A novel pilot-scale installation integrated of improved sieve-tray tower and wet electrostatic precipitator for paint mist removal

Figures & data

Figure 1. Spraying exhaust paint spray treatment device. 1. Wet electrostatic precipitator. 2. Sieve-tray tower. 3. Spraying unit. 4. Sieve trays unit. 5. Rotameter. 6 Water pump. 7. Sampling points

Figure 2. ST-WEP device test scene diagrams: (a) the front view, and (b) the back view

Figure 3. The side view of the ST-WEP

Figure 4. Effect of different pressures on spray particle size distribution under different paint types: (a) water-based paint, and (b) oil-based paint

Figure 5. Particle size distribution of paint spray under 0.4 MPa pressure: (a) volume distribution, and (b) quantity distribution

Table 1. Category, Henry’s law constant for water as solvent of main VOCs detected during paint spray process

BTEX	Molecular formula	Henry’s law constant (mol m^−3 Pa^−1)	OVOCs	Molecular formula	Henry’s law constant (mol m^−3 Pa^−1)
Toluene	C7H8	1.5 × 10^−3	Ethyl acetate	C4H8O2	1.1 × 10^−1
Ethylbenzene	C8H10	1.3 × 10^−3	Butyl acetate	C6H12O2	3.5 × 10^−2
m-p-xylene	C8H10	1.4 × 10^−3
o-xylene	C8H10	2.0 × 10^−3

Figure 6. Concentrations of BTEX and OVOCs emitted during paint spray process

Figure 7. Particles removal in paint mist as a function of time: (a) integrated setup and sieve-tray tower unit, and (b) particle concentration at the inlet and outlet of wet electrostatic precipitator unit

Figure 8. Removal of VOCs by integrated setup: (a) OVOCs, and (b) BTEX

Figure 9. The chemical oxygen demand (COD) of wastewater as a function of time