Hydrogen Sulfide in Wastewater Generated by Hydrogen Induced Cracking Test: Cause and Safety Measures

During the process of treating various wastewater, toxic gas such as hydrogen sulfide is generated due to the chemical reaction among unknown chemicals contained in wastewater, causing an accident that kills or injures workers and requires evacuation of people in neighboring areas. This study tested the reaction of sodium hydrogen sulfide generated during hydrogen induced cracking with sulfuric acid to confirm the occurrence of hydrogen sulphide and proposed safety countermeasures to prevent similar disasters from recurring. Hydrogen sulphide gas used during the process of hydrogen organic crack test reacts with sodium hydroxide in a neutralization tank and a gas scrubber to produce sodium hydrogen sulphide. Highly toxic hydrogen sulphide gases are produced violently when wastewater containing sodium hydrogen sulfide is mixed with sulfuric acid wastewater. In order to prevent the occurrence of harmful gases due to adverse reactions during wastewater treatment, the process of generating consigned wastewater should be well identified in advance, along with the detailed information on the composition and properties of the wastewater. In addition, more attention should be paid to adverse reactions of mixed wastewater.