The vermifilter BIDATEK® is a revolutionary biological system for wastewater treatment that combines sewage treatment with the degradation of the pollution retained during the treatment, thanks to the action of an earthworm population (eisenia foetida).
The biological technology BIDATEK®, distinguished itself by being ZERO WASTE, as the treatment process does not generate sludge. On the contrary, pollution is transformed into worm humus that may be used as agricultural fertilizer.
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Vermifilter BIDATEK® technology belongs to the family of biofilm processes or biomass solid support processes, but it marks a change in the concept of sewage treatment, as it transforms a waste product (wastewater) into three resources (treated water, organic fertilizer and worms). This represents a perfect example of “circular economy” transforming waste into valuable byproducts.
The effluent comes out by the bottom of the filter, with a percentage of BOD elimination higher than 80%. Besides, the pollution retained is degraded transforming into worm humus, suitable to be used as natural fertilizer. Consequently, an advantage of the filter is that it does not generate unstable sludge and transforms contamination into natural fertilizer. To understand the operation and the characteristics of our BIDATEK® technology, videos and photographs are available on our webpage.
A fine grain substrate in used as support, where the biomass is fixed together with an earthworm “eisenia foetida“ population. The functioning of the system consists in spraying the wastewater on the top filter surface; water runs through the filter layers and pollution is retained in the substrate and digested by the earthworms and the existing microbiology, without any need for reagents or consumables.
The construction of the tank where the layers of the vermifilter are placed may be done by two techniques:
OPTION 1: VERMIFILTER IN CONCRETE
Concrete tank (walls and floor).
OPTION 2: HALF BURIED VERMIFILTER
Walls in HDPE sheet and floor in reinforced concrete.
The pre-treated wastewater is pumped to the top part of the vermifilter and homogeneously distributed through the whole surface of the vermifilter with Bidatek irrigation systems “BIDA-RIEG Pivoting-Central” or “BIDA-EXCEN Multipoint).
El vermifiltro BIDATEK® se compone de distintos sustratos seleccionados para conseguir el tratamiento del agua y la degradación de los sólidos.
Para la construcción del vermifiltro se utilizan los siguientes rellenos:
La elección de los sustratos y las cantidades de éstos, está relacionada con los caudales y cargas de agua tratar, y serán definidas de forma personalizada para las necesidades del cliente.
Artificial wetlands are natural treatment systems formed by lagoons or shallow channels, filled with gravel and sand, where aquatic vegetation is planted. In these systems, decontamination procedures take place through the interaction among water, filtering fillers, microorganisms and vegetation.
In the subsurface flow constructed wetlands the wastewater flows under the ground through a granular medium in contact with the roots and rhizomes of the plants. The depth of the water sheet is usually between 0.3 and 0.9 m. The biofilm grows adhered to the granular medium, roots and rhizomes of the plants and plays a fundamental role in the processes of water decontamination.
Subsurface flow wetlands can be further classified as horizontal flow or vertical flow constructed wetlands.
SUBSURFACE HORIZONTAL FLOW CONSTRUCTED WETLAND
The water flows horizontally through the granular medium and the rhizomes and roots of the plants. The depth of the water is between 0.3 and 0.9 m. This kind of wetland works permanently flooded (water is found between 0.05 and 0.1m below the surface) and with loads of around 6 g BOD/m2/day.
SUBSURFACE VERTICAL FLOW CONSTRUCTED WETLAND
This kind of wetland was developed as an alternative to horizontal wetlands in order to produce nitrified effluents. Vertical systems are generally combined with horizontal systems, so nitrification and denitrification processes take place progressively, eliminating the nitrogen. Water flows vertical and is distributed by pulses, so that the granular medium is not permanently flooded. The depth of the granular medium is between 0.5 and 0.8 and they operate with loads of around 20 g BOD/m2 per day.
Vertical systems have a greater capacity of treatment than the horizontal ones (they require less surface to treat a certain organic load). On the other hand, they are more susceptible to clogging.
Subsurface Constructed Wetlands are ecological wastewater treatment systems.
Applications for this type of wastewater treatment plants:
BIDATEK offers engineering services for the design of treatment plants equipped with both:
Vaso de humedal
ejecutado en gaviones
Instalación de lámina PEAD
Vaso de humedal ejecutado en hormigón
y utilización de celdas plásticas drenantes.
Tratamiento de aguas industriales.