Patent ID: 7437267

Claim:
A sewage inflow prediction apparatus which provides sewage inflow prediction for a sewage treatment facility comprising: a case base generated from historical data including inflow data that indicates a sewage inflow previously measured at the sewage treatment facility and meteorological data corresponding to the inflow data; and prediction means for detecting a substantially similar case corresponding to an input prediction condition from said case base and predicting a sewage inflow on the basis of the detecting result in real time, wherein first inflow data that indicates a sewage inflow measured at a first time and second inflow data that indicates a sewage inflow measured after a predetermined prediction time from the first inflow data are used as the inflow data, meteorological data corresponding to the second inflow data is used as the meteorological data, an inflow parameter that indicates a sewage inflow newly measured at the sewage treatment facility and a meteorological parameter obtained by meteorological prediction are used as a prediction condition, said case base has a plurality of input spaces, which are quantized in accordance with a desired output allowable error, the first inflow data and meteorological data included in historical data and at least one representative case is provided for each of the input spaces, the case base has an output value that represents at least one historical data arranged in at least one space of the plurality of input spaces on the basis of an input variable value, said prediction means searches the case base for detecting a substantially similar case corresponding to a new prediction condition as an input variable value and estimates inflow prediction data corresponding to the new prediction condition using an output value of the detected substantially similar case, the sewage inflow prediction is not created in advance based on physical laws, the sewage inflow prediction is used by the sewage treatment facility to control sewage purification treatment, and when a plurality of historical data are distributed on one input space of the plurality of input spaces, an average value of outputs of the plurality of historical data is used as an output value of the at least one representative case and a median of one input space is used as an input value of the at least one representative case.