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Fundamentals about aeration treatment:
Aeration is a process to provide dissolved oxygen to micro-organisms (aerobes) in the aerated liquid to degrade (or convert) organic wastes to carbon dioxide and water.
Types of Aeration processes & equipment,
is using in different designs, depending upon the need of the project and financial capability of the client:
: For temperature reduction, CO2 stripping, Odour control etc, mainly for low cost designs.
: For mixing and aerating of wastewater in batch tanks.
Venturi Aeration System
: Most versatile process. Used in all our designs.
Micro Bubble Generator
: For production of 10-50 micron air bubbles for advanced oxidation, pathogen control, floatation and enhanced coagulation.
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Effect of aeration on BOD and sludge concentration in the liquid
The changes in BOD and sludge accumulation (biomass) can be divided into four phases after aeration starts in a batch process.
In phase one
, micro-organisms are adapting themselves to the aeration environment and store necessary nutrients for growth, during which little biomass production and BOD reduction are observed.
In the second phase,
rapid growth of aerobic bacteria and accelerating removal of BOD are taking place, accompanied by high demand of oxygen.
indicates the end of growth period with moderate oxygen demand and the onset of cell autolysis.
It is followed by
when cell destruction increases with low oxygen demand.
Years of research have ascertained that
BOD is a reliable indicator of odour offensiveness from organic wastes including animal manure.
So reducing BOD in wastewater under aeration treatment becomes critical to controlling odour emission.
Also, the efficiency and effectiveness of aeration systems in mitigating fouling odour production can be evaluated by examining the extent and rate at which BOD is removed.
The advantages of aeration treatment of liquid wastes include:
Minimum odour when properly loaded and maintained.
Large BOD removals providing a good quality effluent.
High rate treatment allowing smaller scale systems, e.g., less land required (for mechanical aeration only).
The final discharge contains proper level of dissolved oxygen which reduces the immediate oxygen demand on a receiving water.
The aerobic environment eliminates many pathogens present in agricultural and organic wastes.
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