Tallman Island, New York City

Installed in 1996, this 10 MGD (million gallons per day) flow train of the 80 MGD plant was retrofitted with AccuWeb. The project was for enhanced nitrification in short-retention-time basins. Operation using IFAS (Integrated Fixed-film Activated Sludge) Technology did show improved nitrification. Especially significant is that the operating personnel documented the improved settling characteristics and reduced sludge production as the biggest benefits of adding AccuWeb to their activated sludge plant. The AccuWeb flow train is still performing with no maintenance required to date.

Greensboro, North Carolina

The 16 MGD North Buffalo Plant in Greensboro added AccuWeb to 1 of their 4 flow trains in 1997. The plant was not achieving its winter nitrification requirements. All flow trains had common return sludge. The additional biomass in the one train (due to the AccuWeb) improved nitrification in that stage by 24% over the other trains. The AccuWeb train also performed as a "seeding" device to improve overall plant nitrification, bringing the entire plant into winter ammonia level compliance. The system has required no maintenance since installation.

Environmental Center for Livestock Waste Management (ECLWM)
National Pingtung University, Taiwan

A two-stage AccuWeb system was installed at this animal waste treatment facility in 1999. The system is dsigned to treat 16,500 gpd of wastewater with influent BOD of 1830 mg/l. Following equalization, AccuWeb is the fixed-film media used in an anaerobic reactor, followed by AccuWeb in a SBR (sequencing batch reactor). The system has shown excellent results.

Mamaroneck, New York

AccuWeb was installed in a 3.5 MGD flow train of this 21 MGD plant in August 2001. The plant has deep above-ground tanks and no space to expand. The AccuWeb is in an MLE denitrification process configuration. The ability of fixed-film media to denitrify in the aerobic section of a nitrification plant will increase flow capacity, decrease the anoxic zone size requirement, and reduce recycle requirements. The design/engineering firm Hazen and Sawyer is operating the full-scale demonstration for two years during which time results will not be made public. The AccuWeb has required no maintenance since its installation.

This 1.43 MGD treatment plant was upgraded in August 2001 to denitrify using the MLE process. AccuWeb was added to increase the effective in-basin biomass and allow for nitrification/denitrification in the existing tankage. A brief performance demonstration was conducted during the coldest months (January and February). The demonstration measured effluent ammonia in two parallel trains, one with AccuWeb and one without. The weekly testing showed that the AccuWeb would remove approximately 100 lbs. more ammonia per day than the plant without fixed film media. After the testing period was completed, additional AccuWeb modules were installed at the plant. The only maintenance necessary to date was a 15 minute washdown of the media for odor prevention during basin dewatering for unrelated construction work.

AccuWeb was installed in one train of the Matthews 2-train packaged wastewater treatment system to evaluate the performance for winter nitrification. Installation was completed in this 30,000 gallon per day system in January of 2002. The evaluation is currently underway.

In March of 2002, AccuWeb was provided for a 25,000 gpd system designed by Weston and Sampson consulting engineers. This is a post-denitrification application in a simulated marsh for the Ashfield WWTP in Massachusetts. Methanol is introduced as a pure carbon source to promote denitrification using the fixed film media.

AccuWeb was provided to Aliment Breton Foods in June of 2002 and installed in their proprietary wastewater treatment system for a hog farm. The approximately 50,000 gpd system is designed to treat wastewater with influent BOD of 6000 mg/l. The system performance has exceeded its designed removals.

AccuWeb was installed in the anoxic and aerobic sections of one of the two existing circular package plants to increase the capacity of the plant for cold weather nitrification and denitrification. The 150,000 gpd unit will be used to demonstrate the IFAS process capability so the plant will be able to meet a new permit requiring nitrification and denitrification at wastewater temperatures as cold as 5°C. Installation of the seven frames was completed in August of 2002. No maintenance has been required on the AccuWeb.

In November of 2002, AccuWeb was installed in the Harbor Road WWTP in the city of Green Cove Springs, Florida as part of a plant upgrade to .75 MGD average flow. The upgrade also includes enhanced nitrification and denitrification. The upgrade of this circular package plant was designed by CDM and includes a new anoxic zone for nitrate removal and an expansion of the aerobic basin volume, in addition to the addition of fixed film media.