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What Is The Activated Sludge Growth Curve
- Jun 22, 2018 -

What is the activated sludge growth curve?


What is the activated sludge growth curve?


Activated sludge microorganisms are mixed populations of multiple strains, and their growth laws are more complex, but their growth curves can also be used to represent certain patterns. The curve expresses that the environmental conditions such as temperature and dissolved oxygen meet the growth requirements of microorganisms, and when a certain amount of initial microorganisms are inoculated, the amount of microorganisms proliferates and decays with time after a full dosage of nutrients.

The change of growth rate of activated sludge is mainly caused by the ratio of nutrient or organic matter to microbe (usually expressed as F/M). The F/M value is also the rate of organic substrate degradation, oxygen utilization rate, agglomeration of activated sludge, and adsorption performance. Important influencing factors.

The four stages of the growth curve of activated sludge: adaptation period, logarithmic growth phase, deceleration growth phase (maximum biomass), and endogenous respiratory period (best for treatment of water quality).


Activated sludge purification is divided into several processes?


Activated sludge purification wastewater is completed in three stages:

In the first stage, the wastewater is mainly purified by the adsorption of activated sludge. Adsorption proceeds very rapidly and is generally completed within 30 minutes, and the BOD5 removal rate can be as high as 70%. It also has a partial oxidation effect, but adsorption is the main role.

The second phase, also known as the oxidation phase. It is mainly to continue to decompose the organic substances that are adsorbed and absorbed during the pre-oxidation phase, while continuing to adsorb some residual dissolved substances.

The third stage is the separation of mud and water. In this stage, activated sludge is precipitated in the secondary settling tank. The anabolism and catabolism of microorganisms can remove organic pollutants in sewage, but the products are different