23563 West Main Street, IL Route 126
Plainfield, IL 60544
Tel: (815) 609-2000
Fax: (815) 609-2044
Mining operations and other energy producers face a multitude of clean-water regulations that can seriously impact their businesses. Strict standards governing discharge into waterways can increase costs and inhibit production. Veolia Water Solutions & Technologies is addressing these issues through advanced treatment processes that allow companies to generate clean water for reuse or environmental discharge with no substantial liquid waste.
Veolia offers the ZLW technologies through Design-Build and Design-Build-Operate contracts.
Called the Zero Liquid Waste (ZLW) approach, the industrial water desalination technology benefits the mining industry, which must contend with stringent new regulatory requirements that limit the discharge of chlorides and sulfates into streams, rivers, lakes and other bodies of water. Such discharges are a byproduct of the mining process, and mitigating their effect on the environment is crucial to the mining company's ability to produce cost-efficient energy.
"The Zero Liquid Waste approach is a big step forward for industries seeking to meet challenging new environmental regulations in a cost-effective manner," said Robert Zick, Mining Market Director of Veolia Water Solutions & Technologies North America. "Mining and energy companies are turning to us for innovative solutions to their water quality needs."
The Zero Liquid Waste approach features state-of-the-art membrane treatment to achieve discharge criteria, as well as Veolia's HPD® evaporation and crystallization technology to manage the brine from the water treatment process. The desalination system creates clean water for discharge while generating zero liquid waste. The resulting desalinated water can be used for various energy-production endeavors or discharged back into waterways, with the high-quality water benefiting downstream users.
Veolia's MULTIFLO™ softening technology is offered as packaged units or as field-erected tanks for larger flow rates.
ZLW consists of a raw-water pretreatment system, reverse osmosis (RO) membrane system, brine management system and ancillary support systems. Here's a look at how this state-of-the-art process works:
The raw-water pretreatment system involves pumping water into a raw-feed water tank with a jet mixing grid to prevent solids from settling. From there, the water enters the first of two aeration tanks that promote the precipitation of dissolved metals, such as manganese and iron, then into a crystallization tank where chemical softening takes place to reduce alkalinity and hardness. Veolia's MULTIFLO™ softening process provides a small footprint option for this treatment step.
The MULTIFLO™ system combines softening and clarification by including the company's Turbomix™ technology, which provides thorough draft-tube mixing to minimize chemical use and promote formation of a crystalline sludge that is easily dewatered in a filter press. The water is then conveyed to an aluminum precipitation tank where acid is added to neutralize the water's pH level and precipitate dissolved aluminum for removal in the subsequent filtration step.
The aluminum precipitation tank overflows into an adjacent multimedia filter feed tank and is pumped through vertical multimedia filters to remove residual suspended solids.
Reverse osmosis skids desalinate
the mine water, enabling the ZLW system to meet
limits for total dissolved solids, chlorides and
Veolia's HPD® evaporation and crystallization technology enables the mine water treatment system to achieve Zero Liquid Waste.
Both the solid waste from the centrifuges and the dewatered sludge generated from the two softening processes pass the paint filter test to meet landfill requirements. This means no liquid waste leaves the client's property. In addition, the discharged water improves the quality of water in the receiving stream, a major environmental benefit.
The ZLW approach is available through Design-Build and Design-Build-Operate contracts.When Operations are included with the agreement, the process guarantee is extended through the life of the operating contract. This ensures operational efficiencies, including high system availability, long-term operational life and minimal downtime for maintenance, among other advantages. More importantly, the system promotes responsible environmental stewardship and sets a new standard for water treatment in the mining industry.
Such support is another example of how Veolia Water Solutions & Technologies applies its portfolio of 350 proprietary technologies to deliver patented processes, standardized products, packaged systems and engineered solutions to a range of industries.
For additional information, contact Bob Zick, Mining Market Director, Veolia Water Solutions & Technologies North America at 412-809-6688 or Robert.Zick@veoliawater.com.