Transcript Flotasi 1

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
1. Sifat Partikel
2. Ukuran Partikel
3. Dispersing Agents
4. Komposisi dan sifat Influent
5. Arus Cairan
6. Rasio A/S
7. Float Removal
TUJUAN PEMISAHAN
Air to Solids Ratio
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