ESPs are used in combination with a number of other air pollution control (APC) devices
including wet scrubbers and dry scrubbers (also called spray dryer absorbers) to clean the flue
gas generated by burning hazardous wastes. Some facilities have been designed to use spray
dryers to remove the acid gases including HCl, HF, and SO2 followed by the ESP to remove
the acid gas reaction salts, any unused sorbent, and particulate matter. Other facilities have
been designed with an APC system consisting of a spray dryer, baghouse, wet scrubber, and a
wet ESP (Figure). The spray dryer cools the flue gas and reduces some of the acid gas
components. The baghouse collects the particulate matter (including metals) and the wet
scrubber removes HCl (> 99%) and other acid gases. The wet ESP collects any particulate
matter not removed by the baghouse. The wet scrubbing system is a closed loop. The effluent
produced in the scrubbers is ultimately sent to the spray dryer to evaporate the liquid, therefore eliminating the need for a waste water treatment system. A number of facilities using this APC
system configuration are permitted to burn PCBs and other Toxic Substance Control Act
(TSCA) and Resource Conservation and Recovery Act (RCRA) wastes.
including wet scrubbers and dry scrubbers (also called spray dryer absorbers) to clean the flue
gas generated by burning hazardous wastes. Some facilities have been designed to use spray
dryers to remove the acid gases including HCl, HF, and SO2 followed by the ESP to remove
the acid gas reaction salts, any unused sorbent, and particulate matter. Other facilities have
been designed with an APC system consisting of a spray dryer, baghouse, wet scrubber, and a
wet ESP (Figure). The spray dryer cools the flue gas and reduces some of the acid gas
components. The baghouse collects the particulate matter (including metals) and the wet
scrubber removes HCl (> 99%) and other acid gases. The wet ESP collects any particulate
matter not removed by the baghouse. The wet scrubbing system is a closed loop. The effluent
produced in the scrubbers is ultimately sent to the spray dryer to evaporate the liquid, therefore eliminating the need for a waste water treatment system. A number of facilities using this APC
system configuration are permitted to burn PCBs and other Toxic Substance Control Act
(TSCA) and Resource Conservation and Recovery Act (RCRA) wastes.
APC system for a hazardous waste incinerator consisting of a
spray dryer, baghouse, wet scrubbers, and wet ESPs
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