Staff Process Engineer – Aeration & Emissions (I-FLOAT ®)

Carollo Engineers is an internationally recognized environmental engineering firm specializing in the planning, design, and construction of water and wastewater facilities. Carollo’s Water Applied Research Center (Water ARC®) provides nationwide, process-based research and applied engineering expertise for municipal and private-sector clients across drinking water, wastewater, reuse, and infrastructure applications. Water ARC® services span laboratory and field-based testing, pilot and demonstration studies, and the development of innovative tools that bridge research and consulting practice. More information can be found here:https://carollo.com/innovation/water-applied-research-center/.

Carollo is seeking a staff- to mid-level Process Engineer whose role will be split between leading Water ARC® initiatives—primarily the I-FLOAT® off-gas testing program and supporting wastewater process engineering consulting projects across the firm. Approximately 50–60% of this position will be dedicated to applied research activities, with a strong emphasis on leading and growing the I-FLOAT® program and field-based testing. The remaining 40–50% of the role will support a variety of wastewater process engineering and consulting efforts, depending on business needs and the individual’s expertise.

I-FLOAT®, developed within Water ARC®, is Carollo’s internally developed off-gas testing solution designed to lower the logistical and cost barriers associated with off-gas testing, enabling broader deployment across WRRFs. Through I-FLOAT®, Carollo is expanding the industry’s ability to quantify real-world oxygen transfer performance and emissions (e.g., N₂O, CO₂), improve aeration design and operation, and support emerging needs related to quantify greenhouse gas emissions factors. More information can be found here: https://carollo.com/innovation/i-float/.

At Carollo, you will work alongside a collaborative and technically driven team that is passionate about advancing the state of practice in wastewater treatment. This role offers a unique opportunity to combine hands-on field testing, data interpretation, team leadership, and client engagement while helping shape a growing national program.

Water ARC® and I-FLOAT® Responsibilities (≈50–60%)

• Serve as a technical lead for Carollo’s I-FLOAT® off-gas testing program within Water ARC®, supporting aeration performance and emissions characterization studies nationwide.
• Lead multiple off-gas testing studies, varying in scale, complexity, and duration.
• Coordinate with utility staff, internal project managers, and engineering teams.
• Perform and oversee QA/QC of off-gas data collection, including sensor validation, calibration review, data screening, and documentation.
• Analyze and interpret process emissions data, translating results into engineering-relevant metrics such as oxygen transfer efficiency, aeration performance, and greenhouse gas emissions.
• Develop, refine, and standardize off-gas testing protocols, workflows, and best practices.
• Contribute to applied research efforts, including internal R&D, conference abstracts, technical papers, and industry presentations.
• Support Carollo’s broader emissions and aeration initiatives by helping advance methodologies related to greenhouse gas monitoring and performance-based aeration evaluation.

Wastewater Process Engineering and Consulting Responsibilities (≈40–50%)

• Support wastewater process engineering consulting projects across Carollo, including studies related to nutrient removal, capacity assessments, and master planning.
• Support process modeling and simulation efforts using tools such as BioWin, SUMO, GPS-X, or similar platforms to support planning, preliminary design, and optimization efforts.
• Prepare technical memoranda and reports documenting study findings, assumptions, modeling results, and engineering recommendations.
• Apply field data, performance testing results, and applied research outcomes to inform process evaluations and design decisions.
• Support applied research projects under the Carollo Research Group, as needed, beyond I-FLOAT-specific initiatives.
• Collaborate with multidisciplinary project teams to support project delivery and client needs across the company.

• Master’s degree (required) in one of the following or related fields:
  • Environmental, civil, or chemical engineering
  • Environmental or applied engineering sciences
• 1–4 years of experience in wastewater treatment process engineering, with demonstrated experience related to aeration systems.
• Strong understanding of activated sludge processes, aeration fundamentals, and gas-liquid transfer concepts.
• Background in gas-transfer processes or wastewater-related greenhouse gas emissions.
• Familiarity with process modeling, aeration control strategies, or energy optimization.
• Hands-on experience with field data collection, instrumentation, and QA/QC procedures.
• Demonstrated ability to analyze and interpret complex datasets and translate results into practical engineering insights.
• Experience working directly with clients and internal project teams.
• Ability to manage multiple concurrent efforts in a dynamic, field-oriented environment.
• Willingness to travel approximately 20–30% for site testing, meetings, and conferences.

• PhD (preferred) in environmental, civil, or chemical engineering.
• Direct experience with off-gas testing, oxygen transfer efficiency testing, or aeration performance evaluations.
• Experience leading small technical teams or task groups.
• Registered Professional Engineer (PE), State of California

$80,000 to $90,000 annually. This is the lowest to highest salary we in good faith believe we would pay for this role at the time of this posting. We may ultimately pay more or less than the posted range, and the range may be modified in the future. An employee’s pay within the salary range will be based on several factors including, but limited to, relevant education, qualifications, certifications, experience, skills, seniority, geographic location, performance, and business or organizational needs.

Carollo is committed to providing employees with a competitive, comprehensive benefits program that provides the care employees and their families need to lead healthy, productive lives. Carollo’s benefits package includes paid time off and holidays, comprehensive health insurance coverage, pre-tax savings account options for healthcare, dependent care and commuter expenses, disability insurance and life insurance options for you and your dependents. We also offer free Caregiver Support, Travel Assistance, counseling services and discount programs. Other compensation that may be available includes: 401(k) company contribution matching, tuition reimbursement, discretionary bonuses, career advancement bonuses, professional registration bonuses, employee referral bonuses, and compensatory time for exempt employees. Flexible work arrangements may also be available. Eligibility for benefits varies based on employment status.

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