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33 ANAEROBIC TREATMENT OF SWINE WASTE BY THE ANAEROBIC SEQUENCING BATCH REACTOR Ruihong Zhang, Assistant Professor Department of Biological and Agricultural Engineering University of California at Davis Davis, California, 95616 Yulin Yin, Graduate Assistant Shihwu Sung, Associate Scientist Richard R. Dague, Professor Department of Civil Engineering Iowa State University Ames, Iowa 50011-3232 INTRODUCTION Anaerobic treatment is a technology well suited to helping solve the serious environmental and social problems associated with animal wastes produced as by-products of animal enterprises. An anaerobic treatment system can be easily integrated into liquid waste handling systems which are commonly used on modern livestock farms.1 The benefits that anaerobic treatment of animal wastes can bring to livestock producers, such as energy generation and waste stabilization for odor control, have been well demonstrated by previous research.2"5 The remaining challenge is to develop cost-effective and easily adaptable anaerobic reactor systems for farm applications. Conventional anaerobic processes used for animal waste treatment are continuously stirred tank reactors (CSTR) and plug-flow reactors. These processes are suited for treating concentrated waste such as the animal waste collected by mechanical scrapers, but not economical for treating diluted liquid waste, such as the waste collected by flushing systems which are more popularly used for large and new farms. Efficient anaerobic reactors for treating dilute wastewaters must retain biomass solids in the reactor with a short hydraulic retention time (HRT). The Anaerobic Sequencing Batch Reactor (ASBR) has been under development at Iowa State University to meet this need6 and U.S. Patent No. 5,185,079 was issued for this technology. The unique feature of the ASBR is its ability to grow and retain biomass with a long solids retention time (SRT) through a natural selection process. It is simple to operate and requires low maintenance. The studies on the ASBR for swine waste treatment have been conducted since 1990. Dague and Pidaparti7 first tested the ASBR with swine waste at six volatile solids (VS) loading rates ranging from 1.0 to 6.8 g/L/day, one HRT (6 day), and two temperatures (25°C and 35°C). The ASBR proved to work satisfactorily. Schmit and Dague8 evaluated the ASBR at a lower temperature (20°C), three HRTs (6, 9, and 12 day), and different VS loading rates ranging from 0.9 to 5.0 g/L/day. Volatile solids reductions ranging from 40 to 60% were achieved. The study reported in this chapter was carried out to further evaluate the ASBR for treating swine waste at short HRTs (2, 3, and 6 day) at 25°C. WORKING PRINCIPLES OF THE ANAEROBIC SEQUENCING BATCH REACTOR The ASBR is a suspended growth reactor which operates in a cyclic batch mode with four distinct phases per cycle. The four phases are feed, react, settle, and decant, as shown in Figure 1. 51st Purdue Industrial Waste Conference Proceedings, 1996, Ann Arbor Press, Inc., Chelsea, Michigan 48118. Printed in U.S.A. 315
Object Description
Purdue Identification Number | ETRIWC199633 |
Title | Anaerobic treatment of swine waste by the anaerobic sequencing batch reactor |
Author |
Zhang, Ruihong Yin, Yulin Sung, Shihwu Dague, Richard R. |
Date of Original | 1996 |
Conference Title | Proceedings of the 51st Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,46351 |
Extent of Original | p. 315-322 |
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 | 2009-10-27 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 315 |
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 | 33 ANAEROBIC TREATMENT OF SWINE WASTE BY THE ANAEROBIC SEQUENCING BATCH REACTOR Ruihong Zhang, Assistant Professor Department of Biological and Agricultural Engineering University of California at Davis Davis, California, 95616 Yulin Yin, Graduate Assistant Shihwu Sung, Associate Scientist Richard R. Dague, Professor Department of Civil Engineering Iowa State University Ames, Iowa 50011-3232 INTRODUCTION Anaerobic treatment is a technology well suited to helping solve the serious environmental and social problems associated with animal wastes produced as by-products of animal enterprises. An anaerobic treatment system can be easily integrated into liquid waste handling systems which are commonly used on modern livestock farms.1 The benefits that anaerobic treatment of animal wastes can bring to livestock producers, such as energy generation and waste stabilization for odor control, have been well demonstrated by previous research.2"5 The remaining challenge is to develop cost-effective and easily adaptable anaerobic reactor systems for farm applications. Conventional anaerobic processes used for animal waste treatment are continuously stirred tank reactors (CSTR) and plug-flow reactors. These processes are suited for treating concentrated waste such as the animal waste collected by mechanical scrapers, but not economical for treating diluted liquid waste, such as the waste collected by flushing systems which are more popularly used for large and new farms. Efficient anaerobic reactors for treating dilute wastewaters must retain biomass solids in the reactor with a short hydraulic retention time (HRT). The Anaerobic Sequencing Batch Reactor (ASBR) has been under development at Iowa State University to meet this need6 and U.S. Patent No. 5,185,079 was issued for this technology. The unique feature of the ASBR is its ability to grow and retain biomass with a long solids retention time (SRT) through a natural selection process. It is simple to operate and requires low maintenance. The studies on the ASBR for swine waste treatment have been conducted since 1990. Dague and Pidaparti7 first tested the ASBR with swine waste at six volatile solids (VS) loading rates ranging from 1.0 to 6.8 g/L/day, one HRT (6 day), and two temperatures (25°C and 35°C). The ASBR proved to work satisfactorily. Schmit and Dague8 evaluated the ASBR at a lower temperature (20°C), three HRTs (6, 9, and 12 day), and different VS loading rates ranging from 0.9 to 5.0 g/L/day. Volatile solids reductions ranging from 40 to 60% were achieved. The study reported in this chapter was carried out to further evaluate the ASBR for treating swine waste at short HRTs (2, 3, and 6 day) at 25°C. WORKING PRINCIPLES OF THE ANAEROBIC SEQUENCING BATCH REACTOR The ASBR is a suspended growth reactor which operates in a cyclic batch mode with four distinct phases per cycle. The four phases are feed, react, settle, and decant, as shown in Figure 1. 51st Purdue Industrial Waste Conference Proceedings, 1996, Ann Arbor Press, Inc., Chelsea, Michigan 48118. Printed in U.S.A. 315 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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