检索结果-内蒙古大学图书馆

Life cycle assessment analysis of empty fruit bunches utilization: A case study in Riau province

AIP Conference Proceedings 2024年第1期3215卷

作者： Ayu Wulandari Djoko Mulyo Hartono Astryd Viandila Dahlan Environmental Engineering Study Program Department of Civil Engineering Universitas Indonesia Depok Indonesia

Palm oil consumption has risen due to an increasing preference for vegetable oil. However, this growth in the palm oil industry has given rise to various challenges, especially concerning environmental issues and emissions. This study evaluated the ecological consequences of using empty palm fruit bunches in plantations and furnaces and utilizing solid waste from empty fruit bunches as a renewable energy source. The research findings indicate that, for a 30 tons/hour capacity, the total greenhouse gas emissions (GWP) in the furnace and plantation management amount to 234.72 kg CO2 eq and 234.69 kg CO2 eq, respectively. The acidification impact (0.51 kg SO2 eq) and the eutrophication (0.95 kg PO4 eq) in the plantation and the furnace. For a 60 tons/hour capacity, the total GWP increases to 328.59 kg CO2 eq in the furnace and 328.37 kg CO2 eq in the plantation. Furthermore, acidification (0.73 kg SO2 eq) and eutrophication (1.33 kg PO4 eq) impacts persist in both the plantation and furnace stages. The primary concern highlighted in this research is furnace management, particularly concerning the oil content. Additionally, the production stage emphasizes the importance of raw materials as another critical hotspot. The study recommends implementing technological changes and adopting preventive maintenance practices to minimize the oil content in empty fruit bunches to mitigate the environmental impact during crude palm oil (CPO) production stages; utilizing empty fruit bunches as renewable energy presents an option to reduce greenhouse gas emissions.

关键词：

来源：评论

学校读者我要写书评

暂无评论

On the delay factors of the private construction projects in Medan city

引用

IOP Conference Series: Earth and Environmental Science 2018年第1期126卷

作者： A. Perwira Mulia Tarigan Subroto Teaching Staff Post Graduate Study Program of Civil Engineering Universitas Sumatera Utara Former Graduate Student Post Graduate Study Program of Civil Engineering Universitas Sumatera Utara

The delay in construction projects undertaken by contractors is impeding the economic growth of a region. Medan city which is one of the big cities in Indonesia is suffering from it. This study aims to identify the dominant factors causing delays in construction projects conducted by private contractors. The interview method with questionnaires is used to involve 20 contractors, 10 consultants, and 10 owner representatives in the study. From the 45 identified factors causing delays, the highest ranking is the change of work demand by the project owners with 71.84% importance index.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Adsorption and desorption of zinc and copper in acid mine drainage onto synthesized zeolite from coal fly ash

引用

Journal of Physics: Conference Series 2021年第1期1811卷

作者： Amalia Ekaputri Hidayat Setyo Sarwanto Moersidik Sandyanto Adityosulindro Environmental Engineering Study Program Civil Engineering Department Universitas Indonesia Depok – Indonesia

Synthetic zeolite is considered a more effective adsorbent due to its high purity and high removal efficiency. On the other hand, acid mine drainage contains various metal ions, such as zinc, copper, iron, and manganese which are toxic for the ecosystem in a certain concentration. One of the solutions to remove these metal ions is through adsorption. Therefore, the study of adsorption and desorption of zinc and copper onto synthetic zeolite was conducted. The synthetic zeolite was synthesized from coal fly ash and the acid mine drainage was prepared artificially. The adsorption experiment was carried out using a batch system. NaCl, H2SO4, and HNO3 were used as desorption agent. The adsorption studies revealed that the removal efficiency of both Zn2+ and Cu2+ onto the studied adsorbent decrease with the increase of adsorbate concentration. While the adsorption selectivity for multi-system synthetic AMD solution by the studied adsorbent were found to the order of Fe2+> Cu2+> Zn2+> Mn2+.After being reused three times, the synthetic zeolite shows a decrease in for Zn2+ and Cu2+ adsorption efficiency of about 10%. Furthermore, the desorption study shows the ineffective use of NaCl, H2SO4, and HNO3 as desorption agents in this study.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The utilization of hydroxylsodalite synthesized from coal fly ash for zinc removal in acid mine drainage

引用

IOP Conference Series: Earth and Environmental Science 2019年第1期353卷

作者： A E Hidayat S S Moersidik S Adityosulindro Environmental Engineering Study Program Civil Engineering Department University of Indonesia Depok Indonesia

One of the alternative solution to reduce ash waste in landfills is by utilizing coal fly ash for the removal of metal ion in wastewater, especially acid mine drainage (AMD). In this study, zeolite was synthesized from coal fly ash using a two-step method, hydrothermal and fusion method. The coal fly ash and the zeolite product were characterized physically and were used for the removal of Zn2+ in AMD. The adsorption experiment was carried out using batch method in synthetic AMD solution to study the influential parameters such as adsorbent dosage, contact time, adsorbent isotherms and kinetics. The zeolite synthesized in this study resulting hydroxylsodalite zeolite type, which increases the surface area. It was revealed from the adsorption experiment that the removal efficiency of Zn2+ was 93.47% under the conditions of pH ± 3, initial concentration Zn2+ 100 ppm, optimum contact time 120 minutes, and adsorbent dose 6 g/L. Furthermore, the Langmuir isotherm model and the kinetics model of pseudo-second-order fitted the adsorption data better, with the maximum sorption capacity of 27.32 mg/g. The result of this study indicate hydroxylsodalite synthesized from coal fly ash has great potential as an economical and sustainable material for the removal of metal ion Zn2+ in wastewater.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Badung river basin sustainable water resources management for mitigate the effect of climate change

引用

AIP Conference Proceedings 2024年第1期3110卷

作者： I. Gusti Agung Putu Eryani Made Widya Jayantari Civil Engineering and Planning Study Program Warmadewa University Denpasar 80239 Indonesia Civil Engineering Study Program Udayana University Kampus Unud Jimbaran Street Badung 80361 Indonesia

Climate change has significantly affected global water resources, impacting their quantity and quality. Altered precipitation patterns, driven by climate change, have disrupted rainfall frequency, intensity, and distribution, directly influencing hydrology and water quality. Various economic sectors face challenges due to fluctuating rainfall patterns caused by climate change. The Badung Watershed, spanning Denpasar City and part of Badung Regency, plays a crucial role in supplying water to the region. It frequently experiences overflow during heavy rainfall. Understanding how climate change might affect rainfall patterns in this area is essential for mitigating potential consequences, although no prior research has explored this topic. Recent data shows a 67.93 millimeter decrease in average annual rainfall in the Badung Watershed, along with an annual temperature increase of 0.03 to 0.14 degrees Celsius, reduced relative humidity by 0.14%, and slower wind speeds by 0.02 meters per second. To address these challenges and ensure sustainable water resources, recommended strategies include water use planning and regulation, water conservation efforts, ongoing climate monitoring, and incorporating climate resilience planning in water usage practices. These measures are vital for the region’s water resource management in the face of climate change.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Comparative Phosphorus Removal Efficiency from Municipal Wastewater Using Acid Mine Drainage Sludge and Its H2O2 Activated form As Adsorbents

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期721卷

作者： Irene Yulianto Setyo Sarwanto Moersidik Nova Amanda Environmental Engineering Study Program Civil Engineering Department University of Indonesia Depok - Indonesia

Acid mine drainage (AMD) sludge is by-product from AMD treatment that formed by iron deposition. This sludge has a potential to be used as an active adsorbent to remove phosphate from domestic wastewater. The adsorbent that was used in this research is AMD sludge from PT Bukit Asam Tbk., Tanjung Enim that majorly composed of Si, Fe and Al compound (determined by the XRD test). Phosphate adsorption was done by AMD sludge and MD sludge that was activated by hydrogen peroxide. Activation process by hydrogen peroxide affected the chemical and physic characteristic of sludge and it showed from the results that the concentration of Si, Fe and Al were shifted by 7.33%, 7.03%, and 1.49%, respectively. Meanwhile for the physical characteristic; specific surface area, pore volume, and pore size were shifted by 19.51 m2/g, 0.0635 cm3/g, and 142.694 nm, respectively. Phosphate removal by AMD sludge has a greater result than activated sludge. Adsorption capacity of AMD sludge was well described by Freundlich isotherm model, which is equal to 6.358 mg P/g. Meanwhile, adsorption capacity of activated sludge was well described by Langmuir isotherm model, which is equal to 0.48 mg P/g. Results in this study indicated that the activation process with hydrogen peroxide affects the ability of phosphate adsorption that was showed by the difference of removal percentage.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The effect of leachate recirculation with enzyme cellulase addition on waste stability in landfill bioreactor

引用

IOP Conference Series: Earth and Environmental Science 2018年第1期106卷

作者： N Saffira G A Kristanto Environmental Engineering Study Program Civil Engineering Department Universitas Indonesia Depok Indonesia

Landfill bioreactor with leachate recirculation is known to enhance waste stabilization. However, the composition of waste in Indonesia is comprised by organic waste which is lignocellulosic materials that considered take a long time to degrade under anaerobic condition. To accelerate the degradation process, enzyme addition is ought to do. Cellulase is an enzyme that can catalyse cellulose and other polysaccharide decomposition processes. Therefore, operation of waste degradation using leachate recirculation with a cellulase addition to enhance waste stabilization was investigated using anaerobic bioreactor landfill. The experiment was performed on 2 conditions; leachate recirculation with cellulase addition and recirculation only as a control. The addition of cellulase is reported to be significant in decreasing organic content, represented by volatile solid parameter. The volatile solid reduction in the cellulase augmented reactor and control reactor was 17.86% and 7.90%, respectively. Cellulase addition also resulted in the highest cellulose reduction. Settlement of the landfill in a bioreactor with enzyme addition (32.67%) was reported to be higher than the control (19.33%). Stabilization of landfill review by the decreasing rate constant of the cellulose and lignin ratio parameter was more rapidly achieved by the enzyme addition (0.014 day-1) compared to control (0.002 day-1).

关键词：

来源：评论

学校读者我要写书评

暂无评论

The Utilization of Sedimentation Pond Acid Mine Drainage Sludge as Coagulant to Reduce COD and TSS Concentration in Domestic Wastewater

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期721卷

作者： Nurul Shafira Daradjat Setyo Sarwanto Moersidik Environmental Engineering Study Program Civil Engineering Department University of Indonesia Depok–Indonesia

Acid mine drainage (AMD) treatment leaves residue in the form of sludge that contains large amounts of metal, silica, ferric, and alum. This research aims to determine the capabilities that AMD sludge-synthesized coagulant has in reducing COD and TSS concentration in domestic wastewater. The domestic wastewater sample used in this research is an artificial domestic wastewater with a COD concentration of 285 mg/l and a TSS concentration of 245.31 mg/l. After going through Acidification process, AMD sludge coagulant contains Si (43.66%), Fe (30.02%), dan Al (12.35%). A jar test is then performed in order to determine the optimal coagulant dosage. In this process, a coagulant dosage of 40 mg/; 60 mg/l; 80 mg/l; 100 mg/l; 140 mg/l; 180 mg/l; and 200 mg/l was used with 100 mg/l being the optimal coagulant dosage. The AMD sludge containing the optimal coagulant dosage of 100 mg/l is found to be able to reduce COD concentration by 34.74% and TSS concentration by 95.63% from the tested domestic wastewater sample. This research can illustrate the vast potential that the AMD sludge has as a coagulant.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Seismic risk for Sumbawa Island based on seismicity and peak ground acceleration

引用

IOP Conference Series: Earth and Environmental Science 2020年第1期413卷

作者： C B Santoso D S Agustawijaya Postgraduate Study Program in Civil Engineering Universitas Mataram Indonesia Department of Civil Engineering Universitas Mataram Indonesia

Sumbawa Island, West Nusa Tenggara Province, is one of the regions in Indonesia that has a relatively moderate to high seismic activity because the area is flanked by two earthquake sources. These two sources cause an area prone to earthquake hazards. This research aims to determine the seismic risk in Sumbawa Island based on seismicity and Peak Ground Acceleration (PGA) value. The results of Gutenberg-Richter parameters are a-value 7.43 and b-value 0.80 that indicated medium to high categories of seismicity. The PGA value of earthquake events is between 0.001g and 0.203g. The result of this analysis is shown within the probabilistic seismic hazard curve that indicates seismic risk level at Sumbawa Island.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Scheduling of House Development Projects with CPM and PERT Method for Time Efficiency (Case study: House Type 36)

引用

IOP Conference Series: Earth and Environmental Science 2018年第1期140卷

作者： Muhammad Kholil Bonitasari Nurul Alfa Madjumsyah Hariadi Industrial Engineering Study Program Faculty of Engineering Universitas Mercu Buana Jakarta Indonesia Civil Engineering Study Program Faculty of Engineering Universitas Mercu Buana Jakarta Indonesia

Network planning is one of the management techniques used to plan and control the implementation of a project, which shows the relationship between activities. The objective of this research is to arrange network planning on house construction project on CV. XYZ and to know the role of network planning in increasing the efficiency of time so that can be obtained the optimal project completion period. This research uses descriptive method, where the data collected by direct observation to the company, interview, and literature study. The result of this research is optimal time planning in project work. Based on the results of the research, it can be concluded that the use of the both methods in scheduling of house construction project gives very significant effect on the completion time of the project. The company's CPM (Critical Path Method) method can complete the project with 131 days, PERT (program Evaluation Review and Technique) Method takes 136 days. Based on PERT calculation obtained Z = -0.66 or 0,2546 (from normal distribution table), and also obtained the value of probability or probability is 74,54%. This means that the possibility of house construction project activities can be completed on time is high enough. While without using both methods the project completion time takes 173 days. So using the CPM method, the company can save time up to 42 days and has time efficiency by using network planning.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：