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EFFECT OF MEAN CELL RESIDENCE TIME AND OZONATION ON CARBON ADSORPTION Ronald E. Buys, Engineer II Lockwood, Andrews, and Newman, Inc. Houston, Texas 77056 Tom D. Reynolds, Professor Civil Engineering Department Civil Engineering Department Texas A&M University College Station, Texas 77840 INTRODUCTION Petrochemical wastes provide potential pollutants in the form of concentrated oxygen- demanding organic and inorganic materials, od and oil-like substances, volatile and non- volatde suspended materials, compounds of tastes and odors, floatables, polymeric products, and chemical agents that interfere with analytical techniques. Biological treatment of these wastes usually removes organic matter and other contaminants such as nitrogen and phosphorus. Their uptake, as nutrients essential to microbial growth, results in partial removal from the wastewater. Depending on the nature of the wastewater, conversion of organic compounds may be virtually complete. However, the residuals from this conversion often require further treatment. Two methods of tertiary treatment for removal of these are ozonation and activated carbon adsorption. The effect of biological solids retention time on the combined use of biological oxidation, ozone induced oxidation, and granular activated carbon adsorption were examined in this study. The petrochemical effluent used was obtained from the Bayport Regional Wastewater Treatment Plant in Bayport, Texas. This plant treats the wastewater from approximately 28 industrial manufacturing plants, mostly petrochemical and located in southeast Harris County. The process wastewaters are treated by equalization, biooxidation by activated sludge, clarification, chlorination and final polishing. LITERATURE REVIEW The Activated Sludge Process Biological treatment with activated sludge requires a controlled environment containing optimum amounts of food, oxygen and living organisms. Control is obtained by varying the contact period between microbial cells and the waste. This is done by design of hydraulic systems that recirculate some of the activated sludge and waste the rest. Recirculation of microbial cells can be measured as solids retention time (SRT), sludge age (SA), or mean cell residence time (MCRT), aU of which define the average length of time a microorganism stays in the system. Bacteria rather than fungi purify wastewater and with increased MCRT the microorganisms advance through a succession of species. A MCRT of 10 days or more is usually necessary for adequate nitrification by the bacterial genera Nitrosomonas and Nitrobacter. Low MCRT produce effluents with high COD values that can be reduced by operation of MCRT of up to 40 days. Higher MCRT allow nitrifiers to mass and degrade the more bioresistant materials in a wastewater. 29
Object Description
Purdue Identification Number | ETRIWC198103 |
Title | Effect of mean cell residence time and ozonation on carbon adsorption |
Author |
Buys, Ronald E. Reynolds, Tom D. |
Date of Original | 1981 |
Conference Title | Proceedings of the 36th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,32118 |
Extent of Original | p. 29-35 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-07-07 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 29 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | EFFECT OF MEAN CELL RESIDENCE TIME AND OZONATION ON CARBON ADSORPTION Ronald E. Buys, Engineer II Lockwood, Andrews, and Newman, Inc. Houston, Texas 77056 Tom D. Reynolds, Professor Civil Engineering Department Civil Engineering Department Texas A&M University College Station, Texas 77840 INTRODUCTION Petrochemical wastes provide potential pollutants in the form of concentrated oxygen- demanding organic and inorganic materials, od and oil-like substances, volatile and non- volatde suspended materials, compounds of tastes and odors, floatables, polymeric products, and chemical agents that interfere with analytical techniques. Biological treatment of these wastes usually removes organic matter and other contaminants such as nitrogen and phosphorus. Their uptake, as nutrients essential to microbial growth, results in partial removal from the wastewater. Depending on the nature of the wastewater, conversion of organic compounds may be virtually complete. However, the residuals from this conversion often require further treatment. Two methods of tertiary treatment for removal of these are ozonation and activated carbon adsorption. The effect of biological solids retention time on the combined use of biological oxidation, ozone induced oxidation, and granular activated carbon adsorption were examined in this study. The petrochemical effluent used was obtained from the Bayport Regional Wastewater Treatment Plant in Bayport, Texas. This plant treats the wastewater from approximately 28 industrial manufacturing plants, mostly petrochemical and located in southeast Harris County. The process wastewaters are treated by equalization, biooxidation by activated sludge, clarification, chlorination and final polishing. LITERATURE REVIEW The Activated Sludge Process Biological treatment with activated sludge requires a controlled environment containing optimum amounts of food, oxygen and living organisms. Control is obtained by varying the contact period between microbial cells and the waste. This is done by design of hydraulic systems that recirculate some of the activated sludge and waste the rest. Recirculation of microbial cells can be measured as solids retention time (SRT), sludge age (SA), or mean cell residence time (MCRT), aU of which define the average length of time a microorganism stays in the system. Bacteria rather than fungi purify wastewater and with increased MCRT the microorganisms advance through a succession of species. A MCRT of 10 days or more is usually necessary for adequate nitrification by the bacterial genera Nitrosomonas and Nitrobacter. Low MCRT produce effluents with high COD values that can be reduced by operation of MCRT of up to 40 days. Higher MCRT allow nitrifiers to mass and degrade the more bioresistant materials in a wastewater. 29 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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