Browsing by Author "Kamitani, Y."

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A review of microbiological safety of fruits and vegetables and the introduction of electrolyzed water as an alternative to sodium hypochlorite solution
(Academic Journals) Issa-Zacharia, A.; Kamitani, Y.; Muhimbula, H. S.; Ndabikunze, B. K.
Efficacy of anaerobic methane fermentation system on Shochu waste treatment
(J SASJ) Issa-Zacharia, A.; Morita, K.; Kamitani, Y.
Efficacy of anaerobic methane fermentation system on Shochu waste treatment
(J SASJ, 2009) Issa-Zacharia, A.; Morita, K.; Kamitani, Y.
This study aimed at evaluating the efficacy of anaerobic methane fermentation on Shochu wastewater treatment and collecting the performance data for this system. The performance data studied include Chemical oxygen demand (CODcr) removal efficiency, methane production rate (MPR) and biogas production rate (BPR). Shochu wastewater contained 43,000mg/l and 36,800mg/l as total CODcr and suspended solids, respectively. Approximately CODcr removal efficiency of 98% could be achieved after 120h of fermentation in a batch reactor. The optimal biogas production was attained at the shochu wastewater to seed ratio of 1:4 (v/v). Undiluted shochu wastewater sample gave the best results indicating that its dilution is unnecessary. Initial material pH value of 6.5 to 7.5 for the shochu wastewater-seed mixture was effective and the pH outside this range resulted in reduced biogas production. Methane (CH4) content in biogas was on average 65.5% regardless of the initial pH value, with exception of pH 5.5 where no CH4 gas was detected. The BPR of 0.95l/ld and MPR of 0.43l/ld were realized with undiluted shochu wastewater at 1:4 (v/v) shochu wastewater to seed ratio. A large fraction of organic matter was effectively degraded.
Influence of the resource water's quality on the bactericidal effect of strong acid electrolyzed water: Focusing on its carbonate ion content as the pH change inhibitor [2008]
(J. SAS) Kamitani, Y.; Zacharia, I.; Hiejima, A.; Morita, H.; Yagi, Y. K.
Stability of slightly acidic electrolyzed water on storage and its microbial inactivation effectiveness on the aerobic microflora present on intact spinach (Spinacia oleracea L.) leaves
(J. SAS) Issa-Zacharia, A.; Morita, K.; Kamitani, Y.
Stability of slightly acidic electrolyzed water on storage and its microbial inactivation effectiveness on the aerobic microflora present on intact spinach (Spinacia oleracea L.) leaves
(J. SAS) ISSA-ZACHARIA, A.; Morita, K.; Kamitani, Y.
Stability of slightly acidic electrolyzed water on storage and its microbial inactivation effectiveness on the aerobic microflora present on intact spinach (Spinacia oleracea L.) leaves
(J. SAS, 2009) ISSA-ZACHARIA, A.; Morita, K.; Kamitani, Y.
The stability of Slightly Acidic Electrolyzed Water (SAEW) on storage was evaluated. SAEW samples of known initial Oxidation Reduction Potential (ORP, mV), pH and available chlorine concentration (ACC, mg/L) were stored at 25℃ in different containers and changes of ORP, pH and ACC were monitored daily for a period of 10 days. ORP, pH and ACC were respectively maintained at 900-1000mV, 5-6.5 and 10-30mg/L. SAEW was further evaluated for its microbial inactivation effectiveness on the aerobic microflora present on spinach (Spinacia oleracea L.) expressed as aerobic plate count (APC) and was compared to Sodium hypochlorite (NaOCl) solution. The decontamination was done by dipping spinach samples with or without a pre-washing step into treatment solution for 5min. SAEW (pH 5.5, 25mg/L ACC) achieved a significantly higher microbial reduction than NaOCl solution (pH 9.9, 103mg/L ACC). While pre-washing of spinach in running tap water for 5min increased the microbial reduction by SAEW from 1.3 logo colony forming units (CFU)/g to more than 2 log10 CFU/g at 5min contact time, increasing exposure time did not significantly affect its antimicrobial effectiveness on spinach aerobic microflora.
Stability of slightly acidic electrolyzed water on storage and its microbial inactivation effectiveness on the aerobic microflora present on intact spinach (Spinacia oleracea L.) leaves
(J. SAS, 2009) Issa-Zacharia, A.; Morita, K.; Kamitani, Y.
The stability of Slightly Acidic Electrolyzed Water (SAEW) on storage was evaluated. SAEW samples of known initial Oxidation Reduction Potential (ORP, mV), pH and available chlorine concentration (ACC, mg/L) were stored at 25℃ in different containers and changes of ORP, pH and ACC were monitored daily for a period of 10 days. ORP, pH and ACC were respectively maintained at 900-1000mV, 5-6.5 and 10-30mg/L. SAEW was further evaluated for its microbial inactivation effectiveness on the aerobic microflora present on spinach (Spinacia oleracea L.) expressed as aerobic plate count (APC) and was compared to Sodium hypochlorite (NaOCl) solution. The decontamination was done by dipping spinach samples with or without a pre-washing step into treatment solution for 5min. SAEW (pH 5.5, 25mg/L ACC) achieved a significantly higher microbial reduction than NaOCl solution (pH 9.9, 103mg/L ACC). While pre-washing of spinach in running tap water for 5min increased the microbial reduction by SAEW from 1.3 logo colony forming units (CFU)/g to more than 2 log10 CFU/g at 5min contact time, increasing exposure time did not significantly affect its antimicrobial effectiveness on spinach aerobic microflora.