MODELING AND OPTIMIZATION OF NUTRIENT REMOVAL IN MODIFIED SEPTIC TANK FOR DOMESTIC WASTEWATER TREATMENT IN OFFICE BUILDING
Domestic wastewater from office buildings has different characteristics compared to household domestic wastewater, especially the nutrient concentration. Domestic wastewater from office buildings contains 176 - 238 mg/L COD, 73.06 - 106.51 mg/L TN, and 3.66 - 7.70 mg/L TP, with an average C:N:P r...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/66458 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Domestic wastewater from office buildings has different characteristics compared
to household domestic wastewater, especially the nutrient concentration. Domestic
wastewater from office buildings contains 176 - 238 mg/L COD, 73.06 - 106.51
mg/L TN, and 3.66 - 7.70 mg/L TP, with an average C:N:P ratio of 100:42:2,56
(Vandith, 2019). Based on SNI 2398-2017, a conventional septic tank requires
several stages of further processing to achieve the quality standard of domestic
wastewater as stipulated in the Permen LHK No 68/2016. Moving Bed Biofilm
Reactor (MBBR) is a technology that can be used to improve the performance of
septic tank. The modified septic tank that is used in this study consist of anoxic 1,
anoxic 2, MBBR, and sedimentation reactors. The data used for modeling and
optimization process came from two previous studies which used MBBR with
kaldness media and sponge media. The conditions used for data collection are
hydraulic retention time 36 hours, nitrogen loading rate 0.06 kg N/m3.day, and
phosphorus loading rate 0.002 kg P/m3.day. The independent variables studied
were the recirculation ratio (RR) with values of 2, 3, 4 for kaldness media and 3/2,
3, 5 for sponge media, and intermittent aeration (IA) with values of 0, 1, 2 for both
media. Design-Expert version 13 program with Response Surface Methodology
(RSM) was used for modeling and optimization. The quadratic model was chosen
for NH3, TN, TP removal on kaldness media and NH3 and TN on sponge media.
Linear model is chosen for TP removal on sponge media. The optimum conditions
for kaldness media were at RR 3.67x and IA 2 with removal of NH3, TN, and TP of
69.82%, 67.98%, and 62.53%, respectively. The optimum conditions for sponge
media were at RR 1.5x and IA 1 with removal of NH3, TN, and TP of 23.94%,
19,04%, and 27,59%, respectively. |
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