Combinations of treatment processes for water recycling in the pulp&paper industry

Transcription

1 Combinations of treatment processes for water recycling in the pulp&paper industry M. Engelhart, B. Simstich, M.-P. Denieul VII Anque International Congress 13th-16th June 2010, Oviedo

2 Content Background Unit operations Site planning Treatment lines Outlook 2

3 Background Lab tests for evaluation SP00 Coordination & Management SP1 SP2 SP3 Water Fit-for-Use SP6 Verification on pilot scale Reduce Fresh Water Needs SP4 Intergation to sustainable industrial water management SP5 5 Pilot cases in the 4 target industries Knowledge transfer & Dissemination 3

4 Parties involved 4

5 Unit Operations Scheme Activated Sludge High Speed Filtration Anaerobic Reactor MBR NF / UO Softening AOP Evaporation 5

6 Unit Operations (1) Anaerobic Reactor Biological pre-treatment Assessment of concentrate effects Activated Sludge / 3FM Biological post-treatment Solids removal, filtration assessment MBR Biological post-treatment Filtration assessment (scaling) 6

7 Unit Operations (2) NF / UO Production of high grade reclamation water Comparison of pre-treatment: scaling, fouling AOP Effluent / concentrate COD + SAC removal Evaporation Concentrate handling Softening NF pre-treatment vs. conditioning 7

8 Site planning PARALLEL SITE SUPPLY: for water, electricity and samples Pipes, hoses and tubes from site to site = buffer tank = street = grassland = "supply channel" for samples, fresh water, power, waste water disposal Lab 3FM Evapoconc. Softening O3 12 m one box = 1 m VEO street access to the sites chemicals WED 32 m one box = 1 m samples in cooling O2-Storage where to put??? MBR PTS waste water out Tent NF ENV Lab Anaerobic 18 m biogas torch 8

9 Treatment lines Ozone 1-2 weeks? 1 3FM Soft. NF Evapo. 2 Ozone 3 Ozone MBR without softening 4 Evapo. MBR without softening/ NF with acid 5 Anaer. Soft. MBR Soft NF Ozone if softening not working after anaerobic optional: 6 3FM Ozone MBR 9

10 Reclamation Water Quality (1) Low (misc. dilution) Medium (spraying nozzle) High (white paper grade) Cond. [µs/cm] Cl - [mg/l] Ca 2+ [mg/l] Colour 500 < 300 < 200 n/a 500 < 200 < 60 n/a SS [mg/l] coarse sieve (< 5 µm) COD [mg/l] n/a BOD [mg/l] red. < 200 low 500 < 200 < 60 none 10 < 50 < 3 10

11 Paper type Graphic Packaging Sanitary Other Si Fiber source recovered fresh recovered Deinking Paper type Graphic Packaging Sanitary Other Single Users Fiber source recovered fresh recovered Deinking without without Reclamation Process Water Quality (2) Location Unit 1st loop 2nd loop Mechanical Process Process Process Process Felt & wire water pulp cleaning Water ring pumps Chemicals Heat preparation exchangers PM loop DIP DIP PM loop PM loop PM loop PM loop Spraying nozzles ph Location - Unit 7,0 8,5 1) 7,5 8,5 Process 1) 7,5 8,5 1) 6,0 7,0 1) (5,9) 6,3 7,3 Mechanical 7,1 8,1 7,1 8,3 6,0 8,0 6,7 7,3 > 7,0 6 8 (7,5) (8,1) (8,3) (8,0) > 7 water pulp Temperature C ) ) ) ) (48) (44) (46) (46) < C Conductivity, µs/cm ) ) ) < C (2 000) 4) (13 000) (3 500) (4 000) (3 200) COD mg/l ) ) ) (10 500) 4) (25 000) (1 000) (2 500) (750) Cl - mg/l 100 2) n.a. n.a. n.a ( < 700 (20 C) 200) (700) (700) (550) < 200 < 200 (50 C) ph - 2- SO 4 mg/l 7,0 8,5 1) 7,5 8,5 1) 100 2) 300 2) 200 2) n.a. 7,5 8,5 1) ( ,0 7,0 1) (5,9) 6,3 7, ,1 8, ,1 8,3 6,0 8,0 600) (900) (600) (7,5) (850) < 100 (8,1) (8,3) (8,0) Ca 2+ mg/l (3 800) (1 800) (330) (250) Temperature C 1) 1) 1) 1) Hardness mg/l (CaCO ) 50 2) 200 2) 150 2) n.a (48) (44) < 200 (46) (46) 1st loop 2nd loop Process Process Process Process F PM loop DIP DIP PM loop PM loop PM loop PM loop S Conductivity, µs/cm ) ) ) (2 000) 4) COD mg/l ) ) ) (10 500) 4) Cationic demand µeq/l 25 2) 200 2) 125 2) n.a. 350 TS mg/l 500 TSS 25 C mg/l (13 000) (3 500) (4 000) 120 Inorganic SS mg/l < ppm Dissolved solids mg/l < 1000 TA mg/l 85 (25 000) [HCO - 3 ] / [SO 2-4 ] - (1 000) (2 500) (750) > 1 LSI 1) - < 0,5 < 0,5 0,5 1,0 0,5 1,0 Cl - mg/l 100 2) n.a. n.a. n.a ( Mg 2+ mg/l 15 Fe mg/l 200) (700) 0,2 (700) (550) Mn mg/l 0,05 0,1 2- Free SO 4 SiO2 mg/l mg/l 100 2) 300 2) 200 2) n.a ( Free CO2 mg/l 10 < 10 Free Chlorine mg/l 600) (900) (600) 1 (850) < 0,5 + N-NH 4 mg/l 1 3) 1 3) 1 3) n.a. Ca 2+ mg/l N-NO 3 mg/l 1 3) 1 3) 1 3) n.a N-NO 2 mg/l 1 3) 1 3) 1 3) n.a. (3 800) (1 800) Total P mg/l 1 3) 1 3) 1 3) n.a. Hardness mg/l (CaCO Fungi UFC/ml 3 ) 50 2) 200 2) 2 3) 2 3) 2 3) n.a ) n.a. 2 Algae UFC/ml 2 3) 2 3) 2 3) n.a. 2 Cationic demand µeq/l Microorganisms per ml 25 2) 200 2) 10 3) 10 3) 10 3) n.a ) n.a TS mg/l (330) (3 200) (250) 11

12 TSS (mg/l) 23 MS à 105 C (mg/l) 1700 Turb (FAU) 21 TA/TAC ( df) 0/115 BOD 5 (mgo 2 /L) 52 tcod (mgo 2 /L) 154 scod (mgo 2 /L) 144 DOC (mgc/l) 43 COT (mgc/l) 46 SO 4 (mg/l) 60 N-NH 4 (mgn/l) 1 N-NO 2 (mgn/l) 0,52 N-NO 3 (mgn/l) 0,22 P total (mgp/l) 0,6 P-PO 4 (mgp/l) < 0,6 Al (mg/l) 0,21 B (mg/l) 2,6 Ba (mg/l) 0,1 Ca (mg/l) 140 tfe (mg/l) 0,22 K (mg/l) 9 Mg (mg/l) 20 Mn (mg/l) 0,02 Na (mg/l) 400 Sr (mg/l) 0,58 Cl - (mg/l) 180 F - (mg/l) < 0,2 Si (mg/l) 5,15 Silice totale (mgsio 2 /L) 9,25 ph 8,09 T ( C) 24,3 C (ms/cm) 2,68 TSS (mg/l) < 10 TS à 105 C (mg/l) 1600 Turb (FAU) 1 TA/TAC ( df) 0/99,2 BOD 5 (mgo 2 /L) < 1 tcod (mgo 2 /L) 98 scod (mgo 2 /L) 97 DOC (mgc/l) 26 COT (mgc/l) 30 SO 4 (mg/l) 54 N-NH 4 (mgn/l) < 1 N-NO 2 (mgn/l) < 0,3 N-NO 3 (mgn/l) < 0,5 P total (mgp/l) < 0,5 P-PO 4 (mgp/l) < 3 Al (mg/l) 0,16 B (mg/l) 2,6 Ba (mg/l) 0,061 Ca (mg/l) 120 tfe (mg/l) 0,2 K (mg/l) 11 Mg (mg/l) 23 Mn (mg/l) < 0,01 Na (mg/l) 460 Sr (mg/l) 0,45 Cl - (mg/l) 170 F - (mg/l) < 1 Si (mg/l) 5 Silice totale (mgsio 2 /L) 9,1 Couleur (mg Pt /L) 200 TSS (mg/l) < 10 F - (mg/l) < 1 TS à 105 C (mg/l) 310 Al (mg/l) < 0,025 Turb (FAU) 0,3 B (mg/l) < 0,05 TA/TAC ( df) 0/0,6 Ba (mg/l) < 0,05 BOD 5 (mgo 2 /L) 2 Ca (mg/l) < 1 tcod (mgo 2 /L) < 30 tfe (mg/l) < 0,05 DOC (mgc/l) < 2 K (mg/l) 4 COT (mgc/l) < 2 Mg (mg/l) < 1 SO 4 (mg/l) < 20 Mn (mg/l) < 0,01 N-NH 4 (mgn/l) < 1 Na (mg/l) 90 N-NO 2 (mgn/l) < 0,3 Sr (mg/l) < 0,05 N-NO 3 (mgn/l) 3,30 Couleur (mg Pt /L) 5 P total (mgp/l) < 0,5 ph 5,68 P-PO 4 (mgp/l) < 3 T ( C) 25 Cl - (mg/l) 160 C (ms/cm) < 1 Spores de µorganismes (n/20ml) Coliformes totaux (n/100ml) Coliformes thermotolérants (n/100ml) Entérocoques (n/100ml) µ-org revivifiables à 22 C (n/ml) µ-org revivifiables à 36 C (n/ml) Legionella sp (UFC/L) legionella pneumophila (UFC/L) < < 500 < 500 ph 8,09 Re-usable water Re-usable water HRT wastewater 3FM tests Flux = 65 L/h NF tests Concentrate Flux = 125 L/h Concentrate pressure = 25 bars Evapo - Concentration Temperature = 63 C Pressure = 145 mbars tcod (mgo 2 /L) 39 N-NH 4 (mgn/l) 1,568 Na (mg/l) 6,01 Cl - (mg/l) 10,41 ph 6,7 T ( C) 25 C (µs/cm) 4,92 tcod (mgo 2 /L) 5190 Na (mg/l) SO 4 (mg/l) 7781,3 Cl - (mg/l) 28832,9 Ca (mg/l) 5694 ph 5,72 tfe (mg/l) 6,42 T ( C) 35 Mg (mg/l) 1256,4 C (ms/cm) 85,7 Lab test Results TA/TAC ( df) 0/4,1 P-PO 4 (mgp/l) 11,60 tcod (mgo 2 /L) 799 Ca (mg/l) 1090 scod (mgo 2 /L) 849 tfe (mg/l) 2,25 SO 4 (mg/l) 558 Mg (mg/l) 220 N-NH 4 (mgn/l) 0,7 Cl - (mg/l) 5880 N-NO 2 (mgn/l) n. d. ph 6,05 N-NO 3 (mgn/l) 6,25 T ( C) 20,2 P total (mgp/l) 12,10 C (ms/cm) 19,21 Softening ph = 9 Addition of CaCl 2 and Ca(OH) 2 Sludge residence time = 30 min TSS (mg/l) 22 N-NH 4 (mgn/l) < 1 tfe (mg/l) < 0,05 TS à 105 C (mg/l) 1200 N-NO 2 (mgn/l) < 0,3 K (mg/l) 11 Turb (FAU) 30 N-NO 3 (mgn/l) < 0,5 Mg (mg/l) 2 ph 9 TA ( df) 0 P total (mgp/l) < 0,5 Mn (mg/l) < 0,01 T ( C) 20 C TAC ( df) 36,3 P-PO 4 (mgp/l) < 3 Na (mg/l) 369 tcod (mgo 2 /L) 90 Al (mg/l) < 0,025 Sr (mg/l) < 0,05 scod (mgo 2 /L) 90 B (mg/l) 1,8 Cl - (mg/l) 430 COT (mgc/l) 21 Ba (mg/l) < 0,05 F - (mg/l) < 1 SO 4 (mg/l) 50 Ca (mg/l) 44 Couleur (mg Pt /L)

13 Interactions SP 3: Lab Test / Technology Development SP 1: Water Quality Definition SP 5: Pilot Case Verfication Simulation Tools 13

14 Conclusion Combination of treatment processes will be chosen according to water quality needs Lab test results will be verified on pilot scale taking changes of influent water quality and pocess stability into account Comprehensive mapping of water circuits and water qualities on practcal level will be done Cost assessment Comprehensive strategies and guidelines for water reuse in paper industry 14

15 Acknowledgement Thank you for your attention! Financial Funding by the European Community within the Seventh Framework Programme (Grant Agreement No ) is gratefully acknowledged. 15