ZHANGZhi-qiang,SUNYi-fan,LIUYu-xin,et al.Impact of Environmental Factors on Physicochemical Properties of Fat, Oil and Grease Deposits in Sewage Pipes[J].China Water & Wastewater,2025,41(15):24-30.
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Impact of Environmental Factors on Physicochemical Properties of Fat, Oil and Grease Deposits in Sewage Pipes

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第15期 Page: 24-30 Column: Date of publication: 2025-08-01
Author(s):
ZHANG　Zhi-qiang1; 2;  SUN　Yi-fan1;  LIU　Yu-xin1;  ZHANG　Zi-geng1;  LI　Jin1;  LU　Jin-suo1
（1. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. State Key Laboratory of Urban Water Resource and Environment， Harbin Institute of Technology， Harbin 150090， China）
Keywords:
sewage pipe;  fat;  oil and grease deposits;  physicochemical property;  environmental factor;  siltation management
Abstract:
The issue of siltation and blockage in sewage pipe network due to the formation and accumulation of fat, oil, and grease deposits is significant, severely impacting the efficiency of sewage collection and transportation within the network. This study selected the main factors including pH, temperature, and calcium ion concentration affecting fat, oil, and grease deposits formation as influencing variables, and analyzed the physicochemical properties of the deposits, including particle size distribution, moisture content, saponification rate, surface group composition, as well as hydrophilicity and hydrophobicity, aiming to investigate the impact of environmental factors on the physicochemical characteristics of the deposits. Additionally, the thermodynamic aggregation tendency among deposit particles was evaluated using the XDLVO theory. The average particle size of the deposit particles was significantly influenced by the environmental factors. An increase in pH, temperature, and calcium ion concentration enhanced the formation rate of calcium?based fatty acid salts and accelerated the saponification process of the deposits. The interfacial adhesion free energy of the deposits decreased to -44.56 mJ/m2 under alkaline, low temperature, and low calcium ion concentration conditions, thereby facilitating the aggregation and adhesion of the deposits. In the management of sewage pipe siltation, it is crucial to enhance the monitoring of sewage pH and calcium ion concentration. Particular attention should be given to the issue of fat, oil, and grease deposition leading to siltation and blockage during low temperature periods.
Last Update: 2025-08-01