Jeff Tolan is Chair.

Dave Thireault will give presentation re: characterization of brownstock filtrate.

The Environmental Subcommittee plans to organize the Fall Meeting Technical Session. The session will consist of a roundtable discussion re: provincial bleach effluent regulations and practices to meet them. Paul Herar has volunteered to represent BC and Tina Larsen AB. The Subcommitte still needs representatives from Ontario, Quebec and New Brunswick. Please see Jeff to volunteer. Dave Willis and Jean Bouchard will help Jeff find panel members for ON and QC. Other speakers include potentially Kirsten Vice of CPPA, (Calvin Hastings has contacted her); Patrick Bryant of Eka Chemicals and Terry Collins of Carnegie Mellon University.

Jim Collins brought Ontario survey form for mills. Target of 0 AOX for 2002. Current mill equipment survey to assess what equipment and costs would be associated with meeting 0 AOX.

The Subcommittee did have a project re: a list of toxic compounds prepared by WCB. This project has been let go since it seems to have been mill specific to HSPP.

Jeff asked the question: Who has completed ISO 14000? Answer: 7 mills completed. 7 in process. 2 committed but not started. 2 not committed to it yet.

Other information concerning his mill:

Pope & Talbot, Halsey. 500 tpd market pulp mill. 3 M & D digesters. Doug. fir chips or sawdust. Different furnishes campaigns 1 to 5 days. 50% Hem. 50% DF. 40% chip and 60% sawdust. 3 M & D digesters common blow tank one fibreline. After decker go to O2 reactor treat pulp med. consist. for one hour. Two wash presses in series. Impact on BSW has on rest mill – Bleach Plant, (COD, saltcake), Effluent, (COD, colour, BOD5) and Recovery, (saltcake loss or BL solids). Sampled : 3^rd washer, decker, first press and second press – filtrate tanks: COD, BL ,solids, colour, and conductivity. Bleach sequence is: M(Monox-L) Eop M P with 87 ISO.

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Dan Davies is Chair of this Subcommittee. 9 members + 1 attended his meeting – 6 of them are mill members.

Recapped prior activities and decided against closing out the Subcommittee. Felt the following items should be pursued:

• must continue to promote the use of the Protocol
• education. Continue to provide copies of the booklet to Institutions. Gary Berndt sent 80 copies marked with names of sponsoring vendors. He will supply the group with a list of the Institutions where the Protocol was sent. The suggestion is that we continue this practice of sending Protocols to Institutions. The Subcommittee will review what has been done and will see if more should be sent. The Subcommittee will update the Protocol Presentation paper and supply a copy to Institutions as well as offer to present the paper.
• TAPPI. Group wants to continue discussing with TAPPI to see if they will adopt our Protocol. (Dennis Owen did try to get TAPPI to adopt our Protocol at the June 1998 International Bleach Conference without success. Additionally, now the Swedish have adopted TAPPI Protocol making it even less likely that ours will become the standard.)
• Jean Bouchard has volunteered to produce a list displaying the English and French terms side by side. This list will be posted on our Website in both Word and Text formats.
• Rae Cunnington will confirm that our Protocol was taught at the last bleaching course and that make sure it is taught at future courses.
• Rae Cunnington will check with Doug MacKenzie re: whether the Protocol could be reviewed at the Breakfast session during the 2000 International Bleach Conference.
• Paul Herar has volunteered to keep list of new terms to be added to the Glossary for the next update.

Rae Cunnington is Chair of this Subcommittee. His report as follows:

1. Reviewed the liaison report from the Professional Development Committee which I will be submitting at the business meeting this afternoon.
2. A full week long Pulp Bleaching Course, leader Norm Liebergott, will be held October 3 to 8, 1999 in Thunder Bay, ON. Our committee needs to get the word out.
3. Comments were made that PAPTAC needs to be better at publicizing this course. Rae will approach PAPTAC. Maybe Pulp & Paper Canada magazine ad?

 

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c. Teaching Bleaching, ctd.

4. There was a one day short course held at PACWEST last week on pulp washing and pulp quality. About 17 people attended and it was judged to be successful by the participants. It included presentations on bleach washers.
5. PAPTAC has asked if our Committee is willing to sponsor a full Pulp Bleaching Course in 2001. The answer is, "yes". The preferred location is Western Canada, perhaps Kamloops. There needs to be emphasis that participants will be doing homework in the evenings. This may help in getting approval to attend.
6. There is much interest in one to two day short courses. It was suggested that tagging them onto PACWEST may not attract the audience we want to reach. Preferred locations would be: at a mill; near a grouping of mills, e.g. Prince George; Grande Prairie; Thunder Bay, Miramichi; at a branch meeting. Suggested topics included: Do stage; control strategy; series of short courses based upon the "red" book.
7. The Subcommittee was asked whether the Pulp Washing and Pulp Quality course should be done again. Our answer is, "yes".
8. We talked about "distance education", e.g. for short courses or several sessions for a longer course. There was general interest in this approach.
9. For the Spring 2000 meeting a technical session topic was proposed as "Process Control of the D Eop Stages". The format would be similar to yesterday’s session with round table and interactive session.

Chris Kanters is Chair. I didn’t have his overheads when completing the minutes. He may add more information to this section when the minutes are posted on our WebSite – so please have a look. The notes I took are as follows:

Will do Chlorate safehandling today. O2 for Fall 1999 Tom Mullen. Spring 2000 peroxide by Stan Heimberger. Fall 2000 Methanol – Van Waters and Rogers.

3 Safety Incidents reported:

Few weeks ago. Chlorate/methanol feed to gen. – explosion. Op. error? High conc. acid in gen. – had left chlorate filter drain open. Tried to start gen. Finally saw valve open. Fed chlorate/methanol to gen. Decided to dump since chemistry off. Shutdown. Acid got through to gen. and caused explosion. Dennis Owen has full Accident Investigaton report.

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Last Fall. All critical services on gen. run off turbo gen. Pump and PLC for that area. Two power bumps tripped power – absorption pump stopped and anti siphon valve failed closed. Siphoned back ClO2 storage tanks for 20 minutes – filled containment area. Now valve is set to fail open.

Gen. pressure indicator. Pressure tap plugged and indication was 112 and set point is 110 caused makeup valve to close off to drop vac. down. Air makeup continued to close whereas normal position is 75% open. Op. not able to ID problem no ClO2 made. Purge pressure tap was conclusion.

Other incidents? Rupture on Tower 30, Marathon submitted. Have incidents posted on WebSite.

Decided not to close High Kappa Pulping & O2 Delig. and how best get yield and bleachability. Gord Homer to chair group along with Brian Roy and Chris Kanters.

ECF Best Practices. Complete just decide how to disseminate.

New Projects. Scale and chem. removal and prevention in Bleach Plant, e.g. barium sulfate, etc. Team led by Doug Reid, with Stan Heimberger, Jim Oei and Irene Yaraskavitch.

Other project. Benefits of mag. sulfate addition to O2 delig. and bleaching. Lance Anderson, (Canfor), Brian Roy, (lead), Jim Collins and Doug Reid.

Nancy Van Allen gave sodium chlorate safehandling presentation.

Carlo Dal Monte filled in for Murray Walters as Chair.

Status of existing projects as follows:

1. Mini-O2 conditions. Dropped – the mills with min-O2 did not see value in further pursuit.
2. ClO2 generator optimization/safety. Dennis Owen to present work.

 

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e. Bleaching Equipment, ctd.

3. Review of consistency/flow measurement instrumentation. Ralph Lunn is leading with Don McCabe, Al Hizroth, Stuart Scott and Jim Menard assisting. Process Control Committee contacted and email from John Ball reviewed: no work has been done on this subject by their group.
4. MC equipment survey. Jim Menard has developed survey, plans to review results at the Fall meeting.
5. ClO2 heat exchanger survey. Jim Hopmans has presented a users list of sites using ClO2 heat exchangers as shown below. No further work will be done on this project.
6. ClO2 storage tank floating roofs. Generated a great deal of discussion. In short, Jim Hopmans, said that Sterling has discontinued development of floating roofs. There are significant costs associated with managing the risks associated with storing 12+ gpl ClO2. Basically, you have to design the tank as if the floating roof was not there. Moreover, if you look at the whole tail gas system – including the vent scrubber – the net $ impact of floating roofs is quite small. There are a lot of issues surrounding existing installations including: tank maintenance requires destruction/removal of the floating roof; Thunder Bay experienced scoring of their FRP tanks due the ice that formed on top of the floating lids in the winter; some mills have experienced sinking roofs; and what are the risks associated with a ClO2 spill at 10 gpl vs 12 vs 14? In short, no one is planning or installing them and people will be removing them as required.
7. Literature survey – measurement of Bleach Plant washing efficiency. Doug Reid will present findings today. Mike Tower will be presenting a paper on this subject in the near future. No further work is planned.

Other business:

1. Good attendance.
2. Dennis Owen will be presenting work today on the Bleach Plant Scrubber Survey as well as the R-8 optmization work.

New business:

The following project will be undertaken:

8. FRP reliability and PM. Dennis Owen, Stuart Scott, Brian Card, John Brazil, Carlo Dal Monte. Purpose: Develop guidelines for evaluating FRP, (if possible), or establishing schedules for inspection/repair/replacement of FRP components, (pipes, tanks, washer vats, washer drums). Sources of information: CSA; ASME; other mills; Sterling, (FSE? info.).

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Doug summarized work. His PowerPoint presentation is attached to the email containing the minutes and is entitled "bpwash.ppt"

Summer 1995 from 24 mills or 29 Bleach Plants plus two US mills or + 3 Plants.

Chem. demand in following stage most popular in both acid and alkaline stage followed by no measurements! COD next but more on acid than alkaline. Mat consistency, mat pH, fibre in filtrate, TDS, etc. Not a lot of measurement – just looking at op. of BP to see if problem.

It was asked – what should be measured?

Whatever is going to affect next stage.

ICP of 11 diff. metals.

pH and Kappa # of filtrate.

Dissolved solids, conductivity, chlorides, (IMPCO).

Other Comments:

Good washing may not be critical on all stages, e.g. first two are very important, maybe not so much rest.

Parameters used for EKA Washer studies:

Acid Washers. pH titration. caustic digestion.

Alkaline pH and COD.

Displacement ratio.

Mike Towers will be following up with another paper on Washer Efficiencies.

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23 mills reported on Scrubbers. 12 Turbotacs and 11 packed scrubbers. Several new Turbotac. No changes in Fed. or Prov. regs. No maritimes or Quebec regs. Tower residuals lower since last survey. Ave. 247 kg/day to max. 1800 kg/day Cl2 going to scrubbers per day. 247 to 1115 kg/day ClO2/day going to scrubber per day. EPA guidelines ask for 99% recovery 2001. Majority less than 90%. WL or weakwash and Eop liquor used as scrubbing liquor. Wants to get costs. 7 use WL and 2 use SO2 - get rest from Dennis re: numbers. Packing coating and precipitation problems. Turbotac need acid washing. Comment re:Turbotac scrubber, entrainment.

15 mills on 17 gens.

No puffs per year and up to 3 puffs per year.

Gen. problem contaminants in chems. and water.

High pressure kickouts in vac. gens.

Whiteouts in R-8 and R-10’s in several mills few times per month.

Annual to monthly s/d’s.

1% yield loss $250 k per year in 15 or 20 tpd gen.

Knowledge of chem. specs. poor.

Hot water tank is source of some of the most contaminated water in mill.

Gen. targets had range that was significant.

Jean Bouchard is Chair. Jeff Tolan, Tina Larsen, Paul Herar and Dan Davies attended.

Minutes as follows:

1. We are proposing the creation of the Howard Rapson Memorial Award. Got OK from family in January. Bleach Cttee. award to be presented for bleaching session paper presented at PAPTAC Annual Meeting. First award to be awarded at the 2001 Annual Meeting.
2. We are planning the Annual Meeting. 2 general sessions. 1 session including round table on Environmental Impact of ECF Bleaching. Jeff Tolan is responsible.

 

 

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f. Annual Meeting

3. We will continue to provide speakers with gifts. Dan Davies is responsible.
4. Deadline for abstracts. Annual Meeting, July 15^th, provide abstract to Jean Bouchard. IPBC, (International Pulp Bleaching Conference), June 30^th, provide abstract to Richard Berry.

Chris Kanters is Chair. I didn’t have his overheads when completing the minutes. He may add more information to this section when the minutes are posted on our WebSite – so please have a look. The notes I took are as follows:

59 members with email.

Date, Location and Agenda for Future Bleach Meetings. Agenda etc. will be on site at least one month before meeting.

Search engine will take you to point in previous meeting minutes. Operational now.

New discussion. Ask the Industry Experts. Will not do due to liability and one person’s opinion.

Recognition of Suppliers on WebSite.

French version of WebSite? Chris cannot do. Chris to talk to PAPTAC to see if they can at least translate public part.

Technical Info. Sheets. Individuals did volunteer to Canadianize sheets made up for TAPPI for chlorate, caustic, etc.