Make Money While Saving the World
Charles Peterson, Ahmed Mostafa, and Julie Godin
Carbon funds are designed to help reduce global emissions of greenhouse gases
Lowering greenhouse gas emissions not only is good for the environment, but it also may benefit an entity’s bottom line. A program established by the World Bank (Washington, D.C.) — carbon finance — can help defray the operating expenses of projects in developing countries that can prove they are reducing such emissions below the levels that would have occurred without the projects.
Lowering greenhouse gas emissions not only is good for the environment, but it also may benefit an entity’s bottom line. A program established by the World Bank (Washington, D.C.) — carbon finance — can help defray the operating expenses of projects in developing countries that can prove they are reducing such emissions below the levels that would have occurred without the projects. Read full article (login required)
Greening the Industrial Landscape
Shanghai petrochemical complex turns to constructed wetlands to improve environmental protection
China’s expanding industrial market has raised the question of how to allow for continued industrial expansion while protecting the environmental integrity of the landscape. The industrial community is investigating how to integrate the industrial landscape into the fabric of a quickly urbanizing nation. Key to this integration is reducing health and safety threats and environmental degradation.
Sweeter Than Ever
George C. Patrick, Kenneth D. Wandless, and James C. Young
After 19 years of continuous operation, an anaerobic treatment system used to pretreat a sweetener maker’s industrial wastewater was rehabilitated and returned to service as good as new
After operating its hybrid anaerobic treatment system continuously from 1984 to 2003, the NutraSweet Co. (NSC; Chicago) removed an anaerobic reactor from service to inspect and rehabilitate it. The project involved removing and replacing the media, removing and dewatering sludge, replacing the internal piping, and reseeding the reactor. Following its rehabilitation, the anaerobic reactor’s performance in terms of chemical oxygen demand (COD) removal increased from 63% before the shutdown to 93%.
Power (Recovery) Tool
Hugh Monteith, David Bagley, Youssouf Kalogo, Roy Ramani, and Lauren Fillmore
New tool helps professionals evaluate the cost-effectiveness of energy-recovery options
Solids treatment is an expensive process, and as energy costs rise, so does interest in processes that produce energy rather than simply consume it. Anaerobic digestion, for example, produces methane (biogas), which traditionally is flared (burned off) as a waste. Fewer than 20% of treatment plants currently convert their biogas into heat or energy, according to Opportunities for and Benefits of Combined Heat and Power Partnership (U.S. Environmental Protection Agency, April 2007). Such conversions, however, could help wastewater treatment plants meet or significantly reduce their own heat and energy needs.
Keys to Better Nitrification
Woodie Mark Muirhead and Ron Appleton
Incomplete reactions can lead to nitrite lock
When the nitrification process is controlled properly, nitrite–nitrogen seldom exceeds 1.0 mg/L. As soon as ammonia is oxidized to nitrite by ammonia-oxidizing bacteria (AOB), the nitrite is oxidized to nitrate by nitrite-oxidizing bacteria (NOB).
Nitrite will increase, however, under certain environmental conditions, such as a poorly established or inhibited NOB population. The NOB population may be poorly established during nitrification startup or inhibited because of environmental conditions — some of which operators can control.
This article details some of the causes and effects of nitrite lock.
WEFTEC.07 Equipment Finds
The exhibit floor at WEFTEC®.07 in San Diego featured 268,405 ft2 (24,934 m2) of exhibits and 1017 exhibitors. Attendees had the opportunity to see and learn about thousands of products. To find out what products and displays impressed you, we asked exhibition-goers to tell us what caught their eye and why. Read full article (login required)
Operations Forum Features
Operations Challenge 2007
WEFTEC®.07 in San Diego hosted the 20th annual Operations Challenge. The competition certainly has expanded since its first year when 22 teams from 15 member associations competed; this year 41 teams from 23 member associations fought for the title.
Consistency performances throughout the day earned the Commode Commandos from the Rocky Mountain Water Environment Association the Division I win and delivered the Division II trophy to the members of Force Maine from the New England Water Environment Association.
The coverage of the competition includes stories on the Division I and II winners, a listing of event winners, and a look at the history and evolution of Operations Challenge.
, review the
final point standings
, and check out an exclusive