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Wastewater treatment plants expose concrete to an unusually aggressive combination of chemical, mechanical, and environmental stresses. Service-life threats vary by process area, but they often interact and accelerate deterioration.
In influent channels, grit chambers, screens, and pump stations, high-velocity flows carrying sand, gravel, and debris cause abrasion and erosion. This wears away the cement-rich surface, exposes aggregate, and can leave reinforcing steel more vulnerable to corrosion. Cavitation near pumps and hydraulic structures can intensify surface loss.
Primary and secondary clarifiers, aeration basins, equalization tanks, digesters, and sludge-storage tanks face long-term chemical exposure. Sulfides in wastewater can be converted by bacteria—particularly above the waterline in humid, oxygen-rich headspaces—into sulfuric acid. This is a major cause of microbiologically induced concrete corrosion: the acid attacks cement paste, reducing strength and causing softening, scaling, and section loss. Anaerobic digesters may also expose concrete to gases, condensate, and elevated temperatures.
Containment tanks are especially sensitive because joints, penetrations, pipe connections, and construction interfaces can leak. Leakage can carry aggressive wastewater into cracks and behind linings, while external groundwater pressure may force water inward. Failed waterstops, sealants, coatings, or membranes commonly create localized deterioration.
Cracking arises from drying shrinkage, thermal movement, restrained volume change, settlement, seismic loading, freeze–thaw exposure, and structural overload. Even narrow cracks allow chlorides, sulfates, carbon dioxide, and moisture to reach reinforcing steel. Once steel corrodes, its expansion causes delamination and spalling, further opening pathways for leakage.
Concrete may also suffer sulfate attack, alkali-related reactions where susceptible materials are present, freeze–thaw damage in exposed structures, and damage from poor drainage or inadequate curing. Durable design therefore depends on low-permeability concrete, crack control, chemical-resistant linings or coatings, robust joint detailing, adequate cover over reinforcement, and regular inspection and maintenance.
Wastewater environments can be highly corrosive to concrete. There are elevated levels of hydrogen sulfides, acidic water, sulfates, salts and other harsh chemicals. Kryton has developed an admixture specifically designed for wastewater treatment facilities, called KIM BioGard. It protects against water penetration, H2S, acidic waters, sulfate attack, salts/chlorides, and ASR.
KIM® BioGard, Kryton’s integral waterproofing admixture, provides additional protection by:
Abrasion and erosion are also major concerns. In spillways, channels, tanks, and pumping stations, fast-moving water, grit, sand, suspended solids, and turbulent flows can wear away concrete surfaces. Over time, this surface loss exposes aggregate, increases roughness, reduces hydraulic efficiency, and creates pathways for further deterioration.
Hard-Cem®, Kryton’s integral abrasion resisting admixture:
For publicly funded assets, longer service life means fewer shutdowns, fewer emergency repairs, lower lifecycle costs, and better value for taxpayers. These admixtures support sustainability by reducing the need for replacement concrete, repair materials, transportation, demolition, and reconstruction, all of which contribute to embodied carbon.
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