A practical guide for determining appropriate chemical dosages for direct filtration

Tchio, Maurice; Koudjonou, Boniface; Desjardins, Raymond L.; Prévost, Michèle; Barbeau, Benoît

doi:10.1139/l03-037

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…Cornwell et al (2003) demonstrated Cryptosporidium removal using spore monitoring at year. Tchio et al (2003) after conducting tests proposed a rapid and simple laboratory method for determining the appropriate dosages of chemicals according to filtering materials effective size (ES), for direct filtration applications, and for adjusting the dosages according to raw water quality changes.…”

Section: Filtrationmentioning

confidence: 99%

Physico‐Chemical Processes

Ahmad¹,

Begum²,

Hoek³

et al. 2004

Water Environment Research

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In this chapter, the physicochemical processes used in the treatment of aqueous streams such as domestic and industrial wastewaters, drinking water, contaminated groundwater, and aqueous residuals from soil treatment are reviewed. Processes that have their own chapter in the WEF review are not included in this chapter. MEMBRANE PROCESSES GENERALMembrane technology is widely accepted as a means of producing various qualities of water from surface water, well water, brackish water, and seawater.Membrane technology is also used in industrial processes and in industrial wastewater treatment, and lately membrane technology has moved into the area of treating secondary and tertiary municipal wastewater and oil field produced water (Nicolaisen, 2003). In many cases one membrane process is followed by another with the purpose of producing water of increasing purity and quality for various purposes. One type of membrane may thus enhance the function of another to meet goals ranging from disposal of wastewater to production of drinking water from alternative sources. 824 Membrane technologies offer the possibility of managing the total water resources in a region, which is of special interest in geographical areas where natural water resources are scarce. A recent project entitled Novel Technologies for Drainage Water Treatment financed by Egyptian Academy of Scientific Research and Technology (ASRT) and executed by National Research Center (NRC) comprised a detailed assessment of the desalting technologies for reclamation of agricultural drainage water (ADW) (Abulnour et al., 2003). This paper addresses the comparative techno-economics of the following systems (a) activated carbon (AC)-ultrafiltration (UF)-reverse osmosis (RO), (b) UF-electrodialysis reversal (EDR)-RO, (c) AC-ED-ion exchange (IE), (d) microfiltration (MF)-UF-RO1-RO2 and (e) slow sand filtration (SSF)-AC-IE. The results reveal that treatment scheme (d) MF-UF-RO1-RO2 provides the lowest cost production of high quality water. The most important recommendations point to the importance of field demonstration in selected locations to explore system reliability and performance under actual applications.The increasing need for water in arid regions of the world has resulted in the emergence of new water re-use technologies. The success of water re-use projects however, does not just depend on the effectiveness and suitability of the technology, but also on the presence of an institutional framework that ensures that the treated water can be distributed and used safely and efficiently. These two diverse issues were examined by MWH in projects carried out in Egypt and in the USA (Lawrence et al., 2003). One project in the East Bank of Cairo assessed the potential benefits of treated wastewater for irrigation in agricultural schemes. The project demonstrated enhanced 825 crop yields but that additional treatment of the wastewater was required to improve its microbiological quality to the standards required by both international and Egyptian legislation for safe re...

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Section: Filtrationmentioning

confidence: 99%

Physico‐Chemical Processes

Ahmad¹,

Begum²,

Hoek³

et al. 2004

Water Environment Research

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Machine learning approaches to predict coagulant dosage in water treatment plants

Zhang

Achari

et al. 2013

Int J Syst Assur Eng Manag

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Comparison of two online flocculation monitoring techniques for predicting turbidity removal by granular media filtration

Ball

Carrière

Barbeau

2011

Environmental Technology

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Particulate matter removal in drinking water treatment via direct granular filtration requires specific flocculation conditions (a process typically termed 'high energy flocculation'). Predicting filtered water turbidity based on flocculated water characteristics remains difficult. This study has sought to establish a relationship between filtered water turbidity and the flocculated water characteristics. Flocculation oflow-turbidity raw water was evaluated online using a Photometric Dispersion Analyser (PDA) and a Dynamic Particle Analyser in a modified jar test followed by a bench-scale anthracite filter. Coagulants used were alum, PASS100 and ferric sulphate, in addition to a polydiallyldimethylammonium chloride (polyDADMAC) cationic polymer. They were dosed in warm and cold waters, and flocculated with intensities (G) from 0 to 100 s(-1). Of the two instruments selected to analyse flocculation performance, the Dynamic Particle Analyser was shown to be the most sensitive, detecting small changes in floc growth kinetics and even floc growth under low flocculation conditions which remained undetected by the PDA. Floc size was shown to be insufficient in predicting particulate matter removal by direct granular filtration as measured by turbidity, although a threshold d(v) value (50 microm) could be identified for the test conditions evaluated in this project, above which turbidity was systematically lower than 0.2 NTU.

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A practical guide for determining appropriate chemical dosages for direct filtration

Cited by 4 publications

References 6 publications

Physico‐Chemical Processes

Physico‐Chemical Processes

Machine learning approaches to predict coagulant dosage in water treatment plants

Comparison of two online flocculation monitoring techniques for predicting turbidity removal by granular media filtration

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