WE&T Magazine

WET_cover1_June13_90Water Environment & Technology (WE&T) is the premier magazine for the water quality field. WE&T provides information on what professionals demand: cutting-edge technologies, innovative solutions, operations and maintenance, regulatory and legislative impacts, and professional development.

 


June 2013, Vol. 25, No.6

Featured Articles

Who owns the rain?

Owns The Rain

Rainfall is a diffuse and natural resource that falls on all land surfaces as part of the hydrologic cycle. Harvesting rainwater is a physical process that requires landowners to manage the impacts on downstream users.  

In many cities, this practice is gaining new visibility as a means to control wet weather management needs and provide cost-effective, sustainable stormwater management solutions. However, water rights precedents and allocation practices can establish legal constraints that may limit the ability of property owners to harvest the rainwater that falls on their property.
 

 

When it rains, it pours

Rain Pours Accurate measurement of rainfall is a critical but often overlooked factor needed to evaluate the wet weather performance of sewer systems. Poorly performing or sparsely located rain gauges can result in significant uncertainty and error in evaluating sewers. By examining the best management practices that several organizations have developed to gather and use representative rainfall data, a technically based approach for rainfall measurements is revealed.

 

News

Effects to be determined

News Impact of sequester on U.S. wastewater treatment plants still being assessed. Read more

Coming in the next issue:
WET_cover1_July13_90

Nutrient removal

Controlling and removing nutrients is one of the prime regulatory drivers for water resource recovery facilities. Achieving these increasingly stringent nutrient concentrations to protect local waterways requires a combination of tools, planning, and hands-on experience. 

In Pennsylvania, a facility created a mechanistic model to test several different biological nutrient removal scenarios using an intermittent aeration process. By breaking down how operational changes would affect the process, the facility developed a powerful tool to optimize treatment. 

New limits also often mean new process — in the case of nitrogen limits, this process often is denitrification, which requires readily available carbon for bacterial conversion of nitrate to nitrogen gas. Read about the pros, cons, and safety requirements of using methanol as this additional carbon source. 

On the other side of the nutrient equation, find out what every operator should know about biological phosphorus removal in Operator Essentials. 

Also in this issue:    

  • A state of urgency. A New Mexico utility expanded a sewer pipe rating system to shift from simply repairing pipe segments to prioritizing and repairing the highest-risk segments before they failed.     
  • Combining two pump stations into one. An Ontario pump station design overcomes several challenges, including two extreme hydraulic duty points.   
  • “It’s like LEED for civil infrastructure.” The new ENVISION rating system provides users a way to measure the long-term benefits of up-front sustainability investments.