Indonesian Journal of Science and Technology最新文献_第8页

A Review on Rotating Biological Contactors 旋转生物接触器研究进展

Indonesian Journal of Science and Technology Pub Date : 2019-07-09 DOI: 10.17509/IJOST.V4I2.18181

Sharjeel Waqas, M. Bilad

{"title":"A Review on Rotating Biological Contactors","authors":"Sharjeel Waqas, M. Bilad","doi":"10.17509/IJOST.V4I2.18181","DOIUrl":"https://doi.org/10.17509/IJOST.V4I2.18181","url":null,"abstract":"Rotating biological contactors (RBC) is a wastewater treatment process that provides a both acceptable effluent quality and organic removal efficiency at a comparatively very low costs. It is highly attractive due to simplicity of operation, low sludge production, small foot-print, low maintenance, and low operational cost. Complete nitrification/denitrification can be achieved by varying the disk submergence level and operating the process under both anaerobic/anoxic conditions in a single unit. In this review, pros and cons of RBC are discussed in detail along with the factors affecting its performances. Organic and hydraulic loading and hydraulic retention time are the main parameters followed by additional parameters such as rotational speed, media, disk submergence, dissolved oxygen level, influent and effluent characteristics, and step-feeding in affecting the performance of an RBC system. RBC has shown promising results for the removal of biodegradable matter, nitrogen and phosphorous removal. The approaches for hybridization of biological processes to improve their overall performance are also review. Such success story is assess so explore possibility of developing RBC based hybrid processes. Hybrid RBC can be form from in-combination with other processes for minimizing energy requirements and maximizing the efficiency of the system.","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75360631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

Investigation of the Adequacy of Bridge Design Loads in Pakistan 巴基斯坦桥梁设计荷载充分性调查

Indonesian Journal of Science and Technology Pub Date : 2019-07-09 DOI: 10.17509/IJOST.V4I2.18174

I. Shahid, A. Noman, S. Farooq, A. Arshad

{"title":"Investigation of the Adequacy of Bridge Design Loads in Pakistan","authors":"I. Shahid, A. Noman, S. Farooq, A. Arshad","doi":"10.17509/IJOST.V4I2.18174","DOIUrl":"https://doi.org/10.17509/IJOST.V4I2.18174","url":null,"abstract":"Weight, configuration, and volume of traffic vary from country to country. But, in developing countries like Pakistan, bridges are designed based on codes of developed countries. Hence, these bridges may not have desired safety level. In this study, safety levels of three sample bridges has been investigated in terms of structural reliability index. Live load effects (shear and moments) in girders were determined using weigh-in-motion data (WIM) and were extrapolated to 75 years using non-parametric fit. Two live load models and two strengths, required by 1967 Pakistan Code of Practice for Highway Bridges (PHB Design-Case) and that required by the 2012 AASHTO LRFD Bridge Design Specifications (AASHTO Design-Case) were used in reliability analysis. It is found that actual trucks produce moment and shear in girders 11 to 45 percent higher than live load models of PHB and AASHTO design cases. Values of structural reliability indices vary from 1.25 to 2.50 and from 2.45 to 3.15 for PHB and AASHTO design cases, respectively, and are less than the target reliability index value of 3.50 used in the design codes as benchmark. It is revealed after the research that bridges in Pakistan may not have desired safety level, and current live load models may not be the true representation of service-level truck traffic.","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86315076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Traceable Value for Proficiency Test of Natural Gas 天然气能力测试的可追溯值

Indonesian Journal of Science and Technology Pub Date : 2019-07-09 DOI: 10.17509/IJOST.V4I2.18184

Y. S. Ridwan, S. Supriadi, W. Nugraha

引用次数: 2

The Effect of Particle Dispersion due to Mixing Speed on Spent Coffee Ground Composites 混合速度对废咖啡粉复合材料颗粒分散的影响

Indonesian Journal of Science and Technology Pub Date : 2019-07-09 DOI: 10.17509/IJOST.V4I2.18175

Sumarji Sumarji, Fabrobi Ridha, Dedi Dwilaksana, A. Syuhri, Raihaan Raihaan

引用次数: 3

Removal of Methylene Blue by Adsorption onto Activated Carbon From Coconut Shell (Cocous Nucifera L.) 活性炭吸附去除椰子壳亚甲基蓝的研究

Indonesian Journal of Science and Technology Pub Date : 2019-07-09 DOI: 10.17509/IJOST.V4I2.18179

Rifki Husnul Khuluk, A. Rahmat, B. Buhani, S. Suharso

{"title":"Removal of Methylene Blue by Adsorption onto Activated Carbon From Coconut Shell (Cocous Nucifera L.)","authors":"Rifki Husnul Khuluk, A. Rahmat, B. Buhani, S. Suharso","doi":"10.17509/IJOST.V4I2.18179","DOIUrl":"https://doi.org/10.17509/IJOST.V4I2.18179","url":null,"abstract":"This research has been conducted on process of production activated carbon from coconut shells, which are activated both physics and chemistry to improve the adsorption of methylene blue. The process of physical activation was done by burning the coconut shell using a furnace at a temperature of 700°C. The chemical activation was done using H3PO4 activator. The result of activated carbon physical activation (CAP) has a greater absorbency than activated carbon chemical activation (CAC) with each of the absorption of methylene blue at 99.42 and 98.64%. Analysis of surface morphology on the adsorbent was performed using a Scanning Electron Microscope (SEM). SEM results indicated that (CAP) has a surface morphology that is relatively similar to commercial activated carbon (CACm). Adsorption test was conducted on the determination of the optimum pH, adsorption rate, and isotherm adsorption of methylene blue. The results of the optimum pH on CAC, CAP, and CACm respectively obtained at pH 8 and the optimum contact time is obtained respectively at 40, 60, and 80 minutes. Adsorption kinetics data of methylene blue on CACm, CAP, and CAC tend to follow the pseudo second order kinetics with a correlation coefficient (R2) is 0.937; 0.950; and 0.999, respectively. Adsorption isotherm of methylene blue on CACm, CAP, and CAC tend to follow the model of Freundlich isotherms.","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90624046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

A Design Model of Special Vocational High School for Children with Visual Impairment 视觉障碍儿童特殊职业高中的设计模式

Indonesian Journal of Science and Technology Pub Date : 2019-07-09 DOI: 10.17509/IJOST.V4I2.18173

J. Maknun, M. Barliana, D. Cahyani

引用次数: 4

Isolation and Identification of Hydrocarbon Degradation Bacteria and Phosphate Solubilizing Bacteria in Oil Contaminated Soil in Bojonegoro, East Java, Indonesia 印尼东爪哇Bojonegoro石油污染土壤中烃类降解细菌和磷酸盐增溶细菌的分离鉴定

Indonesian Journal of Science and Technology Pub Date : 2019-03-07 DOI: 10.17509/IJOST.V4I1.14923

Y. Rahayu

{"title":"Isolation and Identification of Hydrocarbon Degradation Bacteria and Phosphate Solubilizing Bacteria in Oil Contaminated Soil in Bojonegoro, East Java, Indonesia","authors":"Y. Rahayu","doi":"10.17509/IJOST.V4I1.14923","DOIUrl":"https://doi.org/10.17509/IJOST.V4I1.14923","url":null,"abstract":"Petroleum is a mixture of hydrocarbon complexes with organic compounds from sulfur, oxygen, nitrogen and metal-containing compounds. These organic compounds can be used as substrate for bacterial growth. This study aimed to isolate and identify hydrocarbon degrading bacteria and phosphate solubilizing bacteria in oil-contaminated soil in Bojonegoro. This study used an exploration method to find each of the two types of hydrocarbon degrading bacteria and phosphate solubilizing bacteria from soil samples in Bojonegoro that contaminated by oil. Identification of isolates bacterial included macroscopic observations of bacteria, gram staining on bacterial cells and physiological tests. Macroscopic observations include the form of colonies, colony diameter, colony color, colony edge, and elevation. The physiological test using Microbact Identification System to determine the physiological characteristics of bacteria so that genera and types of bacteria can be known. The identification of organisms was based on changes in pH and use of the substrate. The results of data analysis were obtained from five types of bacteria from soil samples that contaminated by oil which were successfully isolated. After identification of species was done, four species of bacteria were obtained, namely Pseudomonas pseudomallei, Pseudomonas fluorescens-25, Flavobacterium odoratum, and Enterococcus sp.","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86687749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Experimental Investigation on Mechanical Joint of Lontar (Borassus Flabellifer) Fiber Reinforced Polyester Composites under Static Flexural Test Lontar (Borassus Flabellifer)纤维增强聚酯复合材料力学接头静态弯曲试验研究

Indonesian Journal of Science and Technology Pub Date : 2019-03-07 DOI: 10.17509/IJOST.V4I1.15239

J. Bale, Yeremias Pell, Muhamad Jafri, Rima N Selan

引用次数: 2

Phytochemical screening of Sargassum sp and in vitro seed germination test 马尾藻的植物化学筛选及离体种子萌发试验

Indonesian Journal of Science and Technology Pub Date : 2019-03-07 DOI: 10.17509/IJOST.V4I1.11141

Siti Fatimah Baharudin, H. Alimon, N. Daud

引用次数: 2

The Effect of Education Level on Accepting The Reuse of Treated Effluent in Irrigation 文化程度对接受灌溉废水回用的影响

Indonesian Journal of Science and Technology Pub Date : 2019-03-07 DOI: 10.17509/IJOST.V4I1.14881

H. Al-Najar, Basel El Hamarneh

{"title":"The Effect of Education Level on Accepting The Reuse of Treated Effluent in Irrigation","authors":"H. Al-Najar, Basel El Hamarneh","doi":"10.17509/IJOST.V4I1.14881","DOIUrl":"https://doi.org/10.17509/IJOST.V4I1.14881","url":null,"abstract":"Gaza strip suffers from a serious shortage in water resources due to the continuous increase in population, life changes, political conditions and drought caused by climate change. Due to increased demand for water for domestic use, resulting accumulation of large quantities of wastewater in the treatment plant in Rafah. Therefore, reuse of treated wastewater is one of the most recently accepted approaches to save groundwater or domestic use. The aim of this research is to study the treated effluent quality from Rafah Treatment Plant, in addition to the effect of education level of the farmers on reusing treated wastewater for irrigation. A questionnaire was distributed to farmers to investigate the acceptance of using treated effluent for irrigation, meanwhile the effluent parameters tested were BOD, COD, TKN, NH4, NO3, P, Cd, Pb, and Cu accounted for 110, 250, 108, 127, 0.23, 17.9 mg/l, < 0.003, <0.001, and 19.9 µg/l. Most of reuse parameters were higher than the recommended levels for the effluent reuse based on the recommended Palestinian Standards for irrigation. About 80.7% of farmers accept using treated wastewater in irrigation and the Chi-square test analysis showed that, at P-value =0.00095 < α= 0.05, there is a close relationship between the educational level of farmers and the acceptance of using of treated wastewater in irrigation, as long as it is safe and healthy. ","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"338 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77599281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8