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

Constructed wetlands – zero liquid discharge

Constructed wetlands for waste water – zero liquid discharge, in the Poiana Florilor neighborhood of

Piscu Romania

We built in the Poiana Florilor district of Piscu Ciolpani, South – Muntenia, Romania, for the evacuation of wastewater, five constructed wetlands, with zero liquides discharge, equipped with a device for the evacuation of wastewater purified from the constructed wetland only by forced evaporation, DAUZUC. The water treated by the constructed wetland is discharged to the atmosphere and not on ground, in soil or watercourses. DAUZUC uses only natural processes: capillarity, basket effect and evapotranspiration without: energy or chemicales consumption and does not require periodic emptying.

The overall goal is to implement nature-based solutions on a larger scale to increase resilience to climate change. The project was addressed to the target group of the community of residents from the neighborhood „Poiana Florilor”, Piscu. The neighborhood is located 30 km from Bucharest, and is spread over a total area of about 2 ha, of which 0.5 ha are common spaces – access road, parking and green spaces. It comprises 25 plots, five of which have completed houses and an agro-tourism guesthouse, a craft workshop where specific activities are carried out with the aim of promoting and training a life in harmony with nature. The objectives were: the natural purification of waste water with the help of constructed wetlands, equipped with a device to discharge the purified waste water from the constructed wetland only by forced evaporation, DAUZUC. The water treated through the constructed wetland is discharged into the atmosphere and not into the soil, onto the ground or watercourses, as in the case of sewage treatment plants and septic tanks, by using natural processes: capillarity, chimney effect and evapotranspiration, without: consumption of energy or chemicals and without periodic emptying. More than that: the complete placement in the greenhouses ensures the water needs of the crops. Other objectives were: educating the inhabitants to understand the concept of sustainability by explaining it and the concepts of green infrastructure and the notions of climate change, constructed wetlands, harmonious integration in nature, capitalizing on the collaboration of different profiles of people (for example: school students , elderly, people at social risk). exclusion) to build a better community, convincing locals and visitors, but also the general public, that both centralized sewerage and the use of drainable watertight basins, septic tanks or micro-wastewater treatment plants are solutions that do not respect nature. During ….we built five DAUZUC constructed wetlands.

1) Implementation in an ecological neighborhood of constructed wetlands with forced evaporative discharge of purified wastewater, a nature-based solution, resistance to climate change.

Five such systems have been installed, serving individual homes and an eco-friendly guesthouse.

The project is an example. contributing to several Green Deal objectives such as: and infrastructure planning to reduce costs, provide climate-resilient services and improve compliance with the requirements of the Water Framework Directive for better ecological status.

2. Educating residents to understand the concept of sustainability by explaining it and the concepts of green infrastructure and notions of climate change, built wetlands.

Beneficiaries and other residents of various ages and professions participated directly.

Learning by doing these concepts and actions can serve as an example.

3. Convincing local residents and visitors, as well as the general public, that both centralized sewerage and the use of septic tanks for emptying, septic tanks or micro-treatment plants are solutions that do not respect nature.. I have convinced that all these solutions are more expensive, they affect nature and are subject to the negative effects of climate change and that centralized sewage and treatment systems consume energy, chemicals. For centralized sewers and associated treatment plants, the increase in wastewater retention time due to drought and water economy will lead to changes in the composition of the influent wastewater. These lead to accelerated corrosion for the treatment plant, which can reduce the life and integrity of pipes, valves and other components.

In order to bring the aesthetics of nature into the spaces where we build the wetland, we have chosen native plant species that are the most suitable for the local environment. These native plants look healthy year-round, changing their appearance with the seasons and attracting local birds and insects to increase the area’s biodiversity. It ensures not only a beautiful and natural area, but eliminates the need for maintenance resources (personnel, materials, water , for crop maintenance). The green infrastructure, with the wetland built by forced evaporation integrated, it fits harmoniously into the nature that surrounds it, the Infrastructure It is designed after the concept of biophilia : love for the nature and for other living beings. The design biophile imitate the nature in the spaces exteriors of the buildings we spend our time in, incorporating different elements of nature outdoors with the goal of improving people’s health and well-being. The location of green infrastructure is chosen so that its construction in a strong and beautiful communal area delights citizens and helps to increase and protect local biodiversity.

In order to bring the aesthetics of nature into the spaces where we build the wetland, we have chosen native plant species that are the most suitable for the local environment. These native plants look healthy year-round, changing their appearance with the seasons and attracting local birds and insects to increase the area’s biodiversity. It ensures not only a beautiful and natural area, but eliminates the need for maintenance resources (personnel, materials, water , for crop maintenance). The green infrastructure, with the wetland built by forced evaporation integrated, it fits harmoniously into the nature that surrounds it. The Infrastructure is designed after the concept of biophilia : love for the nature and for other living beings. The biophile design imitate the nature in the spaces exteriors of the buildings we spend our time in, incorporating different elements of nature outdoors with the goal of improving people’s health and well-being. The location of green infrastructure is chosen so that its construction in a beautiful communal area, delights citizens and helps to increase and protect local biodiversity.

Aplying technology costructed wetlands and building green infrastructure has given everyone, an opportunity to work together to return an occupied space to nature, creating a healthier ecosystem for people and a new space for citizens to enjoy and observe nature, all while promoting learning, dialogue and a better community.

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