Abstract
Hospital liquid infectious waste is one of the most important aspects of water contamination. The present investigation was undertaken to evolve a cost effective alternate method of waste water treatment by using Oxidized Water as a disinfectant for hospital effluents. Liquid infectious waste coming from diagnostic laboratories of hospitals (Urine, Blood and Mix of both) was treated with electrolyzed Oxidized Water. Different v/v ratios (95:5, 85:15, 75:25, 50:50 and 25:75) of Sample to Electrolyzed Oxidized Water (EOW) were cultured and incubated at 37 o C for 24 hours. EOW showed a direct relationship with the decontamination of inorganic urine but for blood, an unidentified pattern was observed that may be due to change in pH and/or Oxidation Reduction Potential (ORP) of EOW because of organic nature of blood. The most effective ratio of sample to EOW, at which decontamination was found to be maximum for urine, was 25:75 with treatment efficiency of 96.15 % and 85:15 with treatment efficiency of 84.8 % for blood. The study revealed that Electrolyzed Oxidized Water may be used as a better alternative for treatment of liquid infectious waste.
Highlights
S hypochlorous acid (HOCl) and hypochlorite (Sharma and Demirci, 2003)
Electrolyzed Oxidized Water (EOW) showed a direct relationship with the decontamination of inorganic urine but for blood, an unidentified pattern was observed that may be due to change in pH and/or Oxidation Reduction Potential (ORP) of EOW because of organic nature of blood
Blood treatment with EOW showed an unidentified pattern of decontamination i.e., reduction in number of colonies was observed at sample to EOW ratios, 95:5 and 85:15 is shown in graph 1
Summary
S hypochlorous acid (HOCl) and hypochlorite (Sharma and Demirci, 2003). The alkaline solution from the cathode has a high pH and low ORP (Kumon, 1997). Large amount of HOCl at a low pH of ~3 enhances the disinfecting efficacy of EOW (Vorobjeva et al, 2004; White, 1999). EOW is found to be a useful disinfectant for hospital infections. They investigated EOW against 10 of the most common opportunistic pathogens which became completely inactive after treatment (Vorobjeva et al, 2004). The present investigation was undertaken to select the best concentration of EOW to decontaminate the infectious effluents from microbiological laboratory of hospital. Comparison of number of microbial colonies grown in the sample control and treated samples was taken as criteria to determine the best ratio of EOW to treat for maximum decontamination
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