West Michigan Construction Dewatering Removes PFAS And More

A construction dewatering project in a west Michigan city removes PFAS and other contaminants.

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Project

  • Construction Dewatering

Customer/Stakeholders

  • Environmental Engineering firm in west Michigan
  • Local city officials and government agencies.
  • Construction Firm providing excavation and utilities installation.

Profile

A city in west Michigan is relocating a 96” sewer main in preparation for future development in the area. The project consists of excavating surface streets to a depth of 25’ below grade. Widely varying volumes of water are seen daily. The project will be completed in several stages over a 6 to 7-month period.

Evoqua Water Technologies was contracted to provide a dewatering solution and connect directly to the well head located at the construction site. The dewatering aspect of the construction project controls the level of groundwater while mitigating contaminants and metals found in the groundwater.

The flow rate of the project averages 300gpm with a maximum capacity of 1200gpm. Each of the media vessels is filled with a proprietary low density granular activated carbon.

The contaminants being targeted include PFAS. Among the targeted volatile organic compounds (VOCs) are benzene, toluene, xylenes, methylene chloride and others. Evoqua’s media is also removing many types of metals including arsenic, barium, cadmium, lead and others. In addition, pH is a challenge due to significant fluctuations.

The treated effluent is being discharged into the city’s sanitary sewer system.case-study-midwest-pfas-2.jpg

Equipment

  • Media vessels
  • Bag Filtration to .5µm absolute
  • Frac Tanks providing equalization and solids settling.
  • UC1240LD activated carbon

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