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Professional Bio for C. Robert L. Mangrum, PE., BCEE


  • Master of Science, Environmental Engineering, Virginia Polytechnic Institute and State University, 1998

  • Bachelor of Science, Civil Engineering Emphasis: Water and Wastewater Treatment, Clemson University, 1994


Professional Registration

  • Professional Engineer: Virginia, 2000, Florida, 2000


Specialty Certification

  • Board Certified Environmental Engineer (BCEE), in Water Supply and Wastewater Treatment by the American Academy of Environmental Engineers.Certification attained in 2003.


Recent Papers, Presentations and etc:

Governor's 2020 Gold Award for Environmental Excellence

Enhanced Biosolids Reuse & Reduction Project; Harrisonburg-Rockingham Regional Sewer Authority - Technical advisor to project and codigestion specialist.

WEF 2020 Biosolids Conference

Paper: The effect of divalent cation complexation on anaerobically digested EBPR sludge dewatering performance.

​Water Environment Research Journal

Mangrum, C.R.L., Jenkins, D. (2020) The effect of divalent cation complexation on anaerobically digested EBPR sludge dewatering performance. Water Environ. Res. 92, 677.


Recognition Awarded to the HRRSA Enhanced Biogas Reuse & Recovery Project for Performance and Innovation in the State Revolving Loan Fund Creating Environmental Success. Technical Advisor to project; Author of Facility Solids-Stream Master Plan.

WEF 2018 Biosolids Conference Phoenix, AZ 

Paper Presentation: Leveraging Codigestion for Municipal Biosolids Drying: Sustainable Goals - Proven Technology". (2018) Proc., Water Environ. Fed. Residuals and Biosolids Conf.

Relevant Project Experience:

Mangrum Consulting & Design (December 2015 – Current), Lynchburg Va

Established in 2015, Mangrum Consulting & Design was formed to provide specialty consulting engineering services to municipal wastewater clients based upon a unique blend of Rob's consulting experience that utilizes process-based analytical evaluations and collaborative problem-solving to produce customized holistic solutions.  Dr. David Jenkins has provided technical guidance and mentoring to Rob since 2009.

Wastewater - Key Experiences:

  • Developed operating protocols and provide on-going process support to optimize performance for a broad range of municipal 5-stage ENR facilities to robustly and cost effectively achieve Chesapeake Bay nutrient limits with capacities of: 23, 6.0, 4.6, 2.9, 0.9, 0.8, 0.7, & 0.2 MGD.

  • Conducted a liquid and solids-stream evaluation that culminated in up-rating liquid -stream capacity to 23 MGD and solids-stream capacity to 28 MGD.

  • Evaluated a high-rate anaerobic digestion process and developed operating protocols for codigesting high-strength industrial wastes at a municipal WWTP.

  • Biogas driven sludge dryer system – Owner’s technical agent.

  • Conducted a study to predict the formation of inorganic crystalline products within anaerobic digestion systems and implemented methods to minimize formation.

  • Pretreatment support and local limits development for multiple ENR treatment facilities.


Water - Key Experiences

  • Conversion of a 1.0 MGD conventional river water treatment facility to a 1.8 MGD membrane filtration plant – Owners Technical Agent.

Wiley|Wilson (July 2005 – Dec 2015), Lynchburg Va

Vice President, Water Resources/Civil Engineering  (Jan 2009 – Dec 2015)

Lynchburg Office Group Leader for Civil/Water Resources with 20 direct reports; Overall responsibility for business development, technical direction, project performance, project execution, mentoring, and employee development. Created a company wide young professional mentoring program for Alexandria, Richmond, Lynchburg and Atlanta offices.

CH2M (May 2000 - July 2005) – Project Manager (South Florida)

Project Manager and lead water/wastewater engineer for advanced water and wastewater treatment projects across Florida and Georgia. 

 Key Experiences:

  • Lead wastewater process engineer responsible for resolving a ten-year standoff to re-rate the George T. Lohmeyer WWTP from 42 to 56 MGD (City of Fort Lauderdale).

  • Project Manager for developing a CMOM for the City of Fort Lauderdale which reduced peak-flows at the WWTP by 25 MGD.

  • Designated as the Wastewater Market Segment Leader for Florida (Business Development and Technical).

  • Selected as the Project Manager for the high profile Palm Beach County Design-Build sludge dryer project in 2003.

  • Was invited and participated in the development of the newly created Environmental Module of the FE exam in 2002.

Parsons (May 1996 – May 2000) – Project Engineer (Fairfax Virginia)

Project Engineer and assistant PM on a wide range of advanced water and wastewater treatment upgrade projects. 


Olver Inc. (Jan 1995 – May 1996) – EIT (Blacksburg Virginia)

Upon graduating from Clemson with a BS degree in Civil Engineering in December 1994 a full-time consulting engineering position was taken in Blacksburg to gain valuable design experience while also going to graduate school at Virginia Tech.  The simultaneous combination of these two activities had a synergistic effect on learning both the technical aspects and the business perspectives of the consulting engineering industry. 

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