CRRA Impingement & Entrainment Studies

Project Name: CRRA Resource Recovery Facility

Summary: Impingement and entrainment studies

Client: Connecticut Resource Recovery Authority

Project Location: Hartford, CT

Project Size: 68.5 MW

Services Provided:

•  Impingement, Entrainment
    & Mortality Studies

Project Timeframe: 2005 - 2008

Relationship with Client: Since 2005

Client Needs:
The CRRA facility is a 68.5 MW refuse burning station located on the Connecticut River in Hartford. The plant currently uses two cooling water intakes to service the active generating units. Historically impingement studies had been conducted at the site. However, new impingement and entrainment (I&E) data reflective of current conditions in the Connecticut River were warranted to estimate current I&E impacts as required for compliance with the Clean Water Act.
Kleinschmidt Solution:
Kleinschmidt was contracted to conduct biological studies, including an investigation of impingement and entrainment monitoring as well as source water ichthyoplankton sampling in the Connecticut River. In addition, Kleinschmidt conducted studies to determine the potential impacts due to reimpingement at the site. Upon the culmination of biological studies, data were analyzed to generate an estimation of I&E impacts as a result of station operation. Kleinschmidt also performed a detailed evaluation of alternative technologies and operational measures available for reducing I&E impacts. Recirculation concepts, as well as technology upgrades for use with the existing once-through cooling systems were investigated. Each option included a feasibility analysis as well as an estimate of potential I&E impact reduction.
Client Benefits:
Kleinschmidt’s Technology Assessment included a cost-benefit analysis demonstrating the cost for any technology upgrade would be disproportional to any added benefits which convinced the regulators to allowed CRRA to reduce their required ichthyoplankton sampling from two years to one year, providing a large cost savings.