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MANAGING EFFLUENTS IN PULP & PAPER INDUSTRY Rakesh Uniyal- Valmet, India Heli Karaila- Valmet, Finland
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MANAGING EFFLUENTS IN PULP & PAPER INDUSTRY
Rakesh Uniyal- Valmet, India
Heli Karaila- Valmet, Finland
Challenges
Ever growing demand for a cleaner environment
New norms for effluent discharge
Increase in overall production Costs
Decrease in product sales margins
Selection of right technology
Measurements of various ingredients of effluents
Disposal of solid waste
Date Author Title ©Valmet2
Effluent generation benchmark
21 April 2023 © Valmet | Author / Title3
Short Term Standards
Effluent generation benchmark
21 April 2023 © Valmet | Author / Title4
Long Term Standards
New NormsNorms for Treated Effluent Quality for RCF and Market Pulp Based Pulp & Paper Mills
21 April 2023 © Valmet | Author / Title5
Note:
The above effluent discharge norms or effluent norms as prescribed by the concerned State Pollution Control Board, whichever are stringent, will be applicable.
Solutions
Optimizing the Pulping & Paper Process
- by selecting right technologies in the process
- by measuring critical process parameters
- by controlling the process variables based on accurate measurements
Optimizing the Effluent treatment process
- selecting technology suited to your needs
- measuring critical process parameters in ETP
- controlling the process and minimizing contaminated content
Date Author Title ©Valmet6
Measurements in pulping
Date Author Title ©Valmet7
• Consistency management• ERIC management • Brightness management
DIP consistency measurementsDate Author Title ©Valmet9
Ash consistency measurement in DIP
Date Author Title ©Valmet10
Consistency measurement in OCC line
Date Author Title ©Valmet11
Stock preparation Consistency
Date Author Title ©Valmet12
ERIC & Brightness measurements in DIP
Date Author Title ©Valmet14
Customer case in India
Khanna Paper Mills is an ISO 9001:2000 certified company
320 TPD DIP plant feeding PM-5 was one of the initial priorities for optimization.
Major challenges in this DIP were Brightness/ERIC variation and hence rejections
Excess chemicals were being used to compensate for Brightness drop.
In February 2013 Valmet installed INLINE sensor CORMEC 5 for the measurement of ERIC and Brightness at two stages to start with:
- MC-Pump number 1 i.e. before addition of H2O2
- MC-Pump number 2 i.e. before addition of Na2S204
Date Author Title ©Valmet15
Reported savings were as:
- Reduction of Na2S204 consumption was up to 15%
- Reduction in H2O2 consumption was up to 10%
- Reduction in Brightness variability was more than 20%.
Ink deposition on PM-5 has reduced considerably leading to:
- Lesser use of cleaning chemicals
- Improvement in physical health of PM-5 with respect to improved felt & rolls life.
And finally: lesser chemicals in the effluent
Date Author Title ©Valmet16
Measurements in Wet-end and Machine area
Date Author Title ©Valmet17
•Freeness control•Consistency Control•Retention management•Chemistry management
Date Author Title ©Valmet18
Solutions cont…..
Optimizing the Pulping Process
- by selecting right technologies in the process
- by measuring critical process parameters
- by controlling the process variables based on accurate measurements
Optimizing the Effluent treatment process
- again.. selecting technology suited to your needs
- measuring critical process parameters in ETP
- controlling the process and minimizing contaminated content
Date Author Title ©Valmet19
Waste water treatment plan overview Total Solids, Low Solids, BOD/COD measurements
©ValmetDate Author Title20
Case study-1Shandong APRIL SSYMB Pulp & Paper, Rizhao
Plant phase I is 315,000 ton fine wood pulp annually
Plant phase 2 is1,000,000 ton fine wood pulp annually
Phase II waste water plant treatment capability is 130,000 ton per day
The normal sludge concentration of the sludge mixing tank outlet is 2%~4%
Valmet TS sludge concentration transmitter is used for the measurement and the control loop.
The final total solids concentration reaches about 40%. It decreases the sludge bulk and water content. It will be more convenient for the sludge storage and the transportation.
Date Author Title ©Valmet21
Schematic
Date Author Title ©Valmet22
Case study 2: Stora Enso Anjalankoski
Stora Enso’s Anjalan koski paper mill and Inkeroinen board mill in Finland form an in tegrated mill complex.
The customer has utilized the measurements in the bark sludge, primary and mixed sludge lines
On-line solids content measurement has enabled them to react to process changes immediately, which is very important in controlling sludge flows.
Date Author Title ©Valmet23
Technologies utilized In ETP measurements
Date Author Title ©Valmet24
Microwave Technology for Total Solids
Technologies utilizedMicrowave Technology
Date Author Title ©Valmet25
Measurement principle
• It measures the time of flight of a microwave signal in the sludge.
• Microwave’s delay time in water vs. total solids = a linear relationship:
Mic
row
ave
del
ay t
ime
(ps)
Total solids (%)
©ValmetDate Author Title26
Sludge pumping
Thickening
Digesting
Dewatering
Dry cake
Applications
Technologies utilized In ETP measurements
Date Author Title ©Valmet28
Optical Technology low solids in centrate
Low Solids measurement
Date Author Title ©Valmet29
Strong measurement cell
2 light sources, 6 signals
Absorption, back-scattering and depolarization signals
30
Optical measurement from the technology leader
©Valmet
Led nir
Ledvis
Lednir/Ledvis ref.
Polarizer
Spiegel
Probe
BS
Linse
Spiegel
Polarizer
Schematic of Total Solids/ Low Solids
©ValmetDate Author Title31
Summary
Date Author Title ©Valmet32
•Optimizing the pulping process and preventing excessive chemicals going into the effluent.
•Latest measurements along with controls in the waste water treatment plant will help to optimize the cleaning process.
For further questions please write to:
Rakesh Uniyal Pravin [email protected] [email protected]+919873159288 +919930250118
Date Author Title ©Valmet33
