Find other useful and timely information on the TPO website

TPO aims to bring you stories that help you and your plant perform better. Now we do more of the same at There you’ll find stories that appear only online — and that are current, because they’re not subject to the lead times involved in the print magazine. Here are a few online exclusives recommended by the TPO editorial team:

Deep Bed Biofiltration the Answer to Very Low Nitrate Requirements

Nitrate remains a major concern for surface waters. Nitrate from fertilizers, wastewater treatment facilities and other sources can lead to hypertrophication and hypoxia in waters, resulting in fish kills and dead zones. Today, treatment plants are looking to sand filtration for added nitrogen removal after clarification. This tertiary filtration may be the final treatment before disinfection, or a pretreatment step for an advanced process, such as microfiltration. In either case, sand filtration can reduce nitrate to well below 1 mg/L.

Program Offers Multi-Faceted Learning With Training Laboratory

Mike Smith’s enthusiasm for the Water Quality Management program at Red Rocks Community College is contagious. And his pride in the curriculum he’s helped build is clearly justified. Located in Lakewood, Colo., the college is one of the most extensive water quality management programs in the nation with a 35-foot enclosed mobile laboratory. “There’s really no other institution with anywhere near the offerings we have,” says Smith, department chair, program coordinator and lead faculty. “And we have a vision to do more to expand our offerings and make our programs even more successful.”

Water Technology Company Sponsors 2013 Bay State Children’s Water Festival

To help educate youth about water and its critical role in sustaining the earth, Xylem was a platinum level sponsor for the Bay State Children’s Water Festival on June 6 at Holyoke Community College in Massachusetts. The festival was hosted by the Water Systems Council, a nonprofit organization that works to educate stakeholders, including well owners, community leaders, elected officials, and government agencies, about the importance of protecting our groundwater resources. The event gave 1,500 fifth graders hands-on exposure to water-related topics.

Modified Settleability Test for Activated Sludge Treatment

One of the tried and true process control tests of the activated sludge treatment method, the settleability test, has become an operator’s best friend. The 2-liter, wide-mouth container widely known as the settleometer is a piece of equipment plant operators rely on almost every day. A settleability test provides information about the settling characteristics of the biomass and the potential quality of the clarifier effluent. This article looks at the basic settleability test and sheds light on a variation called the diluted settleability test.


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