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    Waste Water Treatment

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    SUIXIDE

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    © All Rights Reserved
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    Waste Water Treatment

    Uploaded by

    SUIXIDE
    5 views12 pages

    Original Title

    waste water treatment

    Copyright

    © © All Rights Reserved

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    PPTX, PDF, TXT or read online from Scribd

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    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    5 views12 pages

    Waste Water Treatment

    Uploaded by

    SUIXIDE

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 12

    Water cycle

    Distillation process
    Waste water treatment
    https://www.youtube.com/watch?v=s8IVjQg7yno&t=52s
    • Waste can be removed by:
    • Connection to a system of sewer pipes or sewerage, that collects human
    faeces, urine and waste water.
    • Connection to a septic system, which consists of an underground, sealed
    settling tank.
    • Flush toilet: uses a holding tank for flushing water, and a water seal that
    prevents smells.
    • Pour toilet: has a water seal but uses water poured by hand for flushing.
    • Pit latrine: type of toilet that collects human faeces in a hole in the
    ground that is sometimes ventilated to take away smells.
    • Composting toilet: dry toilet in which vegetable waste, straw, grass,
    sawdust, and ash are added to the human waste to produce compost.
    • • Treatment of sewage: aims to reduce the Biological Oxygen Demand
    (BOD) of the sewage.
    • Sewage outfall: waste water from homes and industries is taken to a
    sewage treatment plant in sewers.
    • Screening tank: large objects are removed from the waste using a
    coarse grid.
    • Primary treatment, first settling tank: solid organic matter, mainly
    human waste, settles at the bottom of the tank (sludge), which is
    treated in a sludge-digester.
    • Clean water then overflows the sides of the tank and is taken to the
    next stage.
    • ▪. Secondary treatment, oxidation: water is pumped into a tank
    where oxygen is bubbled through it.
    • ▪ This encourages the growth of bacteria and other microbes
    that break down organic matter, which cause BOD.
    • Secondary treatment, second settling tank: water enters,
    where bacteria settle to the bottom, forming more sludge.
    • ▪ This cleaner water overflows the sides of the tank as effluent,
    usually discharged into a river.
    • Sludge digester: oxygen-free conditions are created that
    encourage the growth of bacteria which can break down the
    sludge, releasing methane, that can be burnt.
    • ▪ Treated sludge can be dried in sludge lagoons and used as
    organic fertiliser on farmland.
    • Tertiary treatment: further filtering out of its effluent or its
    chlorination which produces even cleaner effluent that
    protects the habitat in which it is released.
    • Water treatment:
    • Water is made potable by undergoing coagulation treatment, being
    filtered and disinfected.
    • Coagulation: Particles in the water are stuck together and settle to the
    bottom of the container.
    • Water is then filtered through sand.
    • Chlorination: to kill remaining pathogens, chlorine is added as a
    disinfectant.

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