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Water SA

versão On-line ISSN 1816-7950
versão impressa ISSN 0378-4738


RUNGVAVMANEE, Rapeepat  e  PHALAKORNKULE, Chantaraporn. Reduction of Langelier index of cooling water by electrolytic treatment with stainless steel electrode. Water SA [online]. 2012, vol.38, n.5, pp.825-830. ISSN 1816-7950.

The efficiency of electrolytic treatment in reducing the Langelier saturation index (LSI) of the cooling water from a cooling tower of a textile industry was investigated. Sacrificial anodes were employed which prevent obnoxious chlorine generation. A series of batch experiments using stainless steel electrodes were conducted with 4 different current densities (5, 7, 10 and 15 A/m2) and 6 different electrolysis times (20, 30, 40, 50, 60 and 70 min). The use of 7 A/m2 for 50 min electrolysis time yielded a satisfactory efficiency in reducing the LSI index from 2.57 to zero, indicating that the treated water was of sufficient quality to be reused in the cooling process.

Palavras-chave : cooling water; electrolytic treatment; hardness; Langelier saturation index; water reuse.

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