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.

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

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.

Biological Treatment of a High Salinity Chemical Industrial Wastewater

1993 ◽  
Vol 27 (7-8) ◽  
pp. 105-112 ◽  
Author(s):  
Shimshon Belkin ◽  
Asher Brenner ◽  
Aharon Abeliovich
Keyword(s):  
Activated Carbon ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Salt Concentration ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
High Salinity ◽  
Laboratory Bench ◽  
Wastewater Stream ◽  
Scale Reactor

Various laboratory-scale process configurations were tested for the biological treatment of a combined wastewater stream of several chemical factories. The untreated wastewaters, rich in halogenated organics (1250±389 mg/l DOC), were also highly saline (32±11 g/liter TDS 550°C) and toxic (Microtox™ EC50 = 1.5±2.0%). Biphasic (anaerobic/aerobic) laboratory bench-scale reactor systems yielded reduction of dissolved organic carbon by 70 to 84%, in the absence and presence of powdered activated carbon, respectively. The anaerobic phase proved to be essential in all systems, both for dissolved organic carbon removal and for detoxification. Similar efficiencies were obtained in either activated sludge or aerated lagoon type reactors, but in the latter case, longer hydraulic retention times were required. DOC removal was found to decrease with increased salt concentration; however, a 50% efficiency was achieved even at 90 g/l TDS. Toxicity elimination as judged by the Microtox™ assay was highly variable in the absence of activated carbon but stable and efficient in its presence.

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