Activated Sludge process:
- It is the sewage treatment process in which the production of an activated mass of micro-organism is done which stabilizes the waste aerobically.
- It was developed in the year 1914 in England, by Aedern and Lockett.
- Activated Sludge indicates that the one obtains sludge by setting the sewage in presence of abundant oxygen.
Properties:
The properties of activated sludge are as follows:
- They have the fertilizing constituents.
- One can indicate the degree of aeration by the colour of the activated sludge.
- Light brown colour indicates under-aerated sludge.
- Golden brown colour indicates well aerated sludge.
- Muddy Brown coloue indicates over-aerated sludge.
Advantages of Activated Sludge Process:
The advantages are as follows:
- Firstly, it has low installation cost.
- Secondly, the quality of effluent is good.
- In addition, it has compact design so the land requirement is less.
- The loss of head is comparatively very small.
- Lastly, the effluent does not have the strong odour.
Disadvantages of Activated Sludge Process:
The disadvantages are as follows:
- Firstly, Changes in the quality of the sewage makes an adverse effect on the process of treatment.
- The operation cost is high.
- If the quantity of wet sludge increases it needs different method for disposal.
- In case of some industrial waste, this treatment is sensitive.
- Lastly, it requires Skilled Supervision.
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