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What Is The Sludge Index
- Jun 22, 2018 -

What is the sludge index


What is this chlorination?


When the organic matter in the water is mainly ammonia and nitride, the actual amount of chlorine required is met, the amount of chlorine increases, and the amount of residual chlorine increases, but the latter slowly grows. After a certain period of time, the amount of chlorine increases, and the amount of residual chlorine drops instead. The amount of chlorine added increased, and the amount of residual chlorine rose again. After this breakpoint, the residual free chlorine appeared, and the chlorination continued to work best, ie, chlorination at the breakpoint.


What are the systems of activated sludge?


The activated sludge process consists of an aeration tank, sedimentation tank, sludge return, and excess sludge removal system.


What is sludge settlement ratio?


Sludge sedimentation ratio (SV%): refers to the aeration tank mixture, standing in a 1000ml graduated cylinder for 30min, and the volumetric ratio (%) of the precipitated sludge to the mixture.


What is the sludge index?


Sludge Index (SVI): refers to the volume of each gram of dry sludge after the mixed solution at the outlet of the aeration tank is settled for 30 minutes, measured in mL.

The SVI value is too low, indicating that the mud is fine and dense, with many inorganic substances, lack of activity and adsorption capacity; SVI value is too high, indicating that the sludge is difficult to sedimentation and separation, is about to expand or has been expanded, the cause must be ascertained, and measures must be taken.


What is sludge swell, disintegration, decay, floatation and foam?


Sludge swelling: When the sludge is degraded, the sludge is not easy to precipitate, the SVI value is increased, the structure of the sludge is loose, the volume expands, the moisture content increases, there is less clarification fluid, and the color also varies.

Sludge disintegration: The muddy water in the treated water, the turbidity of the sludge, and the deterioration of the treatment effect are the phenomena of sludge disintegration.

Decomposition of sludge: In the secondary sedimentation tank, anaerobic fermentation may occur due to the long-term retention of sludge, and gas may be generated, thereby causing the phenomenon of bulk sludge floating.

Sludge floating: Sludge floating in the secondary sedimentation pond.

Foam problem: Foaming in the aeration tank, mainly due to the presence of large amounts of synthetic washing or other foaming substances in the sewage.