New Directions in Bottom Ash Transport Water – Managing Limited or No Discharge Requirements

Lindy Johnson, Stantec
William Kennedy, Stantec

Description

This discussion will prepare the audience for future requirements for bottom ash transport water (BATW) closed-loop systems. The Environmental Protection Agency (EPA) previously restricted discharges of BATW in the 2020 effluent limitations guidelines (ELGs) to 10% of the primary wetted BATW system volume on a 30-day rolling average, with justifications documented in the Initial Certification Statement that the permittee prepared. The 2020 rule also contained an option to send BATW blowdown to the flue gas desulfurization (FGD) scrubber which converted BATW to FGD discharges. Now, EPA has proposed even more stringent limitations on discharges in the proposed 2023 ELGs – i.e., no discharge of BATW. In the proposed ELGs, EPA is also planning no discharge of FGD wastewater for the general case which could complicate compliance approaches. Stantec will discuss the status of the BATW ELGs and techniques for managing zero discharge of BATW. Storm event management, other flow segregation, complete recycle and treatment options will be presented. Stantec will also highlight the pitfalls and risks inherent in a no discharge regulatory landscape.

 
May 15th, 1:30 PM May 15th, 2:00 PM

New Directions in Bottom Ash Transport Water – Managing Limited or No Discharge Requirements

Grand Rapids, Michigan

This discussion will prepare the audience for future requirements for bottom ash transport water (BATW) closed-loop systems. The Environmental Protection Agency (EPA) previously restricted discharges of BATW in the 2020 effluent limitations guidelines (ELGs) to 10% of the primary wetted BATW system volume on a 30-day rolling average, with justifications documented in the Initial Certification Statement that the permittee prepared. The 2020 rule also contained an option to send BATW blowdown to the flue gas desulfurization (FGD) scrubber which converted BATW to FGD discharges. Now, EPA has proposed even more stringent limitations on discharges in the proposed 2023 ELGs – i.e., no discharge of BATW. In the proposed ELGs, EPA is also planning no discharge of FGD wastewater for the general case which could complicate compliance approaches. Stantec will discuss the status of the BATW ELGs and techniques for managing zero discharge of BATW. Storm event management, other flow segregation, complete recycle and treatment options will be presented. Stantec will also highlight the pitfalls and risks inherent in a no discharge regulatory landscape.