Wastewater Discharge Technologies by B&W Environmental

Effluent Guidelines and Standards for Power Plant Wastewater Discharge

In 2015, the U.S. EPA finalized effluent guidelines and standards for wastewater discharge from steam electric power plants to limit the levels of toxic metals in discharged wastewater. The rule impacts wastewater streams from flue gas desulfurization (FGD), fly ash, bottom ash and other processes and byproducts. The agency periodically reviews and updates the Effluent Guidelines Program Plan, identifying existing industries selected for regulatory revisions and new industries identified for regulation. The Plan provides a rulemaking schedule for any such activities.
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Spray Drying Technology for Zero Liquid Discharge

B&W offers advanced spray drying technology to meet zero liquid discharge (ZLD) requirements. Using the sensible heat of a flue gas, our patented spray drying technology is designed to reduce and/or eliminate liquid waste streams from a variety of sources.

Spray drying is a mature technology that was developed over a century ago and has been successfully utilized in coal-fired power generation applications for more than 40 years to remove SO2 from flue gas. B&W experience is backed by ZLD spray dryer installations from various industries including waste-to-energy, glass, hazardous chemical waste, and sewage sludge incineration.

GEA Niro, B&W’s partner in spray drying, has many worldwide installations across extensive spray drying applications, including dairy and food, pharmaceutical, and chemical products.

Potential benefits:

  • Elimination of wet FGD wastewater discharge
  • May allow more time for implementation per Effluent Limitation Guidelines (ELG)
  • Simple process requires limited operator attention while maintaining high reliability
  • Designed for improved material handling

Applications for spray drying technology:

  • Spray dryer absorber (SDA) flue gas desulfurization (FGD) for coal, oil, and high-chloride fuels (e.g., municipal solid waste)
  • Elimination of wastewater from wet FGDs (ZLD)
  • Evaporation of existing ponds
  • Evaporation of cooling tower blow down
  • Evaporation of other liquid effluent or waste streams

 Spray dryer advantages:

  • High reliability
  • Familiar and proven equipment
  • B&W experience with approximately 17 GW of SDA installations
  • Carbon steel construction
  • Simple operation
  • Tolerant of varying effluent compositions
  • Can be used in combination with other volume reduction technologies

Spray Drying Brochure Cover Image

Learn more in the Spray Drying Technology for Zero Liquid Discharge Brochure.

Zero Liquid Discharge

Spray Dry Atomizer Photo
The heart of B&W’s spray dryer is the GEA Niro rotary atomizer, featuring low maintenance, high availability and long life.

salt drying technology for zero liquid discharge

Project / Case Feature Item

B&W presents a paper on Salt Drying at the International Water Conference 2016.

New Build

Babcock & Wilcox (B&W) projects, new build
We consistently demonstrate the ability to successfully execute innovative solutions for our customers, from new equipment to large, complex full-scope engineering and construction projects.

Upgrades / Retrofits

Upgrades and Retrofits by B&W
Modifying, improving and maintaining existing equipment are vital considerations for the long-term viability and profitability of all operations.

Parts / Services

Babcock & Wilcox Parts and Service Support
An extensive network of worldwide regional service centers, field service engineers and technical support personnel are available to provide the customized service and aftermarket solutions for your requirements.