Under normal conditions, the major odor pollutants come from alkali waste treatment unit, sour water stripping unit, ammonia refining unit, sulfur recovery unit as well as waste water treatment site.

The alkaline residue treatment unit becomes main odor source of refineries, so it has to be improved.

At noon he ate dumplings, leek stuffing fat, bun, when he ate a whole head of garlic, and now came from the mouth of a Unit, dumplings mixed with garlic, smoked odor.