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AnNajah National University Civil Engineering Department. Environment Engineering I. Chapter Eight -section 1. Water Quality Management. Dr. Amal Hudhud Dr. Abdel Fattah Hasan. Introduction.

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Environment engineering i

AnNajah National University

Civil Engineering Department

Environment Engineering I

Chapter Eight -section 1

Water Quality Management

Dr. Amal Hudhud

Dr. Abdel Fattah Hasan


How we used the water in lake , river, pond, stream is generally influence by the quality of water found on.

Water quality managers are concerned with controlling pollution from human activity

Assimilated means : to know how much waste can be tolerated by a water body


  • By understanding how pollutants effects water quality, Environment Engineer can properly design treatment facilities

  • This chapter deals with the major types of pollutants and their resources, water quality management in river and Groundwater quality


Water pollutants & their resources

Point sources 1
Point sources (1)

  • Example: domestic and industrial wastes, they collected by networks and converted to a single point.

  • Can be reduced by minimizing waste and proper WWT

Non point sources 2
Non Point sources(2)

1) Example :urban and agricultural runoff

2)Multiple discharge points, polluted

water flows over the surface of the land

3) Treatment is more difficult

Oxygen demanding materials 3
Oxygen demanding Materials (3)

Anything that can be oxidized in the

receiving water resulting in the

consumption of Dissolve oxygen (DO)

Example : human waste and food residue

Depletion of DOthreat fish and other

aquatic life

Nutrients 4
Nutrients (4)

  • Nitrogen & Phosphorus

  • All living thing require them for growth

  • Problem arise when nutrients level become excessive lead to large growth of algae which turn to Oxygen Demanding Materials

Pathogenic organisms 5
Pathogenic organisms (5)

  • Found in Waste water

  • Example : bacteria, viruses, Protozoa

  • Discharge to surface water make water unfit for drinking, swimming or to fishing

Suspended solids 6
Suspended solids (6)

  • Organic and inorganic particles carried by wastewater to a receiving body can be settled if the flow velocity reduced

  • Organic particle cause depletion of DO

  • Non organic particle leads to light penetration decrease, cause turbidity, bacteria growth

Salts 7
Salts (7)

  • Total dissolve solids : salts and other matter that do not evaporate

  • Increase salt concentration

    • threaten natural population of plants and animals

    • Threaten public water supply and irrigation

    • Soil poisoning

Toxic metals and toxic organic compounds 8
Toxic Metals and toxic organic compounds(8)

  • Sources: Industrial waste water, pesticides .herbicides

  • Urban and agricultural Runoff


  • Endocrine disrupting chemicals

  • Arsenic (Naturally occur)

  • Heat : increase of water temperature effect on :

    • Salmon migration,

    • increase of Oxygen Depletion rate,

Water quality management in river
Water Quality Management in River

Water quality management includes:

  • Measure the pollutants

  • Predict their effect on water quality

  • Determine background water quality that would be present with human intervention

  • Decide the levels acceptable for intended uses of the water

Water quality management considered
Water quality management considered:

  • The nature of pollutants

  • The characteristic of individual river

  • Climate of the region

  • Land use patterns

  • Type of aquatic life in the river

Oxygen demanding materials and nutrients
Oxygen–demanding materials and nutrients

  • Oxygen –demanding materials and nutrients are the most common polluters in almost all type of river

  • Organic oxygen demanding materials are commonly measured by determining the amount of oxygen consumed during degradation of organic matter