A grill restaurant in Kaohsiung had a strong greasy smell at its exhaust outlet, drew a neighbor complaint, and came to us. Even though it is all called 'fume removal,' the market offers three completely different lines of thinking, each with its strengths and each with its blind spots. There really is no single best solution; it depends on your fume load, budget, and maintenance manpower. Let's lay out the three methods clearly first, then come back to how that grill restaurant finally chose.
Electrostatic Precipitator
An electrostatic precipitator uses a high-voltage field to charge the fume particles, which are then attracted to collector plates. It works well on particulate fume, has low airflow resistance, and produces no wastewater—an efficient move when you need to handle the 'grease you can see.'
But its worst enemy is no one cleaning it. Once the collector plates cake up with grease, efficiency drops noticeably, and in bad cases the high voltage can arc. So the plates must be cleaned regularly, and that labor has to be factored in. It is also of limited help against gaseous odor—it can catch the fume, but not necessarily remove the smell.
Wet Scrubbing
Wet scrubbing uses a water mist to intercept fume particles. It is simple in structure, effective on large particles, and not prone to arcing. The downside is that it produces oily wastewater that has to be collected and treated, and it is of limited effect on fine particles and gaseous odor. On top of that, the water quality, nozzles, and circulation pump all need maintenance; left unattended, it readily breeds odor and clogs up.
UV Photolysis
UV photolysis uses low-pressure UV lamps that emit at 185 and 254 nanometers. According to published data, 185nm is extremely high in energy and helps break the chemical bonds of grease and VOCs, generating ozone and hydroxyl radicals from the oxygen in the air, while 254nm helps break down grease and odor molecules. Its strength is in gaseous odor and fine fume, with no wastewater, low running cost, and a compact footprint. Note that lamp life degrades and the tubes need periodic replacement, and that the ozone must be controlled—there has to be enough of it to be effective, but it must not leak into occupied areas.
How to Choose
To boil it down: for heavy particulate fume, make an electrostatic precipitator or wet scrubber the workhorse and capture the grease first; for odor and fine fume, reinforce with UV photolysis. That is why many sites actually run a staged combination—grease removal up front, odor removal at the back. That grill restaurant's problem was mainly 'smell' rather than a large volume of heavy grease, so we made UV photolysis the core and added a filter in front to catch the large particles. The investment was modest, there was no need to wash collector plates every day, and the neighbor complaints were resolved.
TingHao is based in Nanzi, Kaohsiung, serving Kaohsiung, Tainan, Pingtung, and southern Taiwan, and can plan around your kitchen type, fume load, and maintenance conditions. Feel free to send site photos over LINE for an assessment.