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The Effect of Nitrogen Gas Flushing on Intermediate Products Formation in Acidogenic Stage of Anaerobic Process of Cocoa Sweatings Syafila, Mindriany; Handajani, Marisa; Prayascitra, Adearty
Journal of Engineering and Technological Sciences Vol 42, No 2 (2010)
Publisher : ITB Journal Publisher, LPPM ITB

Cocoa is one of Indonesian-main plantation commodities. During the cocoa seed drying process, there are two types of waste that are cocoa pod and cocoa sweating. Since the organic compounds contained in cocoa sweating is high enough, it is possible to anaerobically treat this wastewater in order to recover either intermediate or end products. Preliminary study showed that the existence of H2 in the reactor would block acetic acid formation. Therefore, the aim of this current experiment was to decrease hydrogen partial pressure by flushing various nitrogen gas flow rate to shift the intermediate products during the cocoa sweating anaerobic treatment. The experiments were carried on a Circulating Bed Reactor (CBR) which contained organic compounds around 100,000 mg/l COD. Then, the reactor was flushed continuously with nitrogen gas as without flushing, 125 ml/min, 500 ml/min and 750 ml/min. The results show there was a possibility that the introduction of nitrogen gas into the reactor could shift the profile of the intermediate product formation. At lower nitrogen gas flow rate more ethanol was formed than acetate formation, although at higher nitrogen gas flow rate the formation of acetate was still low enough.Â

The Effect of Ozonation Process on Bromide-Containing Groundwaters in Bandung Area and Its Surroundings Syafila, Mindriany; Sukandar, Sukandar; Haryanto, Eric
Journal of Engineering and Technological Sciences Vol 44, No 3 (2012)
Publisher : ITB Journal Publisher, LPPM ITB

Disinfection process was applied as the last step of the water treatment to kill pathogenic bacteria inÂ theÂ water. However,Â according toÂ several studies, theÂ ozonationÂ disinfectionÂ process could form undesired by-products.Â One of the by-productsÂ potentiallyÂ affecting human life is bromateÂ produced from bromide ionic-containingÂ water. This study was carried out to examine the effect of raw waterÂ characteristicsÂ andÂ pHÂ onÂ bromateÂ formation.Â Also,Â theÂ performanceÂ of bromate formation for a period of exposure time was analyzed. Raw waters taken from four different areas around Bandung were exposed to ozone introduced to a reactor with a flow rate of 2 L/min. The pH of the raw waters varied from 4, 7 to 10.Â TheÂ resultsÂ showÂ thatÂ thereÂ wasÂ noÂ evidenceÂ ofÂ anÂ initialÂ bromideÂ ion concentration,Â whereasÂ aÂ changeÂ inÂ pHÂ valueÂ givesÂ aÂ significantlyÂ different outcome. InÂ acidic conditionÂ (pH of 4) theÂ bromateÂ formation tends to decrease, whereasÂ whenÂ theÂ pHÂ valueÂ increasesÂ toÂ aÂ pHÂ ofÂ 10,Â theÂ bromateÂ formation increases.Â Therefore, for drinking waterÂ with aÂ neutral pH,Â when bromide ions areÂ detectedÂ inÂ theÂ rawÂ water,Â theÂ drinkingÂ waterÂ mayÂ beÂ toxicÂ dueÂ toÂ the presence of bromate.

POTENSI PEMBENTUKAN PRODUK HASIL DEGRADASI SENYAWA ORGANIK LIMBAH CAIR TAHU MENGGUNAKAN ANAEROBIC BAFFLED REACTOR LIMA KOMPARTEMEN Myrasandri, Puteri; Syafila, Mindriany
Jurnal Teknik Lingkungan Vol 18, No 1 (2012)
Publisher : ITB Journal Publisher, LPPM ITB

Abstrak: Industri tahu di Indonesia kebanyakan merupakan industri skala kecil yang berkembang dengan pesat. Penggunaan air yang signifikan pada proses pembuatan menghasilkan limbah cair yang jumlahnya besar pula. Teknologi pengolahan secara biologi dengan memanfaatkan bakteri merupakan alternatif yang potensial untuk dikembangkan karena teknologinya sederhana, dan hemat energi. Salah satu contohnya adalah Anaerobic Baffled Reactor yang merupakan modifikasi dari tangki septik konvensional dengan adanya penambahan sekat-sekat pada tangki septik. Penelitian ini bertujuan untuk mengetahui proses pengolahan limbah cair industri Tahu di Bandung Utara dengan menggunakan Anaerobic Baffled Reactor skala laboratiorium dengan lima kompartemen. Pada percobaan ini akan dipelajari degradasi senyawa organik terlarut pada tiap kompartemen. Beban Chemical Oxygen Demand terlarut influen adalah sebesar 8.000 mg/L dan reaktor dioperasikan pada HRT 96 jam dan 72 jam. Kondisi steady-state diindikasikan dengan nilai Chemical Oxygen Demand terlarut yang stabil, dengan produksi Total Asam Volatil dan etanol paling besar terjadi pada waktu operasi jam ke-48. Penyisihan organik tertinggi dihasilkan oleh HRT 96 jam sebesar 53,34%. Biogas berupa gas metan yang terbentuk sebesar 14,0-14,6% (v/v) pada HRT 96 jam dan 29,1-29,6% (v/v) menunjukkan proses asidogenesis yang lebih dominan daripada metanogenesis.Kata kunci: Anaerobic Baffled Reactor, biogas, limbah cair tahu, Chemical Oxygen Demand terlarut, Total Asam Volatil. Abstract: Tofu industry is one of the fast-growing industries among the small-scale industries in Indonesia. In the process of tofu production, the significant usage of water results in tremendous amount of wastewater. Treatment of tofu wastewater has become an obstacle because of the high capital cost and limited resources. Biological treatment using microorganism, more specifically bacteria, is a potential alternative to be developed because the technology is relatively simple and has a low energy usage. An example of this kind of treatment is Anaerobic Baffled Reactor, which is a modification of conventional septic tank with the addition of baffles. In this experiment, a laboratory- scale Anaerobic Baffled Reactor with five compartments was used. The degradation of organic matter in each compartment was studied. Tofu wastewater used in this experiment was from a tofu industry in North Bandung Area with soluble COD 8.000 mg/L. Reactor was operated at HRT of 96 and 72 hours. Steady-state condition achieved was indicated by the stabilized soluble Chemical Oxygen Demand. The highest Volatile Fatty Acid and ethanol production occur in the 48th hours of reactor operation. Significant organic removal occur on HRT of 96 hours at 53,34%. The production of biogas as methane was 14,0-14,6% (v/v) at HRT 96 hours and 29,1-29,6% (v/v) at HRT 72 hours showing a dominant acidogenesis process compared to methanogenesis process.Key words: Anaerobic Baffled Reactor, biogas, Soluble Chemical Oxygen Demand, tofu wastewater, Volatile Fatty Acid

KINETIKA DEGRADASI LIGNIN DARI LIMBAH CAIR INDUSTRI PULP AND PAPER MENGGUNAKAN ADVANCED OXIDATION PROCESS (AOP) DENGAN KOMBINASI OZON DAN HIDROGEN PEROKSIDA Ristiawan, Ardhi; Syafila, Mindriany
Jurnal Teknik Lingkungan Vol 21, No 1 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Abstrak: Secara umum, air limbah industri pulp and paper mengandung produk ekstraktif, karbohidrat, dan lignin. Lignin dan senyawa chlorinated organic merupakan senyawa utama yang menjadi concern dalam potensi pencemaran lingkungan. Pengolahan biologi secara konvensional hanya dapat mengolah sebagian senyawa organik yang terkandung dalam air limbah karena beberapa senyawa dalam air limbah industri pulp and paper merupakan senyawa persisten. Advanced oxidation process (AOP) merupakan alternatif dalam mendegradasi senyawa resistan yang terdapat dalam limbah cair industry pulp and paper. Prinsip pada proses AOP adalah pembentukan hidroksil radikal (OH*) yang merupakan molekul dengan kemampuan oksidasi yang sangat kuat sehingga dapat mendegradasi senyawa organik kompleks menjadi CO2 dan H2O. Salah satu teknologi AOP adalah O3/H2O2 (peroxone). Penggunaan metode ini lebih efektif jika dibandingkan dengan penggunaan O3 atau H2O2 secara sendiri-sendiri Pada penelitian ini akan dilakukan proses AOP menggunakan O3/H2O2 untuk mendegradasi lignin. Variasi feeding rate ozon, H2O2, dan waktu dilakukan pada sampel limbah cair untuk mengetahui kondisi optimal. Hasil menunjukkan bahwa penambahan dosis H2O2 pada proses ozonasi dapat meningkatkan efisiensi proses. Namun pada konsentrasi H2O2 berlebih dapat menjadi scavenger sehingga menurunkan efisiensi proses. Kondisi optimum diperoleh pada feeding rate ozon 26,7 ppm/dtk dan dosis H2O2 selama 2 jam pada pH asli limbah (7-8). Penyisihan COD pada kondisi tersebut sebesar 28% dan penyisihan lignin sebesar 88%. Biodegradabilitas air limbah menunjukkan peningkatan. Rasio BOD/COD meningkat dari 0,11 menjadi 0,33. Kata kunci: Advanced Oxidation Process (AOP), ozon, hidrogen peroksida, lignin Abstract: In general, pulp and paper wastewater contain extractive products, carbohydrates and lignin. Lignin and chlorinated lignin are the main compounds that could be potentially pollute environment. Conventional biological treatments only treat organic compounds partially because some organic compounds in pulp and paper wastewater are persistent organic compounds. Advanced oxidation process (AOP) is an alternative to degrade resistant compounds that contained in wastewater from pulp and paper industry. The principle of AOP is formation of hydroxyl radicals (OH*) which is a molecule with a very strong oxidizing ability that can degrade complex organic compounds to CO2 and H2O. O3/H2O2 (peroxone) is one of AOP?s technologies. This method is more effective then uses O3 or H2O2 alone. This study conducted AOP process using O3/H2O2 for lignin removal. Variations of ozone feeding rate, H2O2, and reaction time conducted to determine the optimal condition. Results showed that the addition of H2O2 doses on ozonation process can improve the efficiency of the process. But the excedd concentration of H2O2 could be a scavenger thus reducing the efficiency of the process. The optimum condition obtained in the ozone feeding rate of 26.7 ppm/sec and 100 mg/l dose of H2O2 for 2 hours at the original pH of wastewater (7-8) with 28% COD removal and 88% lignin removal. Ozonation combined by H2O2 increased biodegradability of wastewater. BOD/COD ratio increased from 0.11 to 0.33. Keywords: Advanced Oxidation Process (AOP), ozone, hydrogen peroxide, lignin

PENGARUH PLAT GRAFIT DAN TEMBAGA TERHADAP KINERJA PROSES PENGOLAHAN LIMBAH CAIR INDUSTRI BATIK YANG MENGANDUNG LOGAM ZN MENGGUNAKAN METODE ELEKTROLISIS Hermawan, Robby; Syafila, Mindriany
Jurnal Teknik Lingkungan Vol 23, No 1 (2017)
Publisher : ITB Journal Publisher, LPPM ITB

Abstrak: Batik merupakan salah satu budaya warisan dunia yang telah ditetapkan UNESCO. Semenjak saat itu permintaan produksi batik meningkat. Limbah cair batik telah banyak diolah dengan berbagai macam proses biologi. Namun pada penelitian ini akan mengolah limbah cair batik dengan pengolahan secara fisika-kimia. Elektrolisis akan memecah molekul air limbah dengan aliran arus listrik searah dan bantuan senyawa elektrolit seperti NaCl sehingga dihasilkan reaksi redoks. Limbah cair berasal dari industri batik rumahan yang terletak di kawasan lembang. Limbah cair diolah menggunakan dua macam variasi elektrolisis yaitu, tegangan dan jenis elektroda. Variasi pertama elektroda yang digunakan adalah grafit pada anoda maupun katoda dan akan dialirkan tegangan yang bervariasi mulai dari 5 volt, 15 volt dan terakhir 48 volt. Variasi yang kedua adalah penggunaan grafit pada anoda dan tembaga pada katoda dengan tegangan yang dialirkan sebesar 5 volt, 15 volt dan 48 volt. Berdasarkan uji karakteristik awal limbah ditemukan bahwa Zn sebesar 340,76 mg/l. Dengan pengolahan elektrolisis variasi pertama menggunakan elektroda grafit-grafit dihasilkan penyisihan Zn optimum pada tegangan 48 volt selama 8 jam sebesar 89,74% dan variasi dengan grafit-tembaga optimum pada tegangan 48 volt selama 48 jam sebesar 90,26%. Variasi menggunakan pH dan NaCl pada elektroda grafit-grafit dihasilkan 92,73% penyisihan pada pH 10 dan NaCl 0 gr/l. pada elektroda grafit-tembaga penyisihan sebesar 94,7% dengan pH 10 dan NaCl 5 gr/l. Kata kunci: elektrolisis, anoda, katoda, grafit, tembaga Abstract: Batik is one of the world's cultural heritage that has been designated by UNESCO. Since that time the demand for batik production increases. Batik wastewater has been treated with a variety of biological processes. In this study, Batik wastewater will treat with physico-chemical process. Electrolysis will break down the wastewater molecules to flow electric current direction and assistance electrolyte compounds such as NaCl so that the resulting redox reactions. Home industrial wastewater which located in the lembang. Wastewater is processed using two kinds of electrolysis variations, those are voltage and type of electrodes. First variation electrode used is graphite on the anode or cathode and will be streamed voltages ranging from 5 volts, 15 volt and 48 volt. The second variation is the use of graphite in the anode and copper cathode supplied with the voltage of 5 volts, 15 volts and 48 volts. Based on preliminary detected metal is Zn amounted to 340,76 mg/L. With the first variation electrolysis process using graphite-graphite electrodes most optimum Zn removal at 8 th hour with 48 volt is 89,74% and using graphite-copper electrodes most optimum zn removal at 48 th hour and 48 volt is 90,26%. Variation using pH and NaCl with graphite-graphite electrodes resulted 92,73% zn removal at pH 10 and NaCl 0 gr/l.Using graphite-copper electrodes resulted 94,7% zn removal at pH 10 and NaCl 5 gr/l. Keywords: electrolysis, anode, catode, graphite, copper

REDUKSI UKURAN ADSORBEN UNTUK MEMPERBESAR DIAMETER PORI DALAM UPAYA MENINGKATKAN EFISIENSI ADSORPSI MINYAK JELANTAH Alimano, Marsen; Syafila, Mindriany
Jurnal Teknik Lingkungan Vol 20, No 2 (2014)
Publisher : ITB Journal Publisher, LPPM ITB

Abstrak: Pada penelitian yang telah dilakukan, dengan reduksi ukuran partikel hingga dibawah 2 ?m dapat menghasilkan diameter pori yang masuk klasifikasi mesopori (2 ? 50 nm). Uji kemampuan bentonit dan zeolit mesopori sebagai penjerap untuk meningkatkan kualitas minyak jelantah agar dapat digunakan kembali telah dilakukan dengan metode batch. Konsep batch dipilih karena tujuan penelitian adalah untuk mengetahui secara pasti parameter yang paling berpengaruh terhadap proses penjerapan dari variabel yang telah ditentukan. Penelitian dilakukan dengan variasi waktu 40, 55, dan 70 menit. Dosis penjerap sebagai variabel utama ditentukan 5, 15, dan 25%. Kecepatan pengadukan merupakan parameter yang berpengaruh terhadap tingkat kesempurnaan perlekatan ditentukan pada skala 3 dan 6 (225 dan 450 RPM). Dari hasil penelitian ditunjukkan bahwa kemampuan penjerapan bentonit dan zeolit mesopori dapat secara sempurna menghasilkan kualitas minyak goreng yang baik dari parameter warna, dimana kondisi optimum tercapai pada waktu proses 70 menit, dosis penjerap sebesar 25%, dan kecepatan pengadukan pada skala 6 (450 RPM) dengan nilai absorbansi sebesar 0,0117 Abs untuk bentonit (efisiensi 88,26%) dan 0,0100 Abs (efisiensi 89,97%) untuk zeolit dengan blanko minyak goreng baru sebesar 0,0000 Abs dan minyak jelantah sebesar 0,0997 Abs yang diukur pada panjang gelombang489,2 nm. Selain itu, hasil percobaan mendapatkan efisiensi penurunan nilai asam lemak bebas optimum mencapai 68,75% (bentonit) dan 62,50% (zeolit), jauh diatas hasil percobaan dengan penetralan basa dan menggunakan adsorben bentonit teraktivasi (31,28%) dan tanah diatomit (43,36%). Dari hasil tersebut maka dapat ditarik kesimpulan bahwa reduksi ukuran adsorben yang akan meningkatkan luas permukaan, volume pori, dan radius pori dapat meningkatkan efisiensi adsorpsi minyak jelantah pada parameter warna dan asam lemak bebas secara signifikan Kata kunci: bentonit, zeolit, mesopori, minyak jelantah, penjerapan Abstract : In the research result, by using particle size reduction to less than 2 ?m, it can produce pore diameter were into mesoporous classification (2-50 nm). The ability testing for bentonite and zeolite mesopores as an adsorbent to improve the quality of used cooking oil so it can reuse, has been conducted by using a batch method. The batch concept selected because of research purpose was to determine the proper parameters that most influenced on the adsorbency process from predetermined variables. The research was conducted with the variation of time of 40, 55, and 70 minutes. The adsorbent dose as the main variable determined at 5, 15, and 25%. Stirring speed was a parameter affected the level of adhesion perfection that is determined on a scale of 3 and 6 (225 and 450 RPM). From the study results, indicated that the adsorbent ability of bentonite and zeolite mesopores could produce a good quality of cooking oil perfectly from color parameters, where the optimum condition reached during 70 minutes in process, adsorbent dose by 25%, and stirring speed on a scale of 6 (450 RPM) with the absorbency values of 0.0117 Abs(efficiency 88.26%) for bentonite and 0.0100 Abs (efficiency 89.97%) for zeolite, with a new form of cooking oil at 0.0000 Abs and used cooking oil at 0.0997 Abs. The form used was origin cooking oil before it used for frying, and its wavelength spectrophotometer used at 489.2 nm. In addition, the results of the experiment to get the efficiency of free fatty acid impairment optimum reach 68.75% (bentonite) and 62.50% (zeolite), well above the results of experiments with alkaline neutralization and use of activated bentonite adsorbent (31.28%) and soil diatomite (43.36%). From these results it can be concluded that the reduction in the size of the adsorbent will increase the surface area, pore volume and pore radius can enhance the adsorption efficiency of cooking oil on the parameters of color and free fatty acids significantly. Key words: bentonite, zeolites, mesoporous, used cooking oil, adsorption

The Effect of Nitrogen Gas Flushing on Intermediate Products Formation in Acidogenic Stage of Anaerobic Process of Cocoa Sweatings Mindriany Syafila; Marisa Handajani; Adearty Prayascitra
Journal of Engineering and Technological Sciences Vol. 42 No. 2 (2010)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2010.42.2.2

Cocoa is one of Indonesian-main plantation commodities. During the cocoa seed drying process, there are two types of waste that are cocoa pod and cocoa sweating. Since the organic compounds contained in cocoa sweating is high enough, it is possible to anaerobically treat this wastewater in order to recover either intermediate or end products. Preliminary study showed that the existence of H2 in the reactor would block acetic acid formation. Therefore, the aim of this current experiment was to decrease hydrogen partial pressure by flushing various nitrogen gas flow rate to shift the intermediate products during the cocoa sweating anaerobic treatment. The experiments were carried on a Circulating Bed Reactor (CBR) which contained organic compounds around 100,000 mg/l COD. Then, the reactor was flushed continuously with nitrogen gas as without flushing, 125 ml/min, 500 ml/min and 750 ml/min. The results show there was a possibility that the introduction of nitrogen gas into the reactor could shift the profile of the intermediate product formation. At lower nitrogen gas flow rate more ethanol was formed than acetate formation, although at higher nitrogen gas flow rate the formation of acetate was still low enough.

The Effect of Ozonation Process on Bromide-Containing Groundwaters in Bandung Area and Its Surroundings Mindriany Syafila; Sukandar Sukandar; Eric Haryanto
Journal of Engineering and Technological Sciences Vol. 44 No. 3 (2012)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2012.44.3.3

Disinfection process was applied as the last step of the water treatment to kill pathogenic bacteria in the water. However, according to several studies, the ozonation disinfection process could form undesired by-products. One of the by-products potentially affecting human life is bromate produced from bromide ionic-containing water. This study was carried out to examine the effect of raw water characteristics and pH on bromate formation. Also, the performance of bromate formation for a period of exposure time was analyzed. Raw waters taken from four different areas around Bandung were exposed to ozone introduced to a reactor with a flow rate of 2 L/min. The pH of the raw waters varied from 4, 7 to 10. The results show that there was no evidence of an initial bromide ion concentration, whereas a change in pH value gives a significantly different outcome. In acidic condition (pH of 4) the bromate formation tends to decrease, whereas when the pH value increases to a pH of 10, the bromate formation increases. Therefore, for drinking water with a neutral pH, when bromide ions are detected in the raw water, the drinking water may be toxic due to the presence of bromate.

PENGARUH JENIS ANODA PADA PROSES PEMULIHAN LOGAM NIKEL DARI TIRUAN AIR LIMBAH ELECTROPLATING MENGGUNAKAN SEL ELEKTRODEPOSISI Djaenudin Dhaenudin; Mindriany Syafila; Edwan Kardena; Isdiriayani Nurdin
Reaktor Volume 14, No. 3, APRIL 2013
Publisher : Dept. of Chemical Engineering, Diponegoro University

EFFECT OF ANODES TYPES ON NICKEL RECOVERY FROM SYNTHETIC ELECTROPLATING WASTE ELECTRODEPOSITION CELLS. A study concerning the recovery of nickel from electroplating wastewater artificial solution. The study was conducted with a batch system using electrodeposition cell consisting of two spaces separated by water hyacinth leaf, copper cathode plate, H2SO4 solution anolyte, catholyte solution of NiSO4 plus NaCl supporting electrolyte and anode varied. Electrodeposition performed at the direct current of 5V power for 4 hours each run. The research objective was to obtain the best anode in nickel electrodeposition process of electroplating waste artificial solution. Graphite, stainless steel type AISI 316 and the lead were used as a variation of the anode. Concentration of nickel in the catholyte at baseline 2200 mg/L. The results showed that the anode was a graphite anode with best value decreased by 72.44% nickel concentration, deposition of nickel on the cathode of 0.188 grams and specific energy values of 6.1625 kWh/kg.nickel. Telah dilakukan penelitian tentang pemulihan logam nikel dari larutan tiruan air limbah electroplating. Penelitian dilakukan dengan sistem batch menggunakan sel elektrodeposisi yang terdiri dari dua ruang yang dipisahkan dengan daun eceng gondok, katoda pelat tembaga, anolit larutan H2SO4, katolit larutan NiSO4 ditambah elektrolit pendukung larutan NaCl dan anoda divariasikan. Elektrodeposisi dilakukan pada listrik searah sebesar 5V selama 4 jam setiap tempuhan. Tujuan penelitian adalah memperoleh anoda terbaik pada proses elektrodeposisi nikel dari larutan tiruan limbah electroplating. Grafit, Stainless Steel tipe AISI 316 dan timbal digunakan sebagai variasi jenis anoda. Konsentrasi nikel dalam katolit pada awal penelitian 2200 mg/L. Hasil penelitian menunjukkan bahwa anoda grafit merupakan anoda yang paling baik dengan nilai penurunan konsentrasi nikel sebesar 72,44%, deposisi nikel di katoda sebesar 0,188 gram dan nilai energi spesifik sebesar 6,1625 kWh/kg.nikel.

Kajian Biodegradasi Limbah Cair Industri Biodiesel pada Kondisi Anaerob dan Aerob Mindriany Syafila; Tjandra Setiadi; Abdul Haris Mulyadi; ESMIRALDA Esmiralda
Journal of Mathematical and Fundamental Sciences Vol. 39 No. 1-2 (2007)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Penelitian ini bertujuan untuk menangani limbah yang terjadi dari industri biodiesel. Air limbah yang dihasilkan dari industri biodiesel diperkirakan memiliki kandungan organik yang cukup tinggi. dengan demikian perlu dipertimbangkan untuk mengolahnya dengan proses anaerob, sehingga berpotensi untuk mendapatkan produk samping berupa biogas (gas metana). Namun demikian, proses aerob sebagai kelanjutan degradasi secara anaerob harus pula ditinjau, karena masih adanya kandungan organik yang tersisa setelah proses anaerob. Hasil penelitian menunjukkan bahwa efisiensi proses anaerob masih kecil yang ditunjukkan oleh hasil uji Biochemical Methane Potential (BMP) yang hanya sekitar 30%, akan tetapi dari uji Anaerobic Toxicity Assay (ATA) tampak bahwa limbah cair tidak menghambat pertumbuhan mikroorganisme metanogen. Kinerja proses aerob juga belum menunjukkan hasil yang maksimal, karena efisiensi biodegradasi baru sekitar 75-80%. Hal ini karena proses aerob seharusnya ditujukan untuk mengolah lebih lanjut efluen proses anaerob.

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