East Donegal Township, Lancaster County, PA


Mount Joy Borough Authority


Utilizing existing structures design a biological nutrient removal (BNR) process for the wastewater treatment plant (WWTP).


Planning, design and construction management of WWTP BNR upgrade

BNR upgrade for Authority

Mount Joy Borough Authority’s wastewater treatment plant (WWTP) provides sewage treatment to Mount Joy Borough and portions of East Donegal, Mount Joy and Rapho Townships. In response to the nutrient removal requirements resulting from the Chesapeake Bay

Tributary Strategy, ARRO designed a biological nutrient removal (BNR) process for the WWTP.

BNR removes the total nitrogen and total phosphorus from wastewater through the use of microorganisms under different environmental conditions in the treatment process and reduces effluent total nitrogen to an average level of 8 to 10 mg/L and total phosphorous to an average of 1 to 3 mg/L before being discharged into receiving water.

ARRO worked with the Authority to select improvements that utilized existing structures and minimized the need for additional pumping infrastructure within the treatment process.  The BNR process improvements included modification of the WWTP's extended aeration process to incorporate a new fine bubble aeration system and control system that facilitates simultaneous nitrification and denitrification within the same tanks, and also included both secondary and tertiary treatment process upgrades. The WWTP's tertiary filters were also demolished and replaced with Siemens' denitrification filters. Additional improvements included upgrades to the WWTP's existing pumping and equalization facilities and the construction of a new ultraviolet disinfection and post-aeration system.

Because of the upgrades to the Authority's WWTP, the WWTP has demonstrated performance to within the effluent treatment limits resulting from the Chesapeake Bay Tributary Strategy.


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ARRO Consulting, Inc.
(717) 569-7021    108 W. Airport Road    Lititz, PA 17543