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Cross-border network for knowledge transfer and innovative development in wastewater treatment WATERFRIEND HUSRB/1203/221/196 1st HUSRB Students Meeting. 1st Students Meeting Waterfriend. SEPARATION OF OILY WATER BY BED COLESCER Dunja Sokolovi ć

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  1. Cross-border network for knowledge transfer and innovative development in wastewater treatmentWATERFRIENDHUSRB/1203/221/1961st HUSRB Students Meeting

  2. . 1st Students Meeting Waterfriend . SEPARATION OF OILY WATER BY BED COLESCER Dunja Sokolović Faculty of Technical Sciences University of Novi Sad

  3. . 1st Students Meeting Waterfriend . • Oily wastewaters are generated in many industrial processes, such as: • petroleum refining • petrochemical & chemical • industry • food processing • leather production • metal finishing

  4. . 1st Students Meeting Waterfriend . • Oilywatersmay contain: • lubricants • cutting liquids • heavy hydrocarbons (tars,grease, crude oils, diesel oil) • lighthydrocarbons (kerosene, jet fuel, gasoline, etc...) • fats • vegetable oils • fatty acids

  5. . 1st Students Meeting Waterfriend . ENVIRONMENTAL PROTECTION Permitted concentration limit of OIL in wastewater is in the range 15 – 30 mg/l

  6. . 1st Students Meeting Waterfriend . 15 mg of OIL in 1 L of water is how much % of oil in water ???? 0.015 g : 1000 g = x : 100 x = 0,0015 %

  7. . 1st Students Meeting Waterfriend . • oily water treatment: • settlers • deep bed filters • bedcoalescers • centrifuges • adsorbers • membranes • others

  8. . 1st Students Meeting Waterfriend . • oily water treatment: • settlers • deep bed filters • bedcoalescers • centrifuges • adsorbers • membranes • others

  9. . 1st Students Meeting Waterfriend . • oily water treatment: • settlers • deep bed filters • bedcoalescers • centrifuges • adsorbers • membranes • others

  10. . 1st Students Meeting Waterfriend . • oily water treatment: • settlers • deep bed filters • bedcoalescers • centrifuges • adsorbers • membranes • others

  11. . 1st Students Meeting Waterfriend . • oily water treatment: • settlers • deep bed filters • bedcoalescers • centrifuges • adsorbers • membranes • others

  12. . 1st Students Meeting Waterfriend . • oily water treatment: • settlers • deep bed filters • bedcoalescers • centrifuges • adsorbers • membranes • others

  13. . 1st Students Meeting Waterfriend . How to treated the oily water ?

  14. . 1st Students Meeting Waterfriend . Not all oily water is the same !!!!!!! Before the proper oil/water separation technology can be selected • It is important to understand: • the source • nature of oil • and characteristics of oily water

  15. . 1st Students Meeting Waterfriend . Not all oily water is the same !!!!!!! Before the proper oil/water separation technology can be selected • It is important to understand: • the source • nature of oil • and characteristics of oily water

  16. . 1st Students Meeting Waterfriend . • nature of oil Oil solubility is one of most important factors for selection of separation technique part of the oil is always soluble while the other part is dispersed in water Adsorption is an effective and economically reasonable solution only for soluble oil In case of dispersed oil, it is important to know its pour point

  17. . 1st Students Meeting Waterfriend . The oil pour point 1) the working temperature > the oil pour point the dispersion contains two immiscible liquids liquid–liquid system 2) the working temperature < the oil pour point there exists a liquid–solid dispersion

  18. . 1st Students Meeting Waterfriend . Settlers, deep bed filters, centrifuges and membranes are useful and effective for both types of oil dispersions while bed coalescers are suitable only for liquid–liquid dispersions, emulsions

  19. . 1st Students Meeting Waterfriend . • characteristics of oily water • water quantity • phase ration (O/W) • emulsion stability • size of oily droplets • temperature

  20. . 1st Students Meeting Waterfriend . • characteristics of oily water • water quantity • phase ration (O/W) • emulsion stability • size of oily droplets • temperature non-stable emulsion • stable emulsion

  21. . 1st Students Meeting Waterfriend . • characteristics of oily water • water quantity • phase ration (O/W) • emulsion stability • size of oily droplets • temperature

  22. . 1st Students Meeting Waterfriend . When oil droplets are smaller then 80 µm oily water hardly can be treated with settlers, centrifuge, etc…. In this case the best way to treat the oly water is by bed coalescer

  23. . 1st Students Meeting Waterfriend . BED COALESCERS

  24. . 1st Students Meeting Waterfriend . Bed coalescers can operate in two regimes: unsteady-state (deep bed filtration) steady-state (case in our experiments) In steady-state regime, pressure drop is constant with time, and fluid velocity determines its value

  25. . 1st Students Meeting Waterfriend . Steady- state coalescence definite saturated oil exists inside the bed and small inlet droplets coalesce on the surface of saturated liquid inside pores

  26. . 1st Students Meeting Waterfriend . larger drops (globules) detach from the bed and settle behind it

  27. . 1st Students Meeting Waterfriend . Steady state bed coalescer consists of two sections: bed section, settling section

  28. . 1st Students Meeting Waterfriend . Bed coalescence is a very complex phenomenon involving the effects of a large number of parameter

  29. . 1st Students Meeting Waterfriend . • The efficiency of the operation depends on: • emulsion properties • oil properties • the bed characteristics • emulsion interaction with bed material • working conditions

  30. . 1st Students Meeting Waterfriend . • The most relevant properties of a fibrous bed with • respect to bed coalescence are: • physical and chemical properties • morphological and geometrical characteristics • the solid surface size • shape • arrangement • heterogeneity

  31. . 1st Students Meeting Waterfriend . the bed characteristics morphological and geometrical characteristics PU geometrical characteristics can be changed by changing the porosity of the bed

  32. . 1st Students Meeting Waterfriend . the bed characteristics How the porosity/permeability can be changed of the bed ?? - BY COPRESSION OF FIBERS

  33. Efficiency of bed coalescers with different filtermedia Dunja Sokolović Radmila Šećerov- Sokolović Dragan Govedarica . 1st Students Meeting Waterfriend .

  34. . 1st Students Meeting Waterfriend . The bed was formed of polyurethanefibrous,PU, or polyethylene fibrous,PE

  35. . 1st Students Meeting Waterfriend . WASTE POLYMER FIBROUS USED AS BED MATERIAL The PU fibrous were obtained by cutting waste blocks used in the furniture industry

  36. . 1st Students Meeting Waterfriend . WASTE POLYMER FIBROUS USED AS BED MATERIAL PE fibrous were obtained by cutting waste filter media used for kitchen aspirators

  37. . 1st Students Meeting Waterfriend . Important properties of both materials

  38. . 1st Students Meeting Waterfriend . The experiments Separation of four oils different properties using bed of waste PE fibres, and bed of waste PU fibrous over different bed geometry was investigated

  39. . 1st Students Meeting Waterfriend . Properties of oils used for preparation of unstable model emulsions

  40. . 1st Students Meeting Waterfriend . steady-state regime

  41. . 1st Students Meeting Waterfriend . Experimental conditions • permeability 0.18-0.54 mm2 • porosity 0.85-0.97 • Fluid velocity varied from 19 to 40 m/h • Inlet oil concentration was 500 mg/l • The oil concentration in the effluent was determined by FTIR spectrometry

  42. . 1st Students Meeting Waterfriend . Coalescence efficiency was determent Ci = influent oil concentration Ce = effluent oil concentration

  43. . 1st Students Meeting Waterfriend . • Fluid velocity (v) plays an especially important role in waste water flow as it controls: • the capture mechanism and capture probability of droplets • the distribution of dispersed phase per each of the three regimes of oil flow, • the breakup of the retained oil

  44. . 1st Students Meeting Waterfriend . CRITICAL VELOCITY The critical velocity (v*) is define as the velocity at which the effluent concentration of the dispersed oil exceeds 15 mg/L

  45. . 1st Students Meeting Waterfriend . RESULTS

  46. . 1st Students Meeting Waterfriend PU - PE, v = 30 m/s .

  47. . 1st Students Meeting Waterfriend . PU - PE, v*= critical velocity

  48. . 1st Students Meeting Waterfriend . CONCLUSION: • The recycled polyurethane fibrous, PU,show higher efficiency than PE fibrous for all oils in the whole range of fluid velocities • Using bed of recycledPU fibrous higher operating speed could be achieved (40 m/h) what increases the capacity of coalescer • PU recycled fibrous as filter media is not sensitive to the nature of the oil over high permeability Presentation/lecture has been produced with the financial assistance of the European Union. The content of the presentation/lectureis the sole responsibility of University of Novi Sad, Faculty of Technology and can under no circumstances be regarded as reflecting the position of the European Union and/or the Managing Authority.

  49. THANK YOU FOR YOUR ATTENTION . 1st Students Meeting Waterfriend .

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