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.
LATEST NEWS
Industry Benchmarking Survey
Sampling and sample preparation are complete for the 2025 Profile Study. Samples from 51 paper machines, collected during the first quarter, were blind-coded before shipping to test labs. Report will be issued in early September. All past Survey reports can be accessed at this member-only page.
2025 Winter Webinar
On January 22nd we held a webinar on Recovered Fiber Grades & Quality, presented by Shawn State, President of Pratt Recycling at Pratt Industries, and Pat McEnroe, Product Group Director at Kadant Black Clawson. The recording and Power Point slides from the webinar are available at this RPTA members only site, along with materials from other past RPTA educational events.
UPCOMING EVENTS
2025 Production-Technical Seminar
TAPPICon 2025 will be held May 4 – 7, 2025, at the Minneapolis Convention Center.
This year, RPTA’s Production-Technical Seminar will be integrated into TAPPICon.
RPTA members at mills that make 100% (or very high percentage) recycled containerboard, paperboard, or pulp (and their corporate support staff) will register through RPTA for a special, low registration fee of $800.
Included in the $800 fee are TAPPICon and four RPTA exclusive events for our members:
- End Chemistry Mini-Course – May 5, 7:00 to 9:00 am
- Member Lunch – May 5, 11:30 am to 1:00 pm
- Member Roundtable Breakfast- May 6, 7:45 to 8:45 am
- Member Networking Room – May 5 and 6, all day
RPTA Operating Board Officers will be chairing three TAPPICon sessions, with RPTA-recruited speakers, on topics of interest to our members:
- Safety Walk/Safety Talk
- Achieving the Right Amount of Strength
- Waste Reduction and Alternative Fuels