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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
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Articles 3,145 Documents
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Fermentasi Asam Asetat Dari Nira Nipah (Nypa Fruticans) Menggunakan Acetobacter Pasteurianus Dengan Variasi Volume Inokulum Dan Waktu Fermentasi Triani, Leni; Chairul, Chairul; Yenti, Silvia Reni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The main products are nipah sap which isobtained from not fruit bunches with high sugar concentrations so as to provide an opportunity in the utilization of nipah sap to be acetic acid. Acetic acid can be produced naturally from ingredients containing sugar through fermentation using bacteria. The variation of inoculums acetobacter pasteurianus is 10%,13% and 16% and the time of acetic acid fermentation is 1, 3, 5, 7 and 9 days. The results of the analysis using the Nelson-Somogyi reagent revealed that the initial sugar concentration was 162,97 g/L. time of bioethanol fermentation is 24 hours. The maximum concentration of acetic acid obtained was 27,22 g/L with a pH 0f 3,47 and yield 33,09%. This maximum concentration was obtained on 9 days of acetic acid fermentation at 13% of acetobacter pasteurianus inoculums.Keywords : Acetobacter Pasteurianus, acetic acid, fermentation, inokulum, nipah sap.
Analisis Kemampuan Ruang Terbuka Hijau (RTH) Publik Dalam Mereduksi Emisi Karbon Dioksida (CO2) Dari Kegiatan Transportasi Di Kecamatan Bangkinang Kota Rezka Rahayu Febri; Aryo Sasmita; Jecky Asmura
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The green open space is one of an effort in order to handling of the increasing the greenhouse gas emission, because green open space has an ability to absorbing the CO2 emission. The purpose of this research is to find out the CO2 emissions from transportation activities, knowing the ability of absorption of CO2 by the public’s green open space, analyze the level of absorption of CO2 by green open space from transportation activity, and to plan for the addition of public’s green open space in Bangkinang Kota district. The method in this research is calculate the value of CO2 emissions, counting the trees which has diameters more than 20 centimeter, and calculate the area of vegetation cover. The sufficiency of green open space was analyze and then compared the absorbing power of CO2 by trees with number of CO2 emissions that produced. Bangkinang Kota district is produced the CO2 emissions from transportation which is high enough as much as 32.884.770,640 kilograms CO2/year. While the ability of CO2 absorption by the public’s green open space in Bangkinang Kota district only 1.178.356,154 kilograms CO2/year. The result of analysis show that the public’s green open space in Bangkinang Kota district that viewed from absorbing CO2 emissions of transportation is still not enough with percentage is only about 3,59%. The absorbtion rate of public’s green open space is planned to reduce all CO2 emissions from transportation activities in Bangkinang Kota district is equal to 34.510.474,20 kilograms CO2/year.Keywords: Greenhouse Gas, Co2 Emissions, and Green Open Space
Analisis Evaluasi Pemanfaatan Sumber Daya Air Di Das Batang Arau Kota Padang Menggunakan Program Linier Putri, Jeffilianti Tri; Sujatmoko, Bambang; Fauzi, Manyuk
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

The Batang Arau basin consists of seven sub districts, namely Padang Selatan Sub district, Padang Barat Sub district, Padang Timur Sub district, North Padang Sub district, Bungus Teluk Kabung Sub district, Lubuk Begalung sub district, and Lubuk Kilangan sub district. The city of Padang currently developing, consequently changes land use, fearing the potential and volume of water discharge in the Batang Arau basin will experiencing a shortage due to lack of water absorption. Due to limit water resources, an evaluation of the utilization of water resources is conducted using the QM for Windows 5 program. Depenable discharge and water requirements of each sector are the constraint that are input into a linear program. The results of the evaluation of this water utilization analysis obtained 121 industries, 1,219 beds in hotels, 2,199 beds in hospitals, and 470,088 denizen and 1,785 ha of irrigation with three alternative cropping patterns. Of the several alternatives, the biggest profit is obtained in alternative I with a profit of Rp.58,669,796,046.00/year. Based on the evaluation of water utilization analysis, it was found that the condition of the Batang Arau basin until 2017 was not a deficit.Keywords: Water utilization, linear programming, QM For Windows 5
Aklimatisasi Bakteri Rumen Sapi Pada Pengolahan Palm Oil Mill Effluent Maulani, Annisa; Andrio, David; Evelyn, Evelyn
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Palm oil mill effluent (POME) has high chemical oxygen demand (COD) content of 44.444 mg/L causing the most suitable processing technology is anaerobic digestion. This research aimed to study soluble COD removal efficiency and bacteria growth rate as VSS in acclimatization process of rumen fluid as inoculum addition in POME treatment. Acclimatization I was conducted in circulating bed reactor (CBR) with working volume 20 L, ratio of glucose : POME inside the reactor is 50% : 50% (%v/v). Meanwhile, acclimatization II was conducted in upflow anaerobic sludge blanket (UASB) with working volume 10 L, ratio of glucose : POME inside the reactor is 0% : 100% (%v/v). Acclimatization I and II was done in 20 and 50 days with soluble COD removal efficiency 80,36% and 65,41%, respectively. Meanwhile, bacteria growth rate as VSS has amount of 277 mg/L/day and 429 mg/L/day, respectively.Keywords: palm oil mill effluent, acclimatization, mixed culture bacteria, glucose, soluble COD, VSS
Total Jumlah Hewan Ternak Yang Dihasilkan Dari Kegiatan Peternakan Kota Pekanbaru Zoebar, M. Arif Yutaro; Sasmita, Aryo; Edward, Edward
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

The results of the study show that the total amount of CO2 emissions equivalent produced by livestock in Pekanbaru is 36.19 Gg CO2-eq/year, while agriculture sector contributes 72.26 Gg CO2-eq/year. There are, in total, 7,102,134 cattle in Pekanbaru, with the estimation of total methane (CH4) emissions from enteric fermentation of 6,64642 Gg CO2-eq/year, while from manure management is 6.60444 Gg CO2-eq/year. The direct and indirect emissions of nitrous oxide (N2O) are 117,255.74 kg CO2-eq/year, and from the manure management is 110,014.72 kg CO2-eq/year of year 2017. The research concludes the total emissions of green house gas produced by livestock and agriculture sectors as well as a course of mitigation action that can be to reduced by adaptation efforts to deal with climate change in Pekanbaru.Keywords: Green House Gas, Livestock, Agriculture, Methane
Stabilisasi Tanah Gambut Menggunakan Geopolimer Hybrid Erwin Erwin; Gunawan Wibisono; Monita Olivia
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Peat soil has high moisture content and organic content. Peat soil is stabilized to improve soil properties and increase its strength. This study examines stabilization mixtures on peat soil with geopolymers hybrid. Geopolymers are alternative substitutes for cement, made from remnants of industrial waste which rich of silica and alumina, such as fly ash, husk ash, slag and palm ash. The geopolymer bond can be activated with an activator solution. Geopolymers were added by OPC to accelerate hardening and optimize strength on the ground. The purpose of this study is to compare the compressive strength of peat soil mixed with the soil geopolymer hybrid using an Unconfined Compressive Strength (UCS) Test. This study used a different variation of the treatment that are the age of 7 days and 28 days. Binder for the mixed set of 200 kg/m3 with geopolymer materials used by 50% of the binder and the OPC which was used by 50% and 100% of the binder. The results showed that the compressive strength with hybrid geopolymer mixture tends to increase from 7 days to 28 days and the compressive strength of geopolymer hybrid is higher than peat. Based on the results of this test it is concluded that peat soil using a mixture of hybrid geopolymer could increase the value of compressive strength.Keywords: peat soil, OPC, fly ash, geopolymer hybrid, UCS
Pengaruh Pretreatment Inokulum Terhadap Proses Aklimatisasi Degradasi Anaerob Shella Zahrawani; David Andrio; Evelyn Evelyn
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Palm Oil Mill Effluent (POME) has total COD concentration 44.444 mg/L, with the high value of total COD it is very suitable to be processed anaerobically. To maximize the process of degradation of the substrate by bacteria can be done by the process of adapting bacteria or which can be called the acclimatization process. This acclimatization process uses two types of substrate, glucose and POME. The use of bovine rumen which is a mixed culture bacteria as an inoculum can benefit because of the diversity of microorganisms contained in it. This study was conducted in Circulating Bed Reactor (CBR) as semi batch reactor with working volume of 5L, ratio of substrate : inoculum = 70:30 %(v/v). This research aimed to study the effect of pretreatment inoculum in order to increase substrate degradation. This process was done in five days for every substrate with removal efficiency of soluble COD and growth rate of VSS in acclimatization phase I was 83,33% and 1.333 mg/L/day and in acclimatization phase II was 75% and 2,000 mg/L/day, respectively.Keyword: Palm oil mill effluent, Acclimatization process, Mixed culture bacteria, soluble COD, VSS
Kultivasi Mikroalga Menggunakan Media AF6 Berdasarkan Perbedaan Intensitas Cahaya Nova Diyana Nurhanifah; Padil Padil; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Microalgae cultivation use AF6 media based on light intensity difference has done in this research. Light intensity has an important function in the process of photosynthesis. Optimization of light intensity is expected to increase growth microalgae. In the microalgaecultivation of laboratory scale used light lamp for substitute sunlight. This research purpose for determine the effect of light intensity differences on spesific growth rate on various microalgae cultivated in AF6 media. In this research observations of cell density microalgaechlorella sp. (6) and chlamydomonas sp. (4, 5, 19, chl) at media AF6 on the variation intensity 500 lux, 1.000 lux and 1.500 lux are did with testing the optical density of each microalgae with wavelength of 680 nm using UV-VIS spectrophotometer. The research resultexplain specific growth rate and shortest doubling time occurred in the light intensity 1.500 lux. Microalgae which has spesific growth rate and shortest doubling time are microalgae Chlorella sp.with value 0,78/day, and 0,88 day respectively.Keywords: light intensity, density, growth, microalgae
Perbandingan Kinerja Rangka Terbuka Dengan Dan Tanpa Pengaruh Flat Slab (Studi Kasus Gedung Transmart Pekanbaru) Syamsul Fikri; Zulfikar Djauhari; Reni Suryanita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

A flat slab is a building structure component that uses a portal system and a plate that is directly supported by a column with or without plate thickness at the top of the column (drop panel). Flat slabs are still rarely used in the city of Pekanbaru, because there are still many conventional plates used. To determine the performance of each structural system, it is necessary to examine the influence at the flat slab and conventional plate system to the performance of the structure of the building. The purpose of this research is to identify the effect of flat slabs on the reinforced concrete open frame structure systems and comparing them with conventional structural systems. Two models were constructed, model 1 was the original Transmart Pekanbaru Building model, while model 2 replaced the flat slab on the ground floor with a 600x400 beam. The results showed that the story drift value in model 1 was very large compared to a model 2 with a comparison value of 60,00 in the direction X and 11,50 in the direction Y. Based on story drift in model 1 and model 2, the building structure has met the requirements for the story drift permit of 0.6 on the ground floor and 0.1 on the 1st to 3rd floors. So that it can be concluded that conventional systems are better than flat slabs because beam factors greatly affect the displacement of a building structure.Keywords: flat slab, conventional plate, story drift
Perbandingan Penyisihan COD Dari Limbah Cair Produksi Minyak Sawit Menggunakan Bakteri Kultur Tercampur Dan Kultur Tunggal Putri, Gustriana; Andrio, David; Amraini, Said Zul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Palm oil mill effluent (POME) has a COD content of 44,444 mg / L. The use of mixed cultures and single cultures such as Saccharomyces cerevisiae in removing Chemical Oxygen Demand (COD) has the advantage of being able to adapt to mixed substrates. This research aims to study the comparison of COD removal from POME using mixed culture bacteria and single culture. This study was conducted in a batch system using Circulating bed reactor (CBR) with a working volume of 20L and 5L, the ratio of inoculum: substrate = 30%: 70%. The results showed that the efficiency of dissolved COD removal in mixed cultures was proportional to a single culture that was equal to 42% with a removal rate of 1.114 mg / L / day. Meanwhile, the growth rate of VSS in mixed culture bacteria was 2.800 mg / L / day and a single culture was 2.667 mg / L / day.Key words: Palm oil mill effluent, mixed culture bacteria, single cultures, COD Removal, VSS

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