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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Ilmiah Arena Tekstil IJEMS (Indonesian Journal of Environmental Management and Sustainability)
Qomarudin Helmy, Qomarudin
Program Studi Teknik Lingkungan Institut Teknologi Bandung
Agriculture, Biological Sciences & Forestry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Environmental Science Industrial & Manufacturing Engineering Public Health

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SINTESIS NANOPARTIKEL PERAK DAN UJI AKTIVITASNYA TERHADAP BAKTERI E. coli DAN S. aureus Wahyudi, Tatang; Sugiyana, Doni; Helmy, Qomarudin
Arena Tekstil Vol 26, No 1 (2011)
Publisher : Arena Tekstil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (813.881 KB)

Abstract

Pada penelitian ini dipelajari sintesis nanopartikel perak dan uji aktivitasnya sebagai anti-mikroba terhadapEscherichia coli dan Staphylococcus aureus. Nanopartikel perak disintesis melalui pembentukan larutan koloidperak dengan metode reduksi perak nitrat dengan zat pereduksi natrium borohidrida. Performa hasil sintesis larutankoloid nanopartikel perak dalam menghambat pertumbuhan mikroba dievaluasi melalui uji aktivitas terhadapEscherichia coli dan Staphylococcus aureus. Pada perbandingan molar NaBH4/AgNO3 = 1,2 dan perbandinganberat Ag/asam poli akrilat (PAA) = 10,7, diperoleh diameter rata-rata nanopartikel perak sebesar 71,8 nm dengannilai polydispersity index (PI) sebesar 0,293. Hasil sintesis larutan koloid nanopartikel memperlihatkan kemampuandalam menghambat pertumbuhan bakteri, dan daya hambat terhadap Staphylococcus aureus ditemukan 30% lebihkuat dibanding terhadap bakteri Escherichia coli. Hasil uji aktivitas antimikroba secara kuantitatif menunjukkanbahwa persentase reduksi bakteri dapat mencapai hingga lebih dari 99%.
Kinerja Microbial Fuel Cell dengan Variasi Hambatan Eksternal dalam Menghasilkan Energi Listrik dan Menyisihkan Senyawa Organik pada Limbah Cair Hidayat, Syarif; Aghnia, Dini Widyani; Kardena, Edwan; Helmy, Qomarudin
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 17, No 3 (2020): November 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (800.985 KB) | DOI: 10.14710/presipitasi.v17i3.223-232

Abstract

wastewater into direct electrical energy. In this study, the applied external resistance in the MFC reactor was optimized to determine its optimum conditions in generating electrical energy and removing organic compounds in wastewater. The MFC reactor's performance was evaluated by cell potential, power density, Coulombic efficiency (CE), and organic removal efficiency. The purpose of measuring these parameters is to determine the MFC reactor's performance in producing electrical energy and removing organic compounds for each experiment variation. Biochemical tests were carried out to choose the type of microorganisms in the anode electrode. This measurement is essential for the optimization of environmental conditions for subsequent experiments. MFC reactor with 100 Ω was selected as an optimum condition since it produced the highest power density and efficiency organic removal. In this condition, the CE value was 57%, slightly lower than the MFC reactor with an external resistance of 50 Ω, 65%. Based on biochemical tests, microorganisms that grow on the anode electrode were closed to the Clostridium (Clostridium sp1 and Clostridium sp2), a type of bacteria that belongs to the class of the exoelectrogen. The results showed that the applied external resistance influenced the performance of the MFC reactor. Thus the selection of the proper external resistance is an essential factor in the MFC reactor's operation.
Textile Dye Reactive Black 5 (RB5) Bio-Sorption with Moving Bed Biofilm Reactor and Activated Sludge Suryawan, I Wayan Koko; Helmy, Qomarudin; Notodarmojo, Suprihanto; Pratiwi, Riska; Septiariva, Iva Yenis
Indonesian Journal of Environmental Management and Sustainability Vol. 5 No. 2 (2021): June
Publisher : Research Centre of Inorganic Materials and Complexs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2021.5.2.67-71

Abstract

Reactive Black 5 (RB5) is one of the dyes used in textile industries in Indonesia. However, the high color content can interfere with the condition of water bodies if not treated. This waste treatment process is usually treated with biological treatment processes. Biological processing often used is the MBBR unit and activated sludge. This study aims to determine the RB5 dye’s bio-sorption efficiency using MBBR processing and activated sludge. MBBR processing and activated sludge consist of seeding, acclimatization, and running stages. This research was carried out using a real textile wastewater approach by adding 100 mg/L RB5 and adding 1000 mg/L starch solution. The processing results of the seeding stage indicate increasing in biomass. The acclimatization stage with 50% and 75% of wastewater indicates increased biomass and color removal. The RB5 color removal efficiency results in the MBBR unit and activated sludge show 41% and 84% values. The MBBR processing shows fluctuations each time where the desorption process occurs in the color removal. For this reason, the ozone pre-treatment process is conducted in the MBBR unit. The integrated pre-treatment with MBBR results show the same fluctuation as the previous processing with a color removal efficiency of 43% with a color removal efficiency of 43%.
Co-Authors Aghnia, Dini Widyani Doni Sugiyana, Doni EDWAN KARDENA Riska Pratiwi Septiariva, Iva Yenis Suprihanto Notodarmojo Suryawan, I Wayan Koko Syarif Hidayat Tatang Wahyudi, Tatang