Which of the following is not a type of reactor system used for microbial composting?

Which of the following is not a type of reactor system used for microbial composting? Correct Answer Field composting

Field composting and windrow composting is a type of non-reactor system of classification of the composting systems, whereas, rotating drum, horizontal reactor, vertical reactor is the three major type of reactor system used for microbial composting.
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A Composition of carbon dioxide, oxygen and nitrogen with mole ratio 1:2:5 with 4 moles of oxygen, enters a reactor with a flow rate of 100 kg/s, the ratio of rates of leaving the reactor of the three is 5:2:1, and 5 moles of nitrogen leaves the reactor, what is the total number of moles leaving the reactor?
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