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When diluted water is added in surface wastewater to take immediate BOD is called unseeded and after 5 days of period wastewater received saturated oxygen from diluted water is called now seeded BOD.

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Seeded BOD involves adding a known quantity of acclimated microorganisms to the BOD sample to speed up the decomposition process. Unseeded BOD relies on the naturally occurring microorganisms in the sample to break down the organic matter, which can take longer compared to seeded BOD. Seeded BOD may provide a more accurate and consistent measure of the organic load in a sample, while unseeded BOD can be influenced by the initial microbial population present in the sample.

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Q: What are the differences between seeded and unseeded BOD?
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