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Developments to Upgrade Settlement Tank Performance, Screening, and Sludge Dewatering Associated with Industrial Wastewater Treatment JOHN B. CROCKFORD, SR., Engineer Crockford Company Spencerville, Ohio VAUGHN SPARHAM, Development Engineer N. Greening, Ltd. Warrington, England INTRODUCTION Consideration is given in this paper to various techniques used in Europe and being introduced in the United States dealing with: 1) Polishing clarification equipment; 2) Static continuous solids/ liquids separation equipment; 3) Combination of (1) and (2); and 4) Static sludge dewatering equipment. Reference is made to other equipment and processes and some operating theory is presented. POLISHING CLARIFICATION Treatment to a superior level may require different supplementary biological oxidation or effluent polishing technique and genuine effluent polishing can only be effectively carried out when the effluent quality approaches 30 mg/1 suspended solids. To polish treated industrial effluent, an unusual type of upward flow clarifier containing a wedgewater decking and, on occasion, a plastic matrix can be incorporated in a final settlement tank. Effluents with no more than 5 mg/1 suspended solids at 7 - 10 mg/1 BOD can be attained without recourse to filtration. Figure I - Simple Eddyflow polishing clarifier. In this type of clarifier, the wedgewater deck is suspended horizontally between 9" and 18" below the type water level, according to conditions of operation (See Figure 1). Treated water in a sedimentation tank thus fitted must first pass upwards through the wedgewater clement (and, for certain requirements, a plastic matrix), (See Figure 2), before it flows to the outlet weir in the normal way. As in the comparatively well known "Banks" upward flow pebble bed clarifier, suspended particles are flocculated by this "Eddyflow" device and come to rest on the surface of the stabilizing media (the wedgewater). Fine particles come to rest on the downstream, but upward facing side, of the wedgewater and appear to form a fragile fluidized blanket. On small installations, after some days of operation this blanket needs to be removed by temporarily arresting the flow to the tank and dropping the top water level to just below the wedgewater deck. The blanket is thus flushed back through the deck. On larger installations a blanket removal device that does not require interruption of flow may be used. 1072
Object Description
Purdue Identification Number | ETRIWC197291 |
Title | Developments to upgrade settlement tank performance, screening, and sludge dewatering associated with industrial wastewater treatment treatment |
Author |
Crockford, John B. Sparham, Vaughn |
Date of Original | 1972 |
Conference Title | Proceedings of the 27th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,20246 |
Extent of Original | p. 1072-1083 |
Series | Engineering extension series no. 141 |
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 | 2009-06-08 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page1072 |
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 | Developments to Upgrade Settlement Tank Performance, Screening, and Sludge Dewatering Associated with Industrial Wastewater Treatment JOHN B. CROCKFORD, SR., Engineer Crockford Company Spencerville, Ohio VAUGHN SPARHAM, Development Engineer N. Greening, Ltd. Warrington, England INTRODUCTION Consideration is given in this paper to various techniques used in Europe and being introduced in the United States dealing with: 1) Polishing clarification equipment; 2) Static continuous solids/ liquids separation equipment; 3) Combination of (1) and (2); and 4) Static sludge dewatering equipment. Reference is made to other equipment and processes and some operating theory is presented. POLISHING CLARIFICATION Treatment to a superior level may require different supplementary biological oxidation or effluent polishing technique and genuine effluent polishing can only be effectively carried out when the effluent quality approaches 30 mg/1 suspended solids. To polish treated industrial effluent, an unusual type of upward flow clarifier containing a wedgewater decking and, on occasion, a plastic matrix can be incorporated in a final settlement tank. Effluents with no more than 5 mg/1 suspended solids at 7 - 10 mg/1 BOD can be attained without recourse to filtration. Figure I - Simple Eddyflow polishing clarifier. In this type of clarifier, the wedgewater deck is suspended horizontally between 9" and 18" below the type water level, according to conditions of operation (See Figure 1). Treated water in a sedimentation tank thus fitted must first pass upwards through the wedgewater clement (and, for certain requirements, a plastic matrix), (See Figure 2), before it flows to the outlet weir in the normal way. As in the comparatively well known "Banks" upward flow pebble bed clarifier, suspended particles are flocculated by this "Eddyflow" device and come to rest on the surface of the stabilizing media (the wedgewater). Fine particles come to rest on the downstream, but upward facing side, of the wedgewater and appear to form a fragile fluidized blanket. On small installations, after some days of operation this blanket needs to be removed by temporarily arresting the flow to the tank and dropping the top water level to just below the wedgewater deck. The blanket is thus flushed back through the deck. On larger installations a blanket removal device that does not require interruption of flow may be used. 1072 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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