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The Anaerobic Filter for Waste Treatment JAMES C. YOUNG, Graduate Student PERRY L. McCARTY, Associate Professor Civil Engineering Department Stanford University Stanford, California INTRODUCTION An entirely new anaerobic treatment process has been found to be particularly effective for the treatment of low strength soluble organic wastes. This process, termed the "anaerobic filter," is basically a rock-filled bed similar in appearance to an aerobic trickling filter. However, the waste is distributed across the bottom of the anaerobic filter. Flow is upward through the bed of rocks so that the filter is completely submerged. Anaerobic microorganisms accumulate in the void spaces between the rocks so that the waste comes in contact with a large active biological mass as it passes through the filter. A high degree of treatment results even at nominal waste temperatures, and the effluent is essentially free of biological solids. Historically, anaerobic systems have been used to stabilize high strength wastes, primarily composed of the solid; produced by aerobic processes and removed from settling tanks. Conventional anaerobic processes have required long detention times for good waste stabilization and have usually been uneconomical for the treatment of waste containing less than about one per cent biologically degradable organic material. "Anaerobic activated sludge" and other similar anaerobic contact processes can also efficiently treat low strength wastes. However, settling and recycle of the effluent solids is required to maintain a sufficiently high biological mass for efficient treatment. For wastes which are primarily soluble a significant fraction of the microbial mass may remain dispersed; the biological solids are difficult to settle and recycle, and high treatment efficiencies are difficult to maintain. In comparing the anaerobic filter to these existing biological treatment processes a number of distinct advantages stand out: 1) The anaerobic filter is ideally suited for the treatment of soluble wastes. 2) No effluent or solids recycle is required with the anaerobic filter. The biological solids remain in the filter and are not lost with the effluent. 3) The accumulation of high concentrations of active solids in the filter permits the treatment of dilute wastes even at nominal temperatures. Heating is not required as in most other anaerobic processes to maintain a high treatment efficiency. 4) Very low volumes of sludge are produced by the anaerobic filter. The effluent is essentially free of suspended solids, and sludge wasting, in some 559 -
Object Description
Purdue Identification Number | ETRIWC196750 |
Title | Anaerobic filter for waste treatment |
Author |
Young, James C. McCarty, Perry L. |
Date of Original | 1967 |
Conference Title | Proceedings of the 22nd Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,14179 |
Extent of Original | p. 559-574 |
Series |
Engineering extension series no. 129 Engineering bulletin v. 52, no. 3 |
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 | 2009-05-20 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 559 |
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 | The Anaerobic Filter for Waste Treatment JAMES C. YOUNG, Graduate Student PERRY L. McCARTY, Associate Professor Civil Engineering Department Stanford University Stanford, California INTRODUCTION An entirely new anaerobic treatment process has been found to be particularly effective for the treatment of low strength soluble organic wastes. This process, termed the "anaerobic filter," is basically a rock-filled bed similar in appearance to an aerobic trickling filter. However, the waste is distributed across the bottom of the anaerobic filter. Flow is upward through the bed of rocks so that the filter is completely submerged. Anaerobic microorganisms accumulate in the void spaces between the rocks so that the waste comes in contact with a large active biological mass as it passes through the filter. A high degree of treatment results even at nominal waste temperatures, and the effluent is essentially free of biological solids. Historically, anaerobic systems have been used to stabilize high strength wastes, primarily composed of the solid; produced by aerobic processes and removed from settling tanks. Conventional anaerobic processes have required long detention times for good waste stabilization and have usually been uneconomical for the treatment of waste containing less than about one per cent biologically degradable organic material. "Anaerobic activated sludge" and other similar anaerobic contact processes can also efficiently treat low strength wastes. However, settling and recycle of the effluent solids is required to maintain a sufficiently high biological mass for efficient treatment. For wastes which are primarily soluble a significant fraction of the microbial mass may remain dispersed; the biological solids are difficult to settle and recycle, and high treatment efficiencies are difficult to maintain. In comparing the anaerobic filter to these existing biological treatment processes a number of distinct advantages stand out: 1) The anaerobic filter is ideally suited for the treatment of soluble wastes. 2) No effluent or solids recycle is required with the anaerobic filter. The biological solids remain in the filter and are not lost with the effluent. 3) The accumulation of high concentrations of active solids in the filter permits the treatment of dilute wastes even at nominal temperatures. Heating is not required as in most other anaerobic processes to maintain a high treatment efficiency. 4) Very low volumes of sludge are produced by the anaerobic filter. The effluent is essentially free of suspended solids, and sludge wasting, in some 559 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
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