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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
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