Mochtar Hadiwododo, Mochtar
Environmental Engineering Department Diponegoro University

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PENGARUH WAKTU REAKSI DAN WAKTU TINGGAL STABILISASI PADA SEQUENCING BATCH REACTOR AEROB DENGAN PENAMBAHAN KARBON AKTIF TERHADAP PENURUNAN CHEMICAL OXYGEN DEMAND

JURNAL PRESIPITASI Vol 3, No 2 (2007): Vol 3, No 2 (2007)
Publisher : Department of Environmental Engineering

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Abstract

Sequencing  Batch  Reactor  (SBR)  process  represent  biological  wastewater  treatment  with aerobic process  used  occasionally  to  eliminate  dissolve  organic  materials  constructively microorganism especially  bacterium  in  course  of  organic  degradation.  Sequencing  Batch Reactor(SBR )has five phase in its cycle, namely fill, react, setlle, draw and iddle phase. In this study iddle phase was changed into stabilization phased where microorganism oxydize organic matter  as  stored  materials  in  cell  under certain  aeration  period  of  time.The  objectives  of  this research are to know influence of time react and time stabilisation with added of Granular Active Carbon  (GAC)    to  COD  removal.  In  research  was used  reactor  from  plastic  material  with diameter  25  cm  and  high  is  25  cm,  volume  of wastewater  in  reactor  is  5  liter  and  volume  of sludge is 35% from volume of wastewater that 1,75 liter. Waste that used was artificial waste glucose soluble with 1032.5 mg/l concentration of COD. As independent variable are react time: (0,5 ; 1; 1,5 ; 2 hours) and stabilitation time (3; 4; 5; 6 hours), if dependent  variable are removal of  carbon.  Application  of  Granular  Active  Carbon  (GAC)  as absorbent,  combined  with suspended  system  of  SBR,  is  expected  to  be  able  to  remove  COD better.  As  the  result  this research  shows  that the finest of  carbon removal   is occurred  in time react 1  hours, andtime stabilitation 6 hours  is 97.23%. COD removal with GAC better than that without GAC.

PENURUNAN KONSENTRASI LOGAM BERAT CU DAN AG PADA LIMBAH CAIR INDUSTRI PERAK RUMAH TANGGA DENGAN METODE ELEKTROKOAGULASI

JURNAL PRESIPITASI Vol 4, No 1 (2008): Vol 4, No 1 (2008)
Publisher : Department of Environmental Engineering

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Abstract

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POLA PENYEBARAN GAS NO 2 DI UDARA AMBIEN KAWASAN UTARA KOTA SEMARANG PADA MUSIM KEMARAU MENGGUNAKAN PROGRAM ISCST3

Jurnal Presipitasi Vol 1, No 1 (2006): Vol 1, No 1 (2006)
Publisher : Departemen Teknik Lingkungan

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Abstract

North  district  of  Semarang  City  is  an  area  characterized  by  dense  population, congested transportation, and high  industry activities.  Urban activities in this area are predicted produce enourmous pollutant  one  of  them is  NO 2 .    This  gas  is  hazardous  for  human  health, and can cause death even that concentration exceed standard level 150 µgr/m3.  Inventory emission is used to identify sources that produce NO 2  gas and quatify the concentration.  ISCST3 program was used as a tool to recapitulate the dispersion  of NO 2  gas in ambient from it sources to the potent receptor. Combinated with  Surfer program, it result were easily be visualized trough NOx isopleth  contour  overlaid  to  land used  map.  The  result  of  this  observation  showed  that  total emission  of  NO 2   gas  in  area observation  is  0,001445  ton/year  where  is  transportation contributes 91,68 %, followed by industry 8,31 %, and domestic 0,01 %.  Dispersion pattern of NO 2   gas  in  ambient  is  mainly  affected  by calm  condition  of  wind  making  NO 2   gas  is concentrated in 3 regions i.e Pindrikan Kidul, Peterongan, and Tambakrejo.