Does Adding Cow Feces Increase COD?

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Does adding cow dung for the purpose of increasing MLSS increase the COD in a conventional Activated sludge process ETP, of the vegetable oil industry?

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9 Answers

  1. Yes that is true, the more you add cows dung into the process is the more you increase nutrient. The treatment process it won't comply with regulation.

     

  2. Yes that is true, the more you add cows dung into the process is the more you increase nutrient. The treatment process it won't comply with regulation.

     

  3. 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.

  5. Hi There,

    While the dung will increase  C od the BOD present may not be suitable due to the cows singular diet, and the cellulose content. IF you are specifically requiring readily available carbon, I suggest a substitute like acetic acid, or a waste product from another industry like molasses or ethanol. For bacterial biomass, I agree with Ian Pearson. Try waste sludge from another treatment plant.

  6. Right idea. Wrong inoculant. For oil, grease, and any other organic compound add the Archaea microbes. Been around for 40 years and still works 100% of the time. For a short video on you tube look up Mega Borg Oil Spill.  Extremely inexpensive. Natural microbe with no processing.

  7. MLSS is made up chiefly of microorganisms so adding cow dung may result in an increase in MLSS if the microorganisms can quickly adapt to this type of food source and multiply effectively.  However this may not be what you want if the microorganisms that multiply are not the ones that are specifically suited to the wastes from the vegetable oil industry you are trying to treat.  Rather try to find another similar industry where they are treating their wastes and collect some of their waste sludge.