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International Research Journal of Engineering and Technology (IRJET)

e-ISSN: 2395-0056

Volume: 10 Issue: 03 | Mar 2024

p-ISSN: 2395-0072

www.irjet.net

Ice Pigging in Drinking Water Distribution Network: A Chemical-Free Approach for Water System Maintenance Aiswarya M1, Chithra K G2 1Student, Department of Civil Engineering, JCET, Kerala, India

2Assistant Professor, Department of Civil Engineering,JCET ,Kerala, India

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Abstract - Ice Pigging is an innovative pipeline cleaning

compromise water quality. Drinking water distribution can be affected by the release of pipe materials, biofilm detachment, and the resuspension of loose deposits. Additionally, sediments and microorganisms in DWDSs are responsible for discoloration, metal ion release, and bacterial level increases. Water company’s clean pipelines to remove sediments and microorganisms in DWDSs for a continuous, safe, and reliable water supply.

method that utilizes a slurry of ice and water to effectively remove accumulated deposits from pipes. This semi-solid slurry, known as the “ice pig,” is formed by a dense suspension of small ice crystals that behaves like a plug, efficiently scrubbing the interior walls as it moves through the pipeline under pressure. Originally developed for applications like sewer and wastewater systems, Ice Pigging has recently gained traction in drinking water distribution systems due to its ability to remove sediment, biofilm, and other residues without using harsh chemicals or requiring extensive downtime. Despite its benefits, Ice Pigging has raised concerns regarding its impact on bulk water quality, sparking debate within the industry. Critics argue that as the ice melts and mingles with residual sediments or organic materials, there may be an increased risk of contaminant release into the water supply. Conversely, proponents claim that the process, if conducted properly, minimizes contamination risk and can even improve water quality by removing potential contamination sources. While studies have shown that Ice Pigging is effective in removing deposits, more research is needed to fully understand its potential effects on water quality, especially in drinking water systems, where purity is paramount.

2. ICE PIGGING Ice Pigging is a pipe-cleaning process that uses a slurry of ice crystals and water to remove sediments, biofilms, and other residues from the interior of pipelines. Known as the "ice pig," this semi-solid, flowable plug moves through pipes under pressure, scrubbing their surfaces more effectively than traditional methods. Initially developed for wastewater and sewer systems, Ice Pigging is now used in drinking water distribution systems due to its ability to clean without chemicals or heavy equipment. While effective, concerns remain about its potential impact on water quality, as melting ice may release residual contaminants into the water system.

2.1 Science Behind Ice Pigging

Key Words: Ice Pigging, Ice Slurry, Bulk Water Quality, Drinking Water Distribution System, Bulk Water Quality

Ice pigging operates on the principle of using a highly viscous ice slurry to scour and clean the interior surfaces of pipes. The ice slurry is created by mixing finely ground ice with water to form a dense, flowable mixture. The slurry is then introduced into the pipeline, where it moves under hydraulic pressure.

1.INTRODUCTION Public health is strongly linked to the safety of drinking water. The quality of drinking water often declines when distributed through water distribution systems. The concept of using ice for pipeline cleaning emerged as an innovative response to the limitations of conventional cleaning methods like mechanical pigging, air scouring, and chemical flushing. Traditional methods frequently need large amounts of water, are abrasive, or use chemicals that might pose risks to the environment and health. In contrast, ice pigging offers a gentle yet effective cleaning approach that leverages the unique properties of ice – primarilyits semi-solid state and its ability to conform to different pipe geometries.

3.PREPARATION OF ICE SLURRY The preparation of an ice slurry is a critical step in Ice Pigging, as the composition and consistency of the ice determine the effectiveness of the cleaning process. The delicate balance requires technical expertise and specialized equipment to produce an effective, stable slurry that can perform in diverse pipeline environments.

3.1 Producing Ice The first step in preparing ice slurry is to produce the ice, which forms the basis of the slurry. Commercial-grade ice makers are typically used to produce the necessary ice, as

Ensuring the safety and quality of drinking water is a crucial priority for water utilities. However, challenges within drinking water distribution system (DWDSs) can

Impact Factor value: 8.315

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