Waste liquid processing method and waste liquid processing apparatus using the same

A waste liquid processing apparatus comprising:

• a separator where a chlorine-based organic solvent contained in a waste liquid is separated;
• a first vaporizer, which is connected to the separator, having functions that include vaporization of the chlorine-based organic solvent remaining in the waste liquid after a solvent separation process performed by the separator;
• a collector, which is connected to the separator via a second vaporization gas supply line, having water for trapping, in the water, water-soluble substances contained in the waste liquid after being vaporized in a first vaporization process by the first vaporizer,
• a second vaporizer, which is connected to the first vaporizer via a first waste liquid supply line and a first vaporization gas supply line, for vaporizing the chlorine-based organic solvent remaining in the waste liquid after the first vaporization process and a collection process by the collector;
• a photo-oxidative decomposer, which is connected to the collector via a third vaporization gas supply line, where photo-oxidation is used to decompose;
• a chlorine-based organic gas generated in the first vaporization process and subjected to the collection process;
• and
• a chlorine-based organic gas generated in a second vaporization process by the second vaporizer;
• a post-treatment processor, which is connected to the photo-oxidative decomposer via a decomposition product gas supply line, for carrying out adsorption, absorption, and neutralization of a decomposition product gas generated in a photo-oxidative decomposition process by the photo-oxidative decomposer;
• and
• a control section that has a sequencer for controlling the waste liquid processing apparatus.