Wastewater Treatment Plant Expansion
Brownsburg, Indiana

Water treatment plant capacity limitations compounded by rapid commercial, industrial and residential development prompted the Town of Brownsburg to undertake a major expansion for its treatment plant. Construction for the plant expansion started in the Fall of 1999 and was completed December 2000.

When the original wastewater treatment plant was planned in the early 1980's, it was recognized that Brownsburg enjoyed a favorable location and could expect rapid future growth. The design easily facilitated expansion by the construction of a mirrored image of the original plant.

New commercial, industrial and residential development, compounded by wastewater treatment plant capacity limits, prompted the Town to move forward and construct the expansion that was envisioned in the original design.

During 1996 and 1997, flows to the plant averaged 2.08 mgd, almost 87% of the existing plant's capacity, with extended periods exceeding the design. This project increases the plant capacity from 2.4 mgd to 3.5 mgd (annual average) and from 7.2 mgd to 8.8 mgd (peak hydraulic).

After the expansion, with only three ditches and clarifiers on-line, a peak flow of 9.0 mgd was recorded on October 5th without any operational problems. The additional ditches and clarifiers have provided the plant with much needed capacity to meet current and future needs.

Sound planning and attractive financing have provided the community with a cost-effective wastewater treatment plant that enhances White Lick Creek and allows for residential and industrial development over the next 20 years.

Brownsburg used the State Revolving Fund Loan Program to finance the $6.5 million of capital improvements. The below-market interest rate will save the Town more than $1.8 million throughout the life of the loan.

All work was accomplished with the existing facilities in operation, allowing for minimal shutdowns during construction. With the new facilities on-line, the Town has been able to remove existing equipment from service for maintenance. The new facilities include:

  • Influent splitter box
  • Conditioner tank
  • Two oxidation ditches
  • Two final clarifiers
  • Dechlorination facilities
  • Two aerobic digester tanks
  • Sludge pumping vault
  • Sludge pumping equipment
  • New sludge thickener building
  • Mechanical sludge thickening/dewatering equipment
  • Modifications of the air distribution equipment in the biosolids storage tanks
  • Dewatered sludge storage facilities

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