How to deal with sulfides in water
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In refinery catalytic units and desulfurization units, the wastewater generated contains high levels of sulfides and ammonia nitrogen (with a concentration of 10,000 mg/Nm3 for ammonia nitrogen and 2,000 mg/Nm3 for sulfides). Are there any effective methods for treating this wastewater? Thank you
Is there no desulfurization device? Generally, sulfates will precipitate, right?
Add ferrous sulfate to precipitate it! ! That’s fine, under neutral to alkaline conditions! !
Desulfurization is required, or it’s ammonia-nitrogen wastewater; using polyaluminum chloride and polyacrylamide yields good results
What are the components of the wastewater? I can give it a try
Zero wastewater discharge process solution, qq963973833
After adding chemicals to reduce hydrogen sulfide and ammonia nitrogen, it can be used directly as circulating water.
The desulfurization wastewater from refineries is also known as acidic water, and it contains very high concentrations of ammonia and hydrogen sulfide. This acidic water is generally recovered by stripping to remove ammonia and hydrogen sulfide, and the water resulting from this process can be used as feedwater for electrodialysis or as makeup water for circulating water systems. The recovered hydrogen sulfide is sent to the sulfur recovery unit, while the recovered ammonia is used as supplementary ammonia for water and ammonia injection in the unit. Some marine enthusiasts had better first understand sulfur-containing wastewater from refineries (especially since the original poster has clearly specified that it is wastewater containing ammonia and hydrogen sulfide from the desulfurization units of catalytic cracking units); there’s no need to use terms like \"precipitation by adding ferrous sulfate\" or \"formation of sulfate precipitates\" – such are amateurish expressions.
Why is this done? Do you know how much alkali and how much ferrous sulfate this will consume? In what kind of refineries have you seen or heard of sulfur- and ammonia-containing wastewater being treated using the method you mentioned? Acidic water treatment involves stripping to recover hydrogen sulfide and ammonia.