Water 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.
Model extension gives BNR bugs a carbon-based boost
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
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.
The best of both worlds
Falls Water Reclamation Plant and South Dakota State University work together
to solve problems in wastewater treatment.
Coming in the next issue:
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.
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.
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.
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
in this issue
What every operator
needs to know about online nitrogen sensors for wastewater.
How to avoid the pitfalls
in setting stormwater utility fees while getting stakeholder support.
A lawn to be proud
New Mexico scientists mix drip irrigation, decentralized treatment, and
fertigation to help produce lush turf in summer months.