Dissolved Organic Carbon Removal from a Prairie Water Supply Using Ozonation and Biological Activated Carbon

1999 ◽  
Vol 34 (4) ◽  
pp. 615-632 ◽  
Author(s):  
Joanne Sketchell ◽  
Hans G. Peterson ◽  
Nick Christofi
Keyword(s):  
Activated Carbon ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Water Source ◽  
Drinking Water Source ◽  
Biological Activated Carbon ◽  
Chlorine Demand ◽  
Biodegradable Dissolved Organic Carbon ◽  
Carbon Filtration ◽  
By Products

Abstract Large quantities of dissolved organic carbon in prairie surface water reservoirs make sustainable treatment quite challenging. Organic material is a precursor for the formation of disinfection by-products. Here, ozonation and biological activated carbon filtration were used as methods for removing dissolved organic carbon from the water of a small prairie reservoir used as a drinking water source. Biofiltration alone yielded significant reductions in dissolved organic carbon, colour, total trihalomethanes and chlorine demand. When ozonation preceded biofiltration, the increased proportion of biodegradable dissolved organic carbon allowed for significantly greater (p<0.05

Effets de l'ozonation et de la filtration biologique sur la demande en chlore et sur les précurseurs de trihalométhanes et des composés organo-halogénés totaux

1995 ◽  
Vol 22 (5) ◽  
pp. 945-954
Author(s):  
Hélène Baribeau ◽  
Michèle Prévost ◽  
Raymond Desjardins ◽  
Pierre Lafrance ◽  
Bernard Legube
Keyword(s):  
Activated Carbon ◽  
Organic Carbon ◽  
Biological Treatment ◽  
Residual Chlorine ◽  
Short Term ◽  
Biological Activated Carbon ◽  
Organic Halides ◽  
Chlorine Demand ◽  
Carbon Filtration ◽  
By Products

The effects of biological treatment (ozonation followed by biological activated carbon filtration (BAC)) on chlorine demand and on formation of trihalomethanes (THM) and total organic halides compounds (TOH) were studied at the Sainte-Rose water treatment facility, Laval. The plant influent is a surface water with a dissolved organic carbon of 6–7 mg/L. Results showed that ozonation marginally reduced (0–6%) short term chlorine demand but that BAC filtration reduced it by 40–55%. Ozonation versus BAC filtration was found to effect THM and TOH formation differently from the removal of the chlorine demand. THM (4-h contact with chlorine) and TOH formations were reduced by 48–60% and 39%, respectively, via ozonation. With BAC filtration, THM and TOH formations were reduced by 20–34% and 16%, respectively, with respect to the ozonated influent. For all essays, an initial significant decrease in residual chlorine was followed by an increase in TOH and subsequently in THM. The initial chlorine doses used for measuring the chlorine demand were found to have an effect on the final results. An increase in the initial chlorine dose resulted in a higher chlorine demand as well as in higher THM and TOH formations. The effect was found to be more profound at chlorine doses less than 3 mg Cl2/mg total organic carbon. Key words: chlorine demand, chlorination by-products, trihalomethane, total organic halides, ozonation, filtration, biological activated carbon.

Competitive removal of dissolved organic carbon by adsorption and biodegradation on biological activated carbon

1997 ◽  
Vol 35 (7) ◽  
pp. 147-153 ◽  
Author(s):  
Woo Hang Kim ◽  
Wataru Nishijima ◽  
Eiji Shoto ◽  
Mitsumasa Okada
Keyword(s):  
Activated Carbon ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Service Time ◽  
Breakthrough Curve ◽  
Biological Activated Carbon ◽  
The Right

Improvement of biodegradability of dissolved organic carbon (DOC) by ozonation does not always induce improvement of DOC removal and extension of activated carbon service time, because most of biodegradable DOC increased by ozonation is adsorbable on activated carbon. The objective of this study is to clarify the fate of the biodegradable DOC increased by preozonation on biological activated carbon (BAC) and to evaluate effects of preozonation on BAC performance for the removal of DOC and extension of activated carbon service time. DOC breakthrough curve for BAC process obviously shifted to the right by combination with ozonation, indicating that preozonation extended BAC service time. Higher removal of DOC was noted in the ozone-BAC process than the BAC process after saturation with DOC. Ozonation increased biodegradable DOC by 2.89 mg·l−1 (31%). Although the increased biodegradable DOC had possibilities to be removed both by adsorption and biodegradation, most of it was removed by biodegradation on BAC which resulted in longer BAC service time. Biodegradation of the increased biodegradable DOC was responsible for the higher removal of DOC after saturation with DOC in the ozone-BAC process.

scholarly journals Application of pilot scale trickling filter couple with pre-ozonation for ammonia, iron and dissolved organic carbon removals from Saigon river water

2017 ◽  
Vol 1 (M2) ◽  
pp. 57-65
Author(s):  
Ngan Ngoc Kim Le ◽  
Dan Phuoc Nguyen
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Pilot Scale ◽  
Raw Water ◽  
Trickling Filter ◽  
Hydraulic Loading ◽  
Pump Station ◽  
Chlorine Demand ◽  
Scale Experiment ◽  
By Products

A pilot scale trickling filter and pre-ozonation contactor with capacity of about 20 m3/day was run at Hoa Phu Pump Station which takes raw water from Saigon River for drinking water supply for Ho Chi Minh City. The raw water contains 0.52 ± 0.19 mg NH4+-N/l, 0.14 ± 0,06 mg/l total iron and 3.14 ± 0.45 mg/l DOC. The study aimed to using the pilot scale experiment to assess ammonia, iron and dissolved organic carbon (DOC) removals from Saigon Water River for the sake of reducing chlorine demand and thus mitigating risk from Disinfection By Products (DBPs) formation. The size of the trickling filter was 0.5 m long x 0.5 wide x 2m high. The bio-media was seven PE wool sheets with thickness of 30 mm that is widely used as filter cloth in aquariums. It run at hydraulic loading of 3 m3/m2.h of raw water, and 8 m3/m2.h, where 50% of total flow was the returned effluent of pre-ozonation. The pilot scale pre-ozonation contactor which has the size of 0.6 m long x 0.6 m wide x 2.0 m high was operated at contact time of 15 minutes and ozone concentration of 0.5 mg/l. The ammonia, iron and DOC removals at 8 m3/m2.h were 58%, 25% and 22%, respectively. Whereas, it obtained ammonia, iron and DOC removals of 52%, 19% and 9% DOC respectively. Thus, even though the experiment with returned pre-ozonation effluent run at high hydraulic loading rate, the better performance was obtained as comparison to the experiment without return.

Biodegradability of Danube bank filtrate and its enhancement by ozonation

2007 ◽  
Vol 7 (3) ◽  
pp. 139-144
Author(s):  
V.Z. Cukic ◽  
V.L. Knezic
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Distribution Networks ◽  
Organic Content ◽  
Low Risk ◽  
Danube River ◽  
Source Water ◽  
Transformation Processes ◽  
By Products

The reduction of organic content through transformation processes in the Danube aquifer along a studied area, biodegradability of Danube bank filtrate and its enhancement by ozonation have all been examined in a study carried out in order to assess amenability of Danube bank filtrate for bio-filtration. As determined during the study period Dissolved Organic Carbon (DOC) varied from 4.6–6.5 mgC/L and from 2.8–3.7 mgC/L in Danube River and Danube bank filtrate respectively. As determined 11.2% of Danube bank filtrate DOC was bio-degradable. A substantial enhancement of biodegradability has been observed after the application of Ozone dosages ranging from 0.45 to 0.9 mgO3/ mgC. It was concluded that Danube bank filtrate itself is not amenable for bio-filtration but an enhancement of its bio-degradability by ozonation could make bio-filtration a reasonable and economical option for reducing of DOC content to the levels that provide low risk of excessive disinfection by-products formation and prevent bacterial re-growth in distribution networks of cities using Danube bank filtrate as the source water.

New Biology for Advanced Wastewater Treatment

1999 ◽  
Vol 40 (4-5) ◽  
pp. 137-144 ◽  
Author(s):  
K. Miserez ◽  
S. Philips ◽  
W. Verstraete
Keyword(s):  
Wastewater Treatment ◽  
Activated Carbon ◽  
Organic Carbon ◽  
Genetically Modified Organisms ◽  
New Technologies ◽  
Chemical Oxidation ◽  
Advanced Treatment ◽  
Biological Activated Carbon ◽  
Catabolic Potential ◽  
New Biology

A number of new technologies for the advanced treatment of wastewater have recently been developed. The oxidative cometabolic transformation by methanotrophs and by nitrifiers represent new approaches in relation to organic carbon. The Biological Activated Carbon Oxidative Filters characterized by thin biofilms are also promising in that respect. Moreover, implementing genetically modified organisms with improved catabolic potential in advanced water treatment comes into perspective. For very refractory effluents chemical support techniques, like e.g. strong chemical oxidation, can be lined up with advanced biology.

Removal of trihalomethanes from high organic matter water sources using aeration: a feasibility study

2020 ◽  
Vol 55 (2) ◽  
pp. 184-197
Author(s):  
Saeideh Mirzaei ◽  
Beata Gorczyca
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Feasibility Study ◽  
Distribution Systems ◽  
Water Age ◽  
Treated Water ◽  
Canadian Guideline ◽  
Viable Solution ◽  
By Products

Abstract In this study, diffused aeration was applied to remove trihalomethane (THM) compounds from chlorinated, treated water containing high dissolved organic carbon (DOC) of 6.8 ± 1.2 mg/L. Increasing air-to-water volumetric ratio (rA/W) from 16 to 39 enhanced total THM (TTHM) removal from 60 to 70% at 20 °C and from 30 to 50% at 4 °C. Although bromodichloromethane has lower Henry's law constant than chloroform (CF), it was removed by a higher degree than CF in some aeration trials. Albeit obtaining high removals in aeration, TTHM reformed, and their concentration surpassed the Canadian guideline of 100 ppb in about 24 hours at 20 °C and 40 hours at 10 °C in all attempted air-to-water ratios. The water age in the system investigated in this study varied from 48 hours in midpoint chlorine boosting stations to 336 hours in the nearest endpoint. This study showed that THM removal by aeration is not a viable solution to control the concentration of these disinfection by-products in high-DOC treated water and in distribution systems where water age exceeds 24 hours; unless, it is going to be installed at the distribution endpoints.

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