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DESIGN AND OPERATION OF WET CORN MILLING PRETREATMENT FACILITIES L. M. Lace, Environmental Engineer C. H. Huether, Environmental Engineering Manager Daniel International Greenville, South Carolina 29602 M. Tepoorten, Plant Chemist The Canada Starch Company Inc. Port Colborne, Ontario Canada L3K 5X7 H. H. Trayner, Energy Environmental Superintendent The Canada Starch Company, Ltd. Cardinal, Ontario Canada KOE 1EO INTRODUCTION Wet Corn Milling wastes are readily biodegradable in biological treatment systems; however, effluent limitations are difficult to attain due to high effluent suspended solids concentrations [1-3]. Additional complications are due to large fluctuations in influent BOD concentration due to variability of raw materials and production schedule [1,3]. The major characteristics of wet corn milling wastewaters are poor settling characteristics and excessive filamentous organisms in the sludge [2-5]. Pilot plant and lab scale operations have shown excellent results not substantiated by full scale operations [4,5], although Bensing and Brown [2] achieved satisfactory sludge separation in a lagoon system settling pond which is well suited to cold weather operation [6]. CASE HISTORY Five months prior to process plant start-up of the Canada Starch Co. Inc. (CASCO), Port Colborne, Ontario, Wet Corn Milling plant, Canada Starch was notified by the Municipal Authorities that the municipal wastewater treatment plant was unable to treat the plant wastewater as originally permitted. Pre-treatment requirements limiting discharge to 500 mg/I BOD and SS were imposed. In addition there was substantial concern by the authorities that the impact of the high carbohydrate wastewater on the municipal plant would cause an unacceptable decrease in effluent quality due to the increased presence of filamentous organisms characteristic of the sludge. Pretreatment Requirements Expected wastewater quality and quantity were estimated on the basis of prior owner experience at other wet corn milling plants. Plant wastewater was expected to be composed of sanitary, utility, and process waste streams. Process wastewater originates from anion and cation exchanger backwashes, softener backwashes, steepwater condensate and plant cleaning. Discharge limitations were determined by the regional authorities to be 500 mg/I BOD and SS. Expected plant raw wastewater characteristics were as shown: Flowrate 507,000 gpd (1999 m'/d) BOD 1,015 mg/1 SS 95 mg/I 287
Object Description
Purdue Identification Number | ETRIWC198529 |
Title | Design and operation of wet corn milling pretreatment facilities |
Author |
Lace, L. M. (Libby Morris) Huether, C. H. Tepoorten, M. Trayner, H. H. |
Date of Original | 1985 |
Conference Title | Proceedings of the 40th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,36131 |
Extent of Original | p. 287-296 |
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 | 2009-07-15 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 287 |
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 | DESIGN AND OPERATION OF WET CORN MILLING PRETREATMENT FACILITIES L. M. Lace, Environmental Engineer C. H. Huether, Environmental Engineering Manager Daniel International Greenville, South Carolina 29602 M. Tepoorten, Plant Chemist The Canada Starch Company Inc. Port Colborne, Ontario Canada L3K 5X7 H. H. Trayner, Energy Environmental Superintendent The Canada Starch Company, Ltd. Cardinal, Ontario Canada KOE 1EO INTRODUCTION Wet Corn Milling wastes are readily biodegradable in biological treatment systems; however, effluent limitations are difficult to attain due to high effluent suspended solids concentrations [1-3]. Additional complications are due to large fluctuations in influent BOD concentration due to variability of raw materials and production schedule [1,3]. The major characteristics of wet corn milling wastewaters are poor settling characteristics and excessive filamentous organisms in the sludge [2-5]. Pilot plant and lab scale operations have shown excellent results not substantiated by full scale operations [4,5], although Bensing and Brown [2] achieved satisfactory sludge separation in a lagoon system settling pond which is well suited to cold weather operation [6]. CASE HISTORY Five months prior to process plant start-up of the Canada Starch Co. Inc. (CASCO), Port Colborne, Ontario, Wet Corn Milling plant, Canada Starch was notified by the Municipal Authorities that the municipal wastewater treatment plant was unable to treat the plant wastewater as originally permitted. Pre-treatment requirements limiting discharge to 500 mg/I BOD and SS were imposed. In addition there was substantial concern by the authorities that the impact of the high carbohydrate wastewater on the municipal plant would cause an unacceptable decrease in effluent quality due to the increased presence of filamentous organisms characteristic of the sludge. Pretreatment Requirements Expected wastewater quality and quantity were estimated on the basis of prior owner experience at other wet corn milling plants. Plant wastewater was expected to be composed of sanitary, utility, and process waste streams. Process wastewater originates from anion and cation exchanger backwashes, softener backwashes, steepwater condensate and plant cleaning. Discharge limitations were determined by the regional authorities to be 500 mg/I BOD and SS. Expected plant raw wastewater characteristics were as shown: Flowrate 507,000 gpd (1999 m'/d) BOD 1,015 mg/1 SS 95 mg/I 287 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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