STUDY ON SEDIMENTATION CHARACTERISTICS OF MICROORGANISMS IN LAYERED SAND DURING RECHARGE OF WATER SOURCE HEAT PUMP

Zhao Jun; Zhang Hanwen; Peng Peng

doi:10.19912/j.0254-0096.tynxb.2025-0519

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 39-45. DOI: 10.19912/j.0254-0096.tynxb.2025-0519

STUDY ON SEDIMENTATION CHARACTERISTICS OF MICROORGANISMS IN LAYERED SAND DURING RECHARGE OF WATER SOURCE HEAT PUMP

Zhao Jun^1,2, Zhang Hanwen^1,2, Peng Peng³

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Abstract

To address the clogging issue caused by microbial activity in stratified soils during water source heat pump reinjection, this study utilized sand with varying particle sizes as porous media, employing Escherichia coli （E. coli） as a tracer to investigate microbial migration-deposition characteristics. One-dimensional sand column experiments were conducted to analyze breakthrough curves and migration-deposition patterns of microorganisms in stratified soils. The indoor test results demonstrate：1） In heterogeneous porous media, E. coli primarily deposits in surface layers, with its concentration decreasing progressively with increasing migration distance. Lower media permeability （or smaller particle sizes） causes deposition zones to shift closer to the surface. 2） Stratified configurations have a significant impact on bacterial migration. A sequence of overlying coarse-grained layers and underlying fine-grained layers causes the peak time of the bacteria in the effluent to shift forward. 3） Simulation of the microbial clogging mechanism reveals that experimental data on temporal variation of permeability coefficient decay exhibit good consistency with theoretical predictions. This research provides theoretical foundations for enhancing reinjection efficiency in water source heat pump systems.

Key words

microbial blockage / water-source heat pump / deposition-detachment / Escherichia coli / stratified soil / sand

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Zhao Jun, Zhang Hanwen, Peng Peng. STUDY ON SEDIMENTATION CHARACTERISTICS OF MICROORGANISMS IN LAYERED SAND DURING RECHARGE OF WATER SOURCE HEAT PUMP[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 39-45 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0519

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