Water Quality Engineering Summary

Water Quality Definition

• Water quality assesses condition relative to biotic species and human needs.
• Standards: health of ecosystems, safety for human contact, and drinking water quality.

Factors Affecting Water Quality

• Key factors: sedimentation, runoff, erosion, dissolved oxygen, pH, temperature, organic materials, pesticides, hazardous substances, and more.
• Environmental elements from air (e.g., pollutants) affect rainfall and water composition.
• Industrial and agricultural activities increase nutrient and contaminant levels in water bodies.

Types of Contaminants

• Natural (e.g., leaves, animal feces), agricultural (e.g., runoff, fertilizers), industrial, microbial, and human-added contaminants.

Physical Characteristics of Water

• Measured by senses: temperature, color, turbidity, taste, and odor.
• Key physical parameters include:
  • Temperature
  • Electrical conductance (EC)
  • Total suspended solids (TSS)
  • Total dissolved solids (TDS)

Chemical Characteristics of Water

• Dissolved substances (organic and inorganic) impact water quality:
  • Total dissolved solids (TDS) as a key measure.
  • Parameters include pH, electrical conductivity, total solids, hardness, and the presence of sulfates and chlorides.
• Biological health indicated by dissolved oxygen levels, BOD, and COD.

Biological Parameters

• Water quality influenced by microorganisms; pathogens indicate pollution.
• Indicator organisms (e.g., coliforms) signal potential contamination from human waste.

Importance of Water Quality Guidelines

• Guidelines promote ecosystem health and protect drinking water standards.

Drinking Water Treatment Process

• Treatment targets impurities: physical, chemical, and biological.
• Treatment stages: coagulation, flocculation, sedimentation, filtration, disinfection.