ABSTRAK Kombinasi saringan pasir dan karbon aktif pada MMF umum digunakan sebagaipretreatment UF karena efektif menghilangkan padatan tersuspensi sebesar 75-90% dan zat organik hingga 59%. Namun di RS X, UF mengalami fouling dalamwaktu singkat disebabkan tingginya konsentrasi konstituen residu di influen yangberasal dari MMF sehingga UF membutuhkan frekuensi backwash lebih tinggi.Kondisi ini dapat mengurangi recovery dan daur ulang air limbah menjadi tidaklayak secara ekonomi. Oleh karena itu, diperlukan evaluasi kemampuan MMFeksisting dan dampaknya terhadap kemampuan UF tipe S-640 polysulfone hollowfiber. Evaluasi dilakukan dengan mengukur dan menguji kinerja MMF sebagaipretreatement UF melalui serangkaian percobaan pilot plant pada berbagai variasikualitas input terhadap periode operasi MMF. Hasil penelitian menunjukan MMFeksisting memiliki kapasitas pengolahan maksimal 616 m3 yang dicapai selama 3hari operasi untuk satu siklus backwash. Pada periode operasi tersebut, MMFmemiliki efisiensi penyisihan (1) tinggi untuk kekeruhan dan TSS rata-ratasebesar 62% dan 74% dan (2) rendah untuk zat organik yang hanya sebesar 14%.Penyisihan zat organik yang rendah disebabkan karbon aktif sudah mengalamipenurunan daya adsorpsi sehingga diperlukan penggantian. Dengan kondisi efluenMMF eksisting, UF S-640 Hollow Fiber hanya memiliki efisiensi penyisihan rataratazat organik 50% (maks. 64%, min. 30%), kekeruhan 73% (maks. 92%, min.64%), dan TSS 78% (maks. 94%, min. 71%). Recovery rata-rata diperoleh sebesar52,87% (maks. 89,69% ; min.33,33% ) pada range tekanan antar membran 3,5 –2,8 bar. Sebagai pretreatment UF, MMF eksisting membutuhkan backwash satukali sehari dengan volume 0,9 m3 dan penggantian media pada MMF yangdilakukan minimal satu kali dalam 6 bulan. ABSTRACT The combination of sand and activated carbon filter in MMF commonly used aspretreatment for UF cause can remove fouling contituens effectively such assolids until 75-90% and organic matter until 59%. However in the X Hospital, UFwas going to fouling in a short time due to the high concentration of constituentsin the influent residue derived from MMF so that UF require higher backwashfrequency. This condition can reduce the recovery and wastewater recycling to beeconomically unfeasible. Therefore, we need to evaluate the capabilities ofexisting MMF and its impact on the performance of UF S-640 polysulfone hollowfiber. Evaluation was conducted by measuring and testing the performance ofMMF as a pretreatment of UF pilot plant through a series of experiments on awide variety of quality inputs to the MMFoperation period. The results showedthat existing MMF has a maximum processing capacity of 616 m3 that wasachieved during the three days of operation for a backwash cycle. In the period ofthe 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 carbonadsorption decreased and need to be replaced. At the existing effluent conditionsof MMF, UF Hollow Fiber S-640 has only 50% average removal efficiency oforganic matter (max. 64%, min 30%), turbidity 73% (max. 92%, min 64%), andTSS 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 2.8bar. As a UF pretreatment, the existing MMF requires backwash at least once intwo days with a volume of 0.9 m3 and the media needs to be replaced at least oncein 6 months. |