Anaerobically with biological system growth biofilm bed expanded sumerso

摘要

The system claimed is based on a process of growing biomass in film created on a submerged expanded backing with bed expanded by downward flow. The flow rate necessary for said expansion is obtained at the expense of the nominal flow rate of effluent, to which is added the elevated rate of recirculation. This elevated rate of recirculation is induced by injection of biogas, which translates into high energy efficiency, inasmuch as both the recirculation and the expansion of the backing bed for the biofilm are obtained by the biogas itself. Said mechanism of injection of biogas will create a liquid column of lesser density, which is the determining factor in the hydraulic head difference capable of creating said flow rate. The process takes placed in a biological reactor, figure 1, comprised of chambers 1, 2, 3 and 4, where the submerged filling 1A, 2A, 3A and 4A of backing pieces for the biofilm is retained. The chambers are connected to form a vertical series. The effluent being treated crosses the various chambers of the reactor in descending flow and its total flow rate of the circulating flow rate and an elevated recirculation rate produces an expansion in the filling, generating a random movement in its elements which favours contact with the biofilm and facilitates the continual removal of the excess biological sludge building up in the sludge concentrator 5. The entire process occurs without contact with the oxygen of air and the recirculation of the effluent realised from the lower end 6 of the reactor to its upper end 7, is achieved by a system of two liquid columns of different density 8, utilising the actual biogas generated in the installation. Not requiring any submerged moving part or equipment - an indisputable advantage of this system - it has elevated energy efficiency, as well as an elevated efficiency for an expanded-bed growth system, enabling an elevated hydraulic head. IMAGE