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Lukitawesa, LukitawesaORCID iD iconorcid.org/0000-0002-7387-2358
Publications (4 of 4) Show all publications
Millati, R., Lukitawesa, L., Permanasari, E. D., Sari, K. W., Cahyanto, M. N., Niklasson, C. & Taherzadeh, M. J. (2018). Anaerobic digestion of citrus waste using two-stage membrane bioreactor. In: IOP Conference Series: Materials Science and Engineering: . Paper presented at Quality in Research: International Symposium on Materials, Metallurgy, and Chemical Engineering, Bali, July 24–27, 2017.. , 316, Article ID 012063.
Open this publication in new window or tab >>Anaerobic digestion of citrus waste using two-stage membrane bioreactor
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2018 (English)In: IOP Conference Series: Materials Science and Engineering, 2018, Vol. 316, article id 012063Conference paper, Published paper (Refereed)
Abstract [en]

Anaerobic digestion is a promising method to treat citrus waste. However, the presence of limonene in citrus waste inhibits anaerobic digestion process. Limonene is an antimicrobial compound and could inhibit methane forming bacteria that takes a longer time to recover than the injured acid forming bacteria. Hence, volatile fatty acids will be accumulated and methane production will be decreased. One way to solve this problem is by conducting anaerobic digestion process into two stages. The first step is aimed for hydrolysis, acidogenesis, and acetogenesis reactions and the second stage is aimed for methanogenesis reaction. The separation of the system would further allow each stage in their optimum conditions making the process more stable. In this research, anaerobic digestion was carried out in batch operations using 120 ml-glass bottle bioreactors in 2 stages. The first stage was performed in free-cells bioreactor, whereas the second stage was performed in both bioreactor of free cells and membrane bioreactor. In the first stage, the reactor was set into 'anaerobic' and 'semi-aerobic' conditions to examine the effect of oxygen on facultative anaerobic bacteria in acid production. In the second stage, the protection of membrane towards the cells against limonene was tested. For the first stage, the basal medium was prepared with 1.5 g VS of inoculum and 4.5 g VS of citrus waste. The digestion process was carried out at 55°C for four days. For the second stage, the membrane bioreactor was prepared with 3 g of cells that were encased and sealed in a 3×6 cm2polyvinylidene fluoride membrane. The medium contained 40 ml basal medium and 10 ml liquid from the first stage. The bioreactors were incubated at 55°C for 2 days under anaerobic condition. The results from the first stage showed that the maximum total sugar under 'anaerobic' and 'semi-aerobic' conditions was 294.3 g/l and 244.7 g/l, respectively. The corresponding values for total volatile fatty acids were 3.8 g/l and 2.9 g/l, respectively. Methane production of citrus waste taken from the first stage under 'anaerobic' condition in membrane and free-cells bioreactors was 11.2 Nml and 7.2 Nml, respectively. Whereas, methane production of citrus waste taken from the first stage under 'semi-aerobic' condition in membrane and free-cells bioreactors was 8.8 Nml and 5.7 Nml, respectively. It can be seen from the results of the first stage that volatile fatty acids from 'anaerobic' condition was higher than that of 'semi-aerobic' condition. The absence of oxygen provides the optimal condition for growth and metabolism of facultative and obligatorily anaerobic bacteria in the first stage. Furthermore, polyvinylidene fluoride membrane was able to protect the cells from antimicrobial compounds.

National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-14027 (URN)10.1088/1757-899X/316/1/012063 (DOI)2-s2.0-85045624058 (Scopus ID)
Conference
Quality in Research: International Symposium on Materials, Metallurgy, and Chemical Engineering, Bali, July 24–27, 2017.
Available from: 2018-05-03 Created: 2018-05-03 Last updated: 2018-05-03Bibliographically approved
Lukitawesa, L., Wikandari, R., Millati, R., Taherzadeh, M. J. & Niklasson, C. (2018). Effect of effluent recirculation on biogas production using two-stage anaerobic digestion of citrus waste. Molecules, 23(12), Article ID 3380.
Open this publication in new window or tab >>Effect of effluent recirculation on biogas production using two-stage anaerobic digestion of citrus waste
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2018 (English)In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 23, no 12, article id 3380Article in journal (Refereed) Published
Abstract [en]

Citrus waste is a promising potential feedstock for anaerobic digestion, yet the presence of inhibitors such as d-limonene is known to limit the process. Effluent recirculation has been proven to increase methane yield in a semi-continuous process for recalcitrant material, but it has never been applied to toxic materials. This study was aimed to investigate the effect of recirculation on biogas production from citrus waste as toxic feedstock in two-stage anaerobic digestion. The first digestion was carried out in a stirred tank reactor (STR). The effluent from the first-stage was filtered using a rotary drum filter to separate the solid and the liquid phase. The solid phase, rich in hydrophobic D-limonene, was discarded, and the liquid phase containing less D-limonene was fed into the second digester in an up-flow anaerobic sludge bed (UASB) reactor. A high organic loading rate (OLR 5 g VS/(L·day)) of citrus waste was fed into the first-stage reactor every day. The effluent of the first-stage was then fed into the second-stage reactor. This experiment was run for 120 days. A reactor configuration without recirculation was used as control. The result shows that the reactor with effluent recirculation produced a higher methane yield (160–203 NmL/g·VS) compared to that without recirculation (66–113 NmL/g·VS). More stable performance was also observed in the reactor with recirculation as shown by the pH of 5–6, while without recirculation the pH dropped to the range of 3.7–4.7. The VS reduction for the reactor with recirculation was 33–35% higher than that of the control without recirculation. Recirculation might affect the hydrolysis-acidogenesis process by regulating pH in the first-stage and removing most of the D-limonene content from the substrate through filtration. 

Place, publisher, year, edition, pages
MDPI AG, 2018
Keywords
biogas, anaerobic digestion, citrus waste, recirculation, STR, UASB
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:hb:diva-15616 (URN)10.3390/molecules23123380 (DOI)2-s2.0-85058915092 (Scopus ID)
Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-08-07
Kurniawan, T., Lukitawesa, L., Hanifah, I., Wikandari, R., Millati, R., Taherzadeh, M. J. & Niklasson, C. (2018). Semi-continuous reverse membrane bioreactor in two-stage anaerobic digestion of citruswaste. Materials, 11(8), Article ID 1341.
Open this publication in new window or tab >>Semi-continuous reverse membrane bioreactor in two-stage anaerobic digestion of citruswaste
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2018 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 11, no 8, article id 1341Article in journal (Refereed) Published
Abstract [en]

Abstract

The presence of an antimicrobial compound called D-Limonene in citrus waste inhibits methane production from such waste in anaerobic digestion. In this work, a two-stage anaerobic digestion method is developed using reverse membrane bioreactors (rMBRs) containing cells encased in hydrophilic membranes. The purpose of encasement is to retain a high cell concentration inside the bioreactor. The effectiveness of rMBRs in reducing cell washout is evaluated. Three different system configurations, comprising rMBRs, freely suspended cells (FCs), and a combination of both (abbreviated to rMBR–FCs), are incubated at three different organic loading rates (OLRs) each, namely 0.6, 1.2, and 3.6 g COD/(L cycle). Incubation lasts for eight feeding cycles at 55 °C. Methane yield and biogas composition results show that rMBRs perform better than rMBR–FCs and FCs at all three OLRs. Volatile fatty acid profiles and H2 production show that the reactors are working properly and no upset occurs. Additionally, a short digestion time of 4 days can be achieved using the rMBR configuration in this study.

Place, publisher, year, edition, pages
MDPI AG, 2018
Keywords
anaerobic digestion, biogas, membrane bioreactor, semi-continuous, citrus waste, two-stage
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-15627 (URN)10.3390/ma11081341 (DOI)000444112800078 ()2-s2.0-85051138755 (Scopus ID)
Available from: 2019-01-07 Created: 2019-01-07 Last updated: 2019-08-07
Lukitawesa, L., Safarudin, A., Millati, R., Taherzadeh, M. J. & Niklasson, C. (2017). Inhibition of patchouli oil for anaerobic digestion and enhancement in methane production using reverse membrane bioreactors.. Renewable energy
Open this publication in new window or tab >>Inhibition of patchouli oil for anaerobic digestion and enhancement in methane production using reverse membrane bioreactors.
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2017 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682Article in journal (Refereed) Published
Abstract [en]

Patchouli oil is an essential oil extd. from arom. crop Pogostemon cablin and is widely used in perfumery industry, food industry, and/or even as medicine. The leaves have 4.6% oil that is extd. by steam, but remains an enormous amt. of wastes contg. ca 0.8% oil. Patchouli waste is an interesting substrate for methane prodn. However, the oil has been found to have antibacterial activity. The inhibition of patchouli oil on anaerobic digestion was investigated in this study under thermophilic conditions (55 °C). The patchouli oil showed antibacterial effect, where addn. of 0.05, 0.5 and 5 g/L patchouli oil reduced biogas prodn. by 16.2%, 27.2% and 100% resp. As patchouli oil is a lipophilic compd., hydrophilic polyvinylidene difluoride (PVDF) membrane was used to protect the microorganisms against this inhibitor in a reverse membrane bioreactor (rMBR) system. The methane yield of fresh plant and waste were 86 and 179 NmL CH4/gVS, resp. when using free cells. Although using solely an rMBR did not give significant rise to methane yield, the combination rMBR and free cell strategy to protect part of the digesting microorganisms against this inhibitor considerably enhanced the methane prodn. by 73% for fresh patchouli plant, compared to digestion using free cells. [on SciFinder(R)]

Place, publisher, year, edition, pages
Elsevier Ltd., 2017
Keywords
Anaerobic digestion, Inhibition, Membrane bioreactor, Methane, Patchouli biomass, Patchouli oil
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:hb:diva-12534 (URN)10.1016/j.renene.2017.04.068 (DOI)000440771200008 ()2-s2.0-85018389534 (Scopus ID)
Note

Copyright (C) 2017 American Chemical Society (ACS). All Rights Reserved.; CAPLUS AN 2017:767515(Journal)

Available from: 2017-08-27 Created: 2017-08-27 Last updated: 2018-11-30Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-7387-2358

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