Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of...
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Transcript of Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of...
![Page 1: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/1.jpg)
Victoria Bight: Mother Nature's Sewage Treatment Plant?
Edward E. IshiguroDepartment of Biochemistry &
MicrobiologyUniversity of Victoria
![Page 2: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/2.jpg)
![Page 3: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/3.jpg)
My Goals
• What are the objectives of conventional sewage treatment and how are these objectives achieved?
• What is known for sure about the Victoria process?
• Why should we treat our sewage?
![Page 4: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/4.jpg)
The Victoria sewage treatment system
![Page 5: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/5.jpg)
The Victoria sewage treatment system
![Page 6: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/6.jpg)
What is sewage?• Includes everything that goes down all of the drains in your
home
• What you can see in sewage is not all that is really there
– i.e., perhaps as much as 70% of the organic matter gets past the screening process (soluble material and small particles, much of which is not visible)
![Page 7: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/7.jpg)
The main objectives of conventional sewage
treatment
• Eliminate fecal-borne microbial pathogens (e.g., chlorination)
• Decompose all complex organic matter to simpler chemicals (composting)
![Page 8: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/8.jpg)
Conventional sewage treatment
![Page 9: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/9.jpg)
Summary
• Secondary sewage treatment is the minimum requirement for satisfying the two main objectives of sewage treatment
• The claim is that the Victoria treatment is as good as any conventional secondary treatment system.
![Page 10: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/10.jpg)
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![Page 11: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/11.jpg)
What is known for sure about the Victoria process: more take-home lessons• We release large amounts of
organic matter into the ocean.
• Contrary to claims, there are no data that directly demonstrate the quick and effective decomposition of this matter because there are no methods for obtaining such data.
![Page 12: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/12.jpg)
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![Page 13: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/13.jpg)
Scenario 1: our sewage treatment is not working
• Cold temperature may have negative effect on metabolic rate of bacteria
• If true, then where is the undigested organic material in sewage accumulating?
![Page 14: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/14.jpg)
Scenario 2: it is working well
• Then, how much fertilizer can the ocean take?
• Too much may be harmful
![Page 15: Victoria Bight: Mother Nature's Sewage Treatment Plant? Edward E. Ishiguro Department of Biochemistry & Microbiology University of Victoria.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e255503460f94b141cf/html5/thumbnails/15.jpg)
150 'dead zones' counted in oceans
U.N. report warns of nitrogen runoff killing fisheries
MSNBC staff and news service reportsUpdated: 1:12 p.m. ET March 29, 2004
----------------------------------------------------------------• Lifeless, oxygen-depleted regions
• Caused by release of excessive nutrients, e.g., from farm fertilizer, sewage, etc.
• U.N.’s top emerging ecological challenge
– Total of 150 zones covering 27,000 square miles
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Sewage treatment: a characteristic associated with
civilization• United Nations estimates 2.4 billion people
lack access to basic sanitation, including sewage treatment
– We are not included in this number!
• United Nations Millennium Declaration (2000) proposes to cut this number by half by 2015