Wastewater Treatment

ASSIST Consultants Inc. (ACI) engineers have designed wastewater treatment facilities for a wide range of sizes and capacities. Our experience encompasses sewer collection systems, advanced wastewater treatment facilities, residuals management and handling, odor control and air pollution and water reuse. We have significant expertise in all facets of wastewater liquid stream and solids stream treatment ranging from conventional plants for organic removals to complex nutrient removal/resource recovery processes covering scopes from compliance evaluations to turnkey delivery of completely operational facilities.

Regulatory Requirements, Planning and Permitting

Through effective and efficient project planning, ASSIST Consultants Inc. (ACI) experts provide comprehensive services and expertise in regulatory requirements, planning and permitting to ensure project success, with services including:

  • Wastewater and biosolids system master planning
  • Local, state and federal regulatory compliance strategy
  • Economic and rate studies
  • Public outreach

Treatment Technologies

As one of the leading wastewater treatment companies, we are at the forefront in the application of treatment technologies, including:

  • Preliminary treatment
  • Primary and secondary treatment
  • Tertiary treatment/disinfection
  • Treatment technology
  • Biological nutrient removal
  • Real time control
  • Advanced biosolids treatment
  • Resource recovery
  • Energy generation

Preliminary and Detailed Wastewater Treatment Design

Our multi-disciplinary design team blends expertise and proven reputation for innovative, quality wastewater treatment facility design projects, including:

  • Process engineering and design for liquid and solids treatment systems
  • Treatment system design support (Preliminary Engineering Reports)
  • Civil, electrical, mechanical, chemical, instrumentation and control, geotechnical, structural, architectural engineering and design, technical specifications
  • Technical, economic and financial feasibility studies
  • Treatment process modeling and simulation software studies
  • Bench-, pilot- and demonstration-scale studies
  • Existing wastewater treatment plant upgrades
  • QA/QC & value engineering

Process Modeling

Using state-of-the-art process models, we provide optimized solutions to address a wide range of issues, including:

  • Biological treatment
  • Chemical addition systems
  • Wet weather treatment
  • Odor source and dispersion
  • Computational fluid dynamics
  • Data inventory, analysis and management
  • Energy management
  • Resource recovery
  • Carbon inventory and emissions


ASSIST Consultants Inc. (ACI) expertise runs the full lifecycle of a project, including partnering with our clients to determine best practices for operations, including:

  • Plant operations and optimization
  • Operator training
  • Process start-up and commissioning
  • Equipment analysis and evaluation
  • Best treatment practices