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Plastic Trickling Filter — Activated Sludge Treatment of Paper Wastes ROBERT H. FOLLETT, Development Engineer National Council for Stream Improvement, Inc. Northeast Research Center Tufts University Medford, Massachusetts INTRODUCTION A research study investigating methods of biological treatment of paper wastes for a group of Ohio Paper Mills provided an ideal situation to study a combination trickling filter-activated sludge treatment system. Construction and operating cost of the pilot plant were financed by the Ohio Paper Mills Research Committee, consisting of nineteen pulp and paper manufacturers located in the state of Ohio. Operating and supervising personnel were provided by the National Council for Stream Improvement. PURPOSE The purpose of this project was to determine whether a combination of a roughing plastic media trickling filter and activated sludge process could provide a more satisfactory method of secondary biological treatment than either of the processes alone. The pilot plant was operated over a two-year period, treating settled effluent from a fine papermill, boardmill, and a papermill employing deinking, the effluent from the latter contained the discharge from both the pulp and papermills. DESCRIPTION OF PILOT PLANT UNITS The pilot plant units were those essentially inherent to the activated sludge and trickling filter processes. The filter section was 10 ft in depth containing six cu yds of PVC media providing approximately 90 per cent voids. The filter was built above the aeration tank so that it drained into it. The aeration tank had a capacity of 380 cu ft(2860 gals) and aeration was supplied by sparger type diffusers of sufficient capacity so that air supply would at no time be a limiting factor. Flow regulation was such that it could be operated reliably at from 10 to 60 gpm. Recycle pump capacity was at the same capacity as the feed pump. Throughout all the test work sufficient diammonium phosphate was fed to the system so that nutrients would not be a limiting factor in the oxidation process. Mixed liquor suspended solids were maintained in excess of 3000 mg/1 throughout the entire test period. The final settling tank had a capacity of 6750 gals. The tank was cleaned with a rake type collector mechanism. Evaluation of the pilot plant were conducted at mills having primary clarification thereby eliminating the need for presedimentation. RESULTS AND DISCUSSION Sludge Recirculation to Trickling Filter Figure 1 shows the results obtained from returning activated sludge to the - 120 -
Object Description
Purdue Identification Number | ETRIWC196511 |
Title | Plastic trickling filter : activated sludge treatment of paper wastes |
Author | Follett, Robert H. |
Date of Original | 1965 |
Conference Title | Proceedings of the twentieth Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,12162 |
Extent of Original | p. 120-125 |
Series |
Engineering extension series no. 118 Engineering bulletin v. 49, no. 4 |
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 | 2009-05-19 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 120 |
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 | Plastic Trickling Filter — Activated Sludge Treatment of Paper Wastes ROBERT H. FOLLETT, Development Engineer National Council for Stream Improvement, Inc. Northeast Research Center Tufts University Medford, Massachusetts INTRODUCTION A research study investigating methods of biological treatment of paper wastes for a group of Ohio Paper Mills provided an ideal situation to study a combination trickling filter-activated sludge treatment system. Construction and operating cost of the pilot plant were financed by the Ohio Paper Mills Research Committee, consisting of nineteen pulp and paper manufacturers located in the state of Ohio. Operating and supervising personnel were provided by the National Council for Stream Improvement. PURPOSE The purpose of this project was to determine whether a combination of a roughing plastic media trickling filter and activated sludge process could provide a more satisfactory method of secondary biological treatment than either of the processes alone. The pilot plant was operated over a two-year period, treating settled effluent from a fine papermill, boardmill, and a papermill employing deinking, the effluent from the latter contained the discharge from both the pulp and papermills. DESCRIPTION OF PILOT PLANT UNITS The pilot plant units were those essentially inherent to the activated sludge and trickling filter processes. The filter section was 10 ft in depth containing six cu yds of PVC media providing approximately 90 per cent voids. The filter was built above the aeration tank so that it drained into it. The aeration tank had a capacity of 380 cu ft(2860 gals) and aeration was supplied by sparger type diffusers of sufficient capacity so that air supply would at no time be a limiting factor. Flow regulation was such that it could be operated reliably at from 10 to 60 gpm. Recycle pump capacity was at the same capacity as the feed pump. Throughout all the test work sufficient diammonium phosphate was fed to the system so that nutrients would not be a limiting factor in the oxidation process. Mixed liquor suspended solids were maintained in excess of 3000 mg/1 throughout the entire test period. The final settling tank had a capacity of 6750 gals. The tank was cleaned with a rake type collector mechanism. Evaluation of the pilot plant were conducted at mills having primary clarification thereby eliminating the need for presedimentation. RESULTS AND DISCUSSION Sludge Recirculation to Trickling Filter Figure 1 shows the results obtained from returning activated sludge to the - 120 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
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