VertaseFLI. The UK experience and its applicability to the Irish market. Presented by Dr Chris Piddington

Transcription

1 VertaseFLI The UK experience and its applicability to the Irish market Presented by Dr Chris Piddington

2 FLI Eire Landfill Lining Brightwater FLI Water Engineering FLI Eire Special Projects World Wide ABiC FLI Engineering Services The FLI Group Vertase FLI Remediation Lining Applications 3NRG Municipal Waste To Energy FLI France Landfill Lining Specialist Lining

3 Contaminated Land Capability Ex-situ Bio Physical Barriers and Permeable Reactive Barriers Ex-situ Vapour Extraction Vapour Extraction In-situ Bio Air Sparging Dual or Multi Phase Extraction Surfactant Addition Enhanced Natural Attenuation Biochemical Amendments Cement Based Fixation Thermal Enhancements and Treatments Stabilisation Pump and Treat Hazardous Waste Pre- Treatment Excavation and Disposal Hazardous Waste Stabilisation Free Product Recovery Thermal Enhancements In-situ Chemical Oxidisation

4 Presentation Overview Today I want to present case studies of three of our recent projects. They are each very different sites, each with different histories, different remedial solutions and different uses post remediation. However, one common factor is that they all represent remedial solutions equally applicable in the UK as in Ireland. In each instance the remediation elements were conceived, designed and executed by VertaseFLI

5 What is the Irish Market? Within the UK site based remediation has a relatively short track record extending back approximately 20 years. However fair to say that within Ireland there has been limited on site remediation to date. Hard to estimate extent of the contaminated land problem but EPA estimate that there are over 2,500 sites that potentially pose a risk to environmental receptors, including up to 80 disused gasworks sites. In 2006 over 400,000T of contaminated material was exported from development sites, potentially this could have been treated on site. However there is a growing recognition, aided by evolving European Legislation that on-site remediation represent a cost effective, sustainable and appropriate solution for brownfield sites. The case studies presented all illustrate situations and solutions that are applicable to the Irish market place.

6 Case Study 1 Cannock, Bellway Homes, Pritchard Developments, Former Automotive Lighting Factory

7 Reclamation Strategy Large scale demolition and decommission effluent treatment plant. Significant underground structures to be removed. Uplift, crush and recycle all concrete slabs and remove below ground obstructions and foundations. Ex-situ Bioremediation of selected soils from earthworks cut to fill. 3 separate in-situ treatment areas for removal of TCE and Chlorinated Solvents. Cut to fill earthworks and provision of piling mats. Value: 1,000,000 (demolition, remediation and earthworks). Duration 42 Weeks total. Techniques, Air Sparging and Soil Vapour Extraction, Ex situ biological treatment.

8

9 Warehouse Facility to be Demolished

10 Ongoing demolition with careful segregation and recycling of materials

11 Below ground structures and basements requiring removal

12 Concrete slab lifted, underlying soils chemically tested

13 Concrete slab crushed, tested and re-used on site.

14

15 Treatment Well Installation and Well Monitoring Works

16 System Installation and Surface of Vapour Recovery Trenches

17 Process Plant including effluent treatment

18 Schematic of Treatment Configuration

19 Well Monitoring Data.

20 30 Cannock Lakeside Area 1 Mass Removal (kg/week) 25 Cannock Lakeside Area 2 Mass Removal (kg/week) KG removed KG removed Week No. 80 Cannock Lakeside Area 1 Cumulative Removal (kg) Week No. 60 Cannock Lakeside Area 2 Cumulative Removal KG removed KG removed Week No. Week No. Treatment system recovery data.

21 Earthworks to achieve site development levels

22 Case Study 2 Former Chemical & Tar Works, Cadishead, Manchester

23 Scheme Headlines o Value: 3,200,000 o Site Area: 65,000m2 o Contaminated soil: 120,000m3 o Contaminants: Tar, Oils, Diesel, Naphthalene, BTEX, Phenol o Geology: Made ground over Alluvial Silts over Sandstone o Groundwater plumes: 3 o Development plans: 380 New Homes o Timescale: 70 weeks o Terms: Lump Sum All Risk

24 Soil Problems Site Soils Contaminated With: General Oils and Hydrocarbons PAH s Phenols BTEX Naphthalene From Surface to 5 Metres: Total Volume = 120,000m 3 Geotechnically Unsuitable = 60,000m 3 Chemically Unsuitable = 120,000m 3

25 Ground Water Problems Shallow groundwater within made ground severely impacted Free product over significant area of the site Contaminated with: Phenols PAH Hydrocarbons BTEX Naphthalene Creosote Tars Deep Groundwater 5-8m below ground level Contaminated with: Phenols Naphthalene BTEX

26 Reclamation Strategy Complete demolition and re-use all available materials on-site wherever possible Recover all effluent from underground structures. Gain access to shallow perched effluent table for dewatering and treatment on site Excavate contaminated soils, characterise on-site and process for treatment wherever possible. Segregate materials for treatment by biological methods, ex-situ vapour recovery, ex-situ oxidation or off site disposal. Remediate deeper groundwater and remove as much mass as practicable. Provide capillary break layer and levels at the site to allow for clean cover layer. Restore site for Housing, with detailed geotechnical specification to allow for no geotechnical abnormals.

27 Pre-Remediation Planning and Phasing Petroleum Contamination 0.5 to 1m Phased Works Plan

28 Sequence of Works Phase 1 (4 weeks) Mobilise water treatment plant Dig Grips across site to collect free oils and water Dewater made ground for excavation Phase 2 (4 weeks) Demolish remaining buildings Uplift slabs Remove foundations Recycle and treat hard standing Phase 3 (40 weeks) Excavate site in progressive manner Sort and prepare for Bio-treatment Dispose untreatable contaminated soils Phase 4 (10 weeks) Validate and re-compact Phase 5 (48 weeks) Installation and operation of 3 dedicated in-situ systems to treat deeper groundwater plumes. One plume general hydrocarbons One plume Phenol and xylene One plume naphthalene Systems installed beneath Bio treatment beds

29 Practical Aspects: Main Challenges Contaminated from Surface to 5 m above water table Contaminated effluent throughout made ground Geotechnically poor materials Whole footprint of the site was contaminated above targets Strict controls on discharge of water to sewer Residential end use Restricted lorry movements and access Residential properties close to site Difficult soils Deep excavations required

30 Demolition of buildings, Thorough soft strip of building first with waste segregation, collapse steel structure, collect, gauge and send steel for recycling.

31 Segregate hard materials and separate from contaminated hard for re-use on site.

32 Carefully breaking out structures separating hard from soft materials. Hard materials for segregation and processing, on site.

33 Segregating grossly contaminated pipe runs

34 typical below ground drainage run. Note contamination inside and outside the pipe

35 Recovering unusable materials for off site disposal from effluent pit

36 Typical surface effluent for collection and treatment on site

37 Recovering perched groundwater/effluent

38 Selective excavation, key to maximising treatment efficiency and minimising costs.

39 Planned, phased remediation, with excavation, pumping, treatment beds and validation all running concurrently.

40 Bespoke modular groundwater treatment plant for treatment of effluent. Allows for re-use on many sites.

41 Latest, most efficient screens for processing to maximise reuse of materials.

42 Ex-situ Biological Treatment Beds

43 Lining and turning treatment windrows

44 Reduced Level installation of Naphthalene in-situ treatment

45 In-situ Installation of Dual Phase System.

46 Naphthalene sparging and vapour recovery units.

47 Ex-situ Oxidation of recalcitrant contamination just above remediation target.

48 Restoration and compaction

49 Knotweed, treated and re-incorporated into POS area.

50 Naphthalene at in-situ 1 TPH Concentrations in In-situ 2 Naphthalene content ug/l Week sampled TPH content mg/l Week sampled PID readings from exhaust on zone 1 in-situ system (Naphthalene Plume) VOC/SVOCs' (Naphthalene) ppm Days Sustainability of treatment Versus Targets for remediation. A difficult decision for Regulators!

51 Case Study 3 Enhanced Anaerobic Degradation, Killingworth, Newcastle-Upon-Tyne

52 Scheme Headlines High levels of TCE in shallow groundwater Large plume area Ongoing Issues regarding spillage 24hr, 360 days year operational plant. Extremely confined access Concerned American parent company Value: 200,000 Duration: ongoing Solution: Enhanced and Augmented in-situ Anaerobic degradation

53 Contaminated with Trichloroethene TCE (39,000ug/l). Designed in-situ recirculation plant. Abstraction, dosing, and injection of site groundwater with Emulsified Soya Bean Oil (EVO) and Sodium Lactate.

54 Some Chemistry; Principal Reductive de-halogenation TCE DCE VC Anaerobic Anaerobic Anaerobic / aerobic? Ethene/Ethane/CO 2

55 Installed Borehole location plan

56 Unit containing injection and abstraction pumps Emulsified Soya Bean Oil (EVO) inside bund Site Injection Equipment

57 Injection and Abstraction System

58 Abstraction well Injection wells Site Injection and recirculation Equipment

59 O 2 Free Nitrogen KB-1 culture Anaerobic injection of KB-1 on completion of injection works KB-1 Injection

60 KB-1 Injection and associated monitoring

61 1,250 1, BH204 24/09/ /10/ /11/ /11/ /12/ /01/ /01/ /02/2009 Time TCE DCE VC Concentration μg/l

62 15,000 14,000 13,000 12,000 11,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 BH119 22/05/ /07/ /08/ /10/ /12/ /01/2009 Time TCE DCE VC Concentration μg/l

63 Changes in TCE, DCE and VC Concentration Well Date Concentration μg/l TCE DCE VC MW1 06/08/ /11/ ,000 1,800 5,300 12, BH109 17/07/ /11/ , BH112 15/07/ /08/ ,000 <1.0 1,000 5, BH202 01/10/ /12/2008 1, ,203 <10 19 BH206 01/10/ /12/2008 1, ,507 <10 160

64 Troll 9500 Water Level Data

65 Troll 9500 ORP (REDOX) Data

66 Summary On completion of current injection works: Abstracted and injected 243,330 litres of groundwater. Injected 11,854 litres of EVO. Injection of 165kg of 60% sodium lactate. Injected 71kg of KB-1 into 26no. Wells. Ground conditions: Dissolved Oxygen <0.5 mg/l. Redox Negative (-50 greater). Anaerobic ground conditions achieved across plume. Degradation & monitoring ongoing but decreased TCE levels and increased DCE demonstrate success of augmentation to date.

67 Summary Project 1. Former automotive manufacturer via in-situ Air Sparging and Vapour Extraction for mixed end use. Project 2. Former Tar Works via ex-situ bio and in-situ techniques for residential end use for EP Project 3. Active Manufacturing site via In-situ anaerobic degradation for continued operation without disruption to business for American Manufacturer

68 Thanks For Listening Contact Us: Chris Piddington