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Odor control in small doses

By Paul Grad |

A team headed by professor Zhiguo Yuan, from the Advanced Water Management Center, University of Queensland (Brisbane, Australia; www.awmc.uq.edu.au) claims to have developed a new method for corrosion and odor control in sewers that is more cost-effective and environmentally friendly than other chemicals commonly used by the water industry. Corrosion and odor problems are caused by hydrogen sulfide (H2S) produced by bacteria, which reduce sulfate to sulfide in anaerobic sewers.     The team’s method, involving a mix of chemicals called Cloevis, consists of intermittent dosing — 8–24 h/wk dosing or longer, depending on biofilm thickness, previous dosing history, weather and other factors — of mainly nitrite and hydrochloric acid simultaneously, to suppress both sulfide and methane production. Previous strategies require continuous chemical addition, with inevitably high chemical consumption and operational costs, on top of their large environmental footprint.       Earlier research by the team had shown nitrite to be effective in inhibiting sulfide and methane production in sewers. Recently, the team has shown that it is the biocidal effect of free nitrous acid (HNO2 — formed from…
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