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Overview of antimicrobial agent for sewarage concrete “Zeomighty”

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Antimicrobial agent for sewerage concrete “Zeomighty”

While the percentage of the areas where sewer service is available is increasing,sulfuric acid corrosion of concrete effluent pipes is noted as a problem of the existing sewer systems. Hydrogen sulfide generated from sewage is transformed into sulfuric acid through the action of sulfur oxidizing bacteria (Thiobacillus spp) and sulfuric acid corrodes concrete effluent pipes.

As a precaution against this problem, the adoption of concrete containing our Zeomighty (antimicrobial concrete) is spreading. The effects of antimicrobial concrete is introduced in the "Handbook for preventing the corrosion of sewer concrete pipes (draft)" compiled by the Japan Sewage Works Association, which is a Public Interest Incorporated Association in Japan, and antimicrobial concrete is broadly supplied to various local authorities as a standard technology to control concrete corrosion.

Sinanen Zeomic has organized the Antimicrobial Concrete Study Group to perform the technical evaluation of antimicrobial concrete and study its application technology.

Obtaining support from 50 companies including secondary concrete product makers (as of July,2016),the Study Group is pushing its initiatives to win further confidence in antimicrobial concrete and exploit the market.

Zeomighty is an antimicrobial concrete additive developed by Sinanen Zeomic which inhibits the growth of sulfur oxidizing bacteria causing concrete corrosion. In fiscal year 1999, the "Certificate of Examination as Sewer Technology" from the Japan Institute of Wastewater Engineering Technology was obtained. (Renewed March 2010 and scheduled for next renewal in March 2015).

Photo of corrosion degradation

Photo of corrosion degradation

Antimicrobial concrete additive Zeomighty's five advantageous features

1. Simple production process for incomparable effect

To produce antimicrobial concrete products,all you have to do is add approx. 1% of Zeomighty in casting concrete or mortar. It is so simple and no special equipment or technology is required.

2. Realizing corrosion prevention and hygiene management with its excellent antimicrobial power

Zeomighty suppresses the propagation of sulfur oxidizing bacteria causing concrete and mortar corrosion and neutralizes them. It is also effective against various bacteria harmful to human health,thus contributing to hygiene management as well.

3. Safe,long-lasting and truly economical

Metal elements contained in Zeomighty are not soluble to or hardly eluted with water or organic solvents,therefore can meet regulations imposed on wastewater discharged to the environment. Since it has a long-lasting antimicrobial effect,it provides a truly economical means of corrosion prevention in comparison with conventional measures.

4. Even distribution due to its excellent dispersibility

Since it has specific gravity similar to those of cement and aggregates as well as particle size distribution matched to those of cement and admixtures,an ordinary plant can easily mix it into mortar or concrete. It will ensure good dispersion.

5. Intrinsic strength of concrete is maintained

No significant difference is observed between the compression strength of mortar or concrete with and without Zeomighty,and you can use products containing Zeomighty confidently as you use ordinary concrete products.

Structure of antimicrobial agent for sewarage concrete “Zeomighty”

Silver and copper ions are the most effective against Thiobacillus spp,the bacteria which causes corrosion. However,silver and copper ions cannot be used in isolation as they react with many chemical substances.

This is why Sinanen Zeomic has proposed a method to hold silver and copper ions in “Zeolite ( inorganic material)”.

Zeolite is made of silica and alumina. When Si in stable (SiO2)n is substituted by trivalent Al, negative charge is generated and a positive ion (silver or copper) will couple to it to compensate the negative charge. Zeomighty is an antimicrobial concrete additive containing zeolite-supported silver and copper, which has a chemically and physically stable structure.

Examples of actual applications of antimicrobial concrete additive Zeomighty

  • Secondary concrete products such as Hume pipes,manholes,and box culverts.
  • Cast-in place concrete structures for sewer and treatment facilities.
  • Other premix mortar,etc.

Pipe for a trenchless construction method (photo: Nihon Kogyo Co. Ltd.)

(photo: Teihyu Co., Ltd.)

Mini-shield segment (photo: Kubota Construction)

Before construction execution

After construction execution: inside view

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