Biochemical oxygen demand | Wikipedia audio article
Channel: wikipedia tts
Date: 27/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Biochemical_oxygen_demand


00:00:49 1 Background
00:04:48 1.1 Typical values
00:05:42 2 Methods
00:05:55 2.1 Dilution method
00:09:57 2.2 Manometric method
00:11:06 3 Alternative methods
00:11:15 3.1 Biosensor
00:13:27 3.2 Fluorescent RedOx Indicator
00:14:10 3.3 Software sensor
00:15:01 4 Dissolved oxygen probes: Membrane and luminescence
00:18:15 5 Test limitations
00:18:35 5.1 Toxicity
00:19:14 5.2 Appropriate microbial population
00:20:07 6 History
00:22:19 7 See also



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SUMMARY
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Biochemical Oxygen Demand (BOD, also called Biological Oxygen Demand) is the amount of dissolved oxygen needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.  The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 °C and is often used as a surrogate of the degree of organic pollution of water.BOD can be used as a gauge of the effectiveness of wastewater treatment plants. BOD is similar in function to chemical oxygen demand (COD), in that both measure the amount of organic compounds in water. However, COD is less specific, since it measures everything that can be chemically oxidized, rather than just levels of biodegradable organic matter.