- Currently commissioning a Moving Bed Bioreactor for treatment of D_o and E_op

stage effluents for BOD reduction.

- Completed a digester additive trial with ambiguous results.

- Continuing with ISO 14000.

- Groundwork finished for DCS upgrade in digester area and new digester.

- Will be rid of all PCB equipment by end of year.

- Kappa Factor Control in 2001.

- Buying BTG Kappa Analyser – hopefully operating by spring.

- Various projects for expansion to 580 MT/D.

- Including new 9^th Digester (batch).

- Pulp Machine upgrade.

- Rebuilding # 1 turbine.

- Installed controls for brown decker conductivity.

- Start to mix CTO into Bunker "C" – cost.

- Fast tracking work on ISO 14000.

- Get approval to replace SS tower to titanium and new peroxide system.

- To replace NaOH piping in Bleach Plant – material of construction.

- Kappa Factor Control.

- Operating at record production rates.

- Plan to run digester down flow low solids.

- Trialing larger chip size feed to digester.

- Lazy steam shower on press selection pulp machine.

- Late delivery on our new paper machine headbox so fall shutdown was deferred

to the spring.

- Running the digesters 18 months between cleaning, but should be OK.

- We are still on our program of speeding up our paper machine with the goal to

be running 500 paper and 350 pulp within a couple of years.

- We are evaluating polysulphide system.

- Beginning our 2 year Grande Prairie Optimisation Project (GPOP). Will increase

production by 10% and install 0₂ delig. (2 vessel) to address our new colour limits

for 2002 and lower yet in 2007.

- Will begin AQ pulping in mid November.

- Will be installing a Kappa Analyser and some kind of compensated kappa factor

control in June this year.

- Feasibility approval to investigate a co-generating plant on site.

- New batch digester and blow tank at Cornwall. Lowered cooking temperature by

10^oF, yield increased by 0.7% on wood (95% confidence).

- Increased consistency in D₁ stage from 7 – 8% to 10%, observed substantial

decrease in Cl0₂ usage (1 – 2 Kg/ton).

- PS/AQ at Espanola, evaluating it for other mills.

- Record production (October 99 – September 00) at 255,000 ADE.

- New wood waste boiler starting up November, 2000.

- Pulp machine upgrades during shutdown have seen increases in daily production.

- Engineering starting on replacing our NCG incinerator quencher with a caustic

quencher.

- Operated pulp mill all summer without NG PB.

- Have approval to do some form of BP control.

- Starting up new Ahlstrom pressure screening system on brown stock side on

Christmas shutdown.

- Ran an increased H₂0₂ trial on E₁ stage.

- Engineering study being done now for pressurised 0₂ stage.

- Repap has been sold to U.P.M. Kymene of Finland.

- New record production of 722 ADMT/Day.

- ISO 14001 audit – look for registration in November, 2000.

- Bob Ryan retired. Brian Dennis acting as interim Mill Manager.

- Taking market downtime – Sawdust line October 27 to December 4, and chips

line November 10 – 27.

- Completed a successful 14 day annual shutdown September 7 – 20.

- In process of installing new 0₂ reactor for 00 stage.

- Have been operating the mill on only 1 basin since June due to requirement

by MOE/Env. Canada to dredge # 2 basin due to high furan content of the

sludge.

- Kvaerner Chemetics liquor analyser on line.

- Foxboro advanced digester control package (almost) on line.

- 20% production increase on hold pending final sale to APP.

- Screen Room de-bottlenecking underway; new knotter installed, also Quaternary

planned. Using Wingams to evaluate.

- KF control not successful due to low frequency of samples (manual tests done

hourly).

- Down flow lo-solids trials.

- New on-line dirt scanner.

- Lazy steam shower.

- New steam hood (profiling).

- SAQ for softwood.

- Diamond roll screens.

- Kappa Factor Control for D_o stage.

- Planning to use sesquisulphate for D_o stage acidification – any suggestions for

what to do / not to do? FRP VS. Kynar, flashing.

- New corrudek drum on our E_o washer.

- Putting new top felt on 3^rd press pulp machine for extra 50 ADT/day.

- Installing flowmeter and valves on digester F11 nozzles (12).

- Mill bottleneck moves to Evaporators.

- New H₂0₂ controls on E_op – feedforward from D_o exit brightness.

- Chip thickness screening starting up in December.

- Phase 1 of our batch digester automation (capping valves and new DCS).

- Replacing D₂ diffuser screen.

- Using C0₂ instead of H₂ to unload S0₂ car.

- Bought by Canfor almost 1 year ago.

- Installed barrier screen with increased capacity on "B" mill.

- Installed a Valmet continuous sheet scanner on the # 2 machine.

- "B" digester is committed to "lo-solids" cooking.

- Good success from a Cl0₂ stack analyser following a bleach vent scrubber –

using it for feedback control. Will install 3 more monitors – Paragon.

- Filtrate extractors for pH measurement on all bleaching stages in both bleach

plants – both Kajaani and BTG.

- Permanent MgS0₄ system for mini 0₂ and E_op.

- Currently working on ISO 14001 certification.

- Currently installing a 2^nd BTG kappa analyser and a FTIR liquor analyser.

- Approved a dilute H₂S0₄ acid system to replace S0₂.

- Started up 2 new SVP-lite generators in late August – very pleased with the

results – we are now 100% ECF.

- We are now running a mini 0₂ delig. system in our B-mill, and although we are

not at full "designed" conditions, we have seen a $ 10 - $ 12./ADMT savings in

chemicals. A-mill in the next few months.

- New DCS system in B-mill – excellent opportunities to implement better

control strategies.

- Starting to pursue ISO 14000.

- Batch digester debottlenecking.

- Recovery Boiler DCS and economiser replacement.

- Pulp machine Fourdrinier upgrade.

- Conversion of flakt dryer to Daken large steam coils.

- Kamyr digester advanced control software (Foxboro).

- Getting ready for more SPF chips.

- For one of my customers – Alcel, Atholville. They implemented compensated

kappa factor control in May. Works fine in 6 months.

- Extended the life expectancy of the site’s acid storage once the tank met its

minimum thickness by using a low temperature coating material at 10% of

the cost of replacing the tank.

- Annual shutdown completed. No surprises! Annual production increased to

839 tons per day.

- Increasing pump size to brown screens for higher tonnage. Analyser installed

on Cl0₂ generator solution, but not on line as of today. Waiting for fibre optical

wire. Installed diagonal screens to digester upper extraction screens and will

complete next year.

- Phase 1 of Machine Room DCS complete (wet end).

- Investigating ozone bleaching at D₁ stage.

- Reducing bleaching costs is on-going concern.

- Modifying bleach plant and 6M screens for increased bleached paper production

and reduced market pulp production (spring 2001).

- New chip handling facility running as of March, 2000.

- Digester antiscalant trial for December-March on upper heaters.

- Planning pressure screens for 2001 on brown screens (not approved yet).

- Membership fees reduced by 27%.

- Research has been divided into 20 elements. Each element covering all the

aspects o/a topic.

- Membership fee splitting – 50% basic program, 35% allocated by the members

to element they judge as priority, and 15% member specific research and

troubleshooting.

4 trucks to assist with off-loading a rail tanker that had derailed, along with

several other chemical cars. It was not a DH car, but we were contacted as we

were the closest H₂0₂ producer.

Q. Has anyone tried using EKA operating conditions (chemical conc.) in Sterling

generator? We continue to have tube plugging problems. Looking to extend

life between tube cleanings.

R-8 responses quicker to operating changes than EKA.

Need to look at operating temperature (2^oF difference from EKA (161^oF) 7.ONA

and Sterling 163^oF 8.1N acid.

Need to look at desuperheater temperature.

Need to change all conditions not just chemical strengths.

As you push EKA generator they can plug up.

Several EKA generators have gone to Sterling conditions.

Q. How many mills add caustic for effluent neutralisation? And how much caustic

on a regular basis?

A. Howe Sound, Alpac, PG Pulp 2.5 lbs./ton, Irving 7 lbs./ton, and Powell River.

Q. Has anyone measured the Cl0₂ concentration in the vapour space of a D stage

upflow/downflow tower?

A. 500 ppm Gerry Pageau, 500 ppm Murray Walters.

Q. How many mills measuring their D stage tube residuals? Type of extractor,

automated(?), and if yes are they reliable?

Q Material of construction for NaOH piping in bleach plant, mild steel, stainless

steel, or else.

A. Canfor – mild steel, using Dubyis cleaning method.

Miramichi – Kynar lined steel pipe.

Chris Kanters suggests to create hardness of water.

Q. Need to lower pH to the D₁ stage. What is the safest way to run acid to this

stage?

A. 10% acid mixed with Cl0₂ before mixers. Sodium sesquisulphate to MC pulp feed pump.

temperature.

A. Stuart Scott – FRP and D stages relined every 8 – 10 years.

Gerry Pageau – FRP – no relining.

HW not a problem because there is no Cl0₂ around when you shrink face wires.

Q. Weld rod on D₁ 254 SMO drum?

A. No answer – call Steve Clark from Paprican.

Q. At Cornwall we run on E_p stage at low consistency (about 7 – 8%). Can we

expect significant benefits if we increase consistency to 10 – 11%?

A. Steam savings might be greater than chemical savings.

Should have chemicals. Need a mixer, if not it might get worse.

Some information in the literature.

Q. Any way of predicting outbreaks of pitch before it accumulates heavily in

storage tanks?

A. Centrifuge test (Bob Duncan).

Supplier of pitch dispersant does periodic tests.

Dirt counter for pulp (image analysis).

Cam Bleackley, FCCL, Mackenzie, British Columbia

Q. Looking for a reliable Cl0₂ gas analyser for B.P. stack.

A. Northwood – Paragon electrochemical unit has been very successful

($ 20,000. US).

Howe Sound – Amotech very good but very expensive.

Sterling Chemicals – Optek.

Q. Some mills looking for a reliable, low maintenance on-line pH sensor. pH sensor

tends to drift and requires frequent calibration that has caused a lot of problems

to the mill operation.

A. Recommend by Celgar and Crestbrook TB1 sensor seems to be quite good.

BTG suggests to use extractor for the pH sensor.

Q. Anybody use Alhmix in low C’s mixing of Cl0₂? Would like to get the name of

mill and its experience and contact name.

A. Nobody other than P.A.

Suggest to say with static mixer. See no advantage in mixing.

See no advantage in mixing.

Q. Kappa Factor Control with or without compensated brightness?

A. Suggest to pose question in PAPTAC Bleaching Committee bulletin board to

cover more people and more responses.

Q. Any experience with "peripheral" lockouts.

A. Yes, Tembec-Skookumchuck, Boise Cascade, digesters at Skeena,

Prince George.

Q. Cl0₂ Floating roofs?

A. Harmac – removing to allow repair of FRP.

Hinton – had to cut out to allow tank repairs.

Crofton – still in.

Weyerhaeuser, GP – still in (10 years), some stretching.

Northwood – removed after getting holes

Q. Anyone using liquid S0₂? (for antichlor).

A. Yes – several. Murray Walters did an E-mail survey – he will resend this out.

Q. Combined condensate is still available at DMI. Is anyone using combined

condensate in the Bleach Plant. Where?

A. Common practice is to use combined condensate for post 0₂ washing.

Some applications in Europe. Counter-current washing.

Q. Antichlor Question – sodium bi-sulphite.

A. See E-mail summary.

Q. MgOH deposits in D₁ stage tower dilution plugs 6" line. It seems to be caused by

NaOH addition.

A. Reduce MgS0₄.

Reduce NaOH addition – go to DD instead of DnD.

Try additive.

Try magnetic device for scale prevention.

Q. HSPP is planning to use sesquisulphate for D_o pH control to reduce the amount

of H₂S0₄ used. Any comments or suggestions?

A. Keep an eye out for scaling caused by the extra sulphur in sesquisulphate.

Use Kynar pipe.

Have good acid back up system

Call Hinton or other mills which currently use it.

Q. At present we have little or no fine chips in our Kamyr feed. With the start up

of the new chip thickness screening, we will be blending pins with the chips.

Looking for input for other mills how much pins we can add and not get

digester hang ups?

Q. OX on pulp?

Which mills are measuring it.

Adjust process for special customer?

A. Harmac – no special run.

Squamish – Yes – lowering Kappa factor.

Howe Sound – experimenting.

Q. Three mills in Florida have a conductivity limit on effluent discharge. Do any

mills here have a limit? Do people track internal sources (% age from

bleaching, liquor, machine)?

A. Grande Prairie (Weyerhaeuser) has a guideline.

Harmac have a guideline and a red light when they are over.

Harmac, Crestbrook and Irving have current and/or historical data on vacuum

and amounts.

Harmac data predates secondary treatment, and they could use it to estimate

volume of material (i.e., dregs or green liquor).

Q. On an R-8 saltcake slurry tank, how are mills controlling the dilution water to

the tank?

A. Skeena, Marathon, Alpac (1.18 sg.), Powell River (1.25 sg.) all Nuclear.

P.A. – micromotion density.

Howe Sound – flowmeter one continuous flow setting.

Q. Are there any mills that have gone from a bag tale system to a bulk talc system?

If so how did you justify this?

A. No mills have done this!

Q. What pH should we be targeting for in a low consistency D_o stage?

A. pH 2.5 – 3.0, 4.5% Cy, 2 – 2.5% Cl0₂ application.

Q. As bleach plant controls have been implemented, have any mills found a limit

in total H₂0₂ that can be applied based on final pulp strength losses (e.g.,

viscosity, 2-span tensile) and not on costs?

A. John Brazil (PG Pulp) – 2.5% on pulp in D(E_op) for 80% ISO pulp.

Peter Gleadow – About 5.8% on pulp now at L-P Samoa (was 9.0%).

Marco Solinas, Cornwall – use up to 5 Kg/ADT in EIP. Quevillon 2 cp less over

5 Kg/ADT H₂0₂.

Prince Rupert Pulp – 6 Kg/BDT – E_op < 2 Kg/BDT in E₂P or losses seen.

HSPP - < 2 Kg/tonne (no MgS0₄), 2 – 8 Kg/tonne (MgS0₄ needed).

Weyerhaeuser, Grande Prairie – have used up to 1.5% H₂0₂ on pulp.

Canfor-Intercon use up to 7 Kg/ADT, MgS0₄ added in E_op and E₂P.

Q. R-8 saltcake filter system excessive wear on "wear plate". Do other mills

measure and control vacuum pressure?

A. Steam flow control valve controls to 500 mm.

Lance Anderson – Canfor.

Q. How many mills use peroxide tower in their Bleach Plant?

A. One mill – LS Quevillon Domtar mill.

Q. Anyone notice a difference in chemical efficiency if MC D_o stage temperature is

significantly increased, i.e., 110^oF to 165^oF?

A. Northwood went from 50C to 80C with no observed difference in efficiency.

Weyerhaeuser PA went 50 to 50C same result.

Fraser-Thurso 40C to 60C same result.

Q. Anyone using static mixers at 10 – 12% CS?

A. HSPP, Skeena, Northwood use on 0₂ delig. for steam mixing successfully, Also

Riavellin Brazil, Kamloops uses one in the same position but experiences

plugging and vibration.

Q. Anyone running an Ahlmix at > 1800 RPM?

A. Check with Fred Munro at Domtar Espanola.

Q Anyone have their own shower bar/nozzle designs.

A. No!

Q. Who has run into environmental issues while dredging the lagoons?

A. Fletcher at Mackenzie and Weyerhaeuser at Kamloops. Also Grande Prairie

had high furan issue in the solids. All contained in landfill or basin.

Q. Who has undertaken water reduction project and how successful was it?

A. Crestbrook – water usage reduced by 2000 gpm. Now at 43 m³/l total

usage.

Miramichi – 2800 gpm reduction.

Harmac – 2800 gpm reduction.

Q. Sulphuric acid tank reached its minimum thickness at our Ft. Saskatchewan

facility.

A. Rather than replacing the tank, after evaluating several coating materials a new

low temperature cure material was used to line the tank at 10% of the

replacement cost.

Q. With mills that have encountered furans in sludge, how have you handled the

sludge?

A. Weyco, Kamloops – landfill at high consistency.

Weyco, GP – landfill plan to incinerate in proposed co-generating.

Mackenzie – landfill at high consistency.

A. Crestbrook 140F (60C)

Grande Prairie, 125F in Do, so suspect BS temp low (follow up with Tina)

Prince George P&P, 75C (167F)