Flow Variations:
Flow variations is much dependent on the water usage patterns.
Peak hours are commonly before work in the morning, lunch time and after work in the evening.
Odor:
Raw (fresh) wastewater has a distinctive musty odor. If anaerobic decomposition has taken place Hydrogen Sulfide (H2S) is likely to be present. H2S has a distinctive rotten-egg smell and is poisonous.
Color:
Raw wastewater usually has a light brownish gray color.
The longer it has been kept or undergone anaerobic conditions (decomposition and septic), the darker the color will become — from gray to dark gray, and ultimately black color.
Turbidity:
Turbidity is a measure of the light-transmitting property property of water, and indicates colloidal and suspended matters. However it can be interfered by color of the water as well. Generally there is no relationship between turbidity and TSS concentration for raw wastewater. However a reasonable relationship between TSS and turbidity may exist for settled and filtered effluent.
Alkalinity:
Alkalinity is a measure of the ability to neutralize acid. Nitrification will consume alkalinity and may lower pH, while denitrification will generate alkalinity and may increase pH.
Chemical Oxygen Demand:
COD:BOD5 ratios < 3 usually indicates the wastewater is suitable for biological treatment processes
Conductivity:
Conductivity measures the ability of the aqueous solution to carry an electrical current and indicates the dissolved inorganic material present in the water. In domestic wastewater it is usually in the range of 50 to 1500 uS/cm.
Dissolved Oxygen:
DO is amount of free oxygen molecules dissolved inside water.
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