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ANAEROBIC TREATMENT KEY TO POLLUTION CONTROL AND SOLIDS DISPOSAL WITH ENERGY RECOVERY FOR A FOOD PROCESSOR Robert C. Landine, Senior Environmental Engineer Albert A. Cocci, Environmental Engineer T. Viraraghavan, Environmental Engineer Graham J. Brown, Environmental Engineer ADI Limited, Consulting Engineers Fredericton, New Brunswick, Canada A large potato processing plant was faced with the requirement of installing secondary treatment. The company was also have difficulties in disposing of a large quantity of filter cake, other potato waste solids and manure from its feedlot where cattle were being fed screenings and some other potato wastes. The authors' experience in anaerobic treatment opened the door to a novel approach to the overall problem. Previous studies had already shown that a system employing anaerobic treatment of process wastewater effluent after receiving only 10 mesh screening would be best. In that case, major solid waste streams such as peel waste and wastes from by-product processing lines were to be segregated for recovery in-plant and disposed separately. The novel approach presented in this chapter entailed discharge of all solid waste streams into the process sewer and subjecting the resulting wastewater to 10 mesh screening prior to anaerobic treatment in a bulk volume fermenter (BVF). The key to the proposed solution was the BVF, which is capable of treating a wastewater bearing a large concentration of suspended solids (SS) and producing biogas while operating at 20-25°C. Compared to the large quantity of primary filter cake and other solid wastes now produced, it was estimated that only a small percentage of these solids, on a dry weight basis, will remain for disposal after anaerobic digestion. It would become a stable sludge for disposal on agricultural land. Waste aerobic biological sludge, removed in the final clarifier, will be returned to the BVF for digestion and additional production of biogas. The proposal entails continued trucking of screenings solids to the company's feedlot to form part of the feed ration for the cattle. Due to the favorable balance between the animals' intake and their manure output, the feed truck could carry manure supernatant (only) on its return trip for treatment in the BVF system. This liquid manure stream will no longer present a pollution threat to the nearby stream, but will enhance biogas generation and receive a high degree of treatment prior to discharge into a large river. The biogas will be recovered and supplied to the process boilers where it could displace approximately 20,000 liter/day of imported oil when operating under design loading conditions. Although this approach resulted in a very large load (80,000 kg/day) of chemical oxygen demand (COD), requiring secondary treatment, no difficulty was foreseen in meeting effluent limits, and it was found to be the most cost-effective scheme. Five or ten years ago, the approach would have been to segregate as much solids in a "dry" state as possible inside the plant, followed by screening and good primary treatment, complete with sludge dewatering. This approach would minimize the pollution load remaining for secondary treatment. Hence, the idea of discharging all the solids into the process sewer for anaerobic treatment represented a radical departure from traditional waste treatment practice. 47
Object Description
Purdue Identification Number | ETRIWC198206 |
Title | Anaerobic treatment key to pollution control and solids disposal with energy recovery for a food processor |
Author |
Landine, Robert C. Cocci, A. A. (Albert A.) Viraraghavan, T. Brown, G. J. (Graham J.) |
Date of Original | 1982 |
Conference Title | Proceedings of the 37th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,32749 |
Extent of Original | p. 47-50 |
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 | 2009-07-14 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 47 |
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 | ANAEROBIC TREATMENT KEY TO POLLUTION CONTROL AND SOLIDS DISPOSAL WITH ENERGY RECOVERY FOR A FOOD PROCESSOR Robert C. Landine, Senior Environmental Engineer Albert A. Cocci, Environmental Engineer T. Viraraghavan, Environmental Engineer Graham J. Brown, Environmental Engineer ADI Limited, Consulting Engineers Fredericton, New Brunswick, Canada A large potato processing plant was faced with the requirement of installing secondary treatment. The company was also have difficulties in disposing of a large quantity of filter cake, other potato waste solids and manure from its feedlot where cattle were being fed screenings and some other potato wastes. The authors' experience in anaerobic treatment opened the door to a novel approach to the overall problem. Previous studies had already shown that a system employing anaerobic treatment of process wastewater effluent after receiving only 10 mesh screening would be best. In that case, major solid waste streams such as peel waste and wastes from by-product processing lines were to be segregated for recovery in-plant and disposed separately. The novel approach presented in this chapter entailed discharge of all solid waste streams into the process sewer and subjecting the resulting wastewater to 10 mesh screening prior to anaerobic treatment in a bulk volume fermenter (BVF). The key to the proposed solution was the BVF, which is capable of treating a wastewater bearing a large concentration of suspended solids (SS) and producing biogas while operating at 20-25°C. Compared to the large quantity of primary filter cake and other solid wastes now produced, it was estimated that only a small percentage of these solids, on a dry weight basis, will remain for disposal after anaerobic digestion. It would become a stable sludge for disposal on agricultural land. Waste aerobic biological sludge, removed in the final clarifier, will be returned to the BVF for digestion and additional production of biogas. The proposal entails continued trucking of screenings solids to the company's feedlot to form part of the feed ration for the cattle. Due to the favorable balance between the animals' intake and their manure output, the feed truck could carry manure supernatant (only) on its return trip for treatment in the BVF system. This liquid manure stream will no longer present a pollution threat to the nearby stream, but will enhance biogas generation and receive a high degree of treatment prior to discharge into a large river. The biogas will be recovered and supplied to the process boilers where it could displace approximately 20,000 liter/day of imported oil when operating under design loading conditions. Although this approach resulted in a very large load (80,000 kg/day) of chemical oxygen demand (COD), requiring secondary treatment, no difficulty was foreseen in meeting effluent limits, and it was found to be the most cost-effective scheme. Five or ten years ago, the approach would have been to segregate as much solids in a "dry" state as possible inside the plant, followed by screening and good primary treatment, complete with sludge dewatering. This approach would minimize the pollution load remaining for secondary treatment. Hence, the idea of discharging all the solids into the process sewer for anaerobic treatment represented a radical departure from traditional waste treatment practice. 47 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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