System for reducing atmospheric pollution generated in printing house, and operation method therefor

A system for reducing atmospheric pollution occurring in a printing facility including a plurality of printing devices (10), each of which has an air purifying module (11) and an exhaust hole (12) connected to the air purifying module, and which are located in a printing area (M), the system comprising:

• a particulate pollutant processor (100) communicating with an intake hole (20) located at the exhaust hole (12), and connected to the intake hole (20) through a first valve (V1);
• a gaseous pollutant preprocessor (200) connected to the particulate pollutant processor (100) through a second valve (V2);
• a high concentration processing filter unit (210) and a low concentration processing filter unit (220) connected to the gaseous pollutant preprocessor (200) through a third valve (V3);
• a fan (300) connected to the high concentration processing filter unit (210) and the low concentration processing filter unit (220), which converge;
• a first bypass passage (L1) connecting the second valve (V2) and the fan (300) to bypass the gaseous pollutant preprocessor (200), the high concentration processing filter unit (210), and the low concentration processing filter unit (220);
• a second bypass passage (L2) connecting the first valve (V1) and the gaseous pollutant preprocessor (200) to bypass the particulate pollutant processor (100);
• a first sensor (S1) located at each exhaust hole (12) to measure particulate pollution concentration and gaseous pollution concentration, and control the valves (V1, V2, V3);
• and
• a second sensor (S2) located outside the plurality of printing devices (10) within the printing area (M) to measure particulate pollution concentration and gaseous pollution concentration, and control the valves (V1, V2, V3).