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All Journal Journal of Engineering and Technological Sciences Jurnal Teknik Sipil
Hernawan Mahfudz
Kelompok Keahlian Teknik Sumber Daya Air, Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung, Jl. Ganesha No. 10 Bandung 40132.
Civil Engineering, Building, Construction & Architecture Engineering

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Fabrication of Microporous Water Filter Using Titanium Dioxide Particles, Silica Particles, and Polyethylene Glycol Priatama, Aris; Abdullah, Mikrajuddin; Khairurrijal, Khairurrijal; Mahfudz, Hernawan
Journal of Engineering and Technological Sciences Vol 42, No 1 (2010)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (561.473 KB) | DOI: 10.5614/itbj.eng.sci.2010.42.1.3

Abstract

We report the fabrication of microporous filter for use in filtering both inorganic  and  organic  substances  from  liquid  materials.  Titania  (TiO 2)  anatase was  used  as  the  main  material  for  this  filter.  Polyethylene  glycol  (PEG)  with average  molecular  weight  of  20,000  was  also  used  as  additive  to  control  the formation  of  pores,  especially  pore  sizes.  The  mixture  of  titania  and  PEG  was pressed into cylindrical tablet shape at room temperature  and then simply heated inside a furnace up to temperature where the PEG decomposed into gas to leave only connected titania particles. The use of titania as base material for the filter allows  the  organic  substances  that  trapped  inside  the  filter  pores  to  be  easily removed by heating up the used filter at above decomposition temperature of the trapped  organics.  We  also  made  other  filter  by  adding  small  amount  of  silica (SiO2)  particles  to  reduce  the  size  of  the  pores  as  well  as  to  improve  the mechanical  strength.  We  observed  that  filters  containing  silica  particles,  with smaller  in  size  compared  to  titania,  resulted  in  better  mechanical  strength, smaller in pore sizes and better filtering results in term of turbidity and dissolved oxygen (DO) content. This  method is potential for development of larger scale and cheaper water filters for use in various applications.
Analisa Hidrolika Penggunaan Pintu Air pada Proyek Reklamasi Pantai Utara DKI Jakarta dengan Perangkat Lunak SMS 8.1 Mahfudz, Hernawan; Harlan, Dhemi; Sistarani, Meutia; Firdaus, Ahmad Mukhlis
Jurnal Teknik Sipil Vol 16, No 3 (2009)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (868.675 KB)

Abstract

Abstrak. Bertambahnya penduduk di wilayah DKI Jakarta tidak sebanding dengan bertambahnya lahan potensial yang masih dapat digunakan. Salah satu cara untuk memperoleh lahan adalah dengan reklamasi pantai di wilayah utara Jakarta. Perangkat lunak Surface-Water Modeling System (SMS) dapat digunakan untuk menganalisa pengaruh hidrolik yang terjadi sebelum dan setelah adanya reklamasi. Pemodelan menggunakan SMS versi 8.1 ini akan meliputi tiga buah skenario; kondisi eksisting, kondisi reklamasi dengan pintu air terbuka, dan kondisi reklamasi dengan pintu air tertutup. Input yang digunakan pada pemodelan adalah data debit rata-rata di hulu sungai dan data pasang surut. Output pemodelan adalah berupa vektor kecepatan dan arah aliran air serta gambaran elevasi muka air. Hasil dari pemodelan ini disimpulkan bahwa pengaruh pasang surut akan semakin membesar pada bagian muara sungai ketika reklamasi terlaksana dan pintu dalam kondisi terbuka, Tanggul eksisting yang telah berada pada sungai tidak akan berfungsi apabila dilakukan penambahan pintu air, baik dalam kondisi terbuka maupun tertutup, dan dalam kondisi pintu air tertutup, elevasi muka air sungai akan meningkat di bagian hulu.Abstract. The rapidly increasing amount of citizens in DKI Jakarta is unbalanced with the amount of potential usable land. The method to acquire this by doing coast reclamation especially in North Jakarta. The Surface-Water Modeling System (SMS) software can analyze the hydraulic effect that happened before and after the reclamation. Using SMS version 8.1, this paper mainly describes three scenarios influencing the reclamation site, which are the existing scenario before reclamation and the scenario after reclamation with opened and closed flood gate. The inputs needed are the average flow rate in the head of the river and the tidal movements’ data. The coming outputs will be the velocity vector, water direction, and an image of the water elevation. The analysis process concludes that after the reclamation has been accomplished, the influence of the tidal movements becomes bigger at the river mouth when the flood gate is opened, and the water elevation increases  at the upper stream when the flood gate was closed. It also concludes that the existing dam in the river will suffer failure if there were more flood gates whether it is opened or closed.
Co-Authors Ahmad Mukhlis Firdaus, Ahmad Mukhlis Aris Priatama Dhemi Harlan, Dhemi Khairurrijal Khairurrijal Meutia Sistarani Mikrajuddin Abdullah