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Lieke Riadia
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Chemical Engineering, Chemistry & Bioengineering Environmental Science

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DECOLORIZATION KINETICS FROM COFFEE EFFLUENT WITH PHOTO-FENTON REACTION Lieke Riadia
Purifikasi Vol 12 No 3 (2011): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v12.i3.73

Abstract

Coffee effluent contains a high amount of dark brown pigments. When this waste is released in the river, itwill block the sun ray and disturb the photosynthesis process. The decolorization of coffee effluent usingphoto-Fenton and Fenton processes is presented in this paper. On the photo-Fenton reaction, UV light, ionFe(II) and H2O2 will produce •OH. This will react with organic contaminant, so the color of the effluent willbe changed from brown to yellow, and finally became a clear solution. On the Fenton process, reactionoccurred without the existence of UV light. The rate of this decolorization is slower than photo-Fentonreaction. The reaction consists of three phases, the first phase happen when H2O2 is added to the reactor andthe color changes rapidly, the color of the solution start to be removed fast (second phase) and then it becamefaster and there were no more changes in its color (third phase). The color removal rate for second phase atthe coffee effluent concentration of 250 ppm,300 ppm, 400 ppm were : r = -0,0322 (Abs)² ; r = -0,0271(Abs)²; r = -0,0196 (Abs)², whereas the color removal rate for third phase at the coffee effluent concentrationof 250 ppm, 300 ppm, 400 ppm were : r = -0,0049 (Abs) ; r = -0,0211 (Abs) ; r = -0,005 (Abs)
STABILISASI LOGAM BERAT DALAM SLUDGE DAN EFEKTIFITAS PENGGUNAANNYA PADA PEMBUATAN BATAKO Lieke Riadia
Purifikasi Vol 7 No 2 (2006): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v7.i2.255

Abstract

Sludge, which contains heavy metals, may pose hazard to the environment due to possibility of groundwater contamination from heavy metal leaching. Heavy metals in sludge can be stabilized using certain stabilizing agents. This study utilizes sludge from industrial wastewater treatment plant. Three stabilizing agents (CAO, brown sugar and sodium sulfide) are used in this study to stabilize heavy metals (Cu, Fe, Ni, and Zn) contained in sludge. The result of the study shows that brown sugar can be used to stabilize Fe up to 82%. CAO is the most effective stabilizing agent for Cu and Zn. CAO also shows the highest capacity to bind Ni compared to brown sugar and sodium sulfide. CAO can stabilize 95% Cu, 67% Ni, and 98% Zn. The concentration of stabilizing agent does not affect significantly to the effectiveness of stabilizing agents in binding heavy metals. The stabilized sludge can be used as raw material to produce brick as a mixture of cement and sand. The maximum sludge concentration that can be added as sand replacement is 10% w/w based on the result of compressive strength test.
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