Reuse Water between Businesses
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Reuse Water between Businesses

Compiled by:
Molly Danielsson (MDML, cewas – international water management services)

Industries require different qualities of water and other flow streams like chemicals, energy, nutrients, etc. These by-products can be traded in order to optimise each industry’s water and energy usage. This approach is often called industrial symbiosis. This term references ecological symbiosis when two or more organisms "live" together for mutual or one-sided benefit. In industrial symbiosis, traditionally separate industries engage in a long-term partnership to increase their competitive capacity by physically exchanging materials, energy, water, and/or by-products.

In Out

Precipitation, Freshwater, Drinking Water, Blackwater, Greywater, Fertigation Water, Treated Water, Energy

Blackwater, Greywater, Fertigation Water, Treated Water

Introduction

Reusing products (e.g. water) within different industries is often called industrial symbiosis. Industrial symbiosis is part of a new field called industrial ecology. Industrial ecology is principally concerned with the flow of materials and energy through systems at different scales, from products to factories and up to national and global levels. The keys to industrial symbiosis are collaboration (matching needs and openness) and the synergistic possibilities offered by geographic proximity. The three major opportunities for industrial symbiosis are:

This factsheet will cover opportunities in by-product reuse to optimise water use. Typical examples are the symbiosis of an industry producing heat and nitrogen rich wastewater with fish aquaculture or plant aquaculture.

Water use per sector worldwide. Source: COB (2009)

Water use per sector worldwide. Source: COB (2009)


Industry is the fourth largest consumer of water in the world (UNESCO 2009). Industry withdraws 5-10% of global water, ranging from 50% of national withdrawals for developed countries to 5% for developing nations (UNESCO 2009). The primary industrial uses of water are for energy (hydropower), cooling water (from power generation), process water (chemical processes, steam for direct drive power), products and waste disposal (washing) (WBCSD 2009). Industrial symbiosis has the potential to create closed loop processes that drastically alter the industrial process paradigm from extraction to renewal.

Industrial symbiosis can result in considerable environmental and economic benefits for participants, however recent studies in Yale's Journal of Industrial Ecology have found that the majority of benefits occur upstream and not at the plants themselves. Paper and pulp mills operating as industrial ‘symbionts’ had modest improvements in environmental impacts of 5-20% (SOKKA et al. 2010).                  

Water and By-Product Reuse

By-product reuse requires information sharing between firms about what each has to offer in order for firms to self organise. Firms also need assurance about the quality and consistency of the by-product. Biogas settlers may benefit from nutrient rich wastewater from another firm, while a plant or fish aquaculture might need to be promised that the water never contains certain toxins or organisms. By-product sharing must answer to the same concerns as traditional purchasing relationships: supply security, quality control and availability.

Examples of By-Products and their Reuse Opportunities

Examples of Water Reuse Opportunities

With appropriate controls, industrial water can be reused for many industrial processes, including the following:

Non-Industrial Water Reuse Opportunities

With appropriate controls, and where risks can be managed to an acceptable level, industrial water may potentially be reused for the following uses:

Wastewater Treatment Can Increase Reuse

To increase opportunities for reuse between firms treatment systems may be necessary. Collective management of wastewater treatment plants can lower costs for all participants.

Possible Treatments

Possible treatment options for water reuse include: waste stabilisation ponds, aerated ponds, trickling filters, vertical flow constructed wetland, hybrid constructed wetland, freesurface constructed wetland and horizontal flow constructed wetland.

Treatment options where biogas can be produced using anaerobic digestion: UASB reactors, biogas settlers or in large scale digesters.

Advanced (more high-tech options): activated sludge, MBRs, advanced oxidation processes, ozonation, activated carbon.

Share in Management of Utilities

Another form of industrial symbiosis can be simple utility sharing. For example, several firms could share a closed-loop solvent recovery programme collectively run or in cooperation with a local wastewater treatment service. Each firm may not use enough solvents to justify a system of solvent recovery, but several firms together can. Pulling solvents out of the waste stream reduces the wastewater treatment necessary and creates the potential for reuse (ASHTON 2008).

Share Ancillary Services

Industrial Ecosystem at Kalundborg, Denmark. Source: POLLUTION ISSUES (2010)

Industrial Ecosystem at Kalundborg, Denmark. Source: POLLUTION ISSUES (2010) 

Geographically close firms can save money and energy by sharing ancillary services like transportation, landscaping, waste collection, and emergency management. For example, companies could share reservoirs for storing water for industrial fire protection (ASHTON 2008). Examples:


 Entrance of the greenhouses and visitors centre in Wolhusen (Switzerland). The gas densification station is in the background. Source: SEECON (2012)

Entrance of the greenhouses and visitors centre in Wolhusen (Switzerland). The gas densification station is in the background. Source: SEECON (2012) 

Another example of industrial symbiosis is located in Switzerland. The Wolhusen Tropenhaus represents long-term cooperation between private and public enterprise. Waste heat from a nearby natural gas plant is run through a steam generator to produce energy for the greenhouse nearby. The waste heat from that process is used to heat a nearby hospital and to heat water for the greenhouse's aquaculture system. Currently the hospital and greenhouse use 40% of the natural gas plants waste heat.


Primarily, case studies of industrial symbiosis have come from regions with large-scale heavy industrial processes like Kwinana industrial area in Australia or Rotterdam harbour in the Netherlands (ASHTON 2008). However, small-scale agricultural businesses have also engaged in industrial symbiosis, like Montfort Boys Town in Fiji (ASHTON 2008). Many also exist that are not documented or advertised as such.

Applicability

Reusing water between industries is most applicable to industries that depend on water within close geographic proximity to each other. A high level of trust must be established in order for firms to work together. The sharing of open source information about the location and quantities of by-products generated has shown to dramatically increase the likelihood of industrial symbiotic relationships forming (DOYLE & PEARCE 2009).

Advantages

Disadvantages

References

ASHTON, W. (2008): Understanding the Organization of Industrial Ecosystems: A Social Network Approach. In: Journal of Industrial Ecology 12. URL [Accessed: 15.05.2012].

COB (Editor) (2009): Fresh Water Reserves and Water Use by Sector. Traverse City, MI: Circle of Blue (COB). URL [Accessed: 07.06.2012].

DOYLE, W.; PEARCE, J. M. (2009): Utilization of Virtual Globes for Open Source Industrial Symbiosis. In: Open Environmental Journal 3, 88-96. URL [Accessed: 15.05.2012].

CHERTOW, M. (2008): Industrial Symbiosis. The Encyclopaedia of Earth. URL [Accessed: 23.07.2010].

SOKKA, L.; LEHRORANTA, S.; NISSEINEN, A.; MELANEN, M. (2010): Analyzing the Environmental Benefits of Industrial Symbiosis. In: Journal of Industrial Ecology 15, 1. URL [Accessed: 19.11.2012].

UNESCO (Editor) (2009): Chapter 7: Evolution of Water Use. Water in a Changing World. (= The United Nations World Water Development Report 3). UNESCO and Earthscan. URL [Accessed: 19.11.2012].

WBCSD (Editor) (2009): Water Facts and Trends. (PPT Presentation). Geneva: World Business Council for Sustainable Development. URL [Accessed: 20.04.2010].

For further readings, case studies, awareness raising material, training material, important weblinks or the related powerpoint presentation, see www.sswm.info/category/implementation-tools/water-use/hardware/optimisation-water-use-industry/reuse-water-between