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RECOVERY AND APPLICATION OF SOLIDS FROM CRAB-PROCESSING WASTEWATER Allen C. Chao, Associate Professor Leon Tzou, Graduate Assistant Clyde T. Young, Professor Department of Civil Engineering North Carolina State University Raleigh, North Carolina 27650 INTRODUCTION The seafood industry has been estimated to consume more than 2.5 billion gallons of water annually in processing the harvest into marketable products [1]. Most of the consumed water is discharged as processing wastewaters which, in the past, received little treatment prior to their release into receiving bodies. However, with the advent of more stringent effluent limitations being imposed on industrial discharges, the seafood industry has planned three basic strategies to achieve the required treatment levels of their effluent without imposing too much financial burden on the industry. These strategies are: (1) minimize the use of processing water; (2) recovery of the solid portions from the waste discharge; and (3) recovery of the dissolved portions from the waste discharge. To minimize the water usage, a research project has been undertaken by Carawan et al. [2] to investigate methods that can be used by the food industry to reduce the water usage. The seafood industry is one of the many food industries that can achieve savings of processing water by changing or modifying the existing processing techniques and equipment. If the recommendations are followed, the water usage and hence the resulting wastewater discharge can be reduced to its minimum quantity. However, the need to provide adequate treatment of the wastewater discharge is not eliminated. To recover the solid portions of substances from the wastewater discharge, the seafood industry is currently employed screening and/or dissolved air flotation to remove coarse and some fine particles [3]. But after the treatment, the effluents will still not meet proposed future standards [3,4]. Thus, it leads to the conclusion that the soluble organic substances must be removed, or the seafood processing wastewaters will not meet future effluent limitations. Biological systems such as extended aeration and lagoons are generally mentioned and recommended as additional treatment for removing soluble organic substances from seafood wastewaters [5,6]. Since most seafood processing plants are small scale and scattered along coastal areas where land is expensive the space limited, the biological method may not be the most suitable and cost- effective system for treating seafood processing wastewaters. Further, most seafood industrial operations are dependent on the types of catch and are not operated continuously on a 12-month basis; it is, therefore, difficult to maintain a trouble-free operation of a biological treatment system for treating seafood wastewaters [6]. Unlike municipal and some industrial wastewaters, the pollutants in most seafood processing wastewater are nutritious organic material. Since the wastewaters do not contain heavy metals and other known toxicitants, the organic matter can be recovered from the wastewaters as usable byproducts. Use of a biological treatment system will simply convert these organic substances, at the cost of energy consumption, into low-grade sludge which does not have much economic value. Further conditioning and disposal of the resulting biological sludge require additional costs and/or land 829
Object Description
Purdue Identification Number | ETRIWC198382 |
Title | Recovery and application of solids from crab-processing wastewater |
Author |
Chao, Allen C. Tzou, Leon Young, Clyde T. |
Date of Original | 1983 |
Conference Title | Proceedings of the 38th Industrial Waste Conference |
Extent of Original | p. 829-838 |
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 | 2009-07-28 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 829 |
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 | RECOVERY AND APPLICATION OF SOLIDS FROM CRAB-PROCESSING WASTEWATER Allen C. Chao, Associate Professor Leon Tzou, Graduate Assistant Clyde T. Young, Professor Department of Civil Engineering North Carolina State University Raleigh, North Carolina 27650 INTRODUCTION The seafood industry has been estimated to consume more than 2.5 billion gallons of water annually in processing the harvest into marketable products [1]. Most of the consumed water is discharged as processing wastewaters which, in the past, received little treatment prior to their release into receiving bodies. However, with the advent of more stringent effluent limitations being imposed on industrial discharges, the seafood industry has planned three basic strategies to achieve the required treatment levels of their effluent without imposing too much financial burden on the industry. These strategies are: (1) minimize the use of processing water; (2) recovery of the solid portions from the waste discharge; and (3) recovery of the dissolved portions from the waste discharge. To minimize the water usage, a research project has been undertaken by Carawan et al. [2] to investigate methods that can be used by the food industry to reduce the water usage. The seafood industry is one of the many food industries that can achieve savings of processing water by changing or modifying the existing processing techniques and equipment. If the recommendations are followed, the water usage and hence the resulting wastewater discharge can be reduced to its minimum quantity. However, the need to provide adequate treatment of the wastewater discharge is not eliminated. To recover the solid portions of substances from the wastewater discharge, the seafood industry is currently employed screening and/or dissolved air flotation to remove coarse and some fine particles [3]. But after the treatment, the effluents will still not meet proposed future standards [3,4]. Thus, it leads to the conclusion that the soluble organic substances must be removed, or the seafood processing wastewaters will not meet future effluent limitations. Biological systems such as extended aeration and lagoons are generally mentioned and recommended as additional treatment for removing soluble organic substances from seafood wastewaters [5,6]. Since most seafood processing plants are small scale and scattered along coastal areas where land is expensive the space limited, the biological method may not be the most suitable and cost- effective system for treating seafood processing wastewaters. Further, most seafood industrial operations are dependent on the types of catch and are not operated continuously on a 12-month basis; it is, therefore, difficult to maintain a trouble-free operation of a biological treatment system for treating seafood wastewaters [6]. Unlike municipal and some industrial wastewaters, the pollutants in most seafood processing wastewater are nutritious organic material. Since the wastewaters do not contain heavy metals and other known toxicitants, the organic matter can be recovered from the wastewaters as usable byproducts. Use of a biological treatment system will simply convert these organic substances, at the cost of energy consumption, into low-grade sludge which does not have much economic value. Further conditioning and disposal of the resulting biological sludge require additional costs and/or land 829 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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