PRD Tech, Inc. products

In recent years, there is growing public awareness of odors from waste water treatment plants, which mainly stems from the following observed trends: The public is less tolerant of objectionable odors from waste water treatment plants; Many waste water treatment plants have seen residential, commercial, or other developments established near the facility boundaries and fence lines, thereby increasing the population being affected by the odor emissions; Plants are treating increased flows, servicing distant locations, which has increased the age of the waste water, and hence its septicity and concentration of reduced sulfur and nitrogen compounds; Water conservation efforts have resulted in reduced waste water flows and increased waste water strength; which increases odor production; and New or modified waste solids processing systems have created additional odor sources.

Limiting hazardous air pollutants (HAPs) emission from industrial operations and waste treatment facilities became a national priority in 1990 with passage of the Clean Air Act amendments. The trend towards stricter air emissions regulation is spreading throughout the world, leading to developments such as biofiltration for effective air treatment. Biotrickling filters are a recent addition to the list of alternatives. These filters use synthetic materials, rather than organic, with active bacteria immobilized on the surface as biofilms.