I D
× COMMENTARYCOVER STORYIN THE NEWSCHEMENTATOR + Show More BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILESOLIDS PROCESSINGENGINEERING PRACTICEENVIRONMENTAL MANAGEREQUIPMENT & SERVICESFOCUS
Focus on Valves
    A new motorized control valve for the semiconductor…
NEW PRODUCTS + Show More

Comment PDF Water Treatment

Cooling Towers: Managing Tighter Water-Discharge Regulations

By Brad Buecker Kiewit Power Engineers |

Historically, many large industrial facilities, including power plants, have relied on once-through cooling, in which the entire cooling water volume flows through the plant heat exchangers and then is discharged to the original source. However, the U.S. Environmental Protection Agency (EPA; Washington, D.C.) has, for over a decade, been developing regulations to protect aquatic life from impingement and entrapment at once-through cooling intakes. This development has essentially eliminated once-through cooling as an option at new plants. Rather, cooling towers now tend to be the preferred choice, with air-cooled condensers increasing in popularity.   Cooling tower blowdown Subsequent to the passage of the Clean Water Act in the late 1960s, EPA began controlling industrial plant wastewater discharges per the National Pollutant Discharge Elimination System (NPDES) guidelines. In many cases, NPDES guidelines focused on a small core of primary impurities in wastewater discharge streams. The two most common for cooling water were pH (typical pH control range of 6.0 to 9.0) and residual oxidizing biocide at a common limit of 0.2 parts per million (PPM). These guidelines, or perhaps even more stringent limits, are still in place at…
Related Content
WEFTEC Show Preview
Presented by The Water Environment Federation (Alexandria, Va.; www.wef.org), the Weftec 2016 conference and exhibition will take place Sept. 24–28…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Metering gas in biogas plants
Wet process analyzer for FPD and solar cell manufacturing for semi-conductors
Fluidized bed drying and cooling for temperature-sensitive polymers and plastics
CoriolisMaster: The SmartSensor solution
The Big 6 flowmeter technologies: Where to use them and why

View More