Wastewater Onsite

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EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

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Wastewater Onsite

Transcript of Wastewater Onsite

  • EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS

    EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS

    EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

  • Content

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    0 Water quality parameter

    0 Sources and classification of pollutants

    0 Water quality control policy

    0 Impact of pollutant to environment and

    human

    0 Waste water treatment technologies

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-site disposal system

    Municipal wastewater treatment system

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-Site Disposal System

    Usually chosen when:

    Lot size are larger and house are spaced widely.

    Small and may serve individual house or small housing developments or isolated commercial establishments.

    Requires:

    Septic tank, a distribution box and an absorption field.

    Septic tank & absorption field are a unit, neither part will function as intended without the other.

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-Site Disposal System

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-Site Disposal System

    Septic Tank

    To remove large particles and grease (avoid clog on tile field).

    Heavy solids settle, undergo biological decomposition.

    Grease floats to the surface and is trapped.

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-Site Disposal System

    Clarified effluent then flows (or is pumped via a pump well) to the absorption trench or bed for treatment and disposal through distribution pipes, and then filtered through the gravel and sand to the underlying soil.

    Bacteria produce a slime layer at the bottom of the trench (called clogging mat).

    A clogging layer or biomat develops along the bottom and sides of the trench and acts as a further filter.

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-Site Disposal System

    Cross section of absorption trench

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-Site Disposal System

    This filtering process helps remove pathogens, toxins and other pollutants. Nutrients in the effluent are taken up by vegetation (normally grass) planted across the absorption trench area.

    Creates a barrier, slows the movement of water into the surrounding soil, keep unsaturated, permit air to move through soil, maintain aerobic condition for proper effluent treatment.

    Normal lifetime 20-30 years, soil becomes clogged with organic matter.

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-Site Disposal System

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    WATER POLLUTION & WASTEWATER

    On-Site Disposal System

    Roots can block pipes, crushed by vehicle, hydraulically overloaded, toxic substance of soil bacteria disposed.

    Common reason: improper maintenance. Solids in the tank accumulate over time, clear water zone becomes small, carry over of solids to absorption field. To avoid, the solids (sludge) in septic tank should periodically removed .

  • Wastewater Treatment

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    EE304 ENVIRONMENT ENGINEERING & ABATEMENT PROCESS EP317 ENVIRONMENT ENGINEERING AND ABATEMENT PROCESS EG202 ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    Municipal Wastewater Treatment

    1) Pretreatment Provide protection to wastewater

    treatment plant equipment

    2) Primary Treatment Remove pollutant that settle or float

    (60% SS, 35% BOD5)

    3) Secondary Treatment Speedup the breakdown of the

    degradable organic pollutants (85% BOD5)

    4) Tertiary treatment Chemical and filtration (95 %BOD5,

    phosphorous, suspended solids and bacteria, 95% nitrogen)