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  2. Tetramethylammonium chloride - Wikipedia

    en.wikipedia.org/wiki/Tetramethylammonium_chloride

    The chemical formula (CH 3) 4 N + Cl − is often abbreviated further as Me 4 N + Cl −. It is a hygroscopic colourless solid that is soluble in water and polar organic solvents. Tetramethylammonium chloride is a major industrial chemical, being used widely as a chemical reagent [1] and also as a low-residue bactericide in such processes as ...

  3. Clarifier - Wikipedia

    en.wikipedia.org/wiki/Clarifier

    Circular clarifier with surface skimmer visible in the lower right. As the skimmer slowly rotates around the clarifier, skimmed floating material is pushed into the trap visible above the fenced enclosure at the lower left. Clarifiers are settling tanks built with mechanical means for continuous removal of solids being deposited by ...

  4. UV filter - Wikipedia

    en.wikipedia.org/wiki/UV_filter

    UV filters were used to filter out shorter ultraviolet wavelengths while remaining transparent to visible light. However, the modern-day photographic film and digital cameras are less sensitive to UV wavelengths. UV filters are sometimes referred to as L37 or L39 filters, depending on the wavelengths of light they filter out.

  5. Facultative lagoon - Wikipedia

    en.wikipedia.org/wiki/Facultative_lagoon

    Facultative lagoon (polishing pond) providing tertiary treatment after a constructed wetland in Hamburg-Allermöhe, Germany. Overflow from the facultative lagoon may be routed through one or more polishing ponds supporting lower populations of anaerobic micro-organisms and a higher proportion of aerobic organisms adapted to survival in lower concentrations of organic material.

  6. Aerated lagoon - Wikipedia

    en.wikipedia.org/wiki/Aerated_lagoon

    An aerated lagoon (or aerated pond) is a simple wastewater treatment system consisting of a pond with artificial aeration to promote the biological oxidation of wastewaters. [1] [2] [3] [4]

  7. Secondary treatment - Wikipedia

    en.wikipedia.org/wiki/Secondary_treatment

    This small secondary clarifier at a rural sewage treatment plant is a typical phase separation mechanism to remove biological solids formed in a suspended growth or fixed-film bioreactor. Secondary treatment (mostly biological wastewater treatment ) is the removal of biodegradable organic matter (in solution or suspension) from sewage or ...

  8. Clarifying agent - Wikipedia

    en.wikipedia.org/wiki/Clarifying_agent

    Particles finer than 0.1 μm (10 −7 m) in water remain continuously in motion due to electrostatic charge (often negative) which causes them to repel each other. [citation needed] Once their electrostatic charge is neutralized by the use of a coagulant chemical, the finer particles start to collide and agglomerate (collect together) under the influence of Van der Waals forces.

  9. Waste stabilization pond - Wikipedia

    en.wikipedia.org/wiki/Waste_stabilization_pond

    The second type of pond, facultative stabilization ponds, sustain an aerobic surface habitat above an anaerobic benthic habitat. [12] Maturation ponds offer aerobic conditions throughout, from the surface to the bottom. The main configurations of pond systems are: [4] [13] Facultative pond only; Anaerobic pond followed by a facultative pond;

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