Dust is removed from the airstream of a municipal incinerator by four dust colle

Question

Dust is removed from the airstream of a municipal incinerator by four dust collectors operating in parallel, each handling 1/4 of the total airflow of 200 m3/min. The airstream contains 10 g/m3 of suspended solids. The collector efficiency is 98%, decreasing linearly to 74% as air flow is doubled. If the maximum permissible solids concentration from the combined stack discharge [all 200 m3/min] is 1.0 g/m3, can one collector be temporarily taken out of service by: (a) overloading the other 3 units [i.e., each of the three handling 1/3 of the total flow], or (b) by not treating 1/4 of the airflow [i.e., mixing 150 m3/min of treated air with 50 m3/min of untreated air]?

Explanation / Answer

Yes, one collector can be temporarily taken out of service by overloading the other 3 units and

No, one collector can't be temporarily taken out of service by not treating 1/4 of the airflow.

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