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AWWA ACE69134
- It Was Serendipity: A Case Study of Residuals Handling at the Ridley Creek Water Treatment Plant
- Conference Proceeding by American Water Works Association, 11/01/2008
- Publisher: AWWA
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This paper describes Aqua Pennsylvania's successful search for aresiduals handling solution at an 8-MGD water treatment plant (WTP) in suburbanPhiladelphia. The paper provides background on this 150-plus year old treatment facility and describesthe need for changes to its existing residuals practices. It documents the alternativesevaluated and the unsuccessful attempt to implement Aqua's "first choice" solution. The eventual solution became a collaborative effort between the WTP and a nearby sewagetreatment plant (STP). The STP utilizes a belt filter press (Press) to dewater its biosolids,and it was determined that there was sufficient excess capacity to dewater the WTP residualsas well as the biosolids using the same Press. The paper explores significant issues on the regulatory, business, and operational fronts that came up while working with two different wastes and two different utilities. Several unique features of the design are summarized,particularly, sequential batch thickening. The paper presents owner issues andfactors in decision-making, along with technical design aspects and performance and costs of the residuals handling facilities that have been in operation since 2003. Finally, the paper describes how the residuals helped the STP's biosolids meet permit requirements. Includes reference.
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