Technology in Sewage Treatment
Modern technology in sewage treatment is aimed at developing more efficient, less contaminating processes. Activated sludge using high purity oxygen in the waste water to speed up the treatment process, is of the recent advances. Selection of materials for construction of the plants has held up the use of the process because of the extreme corrosive conditions. In order to assist in commercializing the oxygenating process, EPA commissioned the Bureau of Reclamation to run test on a number of materials, including protective coatings. Among the coatings tested were vinyl resins, coal tar enamel and coal tar epoxy, butyl rubber, a phenolic, and anodizing process, a phenolic epoxy and several urethanes. ZEBRON 100% solids polyurethane coating came out tops in all tests.
ZEBRON COATINGS FOR SANITATION AND SEWAGE TREATMENT
Zebron coatings have been specified and installed in sanitation and sewage treatment applications throughout the US since their first use in the late 1970’s. Most of these structures are corroded by sulfuric acid and industrial waste. Zebron is completely impervious to deterioration from hydrogen sulfide, sulfuric acid and many others found in sewage and wastes.
Test Result Zebron Coatings
Tests completed by Northwest Testing Laboratories and Zebron Laboratory show that Zebron coatings resist a wide range of inorganic and organic acids, bases, salts, bleach, gasoline, diesel, and special chemicals. The following passed
Sulfuric to 50% at room temperature, Sulfuric to 20% at 150 degrees F, Sulfurous to 6% at room temperature, Hydrochloric to 37% at room temperature, Nitric to 5% at 150 degrees F, Nitric to 5% at 150 degrees F, Acetic to 20% at room temperature, Acetic to 10% at 150 degrees F, Hydrofluoric to 10% at room temperature, Chromic to 15% at 150 degrees F, Formic to 88% at room temperature.
Sodium Chloride to 20% at 150 degrees F, Sodium Chlorate to 46% at 150 degrees F, Sodium Carbonate, Saturated at room temperature, Sodium Sulfate, Saturated at room temperature.
Black Liquor, Paper Mill at Room Temperature, Ethylene Glycol at room temperature.
In a series of tests made by the Bureau of Reclamation for EPA, ZEBRON polyurethane coating showed no defects when immersed in oxygenated wastewater for periods up to 28 months. ZEBRON coated samples, steel and concrete, were placed in three zones, liquid gas and interface in three separate wastewater treatment plants, along with samples of 13 other coatings. ZEBRON was one of only two coatings to show no defects throughout the testing.
Report NO. EPA-IAG-0187 (D), issued by the Municipal Environmental Research Laboratory of the EPA, is available from the ZEBRON Corporation.
For additional information call 1-800-824-4214