WEF Discussion Forums : Operation and Maintenance : floating sludge problem

 

Hi

We have air extended plant, suddenly begin to appear a floating sludge at aeration and settlement tanks. The appearance of this sludge look like a clod of earth with a gelatinous consistency, and appear in a regular hour.

The oxygen in aeration tanks is ok.

 

Any clue about what could cause this.

 

 
]]> Thu, 22 Apr 2010 03:19:24 GMT Best guess based on limited info is denitrified sludge. Check your air levels with another probe. If you can (depending on effluent requirements), increase the recirculation from your clarifiers. Another thing I found helpful was to reduce/stop the mixed liqour recirc flow to the anoxic selector. You may want to check your current flows vs. design flows too see if low flows are causing a long retention time in your basins. Good luck!


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