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| Monitoring and early alarming technology of sewage treatment plant based on frequency analysis |
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Abstract In view of the inadequate data use of monitored pollution sources and the failure to early alarm pollution accidents in China, this study used frequency analysis equation to calculate the concentration of different occurrence rates and developed an emergency plan based on thorough analysis of the monitored COD data from a sewage treatment plant in the S city. Effluent concentration from the treatment plant ranged from 40~60mg/L, and the COD concentration was higher at 16:00, 20:00, and 22:00, at which hours the exceedance rate was high and monitoring and control should be strengthened at these times. The threshold frequency of exceedance can be set as 30%, 20%, 10% and below 10% for the normal, regular, abnormal and extremely abnormal status of the treatment plant, respectively. The emergency status was examined using monitored data of the year in terms of the threshold concentration at the different hours, and the result indicated that the emergency rate of the normal, regular, abnormal and extremely abnormal status in the year was 70.4%、9.9%、9.8% and 9.9%.
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Received: 09 March 2012
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