A researcher from Chulalongkorn University’s Institute for Environmental Research has made it possible to transform used vegetable oil into potassium liquid soap that cleanses effectively, is water soluble, 100% biodegradable, and safe for the wastewater treatment system.

The authorities confirmed that the number of workers who allegedly succumbed on Monday to hydrogen-sulfide poisoning at a rubber-latex factory in Songkhla’s Sadao district stands at three. The officials revealed the results of a test that showed the level of hydrogen sulfide inside the underground waste-water treatment system was more than 200 particles per metre (ppm), enough to knock someone unconscious and prove fatal from prolonged exposure.