Effects of pre-ozonation and selected advanced water treatment processes on Mount Seymour impoundment water

2001 ◽  
Vol 1 (2) ◽  
pp. 83-90 ◽  
Author(s):  
C. Bonneville ◽  
D.W. Smith
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Treatment Process ◽  
Advanced Treatment ◽  
Subsequent Removal ◽  
Dissolved Air Flotation ◽  
Filter Performance ◽  
Treatment Processes ◽  
Small Doses ◽  
Dissolved Air

In May 1999, a project using a dissolved air flotation (DAF)/ozone/filtration pilot plant was started to study the effects of pre-ozonation on the flocculation of particles and removal of organic matter in an advanced treatment process. Results indicate that small doses of ozone pre-ozonation slightly improve the flocculation of particles and their subsequent removal in the DAF unit when used in conjunction with alum or PACl. However, it was found that high ozone doses impeded flocculation. More significant is ozone's benefit for the removal of UV-absorbing organic matter. The study also found that DAF is very effective at removing turbidity causing particles and colour from the water, thereby improving filter performance.

Evaluation of flocculation and dissolved air flotation as an advanced wastewater treatment

2001 ◽  
Vol 43 (8) ◽  
pp. 83-90 ◽  
Author(s):  
A. C. Pinto Filho ◽  
C. C. Brandão
Keyword(s):  
Wastewater Treatment ◽  
Domestic Wastewater ◽  
High Rate ◽  
Advanced Treatment ◽  
Dissolved Air Flotation ◽  
Anaerobic Reactor ◽  
Treatment Processes ◽  
Domestic Wastewater Treatment ◽  
Air Flotation ◽  
Dissolved Air

A bench scale study was carried out in order to evaluate the applicability of dissolved air flotation (DAF) as an advanced treatment for effluents from three different domestic wastewater treatment processes, namely: (i) a tertiary activated sludge plant ; (ii) an upflow sludge blanket anaerobic reactor (UASB); and (iii) a high-rate stabilization pond.

Cryptosporidium removal during water treatment using dissolved air flotation

1995 ◽  
Vol 31 (3-4) ◽  
pp. 125-135 ◽  
Author(s):  
T. Hall ◽  
J. Pressdee ◽  
R. Gregory ◽  
K. Murray
Keyword(s):  
Water Treatment ◽  
Metal Ion ◽  
Ion Concentration ◽  
Sudden Increase ◽  
Water Turbidity ◽  
Dissolved Air Flotation ◽  
Treatment Processes ◽  
Air Flotation ◽  
The Uk ◽  
Dissolved Air

The occurrence of the protozoan parasite Cryptosporidium parvum in water supplies, and the resultant outbreaks of cryptosporidiosis in the UK and USA, have led to concern over the ability of conventional water treatment processes to remove Cryptosporidia from water sources. Large scale pilot plant trials of water treatment have been carried out in the UK to establish the degree of removal that can be achieved by a range of treatment processes, including dissolved air flotation, and to compare the performance of different treatment options. Results from part of these trials are presented in this paper. These results suggest that well operated chemical coagulation based treatment, using either dissolved air flotation or floc blanket clarification, should be capable of achieving removal of Cryptosporidium oocysts of over 99%. There was no evidence of differences in performance between the different types of filter media investigated. The risk of increased Cryptosporidium concentration in the filtered water will increase as filtrate turbidity increases. However, other factors such as high coagulant metal-ion concentration in the filtered water, or a sudden increase in clarified water turbidity, without any increase in filtered water turbidity, may also indicate treatment problems and associated risk from Cryptosporidia. Recycling of backwash waters may also increase the risk.

Advanced Treatment of Drinking Water by Ultrafiltration Membrane

2013 ◽  
Vol 647 ◽  
pp. 543-547 ◽  
Author(s):  
Yi Xin Yang ◽  
Jie Chen
Keyword(s):  
Molecular Weight ◽  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Ultrafiltration Membrane ◽  
Advanced Treatment ◽  
Treatment Processes ◽  
Large Molecular Weight ◽  
Algae And Bacteria ◽  
Ultrafiltration Process

Advanced treatment of drinking water was performed by ultrafiltration process (UF) in this study. Experimental results showed that UF is a perfect physical sieving barrier to remove turbidity, algae and bacteria from water, which is far superior to conventional water treatment processes. But the ultrafiltration membrane is not very effective for the removal of dissolved organic matter because of the large molecular weight cut-off. And the backwashing per 30min can totally renew the ultrafiltration membrane.

Enhanced rapid gravity filtration and dissolved air flotation for pre-treatment of river thames reservoir water

1998 ◽  
Vol 37 (2) ◽  
pp. 35-42 ◽  
Author(s):  
M. J. Bauer ◽  
R. Bayley ◽  
M. J. Chipps ◽  
A. Eades ◽  
R. J. Scriven ◽  
...  
Keyword(s):  
Water Treatment ◽  
Water Supply ◽  
21St Century ◽  
Reservoir Water ◽  
Dissolved Air Flotation ◽  
Lowland Rivers ◽  
Air Flotation ◽  
Pre Treatment ◽  
Counter Current ◽  
Dissolved Air

Thames Water treats approximately 2800Ml/d of water originating mainly from the lowland rivers Thames and Lee for supply to over 7.3million customers, principally in the cities of London and Oxford. This paper reviews aspects of Thames Water's research, design and operating experiences of treating algal rich reservoir stored lowland water. Areas covered include experiences of optimising reservoir management, uprating and upgrading of rapid gravity filtration (RGF), standard co-current dissolved air flotation (DAF) and counter-current dissolved air flotation/filtration (COCO-DAFF®) to counter operational problems caused by seasonal blooms of filter blocking algae such as Melosira spp., Aphanizomenon spp. and Anabaena spp. A major programme of uprating and modernisation (inclusion of Advanced Water Treatment: GAC and ozone) of the major works is in progress which, together with the Thames Tunnel Ring Main, will meet London's water supply needs into the 21st Century.

Dissolved air flotation in drinking water production

2001 ◽  
Vol 43 (8) ◽  
pp. 9-18 ◽  
Author(s):  
T. Schofield
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Potable Water ◽  
Water Production ◽  
Process Technology ◽  
Dissolved Air Flotation ◽  
Drinking Water Production ◽  
Air Flotation ◽  
Potable Water Treatment ◽  
Dissolved Air

Dissolved Air Flotation (DAF) has become increasingly important in the field of potable water treatment, as a preferred option for treating upland and stored lowland waters. This paper outlines the development of dissolved air flotation (DAF) in potable water treatment, the benefits and disadvantages and the recent advances that has taken the process technology from an art to a science.

HIGH-pH Coagulation-Adsorption: A New Technology for Water Treatment and Reuse

1989 ◽  
Vol 21 (6-7) ◽  
pp. 511-517 ◽  
Author(s):  
A. M. Dziubek ◽  
A. L. Kowal
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Water Treatment ◽  
Treatment Process ◽  
New Technology ◽  
Treatment Technology ◽  
High Ph ◽  
Optimum Ph ◽  
Turbidity Level ◽  
Partial Inactivation

A novel high-pH water treatment technology with processed dolomite as coagulant is proposed. The technology has been developed on the basis of laboratory-scale experiments with model solutions and a variety of natural water samples. Treatment effects are assessed in terms of colour, turbidity, TOC and COD removal. The technology is successful when applied to the treatment of surface water, irrespective of the influent concentration of pollutants. The effluent is clear and colourless, displaying a high removal of organic matter and heavy metals, as well as a partial inactivation of viruses and bacteria. Following a single-stage recarbonation process, water treated via this technology exerts no corrosive action. The optimum dolomite coagulant dose depends exclusively on the influent alkalinity, provided that turbidity level and colour concentration are moderately high. The optimum pH for the treatment process approaches 10.5. The technology proposed is an advantageous combination of three unit processes: decarbonation, coagulation and adsorption.

Comprehensive assessment of precursors, diagenesis, and reactivity to water treatment of dissolved and colloidal organic matter

2004 ◽  
Vol 4 (4) ◽  
pp. 1-9 ◽  
Author(s):  
J.A. Leenheer
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Condensed Tannins ◽  
Drinking Water Treatment ◽  
Amino Sugar ◽  
Amino Sugars ◽  
Research Approach ◽  
Soil Aquifer Treatment ◽  
Treatment Processes ◽  
High Yields

A comprehensive isolation, fractionation, and characterization research approach was developed for dissolved and colloidal organic matter (DOM) in water, and it was applied to various surface- and groundwaters to assess DOM precursors, DOM diagenesis, and DOM reactivity to water treatment processes. Major precursors for natural DOM are amino sugars, condensed tannins, and terpenoids. Amino sugar colloids derived from bacterial cell walls are incompletely removed by drinking water treatment and foul reverse osmosis membranes, but are nearly quantitatively removed by soil/aquifer treatment. When chlorinated, amino sugars produce low yields of regulated disinfection by-products (DBPs) but they produce significant chlorine demand that is likely caused by chlorination of free amino groups. Condensed tannins are major precursors for ,blackwater- DOM such as that found in the Suwannee River. This DOM produces high yields of DBPs upon chorination, and is efficiently removed by coagulation/flocculation treatment. Terpenoid-derived DOM appears to be biologically refractory, infiltrates readily into groundwater with little removal by soil/aquifer treatment, gives low DBP-yields upon chlorination and is poorly removed by coagulation/flocculation treatments. Peptides derived from proteins are major components of the base DOM fraction (10% or less of the mass of DOM), and this fraction produces large yields of haloacetonitriles upon chorination.

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