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Satuan Operasi
Responsi Prasedimentasi
Program Studi Teknik
LingkunganFakultas Teknik
Universitas Dipponegoro
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Contoh Soal 1
• Gambarkan kurva hubungan antarakeepatan mengendap partikeldiskrit terhadap temperatur air padaaliran laminer !re " 1# Dimana dp $%&' mm( dan Ss $ '&)*#
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+a,aban
• Untuk aliran laminer !re " 1& maka koe-sien drag CD $
'./!re( sehingga0Gabungan perhitungan gaa gravitasi dengan gaa drag2riksi untuk partikel spherial& menghasilkan 2ormula sbb0vp $ 33.g/4CD5#336p 7 6,5/6,5#dp51/'
atauvp $ 33.g/4CD5#3sgp815#dp51/'
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Contoh Soal '
• Gambarkan kurva hubungan antarakeepatan pengendapan partikelterhadap diameter partikel diskrit pada
kondisi !re " 1& pada temperatur '9 oC&Ss $ '&)*#
Pada temperatur '9 oC& : $ %&94;.#1%8' m'/detik& sehingga dapat ditulis men<adi0
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+a,aban
• =s $ 1&>'%*>.#1%)#dp'
Tabel diisi dan dibuat gra-k hubungan antarakeepatan pengendapan dan diameter partikel
diskrit# ?uat pembahasan dan kesimpulanna#
Dp (mm)
=s3m/detik5
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Contoh Soal 4
• @itunglah e-siensi pengendapanpartikel diskrit pada bak pengendapang mempunai dp $ %&' mm& Ss $
'&)* dalam kondisi T $ ') oC& !re $1#*%%#
Debit bak pengendap A $ '%%
L/detik dan luas permukaan bak Bs $4#%%% m'#
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+a,aban
• eepatan mengendap partikel0
!re $ 1#*%% CD $ %&.
T $ ') oC 6 $ %&;;)91 gram/m4
vp' $3.g/4CD5#3sgp815#dp (newton)=p $ %&%11> m/detik
• =o $ A/B
A/B $ )&)>#1%8* m/detik
$ %&%%)> m/detik
=s =o( maka partikel mengendap 1%% E untukukuran dp $ %&' mm
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+a,aban
• Dengan kurva per2ormane& maka0
ada 4 ara0
1# enggunakan kurva per2ormane dan tentukan
nilai n8na# Gunakan n good per2ormane atauver good per2ormane#
'# enggunakan rumus0
/o $ 1 7 31 H 3n#o/3A/B5581/n
dengan menentukan nilai n8na berdasarkan kurvaper2ormane#
4#enggunakan gra-k hubungan keepatanpengendapan dengan 2raksi tersisa#
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urva Per2ormane
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Contoh Soal .
• Suatu bak pengendap horiIontaldengan debit A $ *%% L/detikmenghasilkan removal ratio seperti
pada gambar# Tentukan0
1#Luas permukaan untuk memisahkan
suspensi *% E'#Gambarkan kurva hubungan removal
ratio dengan luas area#
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Gambar =s vs E Removal
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+a,aban
• r $ *% E& diperoleh =s $ So $ 1 mm/detik
So $ @/To $ @#A/= $ @#A/@#B $ A/B
So $ A/B
1 mm/detik $ *%%#1%84 / BB $ *%% m'
r (%) So (mm/detik) A (m2)
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+a,aban
• Tabel diisi dan dibuat gra-khubungan antara e-siensi removaldengan luas bak# ?uat pembahasan
dan kesimpulanna#
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etodologi
• Sediakan pipa paralon P=C dengandiameter '% m atau 1% m#
• Pan<ang paralon $ '&* m
• +arak titik sampling $ *% m
• +umlah titik sampling $ . titik
• Lama sampling $ 4 <am
• Jnterval sampling setiap <am• Bir ang akan diu<i harus dalam keadaan
terampur homogen
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Bnalisis
• ?uat tabel
LamaSampling
(jam)
KedalamanSampling
(m)
KecepatanPengendapa
n(mm/detik)
FraksiTersisa (%)
1 1 Gunakananalisis
kekeruhan
'
4
.
' 1
'
4
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Bnalisis
• ?uat gra-k
=s 3mm/detik5
Fraksi Tersisa3E5
dK1
dK'
Tentukan =sasumsi
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Bnalisis
• ?uat tabel
• t $ 31 7 o5 H B/=s asumsi
FraksiTersisa (%)
Fraksi di !i(mm/detik)
A " di#!i
** %&%* M M
%&1
%&1%&1
%&1
%&1
Total M
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Bnalisis
• =s asumsi $ ### M• Tentukan diameterna menggunakan hukum
Stoke dulu
•
Cek nilai =o $ =h menggunakan kurvaper2ormane pada kondisi good per2ormane&n $1/4# Dimana telah diketahui nilai t dulu#
=s/3A/B5 $ =s/=o $ M
=o $ =s 0 M• +ika =s =o& maka O N 3partikel dengan
diameter ### mm dapat mengendap 1%% E5
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Bnalisis
• Cek nilai0
=s 3stoke atau ne,ton5
!re
CD
!2r
=h $ =odan lakukan koreksi#
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