1166386 - Modeling of Hydrogen Sulfide Generation and Rates of Microbially Induced Concrete Corrosion in Manhole Shafts

Thursday, June 30, 2022

10:00am – 10:20am PT

Location: Seacliff D

Presenting Author(s)

Ketan Shah, BE, MBA-TM

Graduate Research Assistant
The University of Texas at Arlington
Arlington, Texas

Primary Author(s)

Sunakshi Hada, PhD

Condition Assessment Engineer
Black & Veatch Corporation
Phoenix, AZ

PDF Slides

Co-Author(s)

Melanie L. Sattler, PhD, P.E.

Professor
Univ of Texas-Arlington
Arlington, TX
Victoria C. P Chen, PhD

Professor & Director
The University of Texas at Arlington
Arlington, TX
Arpita Bhatt, PhD

Assistant Professor of Instructions
UT Arlington
Arlington, TX
Niloofar Parsaeifard, PhD

Assistant Professor of Instruction
University of Texas at Arlington
Arlington, TX
Gomathy Radhakrishna Iyer, PhD

Staff Professional
SCS Engineers
Reston, Virginia
MR

Mohammad Rafatuzzama
Aiswarya Acharath Mohanakrishnan, MS

PhD Candidate
University of Texas,Arlington
Arlington, TX
Mithila Chakraborty, MSc

Graduate (PhD) Student
The University of Texas at Arlington
Bronx, NY
HR

Hoda Rahimi, Doctorate

Researcher
Univeristy of Texas at Arlington
Arlington, TX
Ankita Sinha, MEng

Environmental Engineer
Jacobs
Arlington, TX
OA

Opeyemi Adelegan
HA

Hussain Ali
PR

Pablo Rosales
Bria N. Wooten, Bachelors of Science (Expected December 2020)

Undergraduate Research Assistant
University of Texas at Arlington
Arlington , Virginia
ST

Sorakrich Techapaphawit, Bachelors

King Mongkut's University of Technology Thonburi
Bangkok, Krung Thep, Thailand

Manhole shafts in sewers are prone to deterioration due to Microbially Induced Concrete Corrosion (MICC), which can reduce their life from 100 years to 30-50 years, and in extreme cases to 10 years. MICC is facilitated by sulfuric acid formed by the generation and volatilization of hydrogen sulfide (H2S). Corrosion of manholes on roads can create safety hazards from manhole lids falling through the structure, streets giving way, or sewers flowing beyond their capacity.
Accordingly, this project sponsored by the City of Arlington aimed to identify factors that contribute to H2S corrosion of manholes, so that these factors can be mitigated, or so that manholes most vulnerable to corrosion can be lined with protective coatings. The initial phase of the project involved collection of data from 366 manholes, including liquid- and gas-phase parameters that influence corrosion, as well as corrosion depth. The second phase of the project involved modeling H2S generation and rates of MICC in manholes.
Our results showed that manhole design and conditions in the manhole determined H2S generation. Manholes with hydraulic jump designs had the highest H2S concentrations, and lowest was observed in manholes with subcritical flow, indicating that turbulent flow increases rates of corrosion. Based on the field data, a multiple linear regression equation will be developed to predict hydrogen sulfide generation and corrosion rates in manholes.