Microbubbles Generator
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1 Microbubble for the environment Microbubbles Generator UµBF model SLQI Systems 6 rue Louis Pasteur Boulogne-Billancourt France Tel. +33(0) Fax. +33(0) contact@slqi.net
2 Microbubble for the environment Today, mankind feels more concerned about all the issues that arise from water management. Water treatment has become a major problem that affects many different areas: sanitation, shellfish purification, river maintenance, ponds and lakes... The 2006 Grenelle Environment Forum set an action plan in the line of the European Directive of 2000 to obtain a good ecological status of water in Our microbubbles system is a real progress to respond to these environmental and sanitary issues. Multiple characteristics of microbubbles allow their extended action, more efficient and more respectful with the environment (no shedding) than other current devices. MICROBUBBLES QUALITIES FOR WATER TREATMENT Gas high solubility: Microbubbles of 50p. (< 0.05 mm) disappear naturally after the gas dissolution. The chain operates: Gas is dissolved bubble shrinks the internal pressure increases bubble is dissolved. No waste rejected: As microbubble is dissolved, no waste is created. Microbubble restores and maintains the ecosystem by oxygenating and purifying the environment in which it operates, without any additional discharge. Natural electrical charge: External surfaces of microbubbles are negatively charged and the load is proportionally larger when ph is higher. That is why microbubbles attract more micro-organisms present in the water to be treated. Laminar flow: The bubbles flow elapses like a fluid on a regular way: bubbles with uniforms spherical shapes rarely flows in a turbulent way but provide a laminar flow. High internal pressure: Important difference between internal and external pressure (cf. Young Laplace equation) resulting in a higher load.
3 Advantages of Microbubbles EXTENDED ACTION Greater contact area between air and water In 1 m3 filled with microbubbles, the contact area between water and bubbles is 1000 times greater than with normal bubbles. A bigger contact area improves the efficiency and the reaction of the bactericidal action. MORE EFFICIENT ACTION Bubbles (left) and Microbubbles (right) journey Bubble buoyancy is proportional to the volume of air contained. So microbubbles have minimal buoyancy and remain in the water for a longer time. Microorganisms, irrespective of sizes, are brought to the surface During their journey, bubbles outweigh suspended solids to the surface. Normal bubbles fail catching big organisms but microbubbles are able to penetrate all the contaminants notches and completely encircle them, bringing them to the surface.
4 Microbubbles Generator: How does it work? THE UµBF PRODUCT (NOZZLE) It is a Venturi Tube which will generate microbubbles through a Vortex. The system combines a high flow rate pump, which pumps the water to be treated and the tube is going to drive back the water charged in microbubbles to the basin to be treated. MICROBUBBLE CREATION To create the microbubble, the nozzle will operate according to two principles: Venturi: suction phenomenon that allows supplying a fluid on air (or another gas inspired or insufflated). Vortex: The fluid (water) accelerated to more than 25m/s in the injector created in his center a spiral that will create microbubbles by shearing. OUR DIFFERENT ASSEMBLIES Distributed Solo THE GENERATOR IN PICTURE Duo Star
5 Application fields Environment: Water maintenance and stagnant odor treatment (pond, river, basin, pool...), recovery and maintenance of the ecosystem... Agriculture Food Industry: Wastewater treatment, sewage plants, separation of water/oil/pesticides, water purification... Aquaculture: Shellfish and fish farming, ripening Barrages, private and public parks, canals, ponds, rivers, basins, harbors, boats fairing
6 Our latest conducted tests RE-OXYGENATION MEASURES 8,00 7,00 Dissolved oxygen (mg/l) 6,00 5,00 4,00 3,00 2,00 1,00 0,00 0,000 1,000 2,000 3,000 4,000 Traditional bubble diffuser Time (Hours) UµBF-15 SLQI diffuser Oxygenation test (400L tank - Freshwater): * Increase of dissolved oxygen measured in mg/l with the diffuser UµBF-15. GOING FURTHER Dissolved oxygen (% saturation) Pool without SLQI nozzle (blank) Pool with SLQI nozzle UµBF-21 (air LO2/min) Nozzle OFF Slight variations in Oxygen dissolved Percent Saturation are due to changes in temperature water as well as atmospheric pressure ambient. 100 Day 1 Day 4 Day 6 Day 7 Day 8 Day 9 Day 11 Day 13 Day 14 Day 17 Day 18 Day 19 Day 20 Day 21 Test performed in two distinct basins (pool-type) from 60m3 filled with filtered seawater, without animals. ** Increase of dissolved oxygen percent saturation with the SLQI UµBF -21 diffuser.
7 BACTERICIDAL ACTION Test 1: Effect on Vibrio bacteria Number of CFU/mL T0 T0+15 T0+30 T0+45 T0+60 Evolution in time of the number of Vibrio (nozzle UµBF-21 air + 3 L O2 /min) 7 m3 basin - seawater: ** Bactericidal activity diffusing a mixture of air + O 2 with the UμBF-21 nozzle. There is a progressive decrease in the number of vibrio in function of the time of treatment. In one hour, 58% of vibrio were removed at a flow rate of air enriched with 3 L O 2 / min. Test 2: Effect on fecal origin bacteria - E. coli Number of CFU/mL Day 1 Day 4 Day 6 Day 7 Day 8 Day 9 Day 11 Day 13 Day 14 Day 17 Day 18 Day 19 Day 20 Day 21 Pool without SLQI nozzle (blank) Pool with SLQI nozzle UµBF-21 (air + 1,5 L O2 /min) Nozzle OFF Faeces addition Test performed in two distint basins (pool-type) from 60m3 filled with filtered seawater, no animals: ** The addition of faeces and the system shutdown produces a significant increase in the number of these bacteria. The startup of the nozzle causes a rapid decrease of these bio-indicators, reaching even a complete eradication. At a further addition of faeces and a new shutdown of the nozzle, the bacteria grow again but much slower thanks to the still present O 2 in the water and these bacteria are rapidly removed again.
8 Depending on the amount of O 2 introduced by the generator: - With high doses of O2: oxidative reactions will occur even within bacteria, resulting in the death of the microorganisms (up to the complete sterilization of the treated water). - Spreading low doses of O 2 : the nitrification is going to be favored due to the activation of aerobic bacteria and these ones lead to the degradation of organic material. It is this reduction of available organic mass that leads a reduction in the growth of some pathogens. Therefore the microbubble generator severely limits the development of pathogenic bacteria and allows even its complete elimination without generating sub-products such as chlorine (and chloramines) or bromine (and bromamines). * Source: Data obtained by SLQI Systems tests. ** Source: Data obtained by tests realized by Nausicaá - Centre National de la Mer. Effects in pictures REMOVAL OF ALGAE BLOOMS Canal Sakishima in Osaka (Japan) (0.9x1.6km and 2m deep): Total destruction of blue algae and remediation of odor and quality of the water in one month after the installation of a submersion pump. Permanent maintenance. Before 15 days after 1 month after Filling microbubbles with oxygen allows fighting against eutrophication and propagation of algae in ponds or lakes. Indeed, the brewing generated by the ascension of microbubbles reduces the presence of nitrate and phosphate, which is necessary for the development of algae. REGRESSION OF AQUATIC AND INVASIVE PLANTS We observe, after a few months of treatment, a decrease in the density of various invasive plants (ex. Water primrose willow). Some of these plants are very dangerous since they cause, with their development, the change of the environment threatening the entire ecosystem and inhibiting the endemic flora and fauna growth. Re-oxygenation restores the diversity of species and the original ecosystem.
9 WATER SEWERAGE Fish create waste (excreta, faeces and food refusal) that will little by little sediment. Besides all organisms (algae, fish, insects...), after its death, are going to be decomposed and to contribute to the phenomenon of sedimentation. There are aerobic bacteria that feed on organic material in the water to grow, while causing oxygen consumption. This depletion of the oxygen on the environment no longer allows these bacteria to degrade dead organic material. This results in the pollution of the lake (eutrophication). The oxygenation allows the degradation of dead organic material, and therefore a cleanup of the lake. PHASE SEPARATION On their way to the surface, microbubbles carry with them (because of their negative charge), all organic material in the aquatic environment. This phenomenon allowing the phase separation is very useful for the treatment of wastewater. GENERATOR OF MICROBUBBLE VS AERATOR Microbubble: Efficiency by performance Vertical aerator Horizontal aerator Microbubbles generator Covered area by aerators Covered area by the microbubble generator
10 SLQI Systems 6 rue Louis Pasteur Boulogne-Billancourt France Tel. +33(0) Fax. +33(0) contact@slqi.net
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