TECHNOLOGIES
FLOTATION PLANTS
A flotation plant efficiently separates solids and oils from water.
BioAqua designs and manufactures rectangular and cylindrical flotation units, typically combined with a flocculation stage upstream and sludge dewatering downstream. Before the water enters the flotation tank, it is flocculated so that the very fine particles in the wastewater form small flocs. When mixed with microbubbles, these bubbles attach to the flocs and provide buoyancy, causing them to rise to the surface as a concentrated sludge layer that can be skimmed off.
The microbubble pump that produces the dispersion water is usually installed directly beneath the flotation tank and uses the floated, treated water as its source. The flotation plant can be configured either for bulk removal of sludge or as a polishing step for removing very fine residual particles.
BIOREACTORS
Bioreactors are biological treatment systems that remove organic compounds and nutrients from water. They work by establishing a biofilm of microorganisms that consume organic matter and convert it mainly into carbon dioxide, water, biomass (sludge), and, under suitable conditions, nitrogen gas.
BioAqua's aerated bioreactor is based on advanced submerged biofilm technology, providing efficient and stable wastewater treatment under a wide range of operating conditions. Each unit includes an integrated aeration system and only requires an electrical power connection for operation.
Depending on the site, the bioreactors can be installed as stand‑alone tanks, buried systems, or floating units. This flexibility makes the technology suitable for both permanent and temporary installations. The stand‑alone units are modular, so plant capacity can easily be scaled by adding reactors, and complete systems can be relocated if operational needs change. Submerged systems are particularly advantageous in cold climates or locations with limited space.
MICRO & NANOBUBBLE SYSTEM
Micro‑ and nanobubbles are used in a wide range of applications, including oxygen enrichment, ozonation, flotation, and cleaning. BioAqua supplies Nikuni microbubble generators, which form the core of our flotation systems.
Together with our specially designed nozzles, they provide an efficient solution for separating solids and oil from water. When the nozzles are placed directly in the wastewater stream, the tiny bubbles attach to suspended particles, lifting them to the surface.
Nikuni pumps are available in a wide range of sizes, from small test units to large‑scale plants, and can be supplied in SS304 (standard), SS316, cast steel and, in selected versions, duplex stainless steel. For specialized applications, BioAqua can also integrate electro‑flocculation and other complementary treatment technologies.
DRYING MATTER –
SLUDGE AND BIOMASS DRYING
Sludge and biomass can be dried to above 90% dry matter using BioAqua's Drying Matter technology. The feed is wet sludge or biomass, typically containing 60–85% water. During the drying process, the material is exposed to dry air that circulates continuously in alternating saturation and drying cycles.
This dry, slightly heated air becomes saturated with water vapour as it passes through the wet sludge. The moisture is then removed on a cooling surface, where the water condenses out of the drying air. The result is a dry, stable sludge with water content as low as 5%, and a separated water fraction that can be discharged or reused as process water.
Using BioAqua's Drying Matter systems, it is possible to achieve an energy consumption of approximately 300 kWh to evaporate 1,000 kg of water. This high efficiency is obtained by using heat pump technology, in which both cooling and heating are generated within the same closed process.
SLUDGE DEWATERING –
SCREW PRESS SYSTEMS
Our sludge dewatering solutions are based on advanced screw press systems designed for efficient and energy‑saving operation. The process separates water from raw sludge and produces a dry, easy‑to‑handle sludge cake with minimal operator attention.
First, the liquid sludge is flocculated and then pumped into a screw cylinder. The cylinder consists of alternating fixed and moving rings with a central screw that slowly transports the sludge forward. As the sludge moves through the cylinder, water drains continuously through 0.5 mm gaps between the rings. Gradually, the sludge becomes drier until, in the final section, it is compressed into a cake and discharged automatically.
The slow‑moving screw press ensures low energy consumption and reliable, low‑maintenance operation. The screw press can be closely integrated with our flotation units, creating a compact, automated sludge handling line. Depending on solids content, typical capacities range from about 10 kg DS/h up to 300 kg DS/h.
FILTRATION & ULTRAFILTRATION
Ultrafiltration is used in a wide range of installations for tasks such as bacteria removal, water clarification, drinking water production, technical water reuse, oil‑water separation, and phosphorus capture. This versatile technology delivers reliable water quality, even when operating conditions vary.
BioAqua designs and supplies filtration systems using the most suitable media for each application. Options include ceramic filter elements, flexible filter media with easy, non‑chemical backwash, and other advanced filtration technologies. To optimize performance, ultrafiltration units are often combined with appropriate pretreatment, such as coarse separation, flotation, or flocculation. By tailoring each system to the specific process, BioAqua ensures high efficiency, long service life, and low maintenance requirements.