https://geonika.agis.uniba.sk/tsenz/index.php?action=history&feed=atom&title=Scum 2026-04-07T10:51:20Z História úprav pre túto stránku na wiki MediaWiki 1.31.1 https://geonika.agis.uniba.sk/tsenz/index.php?title=Scum&diff=241&oldid=prev 2014-07-31T15:23:31Z

<p>Importing text file</p> <p><b>Nová stránka</b></p><div>:Slovak term: [[Slovenský termín]]<br /> # Layer of suspended solids less dense than water and floating on top of liquid waste from which they have separated by flotation (WHO 1992).<br /> <br /> ==Explanation==<br /> Grease, oil, and other materials that are less dense than water float up to the liquid<br /> surface, forming a layer of scum which can become quite hard. Scums are less of a problem<br /> in marine water than in fresh water, as the frequency of occurrence of scums is higher in<br /> lakes than in coastal areas.<br /> <br /> Biological organisms can form scums. Some species of cyanobacteria are capable of causing<br /> dense scums, which contain high concentrations of cells. Since most toxin is intracellular,<br /> scums caused by toxigenic strains of cyanobacteria may contain elevated concentrations of<br /> toxin. The existence of a cyanobacterial scum caused by a toxigenic species represents an<br /> increased human health hazard.<br /> <br /> Blooms of non-toxic phytoplankton species and mass occurrences of macro-algae can affect<br /> the amenity value of recreational waters due to reduced transparency, discoloured water<br /> and scum formation (WHO 1992).<br /> <br /> ==Example==<br /> “A septic tank is an underground watertight settling chamber into which raw sewage is<br /> delivered through a pipe from plumbing fixtures inside a house or other building. The<br /> sewage is partially treated in the tank by separation of solids to form sludge and scum.”<br /> (WHO 1992).<br /> <br /> ==References==<br /> * WHO (1992) [http://www.who.int/water_sanitation_health/hygiene/envsan/onsitesan/en/ A guide to the development of on-site sanitation]<br /> <br /> ==Links==<br /> * [http://apps.who.int/thelexicon/ WHO — The Health and Environment Lexicon]<br /> * WHO (1999) [http://www.who.int/water_sanitation_health/resourcesquality/toxicyanbact/en/index.html Toxic cyanobacteria in water: a guide to their public health consequences, monitoring, and management]<br /> * WHO (2000) [http://www.who.int/water_sanitation_health/bathing/bathing3/en/index.html Monitoring bathing waters: a practical guide to the design and implementation of assessments and monitoring programmes]<br /> <br /> [[Category:EN]]</div>

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