Patent FR-2986522-A1 (FR)
Title: Treating liquid effluent supplied at rate of constant flow, comprises determining value of volume of reference, dividing volume into first and second digesters, inoculating second digester by microbial ecosystem, and dividing constant flow
Inventor: RAPAPORT ALAIN
IPC: C02F3/00
Filed: 2012-02-07
Abstract: The method comprises determining (20) a value of a volume of reference (V) of a reactor supplied with a constant flow (Q), dividing (30) the volume into a first digester of a first volume (V1) and a second digester of a second volume (V2) such that a sum of the first and second volumes is equal to that the volume of reference, inoculating (10) the second digester by a microbial ecosystem to convert a part of a substrate and to present an inhibition of growth by the substrate in an initialization phase, and dividing (40) the constant flow into a first flow and a second flow. The method comprises determining (20) a value of a volume of reference (V) of a reactor supplied with a constant flow (Q), dividing (30) the volume into a first digester of a first volume (V1) and a second digester of a second volume (V2) such that a sum of the first volume and the second volume is equal to that the volume of reference, inoculating (10) the second digester by a microbial ecosystem to convert a part of a substrate and to present an inhibition of growth by the substrate in an initialization phase, dividing (40) the flow into a first flow and a second flow such that the first flow supplies exclusively the first digester, and the second flow supplies initially second digester before being redistributed in the first digester. The method further comprises predetermining (11) a target value of concentration in the substrate, in which the first volume (V1=rV) is a percentage volume of reference with r as a parameter, the second volume (V2=(1-r)V) is percentage complementary to the volume of reference, the second flow (Q2=alpha Q) is a percentage of the rate of constant flow with alpha as a parameter, and the first flow (Q1= (1-alpha )Q) is complementary percentage to the rate of constant flow; determining (50) a dilution ratio of the second volume of the second digester and the dilution rate to be less than the value of the curve growth of the data on the microbial ecosystem for the given substrate; deducing a concentration value in the substrate corresponding to that of the dilution ratio from the growth curve; determining a set of values according to the value of the dilution rate and the value of the dilution ratio; choosing a subset of values from the determined set of values; determining a function representative of a speed or specific contribution in the substrate in the first digester at a given concentration based on a value of the parameter; selecting a value from the chosen values such that a variation curve of the function meets a graph of the function at more than one point; selecting a value from the chosen values such that the variation curve of the function does not meet a graph of the function at more than one point as the single point corresponds to a value of concentration in the weakest possible substrate; comparing the output concentration with the target value; and modifying the value of the parameter and/or the dilution ratio according to the result of the comparison. The volume of reference is equal to the rate of constant flow divided by a dilution rate, where the dilution rate is equal to a value of curve growth on microbial ecosystem data for the given substrate at a predetermined target value. An independent claim is included for an effluent treatment system.