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Nitrogen Transformation During the Activated Sludge Treatment of Alkaline Wastewater JERZY GANCZARCZYK, Visiting Professor Department of Civil Engineering University of Toronto Toronto, Canada INTRODUCTION For the effective long term activated sludge treatment of the organic wastewaters deficient in mineral nutrients, their nitrogen and phosphorus requirements have to be satisfied. The proper evaluation of these requirements was the subject of numerous studies (1,2,3) from which it can be generally concluded that these requirements differ for different wastewater and different degrees of their treatment. Moreover, they also depend on the hydraulic loadings of the aeration tanks and the mixing conditions of their contents because these factors influence the rate of utilization of nutrients in the system or the rate of washout. It is believed that the exogenous nitrogen supply, at some range of nitrogen to removable organic carbon ration, is relative to the protein fraction of the activated sludge, i.e., to the number of active bacteria in the system, and therefore influences to some extent the effect of treatment, the possibility of increasing the loadings, and stability of the process even at some flow and load variations. The activated sludge process performance in some nitrogen deficient systems was the subject of numerous laboratory studies (4,5,6,7,8,9). They showed that the wastewater organic carbon for some period of time can be removed effectively in the absence of exogenous nitrogen, and that this is connected with the increase of the carbohydrate and decrease of the protein fractions of the activated sludge mass. Such systems can be regenerated by the presence of nitrogen sources in exogenous or endogenous conditions. The subject of the study is full-scale activated sludge treatment of an unbleached Kraft pulp mill nutrient-deficient effluent (10). In this plant the nitrification is completely inhibited. Thus, the forms of the nitrogen in the system is ammonia nitrogen introduced as a nutrient and released as a product of activated sludge endogenous respiration, and the organic nitrogen of the cells substance. This system in the three successive periods of time was supplied with excess of nitrogen nutrients, no nitrogen nutrients were added, and then the supply of nitrogen was as in the first period. EXPERIMENTAL The activated sludge treatment plant performance studies concerned the treatment of an unbleached Kraft pulp mill effluent with small admixture of primary treated town sewage at the range of the conventional loadings and in the aeration tanks with limited longitudinal mixing (10). -331-
Object Description
Purdue Identification Number | ETRIWC197034 |
Title | Nitrogen transformation during the activated sludge treatment of alkaline wastewater |
Author | Ganczarczyk, Jerzy J., 1928- |
Date of Original | 1970 |
Conference Title | Proceedings of the 25th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,18196 |
Extent of Original | p. 331-341 |
Series | Engineering extension series no. 137 |
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 | 2009-06-09 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page331 |
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 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Nitrogen Transformation During the Activated Sludge Treatment of Alkaline Wastewater JERZY GANCZARCZYK, Visiting Professor Department of Civil Engineering University of Toronto Toronto, Canada INTRODUCTION For the effective long term activated sludge treatment of the organic wastewaters deficient in mineral nutrients, their nitrogen and phosphorus requirements have to be satisfied. The proper evaluation of these requirements was the subject of numerous studies (1,2,3) from which it can be generally concluded that these requirements differ for different wastewater and different degrees of their treatment. Moreover, they also depend on the hydraulic loadings of the aeration tanks and the mixing conditions of their contents because these factors influence the rate of utilization of nutrients in the system or the rate of washout. It is believed that the exogenous nitrogen supply, at some range of nitrogen to removable organic carbon ration, is relative to the protein fraction of the activated sludge, i.e., to the number of active bacteria in the system, and therefore influences to some extent the effect of treatment, the possibility of increasing the loadings, and stability of the process even at some flow and load variations. The activated sludge process performance in some nitrogen deficient systems was the subject of numerous laboratory studies (4,5,6,7,8,9). They showed that the wastewater organic carbon for some period of time can be removed effectively in the absence of exogenous nitrogen, and that this is connected with the increase of the carbohydrate and decrease of the protein fractions of the activated sludge mass. Such systems can be regenerated by the presence of nitrogen sources in exogenous or endogenous conditions. The subject of the study is full-scale activated sludge treatment of an unbleached Kraft pulp mill nutrient-deficient effluent (10). In this plant the nitrification is completely inhibited. Thus, the forms of the nitrogen in the system is ammonia nitrogen introduced as a nutrient and released as a product of activated sludge endogenous respiration, and the organic nitrogen of the cells substance. This system in the three successive periods of time was supplied with excess of nitrogen nutrients, no nitrogen nutrients were added, and then the supply of nitrogen was as in the first period. EXPERIMENTAL The activated sludge treatment plant performance studies concerned the treatment of an unbleached Kraft pulp mill effluent with small admixture of primary treated town sewage at the range of the conventional loadings and in the aeration tanks with limited longitudinal mixing (10). -331- |
Resolution | 300 ppi |
Color Depth | 8 bit |
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