FLOTASI
Pengertian DAF Proses pengolahan air limbah atau air lainnnya dengan cara memisahkan endapan seperti minyak atau solid Pemisahan tercapai oleh udara yang terlarut di dalam air di bawah tekanan, lalu udara dilepaskan pada tekanan atmosferik didalam tangki pengapungan
Alasan Menghemat tempat Biaya operasi lebih murah Dapat menghemat investasi dana 25-30% Tidak begitu terpengaruh terhadap iklim Waktu yang diperlukan relatif singkat
Benefits of DAF
Benefits of DAF Small footprint Short star-tup time Minimal mechanical equipment No submerged moving parts Algae floats better than settles Sed. Basin: 75-1 gpm/ft /ft2 DAF: 4-6 gpm/ft /ft2
Rule of Thumb
How DAF Works
How DAF Works Air under pressure is dissolved into water according to Henry’s Law of Dissolution. Releasing the pressure back to standard temperature and pressure via a special device creates millions of “microbubbles” approximately 30 to 100 microns in diameter. At an 8 percent recycle flow at 70 psig saturation pressure, the number of 40-micron-diameter bubbles created at 40°F is 681 million per gallon. At 68°F the number of bubbles per gallon is 530 million
How DAF Works
SKEMATIK PROSES DAF
Faktor yang mempengaruhi DAF Sifat Partikel Ukuran Partikel Dispersing Agents Komposisi dan sifat Influent Arus Cairan Rasio A/S Float Removal
TUJUAN PEMISAHAN
Air to Solids Ratio
System DAF yang ada Full Flow Pressurization Partial flow Pressurization without effluent recycle Recycle Flow Pressurization
Operational Modes
Gas to Solid Ratio of Recycle Flow Pressurization Gin= QRCr + QCf Gout= Q(1+R) Ce Asumsi Cf = Ce Maka G = Gin – Gout G/S = Rce (FP-1)/X G/S = Rce (f)(P-1)/X
Jika Air to Solid ratio maka: A/S = 1/3 a R (FP-1)/X A/S = 1/3 a R (f)(P-1)/X R= Qr/ Q Maka : A/S = 1/3 a Qr / Q (FP-1)/X A/S = 1/3 a Qr / Q (f) (P-1)/X
SKEMATIK PROSES DAF
SKEMATIK PROSES DAF
SKEMATIK PROSES DAF
SKEMATIK PROSES DAF
SKEMATIK PROSES DAF
SKEMATIK PROSES DAF
SKEMATIK AIR-HANDLING DAF PUMP
Prinsip Kerja DAF
Contoh modern unit DAF
Buble Generating Nozzle
Terima Kasih