While waste sludge from ...

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While waste sludge from another aerobic treatment plant is the best, cow dung is a good second choice. Cow dung has a lot of fibrous materials which can cause problems in pumping etc. Hence, it is advisable to make a slurry and pass the slurry through a strainer placed above the addition point in the aeration tank.

Cow Dung will contribute to COD / BOD. I expect the Biomass in the cow-dung to quickly adapt to the Vegetable oil wastewater. However, it will take at least 7 days, if not  15, for the bacteria to grow to desired MLSS levels.