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.
Spreading the wealth
recovery programs at water resource recovery facilities (WRRFs) are greatly
increasing biogas production and electricity generation for those facilities
accepting high-strength organic wastes — such as fats, oils, grease, or food
waste — in their digesters. In some cases, the increased generation may exceed
the demand required to serve onsite load, resulting in surplus power that may
be sold to buyers for a “green premium.”
During the deluge
it rains, it pours into many places, including wastewater systems. Older
systems in the East and Midwest may include combined sewer areas where
stormwater runoff is captured intentionally. However, areas with separate
sanitary sewers also feel the effects of heavy rain.
of the most important types of information for operators is the level of
wastewater at various points in the collection and conveyance piping and
structures. Several types of devices provide real-time level measurements in
collection and conveyance systems, but the pulsed ultrasonic level meter
probably is the most common. These are time-tested and reliable devices, but
their behavior when the system is stressed heavily and the meters are
underwater should be understood.
The incredible growing ‘fatberg’
might think that the headline-grabbing discovery of a foul-smelling, 13.6-Mg
(15-ton) “fatberg” in a London sewer tunnel this past July might persuade
locals to rethink where and how they dispose of their used cooking grease and
nonflushable wet wipes.
just 6 weeks after an eight-member crew worked day and night to dislodge the
bus-sized blob, tons of fresh fat were found oozing from the same sewer,
according to a release from Thames Water (Reading, U.K.), the city’s water and
Coming in the next issue:
the key to moving forward is stepping back to look at a situation as a whole. A
bit of perspective can help to reveal pathways to great efficiency and
sustainability. This is especially true in the case of biosolids, where
adherence to strict regulations can stifle a broader viewpoint.
example, something as simple as choosing the proper settling vessel for sludge
volume index testing can affect the process by giving varying accuracies of
solids settling performance. In “Better data for clarifiers,” the authors
develop solids flux curves for a particular facility using 1-L graduated
cylinders, 1-L beakers, 2-L settleometers, 2-L square beakers, and 4-L
graduated cylinders. They then compare those curves with curves developed using
empirical models to determine which models were better in predicting clarifier
performance. Small changes lead to better data.
back even further, Bowling Green, Ky., planned a complete overhaul of its
biosolids handling practices in coordination with a treatment facility upgrade.
Last summer the new sequencing batch reactor water resource recovery facility
began operation, as did a new indirect thermal biosolids drying process. The
new process generates a Class A that is being sold to local farmers. The switch
from the old to the new process is saving the facility more than $22,000 per
an even more overarching switch, Dayton, Ohio, took action to bring its biosolids
processing back under city control. The city conducted a benefit-cost
evaluation to determine the 15-year life-cycle costs across a series of
biosolids handling alternatives and used its best asset — its employees — to
in this issue
Congrats to Terminal Velocity and Team HRSD from the Virginia Water Environment
Association for earning top honors overall in Divisions 1 and 2, respectively.
Highlights of WEFTEC 2013 in Chicago.
Echo Park Lake
Stormwater rehabilitation gives Los Angeles lake fans reasons to rejoice.
bioreactor helps seafood manufacturer meet regulatory requirements.