Robert Brehm - Peer Locher - ATV - Jord og Grundvand

Robert Brehm - Peer Locher - ATV - Jord og Grundvand

Ultra-sonic Water Well CleaningRegenering af boringer med highpower ultralydVandCenter SydMads Clausen Institute, SDUFunded by Vandsektorens Teknologiudviklingsfond (Project: 7300)Robert Brehm, Mads Clausen Instituttet, Syddansk UniversitetPeer Locher, VandCenter Syd

Project Introductionroject partner: VandCenter Syd, Mads Clausen Institute (SDU), InFluxnded by: Vandsektorens Teknologiudviklingsfondmeframe: Jan. 2012 – Dec. 2012udget: ~2.0 Million DKKrojektpartnerne udvikler et ultralydsbaseret, miljøvenligt og energieffektivt værktøj tnsning og regenerering af grundvandsboringer. Boringen bliver dermed mere effektiregenerering foretages i én, tidsbesparende work investigates the usage of high power ultra-sonic push-pull transducers thabilitate water wells in contrast to conservative well rehabilitation methods. We compare thfectiveness of the ultrasonic cleaning method with state-of-art conventional cleaning methodch as brushes and chemical acids.addition the task is to study the effectiveness and level of cleaning for different filter gravanularities and geology compounds around water wells.

Water Well AgingWells clogg over time and thereby theefficiency of the well declines.Physical and chemical processes causethe hydraulic conductivity of the wells filterpipe and gravel pack to decline whichresults in a higher draw-down at the samedischarge rate or with a loss in thedischarge rate.- Gravel coatings consists mainly of ironand manganese- The pore volume fills up with fine sandsand silt- Incrustations in the formation

An aged WellBefore and after mechanical cleaning

se of known Ultrasonic Cleaning Technology

Push-Pull Transduceresonator rod induce longitudinal pulses in the resonator at the points of attachment.ansducers inside each end cap produce cyclic positive and negative pressure waves.e positive pressure wave acts as a pushing force and the negative pressure wavts as a pulling force (hence "Push-pull").e pushing and pulling action causes the rod to resonate at the frequency of operationa result, near perfect, omni-directional radiation of sound waves is achieved.

Ultrasonic Cleaning EffectsMicro-motion:Micro-motion as resonance causes rubbing of thefilter gravel stones at each other. Coatings will berubbed off if not completely hardened.Oscillation:The gravel stones will start volume oscillating andcoatings are spelled off.Fluidise thixotropics:The ultrasonic energy is used to fluidise thixotropiccements, cut and break molecular lattice of gels,slime, colloidal substances

The test well (tank) cleaning setup

Determination of cleaning efficiencyasurement of the flow rate by letting a fixed volume of water flow through a fixed volume of gravel sample.fferent samples and a reference ”clean” sample have been tested. (Darcy test)Water reservoirValve (slider)Tubewith gravelFine mesh~400mmØ ~50mm

Proof-of-Concept Experiments Results

Recent results in water well modelDirty Gravel Sieved1 2 3CLEANREFERENCECleaned TOP(15‐20cm away)Cleaned BOT(15‐20cm away)Cleaned TOP(10cm away)Cleaned BOT(10cm away)67,62 50,6 53,28 53,97 51,34 48,7164,1 66,43 51,81 45,03 47,16 51,12 55,1568,18 55,19 58,57 46,6 44,29 57,6967,47 68,91 48,66 58,81 40,87 54,03 52,2865,97 65,09 50,32 54,28 53,47 54,5 56,3566,5 69,35 51,19 55 54,28 52,18 44,6567,91 68,09 52,72 50,6 44,25 44,29 55,0970,75 59,94 50,19 56,59 43,19 50,78 54,06Mean 67,1166667 66,70125 51,335 54,02 47,97375 50,31625 50,996875Std. 2,22489251 3,05282276 1,966250965 4,540981643 5,287394545 3,951668499 4,914188094Flow l/min 0,89 0,90 1,17 1,11 1,25 1,19 1,18

erification of results with real core samples from a pollutedwell inside a tank.75cm core sample from a sonic drill boreholecleaned by the ultrasonic push-pull transducerTime in seconds for 1liter to pass through a fixed volume of gravel.

In-Situ testing and verification at a real well.Quantitative verification using a high range turbidity sensor andqualitative visual verification of the cleaning effect using an underwater camera.Cameraasonic Probener well tubeGravel pack

Turbidity and Video inspection results.20data 115relative Turbidity in Tu units1050-5-1080 90 100 110 120 130Time in minutes

athematical modeling of sound propagation inside the wellFilter tube barrier (signal loss ~70%)

Measurement of sound propagation inside the tank model usinghydrophones:… Compared to the model … wave lenght maxima/minima every:

Improvements to compensate for the intensity lossss reduction by improving the accoustic bridge by means of direct contact between thensducer and the filter tube.TransducerActive Transducer AreasFilter tubeFilter TubeBefore improvementAfter improvement

… Currently ongoing …onsisting of:Further testing to improve the sound intensity outside the filterNew design of the ultra-sonic deviceurbidity measurements of discharged waterydrophone intensity measurement at different distances from the wellamera inspection during treatment

Ultralyd test ved V3E i OdenseSonic Drill kerneboringer omkring en ældrevandværksboring.6 kerneboringer til 18 meters dybde.Med udtagelse af fulde kerneprøver fra 4,5 til 18 m.u.t.

Kerneboring til dokumentation af tilklogning af boring

Sonic Drill Core sampling

Kerneprøver fra formationen

Special thanks to:or providing the most accurate in-situ “MultiSense TuX High-Range Turbidity Sensor”r the In-Situ turbidity measurements.For funding the projectFor providing the project withpurpose built specialized testequipment.

For further information or discussions please contact:eer Locher, tlf.: 61 63 23 71,, mobil 40 80 84 62andCenter Syd asandværksvej 7, 5000 Odense Cww.vandcenter.dkobert BrehmCI, Mads Clausen Instituttet, 6400 Sønderborg, tlf.: 65501612, visit:ttp:// 7300>

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