Meeting the Challenge
Protecting Critcial Wastewater Infrastructure
Microbial induced corrosion and water infiltration are the two major problems common to sewage collection and wastewater treatment structures. Unattended or poorly treated, these problems result in the rapid deterioration of concrete structures with the consequence of costly rehabilitation and significantly reduced service life. It’s a situation and challenge well known to engineers and municipalities the world over as they address the ever-increasing demand for structures that will meet the growing demands of industry, the environment, economics, and the need for improved water supply and sanitation.
Xypex has over 50 years experience in the waterproofing and protection of the concrete infrastructure of cities and is up to the challenge. Our Xypex Crystalline Technology has been proven in rehabilitated as well as new sewage and wastewater treatment structures and is considered the best at handling chemical attack in severe biochemical conditions and resisting water infiltration even under extreme hydrostatic pressure.
The Structures – The Problems
Xypex products play a major role in the prevention and treatment of problems common to both segments in Wastewater Infrastructure: the Sanitary Sewer Collection System and the Wastewater Treatment Plant. Microbial induced corrosion and water infiltration are major problems to both segments that Xypex can improve.
Microbial Induced Corrosion
Slow flow and long retention times in a sanitary sewer are the precursor to microbial induced corrosion in sewer and wastewater treatment structures.
During transit time, dissolved hydrogen sulfide (H2S) is produced in the waste flow liquid by sulfate-reducing bacteria under anaerobic conditions. Hydrogen sulfide gas is released into the sewer atmosphere by turbulence and dissolves in the moisture and slime on the sewer crown. Bacteria turn the sulfur compounds into sulfuric acid which attacks the concrete by means of acidic corrosion and longer term through expansive sulfate attack. This causes the concrete to slowly corrode and self-destruct.
Infiltration & Exfiltration
A common source of water infiltration into manholes and sewer line is cracks or displaced joint lines caused by frost heaving, ground traffic or settlement. Water infiltration can increase total flow by as much as 25% – 30% which significantly raises chemical treatment costs while at the same time potentially creating capacity problems for wastewater plants.
Bio-San C500
Xypex Bio-San is a uniquely designed admixture for integral, long-term protection of concrete in harsh sewage conditions with levels of H2S that cause microbial induced corrosion (MIC). Bio-San combines potent antimicrobial protection along with the unique crystalline technology of the Xypex Admix C-Series.
Bio-San contains bio-active mineral solids that become permanently fixed within the cement matrix impairing bio-film formation thus inhibiting the growth of acid causing sewer bacteria such as Thiobacillus due to concentrations of H2S. The unique Xypex Crystalline Technology creates a permanent structure throughout the pores and capillary tracts providing waterproofing and enhanced chemical protection including acid and sulphate resistance. Bio-San prevents microbial induced corrosion, stops infiltration/exfiltration of water, and provides acid and sulphate resistance, significantly extending the service life of concrete sewage collection systems and waste water infrastructure.
Xypex Admixtures now contain the latest in Xypex innovation, the Visual Detection System (VDS). It is designed to confirm the presence of Xypex Crystalline Waterproofing Admixture in hardened concrete. To learn more about VDS, click here: VDS.
Advantages
- Inhibits microbial induced corrosion
- Resists extreme hydrostatic pressure
- Resistant to aggressive chemicals (acids and sulphates)
- Can seal static hairline cracks up to 0.5 mm
- Becomes a permanent, integral part of the substrate and cannot be punctured, damaged or lose adhesion
- Does not contain any VOCs
- Less costly to apply than most other methods
- Added to the concrete at the time of batching and therefore not subject to weather and surface moisture constraints
- Contains Visual Detection System
Recommended for:
- Manholes / Sewer Pipes
- Pump and Lift Stations
- Head Works
- Septic Tanks
- Digesters
- Clarifiers
- Industrial Structures
Ideal for pre-cast and cast-in place concrete:
- Added to the concrete at the time of batching
- No need for liners or coatings
- Saves time in production process as a one component solution
- Extends the service life of concrete in wastewater structures
KILLS the microbes that cause concrete corrosion in sewage environments
PROTECTS concrete in high concentrations of hydrogen sulphide
PREVENTS the infiltration and exfiltration of liquids even under extreme hydrostatic pressure
SELF-HEALS static cracks up to 0.5mm
PROTECTS concrete in acidic environments
PROTECTS concrete in sulphate environments
Xypex Megamix II with Bio-San
Xypex Megamix II with Bio-San is a resurfacing mortar specifically designed for the restoration of deteriorated concrete surfaces caused by microbial induced corrosion, abrasion/erosion and chemical attack. It is formulated for ease of application, superior bond, low shrinkage, high strength and resistance to microbial, acid and sulphate attack. Xypex Megamix II with Bio-San is a one component mortar and can be spray or trowel applied at a thickness of 10 – 50 mm per layer. The high performance characteristics of Megamix II with Bio-San are enhanced by Xypex’s unique crystalline waterproofing and protection technology. In most applications, such as manhole resurfacing, Megamix II with Bio-San can be used to replace epoxy linings and calcium aluminate repair mortars.
Advantages
- Excellent adhesion and bond to concrete substrates
- Inhibits microbial induced corrosion
- Low shrinkage, fiber reinforced
- Resistant to acid attack
- Very resistant to severe sulphate exposure
- Highly resistant to chloride diffusion
- Ready to use – just add water
- Vertical and overhead concrete repair; sprayable
- Non-toxic / no VOCs
- CE certified meeting EN 1504-3
Recommended for:
- Manholes / Sewer Pipes
- Pump and Lift Stations
- Head Works
- Septic Tanks
- Digesters
- Clarifiers
- Industrial Structures