Explosions Due to Hydrogen and Hydrogen Sulfide Build-up

As paper mills have begun to close up their water systems and move toward zero effluent discharge, they are finding that closing a mill’s water system can lead to changes in a mill’s water chemistry. These can include a build-up of nutrients which can increase the amount of microbes in a mill’s system. In the absence of oxygen that might be found in tanks, chests, and pipes, anaerobic bacteria can thrive.

When certain types of anaerobic bacteria break down the organic material found in a mill, hydrogen sulfide and hydrogen gases can be formed and released. One group of anaerobic bacteria, sulfate-reducing bacteria or SRB, produce hydrogen sulfide gas as a byproduct of their metabolic process. Other anaerobic bacteria, including clostridia, produce hydrogen gas as a byproduct of their metabolic processes.

Both these gases, if present in sufficient amounts, can be a safety concern — particularly for explosions — in a paper mill. Monitoring for these gases can help detect harmful levels of the gases before incident occurs.

RPTA issued Technical Bulletin 16, Hydrogen and Hydrogen Sulfide Gases, which provides guidance on monitoring for these gases.

The U.S. Chemical Safety Board issued a Bulletin that provides guidance on hot work in such areas.


UPCOMING EVENTS

2018 Industry Profile Study
Registration for the 2018 RPTA Industry Profile Study, the annual physical properties benchmarking study is underway. RPTA members who plan to register can find information on the 2018 study including the registration form here.

2018 Production-Technical Seminar
The 2018 RPTA Production Technical Seminar will be co-located with TAPPI's PaperCon in 2018. The 2018 conference will be held in Charlotte, NC the RPTA sessions taking place on April 16-17, 2018. More information on this event can be found here