The accumulation of fat, oil, and grease (FOG) deposits in sewer pipes reduces their conveyance and results in Sanitary Sewer Overflows (SSOs). Previous research has shown that concrete used in sewer lines is a significant source for calcium ion, which participates in the FOG deposit formation mechanism. However, no research has been conducted to understand the effect of calcium leaching from cement on FOG deposits formation and adhesion. This study quantifies the reduction in FOG deposit formation when Fly Ash (FA), a Supplementary Cementitious Material (SCM), is used to replace cement in the production of High Volume Fly Ash (HVFA) concrete materials. Results show that after 90 days of leaching test under controlled pH conditions, 75% and 86% reduction in calcium release were achieved from 50% and 75% FA replacement, respectively. After 30 days of FOG deposits formation tests on HVFA samples, 58% and 81% reduction in FOG deposit formation was found for 50% and 75% FA replacement, respectively. FTIR analyses of FOG deposits formed on concrete samples without FA replacement exhibited high calcium soap content (48%), while, FOG deposit formed on HVFA concrete materials showed low calcium soap percentage (22~29%). Furthermore, FTIR analyses report the first spatial variation found in FOG deposits that includes a surface layer of hard FOG deposits with high calcium soap absorbance and an outer layer of soft FOG deposits consisting of a low calcium absorbance. FTIR analyses revealed that the FOG deposit formation mechanism is affected by the availability of calcium and pH near the concrete surface. Finally, HVFA concrete materials were tested for compressive strength and durability against microbially induced concrete corrosion (MICC). After 180 days of sealed curing, HVFA concrete exhibited adequate compressive strength necessary for the sewer line construction and 50% FA replacement revealed satisfactory durability against MICC.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.watres.2020.116304 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comprehensive Analysis of Factors Leveraging Bio-Inspired Conical Designs for Efficient Fog Harvesting.
Langmuir
March 2025
Multiscale Multiphysics Thermo-Fluids Lab, Department of Mechanical Engineering, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani333031, Rajasthan, India.
Environmental fog accumulation is a sustainable source of clean water, particularly in humid and arid regions. Many organisms have evolved passive microstructures to aid in fog droplet nucleation, accumulation, and transport. Researchers have developed various fog collectors, utilizing strategies like wire mesh, conical geometries, micronano texturing, and wettability modifications to enhance water collection.
View Article and Find Full Text PDFInfluence of improper disposal on FOG deposition: Rheological behaviour and pumping power requirements in sewer systems.
Water Res
February 2025
School of Engineering, RMIT University, Melbourne VIC 3001, Australia. Electronic address:
Residents often perceive kitchen sinks and toilets as convenient disposal points for substances like leftover food particles, used cooking oil (UCO), tissues, wet wipes, and other sanitary products. However, this practice significantly contributes to the formation of fatbergs, leading to blockages in sewer lines. Previous studies have mainly utilised aqueous solutions containing specific inorganic constituents, leaving the mechanisms of fat, oil, and grease (FOG) deposit formation in complex wastewater containing both organic and inorganic matter largely unexplored.
View Article and Find Full Text PDFIdentifying surface formation and adhesion mechanisms of FOG deposits on sewer lines.
Water Res
February 2025
Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, NC 27606, USA.
Fat, oil, and grease (FOG) deposits contribute to 25 % of Sanitary Sewer Overflows (SSOs) in the U.S. and is exacerbated by the aging sewer infrastructure.
View Article and Find Full Text PDFMassive Carbon Black Inhalation.
J Community Hosp Intern Med Perspect
January 2025
Departments of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA.
Carbon black is the general term for a powdery commercial form of carbon. It can cause adverse health effects after inhalation, ingestion, or dermal contact. Exposure to carbon black particles can have adverse effects on the respiratory system; this exposure usually occurs when people inhale contaminated air in the workplace.
View Article and Find Full Text PDFRose-Inspired Adhesive Surface Regulation for Enhanced Fog Water Collection Efficiency and Self-Cleaning.
ACS Appl Mater Interfaces
January 2025
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
Inspired by the adhesion differences on the surfaces of fresh and dried rose petals, a rose bionic self-cleaning fog collector (RBSC) was designed and prepared to realize a self-driven fog harvesting function. The droplet detachment iteration rate was revealed by the regulating mechanism of the surface adhesion force of the RBSC and the influence of bionic texture parameters, as demonstrated through the fog harvesting experiment and droplet detachment failure analysis. Through the surface adhesion force regulation, the probability of droplet dissipation with the airflow is reduced by increasing the falling droplets' mass, and the single surface fog capture efficiency is up to 740 mg cm h.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!