Abstract
It was recognized that the corrosive behavior of the waste water from leather industry is characterized in:
(1) The pH value of effluent from the waste water pretreatment facility at its outlet varies from 4.4 to 13.3.
(2) The effluent is rich in sulfide and sulfate ions, the former generates H2S due to the change of pH from basic to acidic merely, and the latter is converted to H2S by the action of sulfate-reductive bacteria.
Corrosion proofness of a FRP lining to be applied to the interior surface of concrete sewer pipeline which is scheduled to flush the above-mentioned waste waster, was evaluated by various testing methods. Visual observation, dye penetration test, microscopic observation of surface and cross section, weight change, Taber abrasion test, Barcol hardness, thickness check and measurement of adhesion strength were all valuable for the purpose. However, the last one of these methods still leaves a room for further study in terms of the accuracy and the correspondence between actual lining and test result.
