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Biological Denitrification of Wastewaters by Addition of Organic Materials PERRY L. MC CARTY, Professor Department of Civil Engineering Stanford University Stanford, California LOUIS BECK, Chief Quality and Treatment Unit California Department of Water Resources Fresno, California PERCY ST. AMANT, Director San Joaquin Project Federal Water Pollution Control Administration Fresno, California INTRODUCTION Biological denitrification has been frequently suggested as a method for the removal of nitrate nitrogen from wastewaters when required for the control of eutrophication in receiving waters. Denitrification requires the availability of an electron donor and the organic matter present in municipal wastewaters was often felt to satisfy this need (1,2,3,4). However, the amount and nature of the organic matter naturally present is not readily controllable and this has led to a degree of unreliability for the process (5). In addition, many industrial and agricultural wastewaters do not have a suitable electron donor present. The addition of organic material under carefully controlled conditions to serve as an electron donor is one way to overcome these limitations. This study was instigated by the California Department of Water Resources to evaluate the effectiveness, required concentration, and cost of several possible organic materials for denitrification. This was one of the methods being explored for the removal of nitrate nitrogen from future agricultural wastewaters to be removed from approximately 1,700,000 acres of irrigated land in the San Joaquin Valley of California. This report summarizes the results of the feasibility study completed in 1966 (6). Subsequent field studies on the denitrification process conducted by the Interagency Agricultural Waste Water Treatment Center which is jointly operated by the California Department of Water Resources, the Federal Water Pollution Control Administration, and the Bureau of Reclamation, are reported elsewhere (7,8). BIOLOGICAL DENITRIFICATION Denitrification is a microbial process by which nitrate and nitrite are reduced to molecular nitrogen (9). Nitrous oxide is sometimes formed during denitrification, but this does not appear as a significant intermediate during denitrification in aqueous solutions (2). The molecular nitrogen end product is an inert gas which, unlike other compounds of nitrogen, is relatively unavailable for biological growth. Thus, denitrification converts nitrogen from objectionable forms to a non- objectionable one. Denitrification is a respiratory mechanism in which nitrate -1271 -
Object Description
Purdue Identification Number | ETRIWC1969089 |
Title | Biological denitrification of wastewaters by addition of organic materials |
Author |
McCarty, Perry L. Beck, Louis St. Amant, Percy |
Date of Original | 1969 |
Conference Title | Proceedings of the 24th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,16392 |
Extent of Original | p. 1271-1285 |
Series | Engineering extension series no. 135 |
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 | 2009-05-21 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 1271 |
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 | Biological Denitrification of Wastewaters by Addition of Organic Materials PERRY L. MC CARTY, Professor Department of Civil Engineering Stanford University Stanford, California LOUIS BECK, Chief Quality and Treatment Unit California Department of Water Resources Fresno, California PERCY ST. AMANT, Director San Joaquin Project Federal Water Pollution Control Administration Fresno, California INTRODUCTION Biological denitrification has been frequently suggested as a method for the removal of nitrate nitrogen from wastewaters when required for the control of eutrophication in receiving waters. Denitrification requires the availability of an electron donor and the organic matter present in municipal wastewaters was often felt to satisfy this need (1,2,3,4). However, the amount and nature of the organic matter naturally present is not readily controllable and this has led to a degree of unreliability for the process (5). In addition, many industrial and agricultural wastewaters do not have a suitable electron donor present. The addition of organic material under carefully controlled conditions to serve as an electron donor is one way to overcome these limitations. This study was instigated by the California Department of Water Resources to evaluate the effectiveness, required concentration, and cost of several possible organic materials for denitrification. This was one of the methods being explored for the removal of nitrate nitrogen from future agricultural wastewaters to be removed from approximately 1,700,000 acres of irrigated land in the San Joaquin Valley of California. This report summarizes the results of the feasibility study completed in 1966 (6). Subsequent field studies on the denitrification process conducted by the Interagency Agricultural Waste Water Treatment Center which is jointly operated by the California Department of Water Resources, the Federal Water Pollution Control Administration, and the Bureau of Reclamation, are reported elsewhere (7,8). BIOLOGICAL DENITRIFICATION Denitrification is a microbial process by which nitrate and nitrite are reduced to molecular nitrogen (9). Nitrous oxide is sometimes formed during denitrification, but this does not appear as a significant intermediate during denitrification in aqueous solutions (2). The molecular nitrogen end product is an inert gas which, unlike other compounds of nitrogen, is relatively unavailable for biological growth. Thus, denitrification converts nitrogen from objectionable forms to a non- objectionable one. Denitrification is a respiratory mechanism in which nitrate -1271 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
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