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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Articles 3,145 Documents
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Analisis Percepatan Terhadap Waktu Proyek (Study Kasus : Kantor Dinas SKPD Gedung B3 Di Tenayan Raya) Pratama, Aditya; Taufik, Hendra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Project implementation have always refers to the construction assumption and forecast while time plans and schedule were made, Therefore, the contruction problem will arise if there is a discrepancy between plan and assumptions comparing to the actual project. Delays of project implementation is generally always lead to adverse consequences both for the owner and contractor. The project the (SKPD) Unit City Government of Pekanbaru in Riau is having a delay of 75 days. The Best construction time acceleration is 45 days. Construction acceleration can be conducted by 3 alternatives solutions such as: overtime alternative, equipment and workers addition alternative, and shift system alternative. The analysis started from the critical path. Network project the analysis, was obtained from the cost due to delay stands at Rp. 4.761.786.975,00. Cost of construction acceleration caused by overtime alternative is Rp. 2.152.360.596,00 with a total 11.136 hours of extra work for workers, cost of construction acceleration by the workers and equipments additionionally for alternative result Rp. 2.434.965.492,00 with a total 14 new workers, with additional of 2 new equipment units. Cost of construction acceleration from shift alternative is Rp. 2.434.965.492,00 with a total of 14 new workers, a total 2 of equipment units. In conclusion, the most effective construction acceleration method is overtime alternative, obtained the minimum financial loss and recommended to use for the construction acceleration.Keywords : construction delay, construction cost, duration shortening, overtime, work equipment and workers additional.
Kekuatan Dan Lendutan Elastis Kolom Semi Pracetak Akibat Beban Aksial Eksentrik
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This paper present a numerical simulation of four combine of normal-strenght and light-strenght concrete tied column. In this specimens, normal strength used as core concrete and light- strength used as shell concrete. The columns, with normal compressive strength is 23 MPa, and light strength concrete is 10 MPa. The columns had rectangular cross section with total dimension is 290×290 mm and the dimension of core concrete is 230×230 mm. The columns were subjected to axial and longitudinal loads, with various eccentricity (50 mm, 100 mm, 150 mm, and 200 mm). The columns analyzed with Software Abaqus CAE Student Edition 6.14-2. From the software the result are the elastic load-mide displacement and crack pattern. The analysis showed that the same eccentricity, the maximum axial load of 2.99 column is smaller than the theoretical concrete columns. While the maximum moment concrete column 2.55 less than the theoretical concrete columns. The column stiffness 0.29 kN/m. By using CAE Abaqus Student Edition Software 6.14-2 obtained deflection value of the total of 0.07 m on the eccentricity of 200 mm . And the smallest deflection of 0,031 m on the eccentricity of 50 mm.Keyword: Hybrid concrete compression, eccentricity axial load, Abaqus CAE Student Edition 6.14-2.
Perencanaan Sistem Penyaluran Air Limbah (SPAL) Di Perumahan Mutiara Permai Kota Pekanbaru Syadli, Yudhi Hanafi; Asmura, Jecky; Elystia, Shinta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Mutiara Permai Recident do not have sewerage system facilities and on site sanitation systems. To solve this problems, planned a sewerage system and treatment of domestic wastewater is needed. The plan location consisting of 4 neighbourhood, service area covers the entire house totaling of 451 units. Sewerage system for residential use shallow sewer system that is domestic waste water (gray water and black water) directly connected using waste water pipes and sewerage systems with gravity system. Pipe dimensions is 100 mm for the waste water from the persil pipeline, 150 mm for service pipeline, 200 mm up to 560 mm for lateral pipelines, 560 mm for distributary pipeline and 800 mm for the main pipeline leading to the wastewater treatment plant (WWTP). For the continuity sewerage used manhole about 28 units.Keyword: Mutiara Permai Recident, Wastewater Domestic, SPAL
Adsorpsi Zat Warna Methylene Blue Menggunakan Spent Bleaching Earth Sebagai Adsorben Tejo Yulandi; Edy Saputra; Syarfi Daud
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The industrial waste especiallytextile waste is one of the causes of environmental problems that require effective and efficient processing. Adsorption is a separation method that is simple, easy to operate, flexible, affordable cost and does not produce toxic products. The purpose of this study calculates the efficiency of decreasing the concentration of the colors contained in metyhlene blue dye and studying the adsorption capacity to variations in pH, adsorbent mass and stirring time. The maximum wavelength of the dye methylene blue 660 nm. The efficiency of 99.973 % decline in the highest concentration. Isotherm corresponding to methylene blue dye adsorption by spent bleaching earth is Langmuir isotherm with adsorption capacity to variations in pH of 0.5035 mg/g, the adsorbent mass variation of 0.3816 mg/g, the stirring time variation of 0.5012 mg/g.Keywords : Adsorption, Methylene Blue, Spent Bleaching Earth, EfficiencyDecreased Concentration, Adsorption Capacity
Adsorpsi Logam Seng (Zn) Menggunakan Precipitated Calcium Carbonate (PCC) Dari Limbah Cangkang Kerang Lokan (Geloina expansa) Rahayu, Helda Sri; Elystia, Shinta; Azis, Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Zinc (Zn) was a heavy metal that has a high toxicity and the presencein water or wastewater could be derived from industrial activitiesand activities of households. One of technology that can be applied to set aside Zn metals in wastewater wasadsorption method using PCC (precipitated Calcium Carbonate) of waste shells seashell. Zn metal concentrations were analyzed using instruments Atomic Absorption Spectrophotometer (AAS). This research aims to study the PCC capabilities in designated metal Zn in the variation of the mass of adsorbent 1; 2;3 and 4 grams, pH 4; 6 and 8 and a contact time of 15; 30; 45 and 60 minutes. The results showed the highest removal efficiency of Zn occurs at pH 6, and 3 grams of adsorbent mass contact time of 30 minutes with an efficiency of 99.058%. While the lowest efficiency at pH 4, the mass of adsorbent 3 grams and 15 minutes contact time with an efficiency of 1.533%. The adsorption process was assumed that the type of adsorption isotherms obtained is Langmuir isotherm assumed monolayer coating formed with R2 values of 0.541 and the value of adsorption capacity is 7.274 mg Zn / g PCC.. The results of XRD analysis showedthat the crystal structure of the PCC (CaCO3) after adsorption shaped calcite are seen from a row of intensity of diffraction peaks with 2 values similar to standard CaCO3 ICDD 01-076-2713.Keywords:adsorption,PCC lokan calm shell, adsorbent mass, pH, contact time, Zn.
Pemanfaatan Precipitated Calsium Carbonate (PCC) Dari Limbah Cangkang Kerang Darah (Anadara Granosa) Sebagai Adsorben Pengolahan Air Gambut Dini Aulia Sari Ermal; Shinta Elystia; Yelmida Aziz
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

Peat water is surface water which has a dark brown to black, has a very high organic content, and acidic. There are negative effects if used directly and continuously without processing. This is because in the peat water was found humic acidcompound that makes the peat water has these characteristics. One effort to decrease the concentration of humic acid is through adsorption method. The adsorbent that usded was precipitated Calisum Carbonate (PCC) which originate from waste shellsblood.Variable that was given in this research consisted by mass variation PCC 1, 3, 5, and 7, the stirring speed of 50, 100, and 150 rpm and a contact time of 15, 30, 45 and 60 minutes. The maximum state was reached on the mass of PCC 5 grams, stirring speed of 150 rpm, and a contact time of 30 minutes with the adsorption efficiency of 99.86% . Decreasing concentration of adsorption of organic substances (humic acid) of 1450 mg / L to 2,07 mg / L. From this research PCC is able to adsorborganic substances (humic acid) so that the results that was obtained accordingly with some parameters PERMENKES 416 / Menkes / PER / IX / 1990.Keywords: Adsorptiodn, Peat Water, Shells of mussels blood, PCC
Kajian Pemanenan Air Hujan Sebagai Alternatif Pemenuhan Air Baku Di Kecamatan Bengkalis Yogi Septian Malik; Imam Suprayogi; Jecky Asmura
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Providing clean water is a major concern, because water is a basic need and is essential for life and health of mankind. Sourced from the Long Term Development Plan (RPJP) Riau Province 2005-2025 that meet the needs of clean water for domestic Riau Province large part still rely on shallow groundwater and service of the Regional Water Company (PDAM). Rainwater is a source of high quality water which is available every rainy season and has the potential to reduce the pressure on the use of fresh water resources (fresh water sources). Rainwater coming from the roof of the house is usually the cleanest water alternatives that can be used as a source of clean water one of them in the District of Bengkalis. This study aims to find out alternative clean water that can be used in the District of Bengkalis and determine the volume of rain water storage and rainwater harvesting design plan or Rainwater Harvesting. In this research, modeling Rain Cycle 2 is a rainwater harvesting modeling that uses some of the data, the data are derived from primary data in the form of extensive data roofs society, data on the number of family members in the head of the family, and the data of showers field. The results of this study rainwater harvesting by using a holding tank depends on the ability of people in the District Bengkalis income as well as extensive holdings community yard individual scale to meet the needs of clean water which ensures the availability of supply of clean water with a limited number of tanks.Keywords : Rain water harvesting , Rain Cycle 2 , raw water
Pengaruh Rasio Pencampuran Limbah Cair Tahu Dan Kotoran Sapi Terhadap Proses Anaerob Putra, Hadi Purnama; Andrio, David; Elystia, Shinta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

Consentration of COD total from tofu wastewater were 3.305 mg/L, was not supplied COD optimum criteria for anaerobic wastewater treatment, so it was necessary added cow dug which has concentration of COD concentration 10.730 mg/L. The combination of both types of wastewater will effect for C/N ratio that affects the formation of volatile fatty acids and biogas. This research aimed study the effect of the composition of the mixture of tofu wastewater and cow dung to efficiency reduction in COD total of the anaerobic process. The study was conducted in semi-batch, using a reactor with a working volume of 20 and 5 liters, inoculum ratio: waste = 80%: 20%. Before being used as sources of inoculum from WWTP oil and cow's rumen acclimatized beforehand by 0%: 100%, 50%: 50%, and 100%: 0%. The research used varioation a mixing ratio in the range R1 = tofu wastewater (25%) : cow dug (75%), R2 = tofu wastewater (50%) : cow dug (50%), and R3 = tofu wastewater (75%) : cow dug (25%). The result showed the reduction of COD total highest in R1 ratio was 782,68 mg/L/day and the lowest in R3 ratio was 277,06 mg/L. Formation the highest of biogas produced by R1 ratio was 50,4 mL and the lowest by R3 ratio with no formation of biogas volume.Keywords : Anaerobic process, biogas, tofu wastewater, cow dung, inoculum
Evaluasi Tingkat Kebisingan Di PT PLN (Persero) Unit PLTD/G Teluk Lembu Hesti Mulyani; Aryo Sasmita; Shinta Elystia
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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PT PLN (Persero) Unit PLTD/G Teluk Lembu in its operational activities potentially able to evoke noise from generator machines. The employees that are frequently exposed to the noise can affect the employees’ health and comfort. The purpose of this research is to determine the noise’s intensity from the generator machines, the length of exposure time, and the mapping of noise spread pattern. The noise measurement method is based on KepMenLH No 48 Tahun 1996, and the device that is used is Sound Level Meter (SLM). The measurement of sound pressure level (Leq) took place for 1 day. Based on the data processing result from 13 measurement spots, there are 9 spots that exceed the quality standards based on KepmenLH No. 48 Tahun 1996. The highest loudness level is 104,17 dB where this spot located very close from the noise source, and the lowest loudness level is on 74,41 dB where the distance is quite far from the noise source. The planned noise control attempt is by using noise barrier (naturally or artificially), isolate the machines, machine care, the administration management, and the human resource management.Keyword: Loudness, noise, PLTD/G
Pengaruh Rasio Penambahan Acticomp Terhadap Degradasi Struktur Morfologi Tandan Kosong Kelapa Sawit Pada Proses Pengomposan Metode Windrow Nurfajri, Nabila; Yenie, Elvi; Edward, Edward
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Oil palm empty fruit bunches (OPEFB) is a solid waste that significantly produced by palm oil mills. The main content of OPEFB is lignocellulose. High lignin in OPEFB cause the lenghth time of OPEFB decompositition. The decomposition process can be accelerated by the addition of decomposers, such as acticomp. Therefore, this study aimed to analyze the degradation of structure morphology OPEFB also composting time and C/N ratio by the addition of acticomp. This research method using three variations of the ratio addition acticomp to 100 kg OPEFB composted, 0.5 kg acticomp, 1 kg acticomp and 1.5 kg acticomp. The comsposting process using windrow composting system. The results were obtained the damage of OPEFB morphological structure and the decreasing ratio of C/N whereas 1.5 kg acticomp/100 kg as the biggest within 30 days. C/N ratio reached 19.67, in accordance with the regulation of the quality standards 28/Permentan/SR.130/5/2009.Keywords: acticomp, OPEFB, degradation of OPEFB, morphological of OPEFB, windrow composting

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