Problem: A small but fast-growing city in New Jersey needed to expand its wastewater treatment plant capacity. One requirement was to keep the existing plant in service during construction. The design also had to consider a limited budget based on state revolving fund financing. Site limitations did not allow for an additional activated sludge train.

Solution: The client, consultant and Headworks International chose an integrated fixed film activated sludge process, which reduced the tank footprint by 50%. The moving bed bioreactor media shortened retention time by half so reduced the reactor load dramatically.

Result: The dramatically reduced retention time delivered the needed capacity increase within the space limitations. The system also produces less biosolids, reducing costs greatly. 713-647-6667; www.headworksintl.com