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Introduction
Dissolved Oxygen oxygen (DO) is an essential measurement parameter in aerobic bioreactors. The growth of all cells is heavily dependent on DO because it acts as a terminal electron acceptor in aerobic respiration. However, if excessive amount of DO is added to the process, it may limit the growth of the culture and promote undesirable organisms. Consequently, the measurement of DO is critical to effective operation of systems. Today, a variety of sensors are available in the market, each with its own advantages and disadvantages.
Background
Dissolved Oxygen oxygen is really a physical distribution of oxygen molecules in water. Oxygen does not react with water, but mixes with it. There are two main sources of DO in water: atmosphere and photosynthesis.
http://www.eutechinst.com/techtips/tech-tips15.htm
Ambient air contains about 20% oxygen and is essential for breathing, also for fish and other aquatic organisms need oxygen to breathe as wellorganism. Dissolved oxygen is the amount of free oxygen in water suitable for the breathing purpose. If there is not enough oxygen, it is letal to fish: the amount of 2 mg/l is already deadly and the amount between 2 and 5 mg/l affects fish health.
is this relevant to DO? Also dissolved oxygen data or BOD (biological oxygen demand) is needed to determine effluent water quality. It is a common environmental procedure to determine the amount of microorganisms in a sample. This measurement is used in wastewater treatment, food manufacturing and filtration facilities where this quantity is important for the process and final product. “High concentrations of DO predict that oxygen uptake by microorganisms is low along with the required break down of nutrient sources in the medium” (http://www.eidusa.com/Theory_DO.htm).
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- Winkler titration
- Air-saturated water
- Water-saturated air
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References
Erlich Industrial Development. D. O. theory. http://www.eidusa.com/Theory_DO.htm
Eutech Instruments, 1997. Introduction to Dissolved Oxygen. http://www.eutechinst.com/techtips/tech-tips15.htm
Hanna instruments. Dissolved Oxygen and BOD meter, HI98186. http://www.hannainst.com/usa/prods2.cfm?ProdCode=HI%2098186&id=004002
YSI, 2009. The Dissolved Oxygen Handbook. https://www.fondriest.com/pdf/ysi_do_handbook.pdf
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