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Investigating Characteristics and Corrosion Treatment of Industrial Cooling Water by the Passivation Process using Lawsonia Inermis

Author Affiliations

  • 1Faculty of Civil Eng. and Earth Resources, University Malaysia Pahang, Lebuhraya Tun Razak, 26300, Kuantan, Pahang, MALAYSIA
  • 2 Institute of Env. and Water Res. Manag. (IPASA), Universiti Tech. Malaysia, 81310, Johor, MALAYSIA
  • 3 UTM Razak School of Eng, and Adv. Tech., University Tech. Malaysia (Int. Campus), Jalan Semarak, 54100, Kuala Lumpur, MALAYSIA

Res.J.chem.sci., Volume 1, Issue (9), Pages 73-78, December,18 (2011)


A cooling water system plays a major role in the manufacturing activities and in controlling the internal environment of an industry. The cooling water must carry protective inhibitors to surfaces that require protection. In the present study, the performance and efficiency of the passivation process in a cooling water system using Lawsonia Inermis (Henna) was investigated. The wastewater samples were taken from two industries; Flexsys Chemicals (M) Pvt. Ltd and Cargill Palm Products Pvt. Ltd, Malaysia and their quality were analyzed in terms of total dissolved solids (TDS), chemical oxygen demand (COD), total organic carbon (TOC), turbidity, nitrite, iron, lead and pH. Results showed all the parameters measured contributed to the corrosion in the open circulating cooling systems. However, the water quality results complied with the parameter limits stated in the Standard B of the Environmental Quality Act (1974). In addition, the results showed there is a potential for Lawsonia Inermis to be applied as an efficient inhibitor for corrosion. The inhibition efficiency increased (17.19%) when Lawsonia Inermis concentration was increased gradually from 20 to 200 mL. Besides, the surface analysis on corroded nails showed color change from yellowish-brown to grey which was the original color of the nails.


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