In the modern world of wastewater treatment, control of odors has moved from an afterthought to a primary design consideration for most collection and treatment facilities. As development encroaches on our facilities and our new neighbors become less tolerant of nuisance odors, wastewater professionals have found the need to address odor as a primary concern in the design and operation of collection and treatment facilities. As the attention paid to odor control has increased, so has the number of odor control technologies that are available in the marketplace.
Municipals have always used the conventional dosing method of one constant rate pump feeding the same rate 24 hours a day. At some sites a second timer controlled pump will be utilized to increase the dose rate during peak flow periods. Like most other wastewater systems they have always been able to achieve adequate levels of odor control utilizing this method. However, as with many other wastewater systems, increases in the size of their collection system and increases in chemical prices have inflated their chemical budgets to the point where they are now looking for alternative technologies to provide effective odor control in a more cost effective manner. One of the new technologies they have evaluated is the AWS Automated Dosing System, a proprietary, patent pending system which applies odor control chemicals in response to the system demand rather than at a continuous set dose rate.