4.0 Domestic Wastewater Characteristics

The following are general characteristics for domestic wastewater. The regulations covering the sizing of on-lot disposal systems are based on the assumption that the wastewater is similar to domestic wastewater . Therefore, it may be necessary to provide additional pretreatment or enlarge the on-lot disposal system for higher strengthen wastewaters, such as: restaurants, breweries, nursing homes, hospitals, etc.

    Table 1
    Typical Characteristics of Domestic Wastewater
    Parameter
    Typical Concentration
    Total Coliform
    1 billon to ov
    Fecal Coliform
    100,000 to 1
    BOD 5
    200 to 290
    COD
    680 to 730
    Total Nitrogen
    35 to 100 m
    Ammonia
    6 to 18 mg
    Nitrate + Nitrite
    < 1 mg N / L
    Total Phosphorous
    18 to 29 mg
    Ortho Phosphorous
    6 to 24 mg P
    Total Solids
    680 to 1000
    Volatile Solids
    80 to 500
    Suspended Solids
    200 to 290
    Volatile Suspended Solids
    150 to 240
    Source: US EPA, Design Manual: Onsite Wastewater
    Treatment and Disposal Systems, October 1980.
    Table 2
    Pollutant Concentration of Major Components
    of Residential Wastewater in mg / L
    Parameter
    Garbage Grinders
    Basin/Toilet
    Sink/Appliances
    Combined Wastewater
    BOD5
    2380
    280
    260
    360
    Suspended S
    3500
    450
    160
    400
    T. Nitrogen
    79
    140
    17
    63
    T. Phosphoro
    13
    20
    26
    23
    Source: US EPA, Design Manual: Onsite Wastewater
    Treatment and Disposal Systems, October 1980.
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