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WASTEWATER TREATMENT : Equipment, Systems, Technologies

Interior and exterior plumbing, sewage, for: homes, schools, hostels, residential, little towns





Without emptying


Without maintenance


No electricity consumption


Environment friendly


WWTP with fixed film biological reactor with  effluent discharge by evaporation 


The purification of waste water with DAUZUC, intensively reproduces, in a constructed  wetland, the phenomena of self-purification of soils and underground water.

The process is continuous and consists of:

– Mechanical treatment in the filter tank, in which, when the waste water enters the tank, the liquid part enters the horizontal slotted pipes that pierce the tank, through the slots inside it and exits through the slots outside the tank into the granule bed . Organic bodies larger than the slit are preserved.

– Biological treatment in the filter tank by aerobic and anaerobic digestion, carried out by aerobic and anaerobic microorganisms existing in the wastewater but also migrated from the soil layer, until total or partial liquefaction, until the organic bodies reach the size of the section of the pipe slits horizontal channels that pierce the filter tank where anaerobic digestion of biodegradable materials alternates with aerobic digestion depending on the variation of wastewater flow and bed loading. Aeration is carried out by the circulation of air between the vertical suction pipe and the vertical gas exhaust pipe, due to the chimney effect but also due to the air that enters together with the waste water through the influent sewer pipe and also through the natural channels and those created by the roots of the plants the soil layer that communicates through the filter membrane with the bed of crushed or sifted mineral granules or randomly arranged plastic material elements. Due to the turbulence generated by the periodic level variations and the vortex created when the waste water enters the cylindrical tank of the filter tank, biodigestion is amplified, the liquefaction time being significantly reduced. In the filter tank, denitrification is carried out in the anaerobic phase to remove gaseous nitrogen, after nitrification in the constructed wetland and the anoxic phase to remove phosphorus.

.- Biological treatment in the bed of granules, the filter membrane and in the soil layer in which the liquid drained through the gaps in the bed is purified by the fixed biological film, which forms in the gaps between the stones in the bed and in the soil layer. The aerobic digestion of biodegradable materials takes place by the stationary bio-environments existing in the ground which, due to the variable flow rate of the waste water and the level variation in the multilayer, is submerged and alternately aerated, every time the upper level of the reservoir is exceeded, by the water from the interior of the tank and its withdrawal due to capillarity and evapo-transpiration. Aeration in the bed and soil is enhanced both by convection caused by the movement of water through the granular medium and by diffusion of air from the surface into the layer of granular material by absorption into porous media. Ammonium nitrification occurs due to chemoautotrophic bacteria, but also denitrification by aerobic microorganisms when dissolved oxygen consumes oxidized nitrogen instead of oxygen and due to anaerobic microorganisms. Nitrites and nitrates are converted into gas, in the form of dinitrogen (N2). Due to the organic loading of the earth and the permanent aeration, phosphorus reduction also occurs. <h1>- Mechanical treatment in the bed of crushed or sifted mineral granules or randomly arranged plastic material elements, the filter membrane and in the soil layer, through which small and medium-sized solid suspensions are filtered and are retained in the voids of the bed, being evacuated by periodic washing by inserting and extracting the washing water through some holes at the base of the vertical pipes.

– Evacuation of treated water by capillarity and evapo-transpiration