Corrosion investigations on secondary treated paper mill effluents

Abstract

Purpose

This paper aims to report on corrosivity of secondary-stage paper mill effluent and corrosion performance of stainless steels.

Design/methodology/approach

For this purpose, immersion test and electrochemical polarization tests were conducted in mill and synthetic effluent to evaluate the uniform and localized corrosion.

Findings

Corrosivity of mill effluent has been compared with synthetic and primary-stage effluent of the same mill. It is observed that anions present in them, viz. SO₄−, PO₃4−, NO₂− and NO₃−, impart inhibition, whereas Cl− and chlorophenols enhance the corrosivity of the effluent. The overall effect of various components was reduction in corrosivity of secondary mill effluent.

Originality/value

These observations can be useful for material selection and helpful in corrosion mitigation in paper mill effluent treatment plants.

Citation

Ram, C., Sharma, C. and Singh, A.K. (2015), "Corrosion investigations on secondary treated paper mill effluents", Anti-Corrosion Methods and Materials, Vol. 62 No. 5, pp. 327-333. https://doi.org/10.1108/ACMM-01-2014-1347