https://geonika.agis.uniba.sk/tsenz/index.php?action=history&feed=atom&title=Biochemical_oxygen_demand_%28BOD%29 2026-04-07T13:08:21Z História úprav pre túto stránku na wiki MediaWiki 1.31.1 https://geonika.agis.uniba.sk/tsenz/index.php?title=Biochemical_oxygen_demand_(BOD)&diff=141&oldid=prev 2014-07-16T13:54:09Z

<p>Importing text file</p> <p><b>Nová stránka</b></p><div>:Slovak term: [[Slovenský termín]]<br /> # The amount of oxygen that is required to biochemically convert organic matter into inert substances; an indirect measure of the amount of biodegradable organic matter present in the water or wastewater.<br /> <br /> ==Explanation==<br /> The biochemical oxygen demand (BOD) is an empirical test, in which standardised<br /> laboratory procedures are used to estimate the relative oxygen requirements of<br /> wastewaters, effluents and polluted waters.<br /> <br /> The BOD is used as an approximate measure of the amount of biochemically degradable<br /> organic matter present in a sample. BOD is usually measured in milligrams of oxygen per<br /> litre, mg/L.<br /> <br /> Standardised laboratory procedure determines BOD by measuring the amount of oxygen<br /> consumed after incubating the sample in the dark at a specified temperature for a specific<br /> period of time, usually five days. The oxygen consumption is determined from the difference<br /> between the dissolved oxygen concentrations in the sample before and after the incubation<br /> period.<br /> <br /> BOD is usually reported as an indicator of organic matter contamination. Some rivers and<br /> water courses in tropical environments, shows values such as 40 mg/l of BOD in nature<br /> (Nemerow, 1971). Typical values of BOD for domestic wastewater are between 200-500<br /> mg/l and for industrial wastewater could rise values such as 10,000 to 22,000 mg/l for<br /> industrial efluent for production of alcohol elaborated from sugar cane (Silva e Mara,<br /> 1979).<br /> <br /> ==Example==<br /> “The suspended solids load in sullage is lower than in wastes from toilets, but it contains<br /> more grease and is generally at a higher temperature. Kitchen wastes have a higher<br /> suspended solids content, a higher biochemical oxygen demand, and a higher nitrate<br /> concentration than other sullage.”<br /> <br /> ==References==<br /> * WHO (2006) Guidelines for the safe use of wastewater, excreta and greywater<br /> * WHO (1992) A guide to the development of on-site sanitation<br /> * Silva, A.S e Mara, D.D. (1979) Tratamentos Biológicos de Águas Residuarias: Lagoas de<br /> * Estabilização, Rio de Janeiro, ABES.<br /> * Nemerow, N. L. (1971) Liquid waste of industry: theories, practices and treatment,<br /> * Syracuse University. Ed. Addison Wesley<br /> <br /> ==Links==<br /> * [http://apps.who.int/thelexicon/ WHO — The Health and Environment Lexicon]<br /> * [UNEP, WHO (1996) Water quality monitoring: a practical guide to the design and]<br /> * [implementation of freshwater quality studies and monitoring programmes]<br /> <br /> [[Category:EN]]</div>

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