Wastewater and assets management specialist
+84 776900780
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Fish industry

Pre treatment

✔️ Fiber is normally not present
✔️ Very homogeneous wastewater gives few bacteria
✔️ Inorganically particles missing in most cases
✔️ Too little or too much carbon (COD) in a period there is a big variation
✔️ Phosphorus and nitrogen can both be too much or too little
✔️ Much nitrogen demands calcium (lime)

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Fish industry

Mass balance for the waste water treatment plant

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Fish industry

Problems with overload of dissolved COD

Oxygen below 0 0,3 mg/l, gives

✔️ lots of filamentous bacteria (Thiotrix, Mycolata)
✔️ foam
✔️ sludge in the outlet (loss of biomass)

What to do?

✔️ Dosing of chlorine

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Fish industry

Red cells are dead green are still alive

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Fish industry

Before and after dosing chlorine

Before week 14

After week 30

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Fish industry

Today’s situation

Today the problem is back again

– 2 times a week a vacuum truck removes foam

– Foam is blowing around in the neighborhood

– The customer is desperate, we will try THPS soon.

 

Lots of food industry have problems with foam and filaments bacteria: Milk, Brewery, Poultry

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