Water is a key raw material for the manufacture of ammonia which is the key component of our explosives and fertiliser products. Within our ammonia plants, the majority of water use is for cooling during the manufacturing process. A small percentage is used for steam to power equipment and as an input for the chemical reaction that makes ammonia. The risks and opportunities associated with water management as it relates to climate change have been assessed and are described in our annual CDP Water Report.
While the majority of IPL's manufacturing plants are located in regions with plentiful natural supplies of water, some of our Australian sites and one in the South West of the United States operate in regions where water conservation is a critical issue. In other regions, where there is higher rainfall, we recognise that water management is also important.
Water use by source
During 2017 we withdrew 47,629 ML (mega-litres)
of water, a 9 percent increase from last year. This
increase is mostly due to the new Waggaman,
Louisiana ammonia plant. Our total reported water
use includes the categories shown on the right. A
large proportion of this water is used more than
once within our plants, but most sites do not meter
this recycling of water. 815 ML of water was recycled
and reused at sites which have meters. This represents 1.7 percent of our withdrawal and 5.2 percent of our total water use.
Water discharge by destination
During 2017 we discharged 32,446,002 m3 of water to the environment, an increase of 9 percent. This total discharge excludes sewage, discharge of collected rainwater and waste water removed for treatment or disposal as liquid waste (which are included under ‘Waste’). It includes some discharge of rainwater where runoff is collected and treated at several sites in North America, and therefore cannot be separately metered. As shown in the graph, most discharge was clean cooling water which was released to the natural waterways from which it was taken, reducing our net water use to 15,670 ML. We monitor the water quality of such discharges on an ongoing basis to meet local regulatory requirements and also seek to improve water quality beyond the standards required by licensing wherever possible.
Improving our performance
Continuous improvement opportunities include:
• At Cheyenne, Wyoming, the recovery of boiler blowdown water, and the reclamation of waste water streams through reverse osmosis and brine concentrator units saved 89,941 kL of water in 2017, exceeding annual estimations of 70,000 kL.
• Also at Cheyenne, a water balance project has identified 65,000 kL of water savings through the reuse of pond water and the recovery of barometric tank overflow and nitric acid blowdown waters. These projects will be implemented in 2018 along with water balance projects at three other manufacturing sites.
• At Carthage, Missouri, a 5 year project begun last year to completely redesign the site wastewater system has progressed to 40 percent completion in 2017. In addition to reducing waste water, significant water savings are expected due to the reuse of waste water streams.
• At Wolf Lake, Illinois, the use of recycled water in the scrubber system and centrifuge wash down was initiated. This will save over 300 kL per year.
• 64,937 kL of water was recovered from waste gypsum stockpiles at our Phosphate Hill site in Australia, also recovering valuable phosphates for fertiliser production.
In addition to IPL’s comprehensive annual risk management process, the WBCSD Global Water Tool is completed each year for long term projections and reviewed by the Chief Risk Officer. This analysis is used to identify sites at which water is a material issue.
The tool has identified one ammonia manufacturing site in the United States where baseline water stress in the water catchment area is high. It has also identified one ammonia manufacturing site and several smaller manufacturing sites in Australia as being located in water catchment areas areas which may experience water stress in the future (2025). Water supplies and management strategies at these sites are discussed below.
♦ Cheyenne: Wyoming, USA
At our ammonia manufacturing site at Laramie County, Cheyenne, Wyoming, USA, water resources are of particular concern and management involves multiple stakeholders. Located in a semi-arid area, water for the site is drawn from an underground aquifer which is recharged each year by precipitation, including snowmelt. We engage with key stakeholders including the Wyoming State Engineer’s Office (SEO) which manages stakeholder access to the aquifer and maintains databases for ground water levels, along with the Ground Water Division of the U.S. Geological Survey, and our Cheyenne site monitors wells through totalizing flowmeters and water level measurements and reports to the SEO annually. Water saving initiatives at the site include:
• The monitoring and maintenance of steam traps and condensate systems to reduce water loss.
• Operation of a brine concentrator unit which recycles approximately 100 gallons of water per minute.
• Operation of a mobile reverse osmosis unit, reclaiming approximately 75,000 kL of waste water for reuse each year.
• Communication to personnel through daily reports to watch for and prevent excess water from running.
• Visual management board for water reduction projects and efforts.
• The creation of the position of Focused Improvement Engineer in 2016 to focus specifically on water reduction opportunities, including the development of a complete water strategy for the site, which was completed in 2017 and has been submitted for management review.
♦ Phosphate Hill: Queensland, Australia
Located in the Georgina Basin, IPL’s Phosphate Hill site in remote North West Queensland manufactures ammonium phosphate fertilisers, which requires large volumes of high quality cooling water. In addition to its ammonia, rock processing, phosphoric acid and granulation plants, Phosphate Hill has its own phosphate mine, ore processing facility and, due to its remote location, its own gas fired power plant, reverse osmosis water treatment plant and employee accommodation village. The WBCSD Water tool identifies this site as being in an area which may experience water stress in the future (2025) due to the high inter-annual variability of rainfall. To ensure supply, groundwater is drawn under licence from the phosphate orebody, which is porous and contains an aquifer called the Duchess Embayment Aquifer (DEA).
The many aquifers in the Georgina Basin are naturally recharged by rainfall during the summer wet season and were identified as a renewable (annually replenished) groundwater resource with high groundwater development potential (over 100GL/yr) by a recent inquiry into the development of northern Australia by the CSIRO. Although wet season rainfall over the last several years in the DEA has been lower than the long term average, ongoing model prediction and quarterly monitoring conducted using 39 monitoring bores across the embayment indicate that adequate supply to the site is currently being maintained. In addition to monitoring for potential changes in the embayment, the Phosphate Hill site submits an annual Borefield Performance Report to the Queensland Government Department of Natural Resources and Mines (DNRM) each year in September and completes an Annual Aquifer Review in December each year.
Our Phosphate Hill site is committed to reducing water usage wherever possible through continuous improvements and water recycling strategies. These presently include multiple re-uses of cooling water (our major use) and reclamation of water from waste gypsum stacks. Mine dewatering, a process to remove water so that the phosphate ore body can be accessed, was ceased in 2015 and a third party specialist was commissioned to complete a Water Balance Study for the site. This initiated a project to identify specific actions to reduce water use at the site by 5% each year, commencing in 2016. As a result, the site used 11 percent less water in 2016 than the previous year. However, projects delivering targeted water reductions for 2017 were delayed due to the construction of a new evaporation pond. These projects, involving the reuse of process water to allow both the recapture of phosphates and the reduction of fresh groundwater extraction, will be completed in the first quarter of 2018, supporting an ambitious water reduction target of 5 percent in 2018 against 2017 usage.
♦ Geelong: Victoria, Australia
The Geelong site manufactures single super phosphate fertilisers, a process which requires much less water than ammonia manufacture. However, the site has been identified by the WBCSD Water Tool as being in a water catchment area which may experience water stress in the future (2025). The site obtains its water from the state government managed Barwon Region Water Corporation, Victoria's largest regional urban water management body. Barwon water is predominantly sourced from forested catchments on the upper Barwon and Moorabool rivers, but during periods of prolonged drought water is sourced from underground aquifers via the Barwon Downs and Anglesea bore fields. In extreme drought, the water management body can also access supply from the water grid of the City of Melbourne via the Melbourne to Geelong Pipeline, a 59-kilometre underground pipeline which is part of the state’s long-term plan to secure the region's water supply into the future. Water saving strategies at the site include the on-site capture, treatment and reuse of large volumes of stormwater, with 57,754 kL being treated and re-used this year. A complete water balance project for the site will be carried out in 2018 in order to identify potential water savings and opportunities to better manage waste water and stormwater.
♦ Mt Isa: Queensland, Australia
With an estimated population of 21,998 as at June 2016, the mining town of Mount Isa is the administrative, commercial and industrial centre for the state's vast north-western region. Our Mt Isa site manufactures sulphuric acid using waste sulphur obtained from a nearby metal ore mine. This process also uses less water than ammonia manufacture, however steam is also used at the site in the process of generating electricity from waste heat captured from the sulphuric acid making process. Water for the site is obtained through the Mount Isa Water Board which is responsible for the sustainable management of water supplies in the region. Although identified by the WBCSD Water Tool as being located in an arid area which may experience water stress in the future (2025), the Water Board manages supply using two man-made Lakes. Water is drawn mostly from Lake Moondarra (owned by a metal ore mining company, but transported by the Mt Isa Water Board) 13 kilometres downstream of Mt Isa, and pumped 60km up from Lake Julius in times of extreme drought to ensure supply is maintained. Water saving strategies at the site include the condensing of all steam used in our on-site electricity generation turbine and the returning of any blow down water from our cooling towers to the nearby metal ore mine as process water.
Bajool: Queensland, Australia
Our site at Bajool, Australia, manufactures explosives emulsions. Although identified by the WBCSD Water Tool as being in a water catchment area which may experience water stress in the future (2025), water supply is not considered a material issue at this site due to the low water usage required for emulsion manufacturing processes. Drinking water is delivered in bottles and all other water for the site, including amenities, is drawn from a small on-site bore under licence granted by the Queensland State Government.