RESEARCH OF RHEOLOGICAL CHARACTERISTICS OF RAINFALL OF SEWAGE

One of problems of transfer of the rainfall of sewage (OSV) is use of impeller pumps for these purposes. Now displacement pumps, in particular screw are used. Application of impeller pumps is limited due to the lack of rheological characteristics of flowed through environments in this connection impeller pumps apply in the main ambassador of a dilution of OSV water that leads to padding energy consumptions.

Definition of rheological characteristics of OSV will allow to recommend impeller pumps for their transfer and will define their opportunities.

It is for this purpose offered to use a method of a capillary viscosimetry for definition of rheological constants (the ultimate strain of shift and viscosity) which characterize OSV which current is described by model of viscoplastic liquid.

Definition of rheological constants of rainfall of sewage was carried out on production installation where performance characteristics of pumps with simultaneous definition of the OSV viscoplastic properties were removed.

Rheological constants OSV were defined by method of the accounting of hydraulic resistances on the fixed site of a round pipe depending on an expense of OSV and its concentration in the assumption that the current mode laminar.

 It is established that unlike the Newtonian liquids all curve currents in a pipe depending on its concentration pass not through an origin of coordinates, and intercept that indicates the OSV viscoplastic properties. Driving begins to happen only after when pressure in a pipe is more than pressure of the ultimate strain of shift.

 The research of rheological behavior of OSV showed that the main characteristics of the studied OSV are the ultimate strain of shift and plastic viscosity which depend on concentration of suspension.

Results of an experiment show that change of rheological characteristics of OSV depending on concentration depends on change of characteristics of pumps and corresponds to the existing recommendations about transfer of OSV pumps without watering.

 Dependence between rheological characteristics of rainfall of sewage and their concentration is established.

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