Removal performance and optimization of particulate matter from the waste gas treatment system using water scrubber in livestock and poultry houses

Objective  A large amount of particulate matter, absorbed odor components and microorganisms discharged from livestock and poultry houses will cause serious damage to the atmospheric environment and health of surrounding person. Reducing the concentration of particulate matter in emissions is one of the core objectives of the emission purification technology at the end of livestock and poultry houses.

Method  This paper focused on the particulate matter removal performance of the horizontal water spray purification technology at the end of livestock and poultry houses. An orthogonal test scheme was designed and carried out on a self-built horizontal water spray system particle purification efficiency test platform. The range analysis and variance analysis methods were employed to analyze the influence of key control parameters such as ventilation air speed, nozzle pressure, nozzle rated orifice diameter and nozzle atomization angle on the purification efficiency of PM2.5 and PM10 particles, and the optimal control parameter combination for different particle size was obtained using a parameter optimization model.

Result  The results showed that the order of the control parameters affecting PM2.5 purification efficiency was nozzle pressure>ventilation air speed>nozzle rated orifice diameter>nozzle atomization angle; And the order of the control parameters affecting PM10 purification efficiency was nozzle pressure>nozzle rated orifice diameter>nozzle atomization angle>ventilation air speed. According to the optimized solution, the optimal control parameter combination was that the ventilation speed was 1.5 m/s, the nozzle pressure was 60 kPa, the rated nozzle orifice diameter was 11.1 mm, and the nozzle atomization angle was 120°. The results of validation test showed that the purification efficiencies of PM10 and and PM2.5 of the optimal control parameter combination were 40.4% and 41.1% respectively.

Conclusion  The findings can provide a reference for the design and operation parameter regulation of particulate matter purification equipment at the end of livestock and poultry houses.