WE&T Magazine

WET_cover1_Nov14_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.

 


October 2014, Vol. 26, No.10

Featured Articles

Model extension gives BNR bugs a carbon-based boost

3 Andalib art

Recently, glycerin has drawn significant attention in the biological nutrient removal field as an alternative to alcohols (methanol and ethanol) and acetate as it is safer, noncorrosive, and nonflammable. Its price, biodegradability, high chemical oxygen demand (COD) value, and ability to promote nutrient removal behavior are all advantages. In addition, glycerin’s abundance in nature has led to microbial adaptations for its uptake and use as a source of carbon and energy.

However, its use in wastewater treatment is not as clearly defined as one might think. As a result, the design of glycerin-based supplemental carbon addition systems is hampered both by this uncertainty and the historical lack of fundamental mechanistic understanding.  

 

Traditional techniques, exceptional results

1 Khunjar art

Municipal water resource recovery facilities (WRRFs) are under increasing regulatory pressure to reduce effluent total nitrogen (TN) and total phosphorus (TP) to very low levels. Conventional technologies — such as enhanced nutrient removal and denitrification filters — often can reliably remove TN to 3 mg/L on an annual average basis.

 

Several WRRFs are achieving average effluent TN concentrations of less than 2.5 mg/L using only conventional technologies. Several factors contribute to their success. 

 

News

The best of both worlds

news1
Sioux Falls Water Reclamation Plant and South Dakota State University work together to solve problems in wastewater treatment.
 
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Coming in the next issue:
WET_cover1_Nov14_90

General assembly

Superlative water treatment requires good design and excellent operation. But the need for sound facilities — tanks, pipes, pumps, instruments, and so on — sometimes gets lost in the middle. The November issue examines different situations where choosing and building the right setup led to success. 

In one case, enclosing a stormwater canal required choosing the right type of construction to avoid a sinking feeling. During the installation of a 1500-mm (60-in.) reinforced concrete pipe, extreme settling buckled joints and caused visible separation. To fix the problem, the project team devised a “floating” reinforced-mat foundation. This mat foundation was composed of a layer of geotextile geogrid, cable, concrete, and coarse aggregates. 

In another case, a water resource recovery facility needed to enclose its biological nutrient removal tanks to avoid odor problems for neighbors. The options included fixed concrete or retractable-fabric covers. Both would capture the odors, but major differences in access to equipment and the ability to observe the processes in the tanks made all the difference. 

And finally, sometimes building materials and design can go beyond the bare essentials and help customers better appreciate their water resources. A continued public presence is rare for most water projects; most are located away from public viewing. Efforts are made to bury pipes, paint storage reservoirs to blend in with natural surroundings, and put up walls to keep away onlookers. However, a recent project in West Sacramento, Calif., embraced these valuable community water infrastructure elements as an educational outreach opportunity. Instead of a hidden liability, the project created a very visible asset and sought to convey the value of water and provide a continuous outreach opportunity. 

  

Also in this issue   

  • Operator essentials. What every operator needs to know about online nitrogen sensors for wastewater.   
  • Facilitating fees. How to avoid the pitfalls in setting stormwater utility fees while getting stakeholder support.   
  • A lawn to be proud of. New Mexico scientists mix drip irrigation, decentralized treatment, and fertigation to help produce lush turf in summer months.