23 - EARTH AND PLANETARY SCIENCES 80 Professor Berry Lecture 23 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley

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EARTH AND PLANETARY SCIENCES 80 Professor Berry 4/19/10 Lecture 23 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. ANNOUNCEMENTS I’d just like to point out that today’s lecture will help you answer one of the questions on your final exam prompts. The final essay will be 4-6 pages in length, and you must answer both prompts. I would like to get started today, because our speaker is doing his lecture on his lunch time. We are going to have a novel story about the water waste story. He is a Cal grad and works for the Dow Chemical Company. Today we have an innovative way of getting rid of waste in ground water. Randy Fishback is here to talk to us about this. You can hand in papers after class. LECTURE It’s been my privilege to come here for the past 7 or 8 years. I am a chemical engineering graduate from Cal. I’m happy to be coming back and tell ing you what I am doing with my chemical engineering background. I’ve been working with Dow for just over 30 years. Bioremediation is a project that I have been involved with. What is bioremediation ? It is a treatment process that uses naturally occurring microorganism to breakdown or degrade hazardous substances into less toxic or non-toxic substances. One key element is that we are using naturally occurring chemicals to clean up man made ones. We do something called in situ bioremediation. It means in situation, in place. In situ means doing it right where the contamination occurs. We supply oxygen and nutrients to the existing microorganisms in the soil. They eat the food along with the contaminants, and break them down into basically carbon dioxide, water and salts. When I talk about microorganisms, I am talking about tiny bacteria in the soil. We basically feed these organisms so that their colonies become more robust. When we supply naturally occurring bacteria with nutrients, they increase their need for food, and as a result they consume more hazardous chemicals for food. This results in them breaking down the substances. The existing one-celled bacteria at our site are called the dehalococcoides ethenogenes . We feed them propylene glycol, which they eat and digest, along with chlorinated solvents existing in the soil. What is interesting is that there are a lot of microbes
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23 - EARTH AND PLANETARY SCIENCES 80 Professor Berry Lecture 23 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley

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