Water Management Challenges and Trends Facing the Coal Seam Gas and Mining Industries in Queensland - PowerPoint PPT Presentation

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Title:

Water Management Challenges and Trends Facing the Coal Seam Gas and Mining Industries in Queensland

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Lindsay Delzoppo General Manager, Operations Environment and Natural Resource Regulation Division Queensland Department of Environment and Natural Resource Management – PowerPoint PPT presentation

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Title: Water Management Challenges and Trends Facing the Coal Seam Gas and Mining Industries in Queensland


1
Water Management Challenges and Trends Facing the
Coal Seam Gas and Mining Industries in Queensland
  • Lindsay Delzoppo
  • General Manager, Operations
  • Environment and Natural Resource Regulation
    Division
  • Queensland Department of Environment and Natural
    Resource Management
  • Israeli Delegation - Water Technologies for the
    Coal Seam Gas Mining Industries Brisbane, 18
    May 2011

2
Outline of Presentation
  • Current water management issues for Queensland
  • Coal Seam Gas (CSG)
  • - protection of groundwater resources - quantity
    and quality
  • - desalination and use/disposal of treated CSG
    water
  • - management of salts and brines
  • - protection of soils, vegetation and
    biodiversity
  • - surface waters, world heritage values noise
    air amenity
  • Coal Mining
  • - water supply sources
  • - flood management
  • - dewatering of flooded pits and storages

3
Qld Water Links with Israel Water Expertise
  • October 2007 D-G of DERM, John Bradley, was
    member of a Trade Delegation to Israel to inspect
    water technology.
  • Met Director of the Israel Water Authority,
    sharing information on
  • recycled water policy
  • hydrologic risk analysis
  • climate change contingencies
  • desalination investment strategies
  • demand management and market reform.

4
Current Key Water Management Issues
  • Commission of Inquiry Jan 2011 Floods.
  • Environmental Recovery Reconstruction.
  • CSG Industry Water and Salt Management
  • Second generation Water Resource Plans
    (allocations) Environmental Values (water
    quality)
  • Urban water security (drought/climate change) and
    water costs (water use efficiency)
  • Coal Mine water management.

5
Total rainfall 28 Nov 2010 17 Jan 2011
6
Wivenhoe Dam at 197 2.26 Million ML
  • .

7
Upper reaches of Wivenhoe Dam (lt20) in drought
8
.
  • The CSG Industry in Queensland

9
Queensland Coal and CSG Production
All named basins have current exploration
10
The Great Artesian Basin (GAB)
11
A Typical CSG / LNG Project
  • Hundreds of CSG wells in Surat or Bowen Basin gas
    fields
  • Pumping of large amounts of slightly saline water
    (releasing pressure) from the coal seam releases
    adsorbed methane gas
  • CSG water RO treatment plants, water re-use and
    disposal
  • 300-400km gas pipelines from the gas fields to
    Gladstone
  • Liquefied natural gas (LNG) plant on Curtis
    Island export terminal containing LNG
    production and loading facilities (none built yet)

12
Coal Seam Gas Fields
  • .

13
CSG Fields
  • .

14
CSG Water Extraction
  • Groundwater extraction is an accepted,
    unavoidable, consequence of CSG extraction.
  • 2010 2,700 wells
  • 2015 10,000 wells
  • 2025 30,000 wells
  • CSG extraction could produce 125 - 280 GL /year

15
Managing Impacts of CSG Extraction
  • Great Artesian Basin (GAB), groundwater dependent
    ecosystems and water supplies to towns and
    landholders.
  • Potential for aquifer recharge
  • Preventing CSG water, brine and salts damaging
    the environment, water resources and soils.
  • Reuse and disposal of treated CSG water
  • Natural stream flow regimes
  • Good quality agricultural soils
  • Impacts on environmentally sensitive/conservation
    areas.
  • Cumulative impacts of multiple CSG projects
    including groundwater and surface water impacts.

16
Key Principles of CSG Water Management - 2009
  • CSG producers responsible for disposal of CSG
    water
  • Evaporation ponds to be discontinued as main
    means disposing CSG water
  • Producers to treat water to a quality set by DERM
  • CSG Water Management Plans approval stage with
    annual reporting against agreed criteria
  • Adaptive approvals regime.

17
CSG Water Policy - 2010
  • Preferred options for use of CSG water
  • aquifer injection (if matching quality)
  • untreated use where no impact
  • appropriate treatment and re-use for
    agricultural, industrial, potable purposes (now
    highly regulated0
  • Non-preferred options
  • disposal via evaporation dams
  • disposal to surface waters
  • disposal to land

18
Groundwater Regulatory Framework - 2011
  • Unlimited groundwater extraction is allowed under
    Petroleum and Gas Act 2004
  • Make good provisions for all water bores,
    groundwater dependent ecosystems and adjacent
    aquifers under the Water Act 2000
  • Clearly specified trigger thresholds for bores
    and springs
  • QWC role to monitor and model the predictive and
    cumulative impacts of CSG activities and produce
    Underground Water Impact Reports

19
Salt Management Hierarchy
  • Reuse to create useable or saleable salts or
    products
  • Inject brine underground when it can be
    demonstrated that there will be no adverse
    impacts.
  • Dispose to the ocean through pipelines - ensuring
    no local impacts.
  • Dispose of solid salt into a waste disposal
    facility.
  • Salinity in Murray Darling Basin is a particular
    concern.
  • Possibly 300,000 tonnes of salts per year (sodium
    bicarbonate, soda ash, table salt, caustic soda
    and calcium carbonate)

20
Coal Mining
  • Managing supply sources in drought
  • Flood water management
  • Dewatering of flooded pits, storages and tailings
    dams
  • Protecting mine water impacts on aquatic
    ecosystems and drinking water supplies

21
Environmental Regulation of Coal Mining in
Queensland
  • DERM regulates mines under Environmental
    Protection Act 1994
  • EIS undertaken for larger resource development
    projects
  • Coal Mines have Environmental Authorities which
    set out
  • enforceable environmental performance
    requirements
  • monitoring programs
  • reporting requirements

22
  • Jan/Feb 2008
  • Fairbairn Dam overflowed flooding Emerald

Department of Environment and Resource Management
23
Ensham Mine Pre-flood
Ensham Mine flood peak
24
  • Ensham Coal Mine most severely affected mine
  • 150,000 ML of trapped floodwater
  • Authorised discharge to the Nogoa River
  • Salinity increased as discharge continued
  • Domestic/drinking water supplies affected
  • Concerns over aquatic ecosystems impacts

Department of Environment and Resource Management
25
DERM Reviewed Performance of all Coal Mines in
the Fitzroy Basin
  • Key Recommendations
  • Better, and more consistent environmental
    conditions needed for mine water discharges
  • Develop local water quality guidelines for the
    Fitzroy Basin
  • Develop models for assessing cumulative impacts
    across the Basin (IQQM).

26
New Water Conditions for Coal Mines - 2009
  • Conditions largely based on protecting
  • Aquatic Ecosystems 1000 EC downstream
  • Drinking Water - 750 EC in receiving waters
  • Minimum 14 dilution for mine discharges
  • Release contaminant trigger investigation levels
    for metals
  • Receiving Water Environmental Monitoring Plans
  • Major flooding of Coal Mines in 2010-11
  • Monitoring data and conditions being refined in
    2011

27
Queensland Mineral Exploration Expenditure by
Mineral Sought - 2005 to 2010
WET
GFC

A Millions
Source ABS (8412.0 - Mineral and Petroleum
Exploration, Australia, Jun 2010)
28
Conclusion
  • Coal Mining and CSG Sectors in Queensland are
    large and growing involving investments of
    many billions of dollars
  • Sound water, wastewater and groundwater
    management is vital to the success of these
    sectors
  • Sheer scale of mining and CSG activities presents
    opportunities for those with expertise in
    large-scale water and wastewater management and
    treatment

29
Current Queensland Exploration and Development
Activity
Coal (70 companies)
96
Minerals (258 companies)
42
89
19
Source Intierra September 2010
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