Utama > Industrial Effluent Treatment System > Facultative Pond Written Approval

Facultative Pond Written Approval

Facultative pond is the most common type of stabilization pond. It is usually 1.2 – 2.5 m (4ft – 8 ft) in depth, with an aerobic layer overlying an anaerobic layer, ofter containing sludge deposits. The retention time is usually 25 – 180 days. Organic loading rates on facultative pond is expressed in term of kg BOD5 applied per hectare of surface area per day (kg BOD/(ha.d). Typical organic loading 22 to 67 kg BOD/ha.d)

Ref.  C.C Lee & Shun Dar Lin, Handbook of Environmental Engineering Calculation. Mc-Graw-Hill, 2nd edition.

Compilation documents :

  • Form AS16
  • Waste water characteristic study
  • Process Flow Chart
  • Design Calculation
  • Letter of Guarantee
  • Drawings
  1. ontera
    Oktober 5, 2010 at 8:27 am

    Assumption in pond design :

    Assumed that the model is completely mixed reactor without solid recycle. In case of facultative system, complete mixing is applied only the liquid portion of reactor.

    Solids that fall to the bottom are not resuspended.

    Soluble food is assumed to be uniformly distributed throughout the reactor by mixing of the liquid.

    Ref : Environmental Engineering, Howard, Donald, George . McGraw-Hill International

  2. ontera
    Oktober 26, 2010 at 5:28 am

    Under favourable condition in which both aerobic and anaerobic zone exist, the facility called facultative pond.The method of treatment employed is organic material decomposition by bacteria activities by aerobic and anaerobic treatment. Aerobic process take place at shallow level in which dissolved oxygen is present. Aerobic condition is maintained in the upper portions of the pond by oxygen generated by algae, and, to a lesser extent by penetration of atmospheric oxygen. Mixing by wind action and penetration by sunlight may extend the aerobic area downward.
    Further deep, oxygen is absent, calm waters and weak lighting results in the anaerobic layer.

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