Quality of wastewater from catalytic cracking flue gas desulfurization

In the flue gas desulfurization process of catalytic cracking, sulfides mainly originate from hydrogen sulfide (H2S) present in the feed oil. In a catalytic cracking unit, the feed oil undergoes cracking reactions under high temperature and pressure, producing a range of hydrocarbon compounds; simultaneously, a small amount of hydrogen sulfide is also generated. This hydrogen sulfide will enter the desulfurization system along with the flue gas. The treatment of the wastewater generated from catalytic cracking flue gas desulfurization is mainly carried out using wet desulfurization methods. During the desulfurization process, the flue gas comes into contact with a desulfurization liquid containing oxidants, causing the sulfides to be oxidized into sulfate ions (SO42-). Then, sulfate ions are removed from the desulfurization liquid through processes such as precipitation and filtration, resulting in wastewater that meets the emission standards. It should be noted that the treatment process of the wastewater resulting from flue gas desulfurization in catalytic cracking units must be carried out in strict accordance with relevant environmental protection regulations, in order to ensure that the quality of the discharged water meets national and local emission standards and to reduce environmental pollution. .

Sulfide issues in wastewater from flue gas desulfurization https://bbs.hcbbs.com/thread-3213647-1-1.html (Source: Haichuan Chemical Industry Forum)

Hello, this post also doesn’t explain the source of the sulfides. Does this marine enthusiast have any suggestions?