Hydrodesulfurization is a more complex method of removing sulfur from fuels.

Hydrotreating may also be employed to remove sulfur and reduce the level of nitrogen.

Operating circumstances refers to scrubbers, which remove sulfur effectively but sometimes break down.

These plants would be required to use "scrubbers," special equipment on smokestacks that removes sulfur by a chemical reaction.

They might switch to low-sulfur coal or try new technologies that remove sulfur without scrubbers.

Because of recent changes in fuel quality regulations, additional refining is required to remove sulfur, which contributes to a sometimes higher cost.

The Stretford process has also been used to remove sulfur from fuel.

The reductions could be made by installing devices on smokestacks to remove sulfur.

Sure enough, they found them to be highly effective in removing sulfur.

He found one in a method for using microorganisms to remove sulfur from coal and oil.