"
ABSTRAK Kombinasi saringan pasir dan karbon aktif pada MMF umum digunakan sebagai
pretreatment UF karena efektif menghilangkan padatan tersuspensi sebesar 75-
90% dan zat organik hingga 59%. Namun di RS X, UF mengalami fouling dalam
waktu singkat disebabkan tingginya konsentrasi konstituen residu di influen yang
berasal dari MMF sehingga UF membutuhkan frekuensi backwash lebih tinggi.
Kondisi ini dapat mengurangi recovery dan daur ulang air limbah menjadi tidak
layak secara ekonomi. Oleh karena itu, diperlukan evaluasi kemampuan MMF
eksisting dan dampaknya terhadap kemampuan UF tipe S-640 polysulfone hollow
fiber. Evaluasi dilakukan dengan mengukur dan menguji kinerja MMF sebagai
pretreatement UF melalui serangkaian percobaan pilot plant pada berbagai variasi
kualitas input terhadap periode operasi MMF. Hasil penelitian menunjukan MMF
eksisting memiliki kapasitas pengolahan maksimal 616 m3 yang dicapai selama 3
hari operasi untuk satu siklus backwash. Pada periode operasi tersebut, MMF
memiliki efisiensi penyisihan (1) tinggi untuk kekeruhan dan TSS rata-rata
sebesar 62% dan 74% dan (2) rendah untuk zat organik yang hanya sebesar 14%.
Penyisihan zat organik yang rendah disebabkan karbon aktif sudah mengalami
penurunan daya adsorpsi sehingga diperlukan penggantian. Dengan kondisi efluen
MMF eksisting, UF S-640 Hollow Fiber hanya memiliki efisiensi penyisihan ratarata
zat organik 50% (maks. 64%, min. 30%), kekeruhan 73% (maks. 92%, min.
64%), dan TSS 78% (maks. 94%, min. 71%). Recovery rata-rata diperoleh sebesar
52,87% (maks. 89,69% ; min.33,33% ) pada range tekanan antar membran 3,5 –
2,8 bar. Sebagai pretreatment UF, MMF eksisting membutuhkan backwash satu
kali sehari dengan volume 0,9 m3 dan penggantian media pada MMF yang
dilakukan minimal satu kali dalam 6 bulan.
ABSTRACTThe combination of sand and activated carbon filter in MMF commonly used as
pretreatment for UF cause can remove fouling contituens effectively such as
solids until 75-90% and organic matter until 59%. However in the X Hospital, UF
was going to fouling in a short time due to the high concentration of constituents
in the influent residue derived from MMF so that UF require higher backwash
frequency. This condition can reduce the recovery and wastewater recycling to be
economically unfeasible. Therefore, we need to evaluate the capabilities of
existing MMF and its impact on the performance of UF S-640 polysulfone hollow
fiber. Evaluation was conducted by measuring and testing the performance of
MMF as a pretreatment of UF pilot plant through a series of experiments on a
wide variety of quality inputs to the MMFoperation period. The results showed
that existing MMF has a maximum processing capacity of 616 m3 that was
achieved during the three days of operation for a backwash cycle. In the period of
the operation, the MMF has (1) a high average removal efficiency for turbidity
(62%) and TSS (74%) and (2) low average removal efficiency for organic matter
(14%). The removal effiency of organic matter is low due to activated carbon
adsorption decreased and need to be replaced. At the existing effluent conditions
of MMF, UF Hollow Fiber S-640 has only 50% average removal efficiency of
organic matter (max. 64%, min 30%), turbidity 73% (max. 92%, min 64%), and
TSS 78% (max. 94%, min. 71%) . The average recovery was obtained for 52.87%
(max. 89.69%; min.33, 33%) in the transmembrane pressure range from 3.5 to 2.8
bar. As a UF pretreatment, the existing MMF requires backwash at least once in
two days with a volume of 0.9 m3 and the media needs to be replaced at least once
in 6 months."
