Strategies for reusing canal sediments in the Scottish ...Rolling mill STW “After-Life” roll-out...
Transcript of Strategies for reusing canal sediments in the Scottish ...Rolling mill STW “After-Life” roll-out...
Strategies for reusing canal
sediments in the Scottish Circular
Economy Dr Richard Lord
University of Strathclyde
10th International SedNet Conference “Sediments on the move” Genoa, 14-17th June 2017
Alasdair
Hamilton Senior Project
Manager
@ScottishCanals
Bringing North Glasgow to Life
Regeneration
Ellen MacArthur Foundation (after Braungart & McDonough)
Scottish Circular
Economy Strategy
2016
• Scotland first country to join EMF CE100 programme in 2013
• A more circular economy could reduce C emissions by 11 MT pa by 2050
• £620M additional turnover and 5,700 new jobs by 2020
• Focus: food, bio-economy, energy infrastructure, construction sectors (last is 50% of total waste)
• Reduce food waste by 33% by 2025
Challenges (opportunities)
for Circular Economy
applied to sediments
18
• What are the “restorative & regenerative” options for dredged sediments? – Use in bank repairs?
– Replacing eroded soils?
– Contaminant removal?
• Renewable energy recovery?
• Soil/nutrients for bio-based economy?
• Preserve/enhance natural capital (eco-system services)
Knowledge Transfer Partnership 2012-15
Scottish Canals Knowledge
Transfer Partnership
“To embed an environmentally sustainable approach to sediment management, reducing operational costs, generating opportunities for revenue growth and addressing emerging waste legislation requirements”
The challenges
• Dredged sediments considered as “waste”
• EU Landfill Directive, Regulations and Landfill Tax makes landfilling “waste” costly
• Scotland’s Zero Waste Plan (2010): 70% recycling, 5% landfill by 2025
• Distributed, potentially contaminated, liquifaction on transport
• Uncontaminated treated as inert waste (but more likely non-haz)
Waste hierarchy approach
• Reduction: preventing siltation & targeting dredging
• Reuse: of materials
• Recycling: processing of materials for recyclates
• Renewable energy recovery
Reduction: (1) Plough dredging
in lochs on Caledonian Canal
23
24
(2) Targeted
spot dredging
25
(3) In-house dredging capability (≠ landfill)
Reuse: (1) Bankside restoration
under exemption Mar ‘14
26
27
Jun ‘14
28
Sept ‘14
29
Jan ‘15
30
May ‘16
31
Jun ’17
(2) Nicospan* trial
(with Scheduled
Ancient Monument
consent)
32 *www.greenfix.co.uk
Recycling (1) Pinkston Basin
contaminated sediment in
concrete?
33
34
35
Pinkston Basin – cube tests
36
0
2
4
6
8
10
12
14
16
18
20
Control 10% 20% 30% 50% 70% 100%Replacement of sand by dredgings
14 DAY TEST (MPa) 28 DAY TEST (MPa)
Cement (19), stone (45), sand (37)
Recycling: (2) Co-composting &
soil manufacture
37
38
39
40
41
42
43
44
Re-using brownfield sites for renewable energy crops
BioReGen Life Project 2005-10
Biomass Remediation (Re)Generation
Can brownfield (previously developed) sites be reused for (renewable energy) crops ?
BioReGen sites:-
Demonstrations 2007 Sewage works
Landfill
Colliery & coke works
Slag heap
Pilots 2004-6
Rural control
Urban control
Landfarm Coal ash landfill
Shipyard Steel works
Rolling mill
STW
“After-Life” roll-out 2010
Scotland 2013-14
Tees Barrage 2007-2012
Placed dredgings, Tees Barrage (2007)
50
Renewable Energy: (1) Bankside
vegetation – Phalaris arundinacea
(2) Weed cutting (the Berky)
52
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Distiler's spent grain
Dredged weed & rush
Green waste
Green RCG
Brown RCG
H20 % Ash % VS
60 NL. kg-1 VS
249 NL. kg-1 VS
Methane yields (m3 per wet tonne)
43.5 m3.t-1
49.3 m3.t-1
110 NL.kg-1 VS
20.8 m3.t-1
236 NL.kg-1 VS
13.8 m3.t-1
422 NL.kg-1 VS
85.9 m3.t-1
(3) Reuse dredgings to restore
canalside brownfield land or landfills?
Then use to grow renewable fuels?
266
172
40
6
730
274
538
130
56
39
511
391 552
507
520
689
227
575
174
365
471
271
264
43
4
46
0
226
309
487
74
596
38
379
352
611
25
412
353
435
44
519
42
2
434
45
773
732
424
564
147
729
145
559
529
739
530
490
431
437
646
256
247238
751
757
89
83
17
259
425
524
329
703
432
310
475
526
163
722
470
554
474
54
244
233
35
212
512
747
91
250
744
306
617
189
341
726
166
640
301
219
776
720
183
433
32
752
316
497
427
647
198
248
612
51
606
531
728
167
651
762
48
209
290
47
715
465
388
249
383
727
155
339
644
289
569
444
721
216
50
361
577
82
643
270
34
302
642
485
509
750
763
499
286
586
279
579
717
430
723
324
236
81
494
225555
496
696
645
576
295
655
265
75
716
61
72
704
540
293
214
26
767
29
385
110
783
464
237 261
291
283
71
57
394
37
58
542169
473
600
587
377
234
678
439
764
131
106
187
536
31
55
523
372
204
161
36
41
239
146
676
546
436
533
21
510
223
221
648
742
521
483
706
623
495
292
518
595
33
411
317
311
659
710
658
440415
423
537
708197
217
294
275
718
591
481
186
480
514
709
692
278
516
121
491
469
371
539
525
442
232
578
205
517
282
153
553
178384
235
472
346
532
Derelict Land
Vacant Land
Glasgow_2
0 0.5 1 1.5 2Kilometers
Sources:© Crown copyright and database right (2017). All rights reserved.
Ordnance Survey Licence number 100024655The Scottish Government April 2017
352
644
178542
651
444
643439
442
494
490
271
167
383
309
499
166
385
384
546
293
234
536
235
532
472 & 473
346 & 372
Scottish Vacant & Derelict Land Survey 2016 (2017)
North Glasgow
1 km
(4) Future: Advanced phyto-conditioning?
Yorkshire Water using ryegrass (Lollium multiflorum) to de-water sewage sludge (or sediments), blended with chipped recovered wood & sand for reuse as soils.
Regeneration