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bacteria bed

См. также в других словарях:

  • bacteria bed — noun layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms • Hypernyms: ↑filter * * * bacteria bed noun A filter bed • • • Main Entry: ↑bacteria …   Useful english dictionary

  • Bed bug — Cimex lectularius Scientific classification Kingdom: Animalia …   Wikipedia

  • Deep sand bed — A deep sand bed is[1] a filtration method used in some saltwater aquariums. A deep sand bed, similar to the Berlin Method, is designed to cultivate anaerobic bacteria in the bottom layers of sand, converting nitrate to nitrogen gas to remove… …   Wikipedia

  • deep sand bed — a filtration method in marine aquaria consisting of layers of sand up to 6 inches deep where anaerobic bacteria can grow and convert unwanted nitrates to nitrogen gas. Associated invertebrates burrow in the sand and facilitate a deeper… …   Dictionary of ichthyology

  • fluidising bed — a biological filtration system used in aquaria comprising of small beads in a cylinder. Bacteria grow on the beads and denitrify the water as it is forced through the cylinder …   Dictionary of ichthyology

  • environmental works — ▪ civil engineering Introduction       infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …   Universalium

  • Constructed wetland — Vertical Flow type of Constructed Wetlands A constructed wetland or wetpark is an artificial wetland, marsh or swamp created as a new or restored habitat for native and migratory wildlife, for anthropogenic discharge such as wastewater,… …   Wikipedia

  • Sewage treatment — The objective of sewage treatment is to produce a disposable effluent without causing harm to the surrounding environment, and also prevent pollution.[1] Sewage treatment, or domestic wastewater treatment, is the process of removing contaminants… …   Wikipedia

  • Health and Disease — ▪ 2009 Introduction Food and Drug Safety.       In 2008 the contamination of infant formula and related dairy products with melamine in China led to widespread health problems in children, including urinary problems and possible renal tube… …   Universalium

  • respiratory disease — ▪ human disease Introduction  any of the diseases and disorders that affect human respiration (respiration, human).  Diseases of the respiratory system may affect any of the structures and organs that have to do with breathing, including the… …   Universalium

  • Nosocomial infection — Classification and external resources Contaminated surfaces increase cross transmission ICD 10 Y …   Wikipedia

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