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MIXING

MIXING. Mixing dalam operasi TL. Equalisasi Netralisasi Koagulasi flokulasi Aerasi Disinfeksi. Alat dalam operasi mixing. Mekanikal (Rotating impeller propeler, turbin, paddle) Pneumatik (Air agitator, mixing jet/pump) Baffle basin. Tipe Impeller. Propeller. Turbine.

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MIXING

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  1. MIXING

  2. Mixing dalam operasi TL • Equalisasi • Netralisasi • Koagulasi flokulasi • Aerasi • Disinfeksi

  3. Alat dalam operasi mixing • Mekanikal (Rotating impellerpropeler, turbin, paddle) • Pneumatik (Air agitator, mixing jet/pump) • Baffle basin

  4. Tipe Impeller • Propeller

  5. Turbine

  6. Paddle/dayung

  7. oblique paddle agitator Straight padle agitator

  8. Paraboladisc turbin Arc disc turbin

  9. Agitator spread around Helical ribbon impelller

  10. Special blade agitator

  11. Posisi mixer • Top entering mixer • Bottom enter • Side enter

  12. Vortex • The motion of the fluid swirling rapidly around a center is called a vortex. • The speed and rate of rotation of the fluid are greatest at the center, and decrease progressively with distance from the center. • The fluid pressure in a vortex is lowest in the center (where the speed is greatest) and rises progressively with distance from the center. • Vorteks menghalangi operasi mixing dengan cara mengurangi kecepatan impeller relatif terhadap cairan

  13. Vortex dapat dikurangi dengan baffling yang tepat (1/10 – 1/12 dari diameter tangki)

  14. Contoh operasi mixing • Koagulasi flokulasi • Rapid mixing  koagulasi • Slow mixing  flokulasi

  15. G value (velocity gradient) • The degree of mixing is based on the power imparted to the water • GT (rapid mixing) (Slow mixing) Sumber: Reynolds, 1982

  16. Praktek/demo jar test • Rapid mixing  100 rpm selama 60 det • Slow mixing  60 rpm selama 5 min  40 rpm selama 10 min • Latihan: hitung G value

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