-Gonzáles ◽

María D. Tonon Ordoñez

Keyword(s):

Water Quality ◽

Drinking Water ◽

Water Treatment ◽

Rural Areas ◽

Drinking Water Treatment ◽

Raw Water ◽

Raw Water Quality

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Optimisation of coagulation and chlorination in drinking water treatment: laboratory and full-scale studies

Water Science & Technology Water Supply ◽

10.2166/ws.2002.0055 ◽

2002 ◽

Vol 2 (2) ◽

pp. 131-137

Author(s):

N.D. Basson ◽

C.F. Schutte

Keyword(s):

Water Quality ◽

Large Fraction ◽

Drinking Water Treatment ◽

Agricultural Runoff ◽

Treatment Costs ◽

Full Scale ◽

Raw Water ◽

Activated Carbon Adsorption ◽

Treated Effluent ◽

Quality Optimisation

The paper deals with laboratory and full-scale studies aimed at optimising treatment processes at the Balkfontein plant of Sedibeng Water in South Africa. The raw water is highly eutrophic and contains a large fraction of treated effluent from domestic and industrial sources as well as agricultural runoff. The eutrophic nature and changing raw water quality give rise to many operational difficulties and high treatment costs as well as problems with the final water quality. Optimisation of the coagulation and chlorination processes was seen as a cheaper solution to these problems than to install advanced processes such as ozonation and activated carbon adsorption that would add greatly to treatment costs. The laboratory studies indicated that through optimisation of coagulation-flocculation and by replacement of pre-chlorination by intermediate chlorination (after primary sedimentation) most of the treatment problems could be solved and final water of the required quality produced without a large increase in treatment costs.

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Monitoring raw water quality and adjustment of treatment processes – experiences at the wahnbach reservoir

Water Science & Technology ◽

10.2166/wst.1998.0100 ◽

1998 ◽

Vol 37 (2) ◽

pp. 43-48 ◽

Cited By ~ 1

Author(s):

Oluf Hoyer ◽

Helmut Schell

Keyword(s):

Water Quality ◽

Effective Control ◽

Raw Water ◽

Titration Method ◽

Treatment Processes ◽

On Line ◽

Raw Water Quality

On-line monitoring of turbidity allows effective control of source and finished water quality. Fundamentals for particle destabilisation and removal are outlined and the application of the charge titration method for optimal online adjustment of the flocculant dosage is presented.

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