Injection Grouting Stops Inflow and Infiltration Adapted from Information by Aries Industries, Inc. Injection grouting to stop groundwater inflow and infiltration is a cost-effective solution many municipalities utilize. Groundwater inflow and infiltration into sewer pipelines refers to the unintentional entry of groundwater into a sewer system. While sewers are designed to carry wastewater from various sources, they are not intended to handle large volumes of groundwater. Groundwater inflow occurs when water from the surrounding soil and subsurface enters a sewer system through direct connections, such as leaky manhole covers, damaged pipes, or improperly sealed joints. Inflow typically happens during heavy rainfall or when the water table is high. It is a relatively rapid and noticeable entry of water into the sewer system. Groundwater infiltration refers to the slow seepage of groundwater into sewer pipelines through cracks, defects, or porous materials. Over time, groundwater can penetrate sewer pipes through deteriorated or damaged sections. Infiltration is a more persistent issue and can occur even when there is no rainfall, or during dry periods. Both groundwater inflow and infiltration pose challenges for sewer systems such as: Increased Flow - Extra water adds to the overall flow within the sewer system, which can exceed its capacity, causing an overload leading to backups, surcharges, or overflows. It reduces the system’s hydraulic efficiency and can cause damage to infrastructure. Treatment Costs - Groundwater entering a sewer system increases the volume of water needing to be treated at wastewater plants. Treating this excess water adds to the operational costs of the facility. Environmental Impact - Excessive groundwater entering a sewer system can overwhelm the treatment capacity, leading to the discharge of partially treated or untreated wastewater into receiving bodies of water, causing pollution. Injection grouting is a soil sealing process with a two-component chemical grout injected under low pressure through joints and pipe defects. The grout travels into soils and voids around mainline pipe, laterals, lateral connections, and manhole structures to stop leaks, stabilize soils, and control infiltration. The sealing is achieved by filling voids between the soil grains on the exterior of structures creating a waterproof barrier. Grout mixes, additives, and grouting techniques provide long-lasting repairs. As an approach at all four points of entry - mainlines, laterals, service connections, and manholes - injection grouting will extend the service life of sewer pipelines, reduce flow to treatment plants, maintain system capacity, decrease the frequency of cleaning, and minimize the cost of water treatment. A grouting system truck is the hub and control center for injection grouting. Vehicles are custom-built or retrofitted to include equipment necessary for injection grouting: - High-power winches to move the packer between joints quickly - 800 feet of grout house for multiple run set-ups from a single entry point - High-volume, electric CAT® triplex pumps for precise grout delivery - 60-gallon grout tanks with continuous-duty mixers for fast chemical mixing - Simple, push-button operation - Easy-to-read gauges for information on flows and pressures - Complete TV inspection system to monitor the grout ing process Injection grouts do not stop sewer leaks simply by filling joints and cracks. Instead, grout is forced under pressure through joints and cracks and into the surrounding soil where it gels with the soil to form a waterproof mass which cannot be pushed back into the sewer system. Once injected into soil, the grout cures to create an effective, long-lasting water barrier. WTR Empire State Water Well Drillers Association 2024 Annual Meeting January 16 17, 2024 Turning Stone Casino Verona, NY Auction Seminars Cocktail Party Membership Meeting Exhibits and More! nywelldriller.org Got a friend who always takes your copy of WorldWide home? Get him/her their own! 55 DECEMBER 2023 WorldWide Drilling Resource®
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