A note on the control of sulphate‐reducing bacteria in seawater by u.v. irradiation

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Abstract
Continuous and batch cultures of marine sulphate‐reducing bacteria (SRB) in North Sea water were irradiated with 110000 to 329500 μWs/cm2 of ultraviolet radiation (wavelength 253.7 nm) with a commercial u.v. sterilizing unit. A 100% kill was obtained with logarithmic cultures of Desulfovibrio desulfuricans NCIMB 8400 at population densities of 10–104/ml. A >99.99% kill was obtained with a mixture (ca 105/ml) of batch grown Desulfovibrio spp. and oilfield SRB enrichments. Ultraviolet irradiation was less effective against the indigenous heterotrophic bacteria in the seawater (ca 90% kill).