Bioleaching of Supergene Porphyry Copper Ores from Sungai Mak Gorontalo of Indonesia by an Iron- and Sulfur-Oxidizing Mixotrophic Bacterium

2017 ◽  
Vol 262 ◽  
pp. 20-23
Author(s):  
Siti Khodijah Chaerun ◽  
Frideni Yushandiana Putri ◽  
Mohammad Zaki Mubarok ◽  
Wahyudin Prawira Minwal ◽  
Zela Tanlega Ichlas
Keyword(s):  
Environmental Concern ◽  
Porphyry Copper ◽  
Environmentally Friendly ◽  
Mineralogical Composition ◽  
Extraction Process ◽  
Appropriate Technology ◽  
Copper Extraction ◽  
Sulfur Oxidizing ◽  
The Impact ◽  
Copper Ores

Environmentally friendly mining technologies have to be developed extensively to avoid the impact of mining activities with respect to environmental concern. One example of such technology is bioleaching which has been developed worldwide and is regarded as an appropriate technology for the extraction of metals from polymetallic ores such as supergene porphyry copper ores, mainly consisting of secondary copper sulfides, including chalcocite (Cu2S), covellite (CuS), or oxide minerals, i.e., cuprite (Cu2O) and tenorite (CuO). The extraction process for this complex ore generally requires high temperature, high pressure and/or high acid concentration. For the economic extraction of valuable copper from such ores, the bioleaching of supergene porphyry copper ore from Sungai Max in Southeast Sulawesi of Indonesia was investigated in shake-flask experiments at room temperature (28 °C) for 14 days using an iron- and sulfur-oxidizing bacterium (Alicyclobacillus sp.) indigenous to an Indonesian mine site. The main mineralogical composition of gangue minerals contained in this ore sample included quartz, muscovite, kaolinite and alunite. The relatively high copper extraction efficiencies were obtained over a 14-day period of the bioleaching experiments as a function of pH, pulp density and NaCl concentration. Therefore, the findings of this study provide the first information of bioleaching process of supergene porphyry copper ores in Indonesia that may highly be useful for developing an economical and environmentally friendly extraction process of such complex ores.

scholarly journals Attitude Formation Towards Local and International Ecological Face and Body Care Brands Among Lithuanian Female Consumers

2013 ◽  
Vol 4 (1) ◽  
pp. 23-42 ◽  
Author(s):  
Indrė Pikturnienė ◽  
Aistė Mackelaitė
Keyword(s):  
Environmental Concern ◽  
Environmentally Friendly ◽  
Consumer Attitude ◽  
Female Consumers ◽  
Intention To Purchase ◽  
Number Of Factors ◽  
Consumer Values ◽  
The One ◽  
Body Care ◽  
The Impact

Current environmental trends in production and marketing resulted in a close-loop situation, when on the one hand consumers demand environmentally friendly and ecological products and are ready to pay price premiums for them, on the other hand, marketers explore usage of environmentally friendly brands and labels as a competitive advantage. Both local and international brands compete in the market of ecological products. However, consumer propensity to purchase ecological brands differs, as this variable can be a function of a number of factors. The paper analyses the impact of consumer values, perceived environmental knowledge and pro-environmental concern on consumer attitudes towards ecological brands (local or international), and the influence of consumer attitude elements on intention to purchase local vs. foreign ecological brands in the industry of face and body care. Lithuanian women were polled to determine the relationship of these variables. The results indicate that the attitude towards an ecological product is related to the value of a sense of belonging and pro-environmental concern; intention to purchase a local brand is predicted by the attitude towards the local brand only, whereas intention to purchase an international brand is predicted by the attitude towards an international and ecological brand, and negatively correlates with the attitude towards a local brand.

Conceptualizing the impact of machines, science and technologies on the sociocultural environment that shapes the teacher's paradigm of values and views of life

2020 ◽  
Vol 16 (11) ◽  
pp. 2161-2179
Author(s):  
A.B. Lanchakov ◽  
S.A. Filin ◽  
A.Zh. Yakushev ◽  
E.E. Zhusipova
Keyword(s):  
Social Relationships ◽  
Cognitive Activity ◽  
Environmentally Friendly ◽  
Professional Activity ◽  
Sociocultural Environment ◽  
Sociocultural Development ◽  
Prediction And Forecasting ◽  
The Impact ◽  
Positive Motivation ◽  
The Way

Subject. In this article we analyze how machinery, science and technologies influence the sociocultural environment that engenders the teacher's paradigm of values and views of life. Objectives. We herein outline guidance to predict the way teachers' views of life might evolve in corresponding sociocultural periods more precisely. The article analyzes making more precise forecasts of oncoming economic crises, which will cause some changes in teachers' mindset. Methods. The study involves learning methodologies, methods of prediction and forecasting, including foresight. Results. We propose and analyze the theory holding that the human civilization passes cycles during its sociocultural development in terms of a new set of values in contemporary teachers' views of life. The article sets forth our recommendations on innovation-driven views of life, mindset and thinking and, consequently, the development of intellectual qualities, knowledge, skills, cognitive activity, positive motivation to the professional activity of a teacher and alumni during more elevated periods, which requires to more precisely predict the way teachers’ mindset may change in certain sociocultural periods. Conclusions and Relevance. As the human civilization enters the innovation-driven sociocultural period, teachers and social relationships should demonstrate more innovative and environmentally-friendly attitudes and views of life.

ACOUSTIC PANEL CHICKEN FEATHER WASTE ENVIRONMENTALLY FRIENDLY

2020 ◽  
Author(s):  
Ansarullah ◽  
Ramli Rahim ◽  
Baharuddin Hamzah ◽  
Asniawaty Kusno ◽  
Muhammad Tayeb
Keyword(s):  
Animal Feed ◽  
Environmentally Friendly ◽  
Selling Price ◽  
Chicken Feather ◽  
Chicken Feathers ◽  
The Road ◽  
Feather Waste ◽  
Chicken Feather Waste ◽  
Almost All ◽  
The Impact

Chicken feathers are the result of waste from slaughterhouses and billions ofkilograms of waste produced by various kinds of poultry processing. This hal is a veryserious problem for the environment because it causes the impact of pollution. Hasmany utilization of chicken feather waste such as making komocen, accessories,upholstery materials, making brackets to the manufacture of animal feed but from theresults of this activity cannot reduce the production of chicken feathers that hiscontinuously increase every year. This is due to the fact that the selling price of chickenmeat has been reached by consumers with middle to upper economic levels. This caneasily be a chicken menu in almost all restaurants and restaurants to the food stalls onthe side of the road. An alternative way of utilizing chicken feathers is to makecomposite materials in the form of panels. Recent studies have shown that the pvacmaterial can be utilized as a mixing and adhesive material with mashed or groundfeathered composites to form a panel that can later be used as an acoustic material.The test results show that the absorption of chicken feathers and pvac glue into panelscan absorb sound well with an absorption coefficient of 0.59, light. This result is veryeconomical so it is worth to be recommended as an acoustic material. Apart from theresults of research methods carried out is one of the environmentally friendly activitiesin particular the handling of waste problems

Sumber Energi Terbarukan dan Pupuk Organik dari Limbah Kotoran Sapi

2016 ◽  
Vol 16 (1) ◽  
pp. 191
Author(s):  
Mulyatun Mulyatun
Keyword(s):  
Community Service ◽  
Organic Fertilizer ◽  
Appropriate Technology ◽  
Cow Manure ◽  
Livestock Manure ◽  
Knowledge And Skills ◽  
Service Programs ◽  
The People ◽  
Community Service Programs ◽  
The Impact

<p>In order to meet households energy needs, one of the groundbreaking efforts that needs to be done is to implement appropriate technology training in utilization of cow manure waste by recycling it into biogas and organic fertilizer. Animal husbandry in Bambankerep Sub-District of Ngaliyan, Semarang City, are sufficiently developed, however, the use of livestock manure has not been optimal, whereas livestock manure can be used as raw material to produce renewable energy in the form of biogas and organic fertilizer. Furthermore, Limited knowledge and skills of the people in Bambankerep sub-district in the utilization of cow manure waste by recycling it into biogas and organic fertilizer have become the main problem. Steps performed in Community service programs are as follow (1) Socialization of recycling livestock waste into a blessing; (2) training, (3) Monitoring and outreaching. The impact generated from this community service programs, among others are: (1) raising public awareness in the utilization of cow manure waste for biogas alternative energy, (2) increasing knowledge and skills of people in processing cow manure into energy and fertilizer, (3) growing number of business groups in cow manure organic fertilizer processing that are expected can improve the welfare of the people in Bambankerep sub-district, Mijen, Semarang City.</p><p> </p><p>Dalam rangka pemenuhan keperluan energi rumah tangga, salah satu upaya terobosan yang perlu dilakukan adalah melaksanakan pelatihan teknologi tepat guna pemanfaatan limbah kotoran sapi menjadi biogas dan pupuk organik. Usaha peternakan di Kelurahan Bambankerep, Ngaliyan Semarang cukup berkembang, tapi pemanfaatan kotoran ternak selama ini belum optimal, padahal kotoran ternak dapat dijadikan sebagai bahan baku untuk menghasilkan energi terbarukan dalam bentuk biogas dan pupuk organik. Keterbatasannya pengetahuan dan keterampilan yang dimiliki masyarakat di Kelurahan Bambankerep mengolah limbah kotoran sapai menjadi biogas dan pupuk organik menjadi permasalahn utama. Tahapan program pengabdian masyarakat yang dilakukan adalah: (1) Sosialisai pemanfaatan limbah kotoran hewan menjadi berkah; (2) pelatihan; (3) Monitoring dan Pendampingan. Dampak yang dihasilkan dari program pengabdian masyarakat ini antara lain: (1) meningkatkan kesadaran masyarakat untuk memanfaatkan limbah kotoran sapi untuk energi alternatif biogas, (2) meningkatnya pengetahuan dan ketrampilan masyarakat bidang pengolahan kotoran sapi menjadi energi dan pupuk, (3) tumbuhnya kelompok usaha pengolahan pupuk organik dari kotoran sapi sehingga diharapkan dapat meningkatkan kesejahteraan masyarakat Kelurahan Bambankerep Ngaliyan Semarang.</p>

Effects of activated carbon on treatment of photo-processing waste by sulfur-oxidizing bacteria

1997 ◽  
Vol 35 (7) ◽  
pp. 187-195 ◽  
Author(s):  
Binle Lin ◽  
K. Futono ◽  
A. Yokoi ◽  
M. Hosomi ◽  
A. Murakami
Keyword(s):  
Activated Carbon ◽  
Treatment Effectiveness ◽  
Environmental Concern ◽  
Type Systems ◽  
Continuous Treatment ◽  
Processing Waste ◽  
Treatment Technology ◽  
Adsorption Effect ◽  
Sulfur Oxidizing ◽  
Sulfur Oxidizing Bacteria

Establishing economic treatment technology for safe disposal of photo-processing waste (PW) has most recently become an urgent environmental concern. This paper describes a new biological treatment process for PW using sulfur-oxidizing bacteria (SOB) in conjunction with activated carbon (AC). Batch-type acclimation and adsorption experiments using SOB/PAC, SOB/PNAC, and SOB reactor type systems demonstrated that AC effectively adsorbs the toxic/refractory compounds which inhibit thiosulfate oxidization of SOB in PW. Thus, to further clarify the effect of AC, we performed a long-term (≈ 160 d) continuous-treatment experiment on 4- to 8-times dilution of PW using a SOB/GAC system which simulated a typical wastewater treatment system based on an aerobic activated sludge process that primarily uses acclimated SOB. The thiosulfate load and hydraulic retention time (HRT) were fixed during treatment such that they ranged from 0.8-3.7 kg S2O32-/l/d and 7.7-1.9 d, respectively. As expected, continuous treatment led to breakthrough of the adsorption effect of GAC. Renewing the GAC and continuing treatment for about 10 d demonstrated good treatment effectiveness.

scholarly journals The Impact of the COVID-19 Pandemic on the Working Conditions, Employment, Career Development and Well-Being of Refugee Researchers

Societies ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 71
Author(s):  
Ourania Tzoraki ◽  
Svetlana Dimitrova ◽  
Marin Barzakov ◽  
Saad Yaseen ◽  
Vasilis Gavalas ◽  
...  
Keyword(s):  
Online Survey ◽  
Negative Impact ◽  
Well Being ◽  
Appropriate Technology ◽  
Public Authorities ◽  
Policy Makers ◽  
Home Setting ◽  
The Public ◽  
Work From Home ◽  
The Impact

The ongoing ‘refugee crisis’ of the past years has led to the migration of refugee researchers (RRs) to European countries. Due to the COVID-19 pandemic, RRs often had to work from home and/or to continue their social, cultural and economic integration process under new conditions. An online survey carried out to explore the impact of the pandemic on the refugee researchers showed that RRs found it difficult to adapt their everyday working life to the ‘home’ setting. The majority have had neither a suitable work environment at home nor the appropriate technology. Although they stated that they are rather pleased with the measures taken by the public authorities, they expressed concern about their vulnerability due to their precarious contracts and the bureaucratic asylum procedures, as the pandemic has had a negative impact on these major issues. The majority of RRs working in academia seem not to have been affected at all as far as their income is concerned, while the majority of those employed in other sectors became unemployed during the pandemic (58%). Recommendations are provided to the public authorities and policy makers to assist RRs to mitigate the consequences of the pandemic on their life.

scholarly journals An Evaluation of the Impact of the Amount of Potassium Hydroxide on the Porous Structure Development of Activated Carbons

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2045
Author(s):  
Mirosław Kwiatkowski ◽  
Elżbieta Broniek ◽  
Vanessa Fierro ◽  
Alain Celzard
Keyword(s):  
Density Functional Theory ◽  
Porous Structure ◽  
Potassium Hydroxide ◽  
Density Functional ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Appropriate Technology ◽  
Functional Theory ◽  
Homogeneous Surface ◽  
The Impact

This paper presents the results of an evaluation of the impact of the amount of potassium hydroxide on the obtained porous structure of the activated carbons derived from the shells of pistachios, hazelnuts, and pecans by carbonization and subsequent chemical activation with potassium hydroxide by different adsorption methods: Brunauer–Emmett–Teller, Dubinin–Raduskevich, the new numerical clustering-based adsorption analysis, Quenched Solid Density Functional Theory, and 2D-Non-linear Density Functional Theory for Heterogeneous Surfaces, applied to nitrogen adsorption isotherms at −196 °C. Based on the conducted research, a significant potential for the production of activated carbons from waste materials, such as nut shells, has been demonstrated. All the activated carbons obtained in the present study at the activator/char mass ratio R = 4 exhibited the most developed porous structure, and thus very good adsorption properties. However, activated carbons obtained from pecan shells deserve special attention, as they were characterized by the most homogeneous surface among all the samples analyzed, i.e., by a very desirable feature in most adsorption processes. The paper demonstrates the necessity of using different methods to analyze the porous structure of activated carbons in order to obtain a complete picture of the studied texture. This is because only a full spectrum of information allows for correctly selecting the appropriate technology and conditions for the production of activated carbons dedicated to specific industrial applications. As shown in this work, relying only on the simplest methods of adsorption isotherm analysis can lead to erroneous conclusions due to lack of complete information on the analyzed porous structure. This work thus also explains how and why the usual characterizations of the porous structure of activated carbons derived from lignocellulosic biomass should not be taken at face value. On the contrary, it is advisable to cross reference several models to get a precise idea of the adsorbent properties of these materials, and therefore to propose the most suitable production technology, as well as the conditions of the preparation process.

scholarly journals A comparative study on the extraction effects of common agents on collagen-based binders in mural paintings

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Jianghao Du ◽  
Zhanyun Zhu ◽  
Junchang Yang ◽  
Jia Wang ◽  
Xiaotong Jiang
Keyword(s):  
Protein Structure ◽  
Comparative Study ◽  
Protein Extraction ◽  
Guanidine Hydrochloride ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Extraction Process ◽  
Ultraviolet Absorption Spectrum ◽  
Mural Paintings ◽  
The Impact

AbstractIn this paper, a comparative study was conducted on the extraction effects of six agents for collagen-based mural painting binders. These agents were used to extract the residual proteins in the non-aged and thermal aged samples. The protein extraction efficiencies of different extracting agents were quantitatively determined by bicinchoninic acid (BCA) method, and then processed by multivariate analysis of variance (MANOVA). The impact of the extraction process on the protein structure was characterized by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), ultraviolet absorption spectrum (UV) and circular dichroism (CD). The results showed that, for both non-aged and aged samples, the extraction efficiency of 2 M guanidine hydrochloride (GuHCl) was significantly higher than the other five agents, with less damage to the protein structure during the extraction process.

scholarly journals Application and Development of an Environmentally Friendly Blast Hole Plug for Underground Coal Mines

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Donghui Yang ◽  
Yixin Zhao ◽  
Zhangxuan Ning ◽  
Zhaoheng Lv ◽  
Huafeng Luo
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Low Cost ◽  
Blast Hole ◽  
Environmentally Friendly ◽  
Test System ◽  
Industrial Test ◽  
Labor Intensity ◽  
Rock Blasting ◽  
Hopkinson Pressure Bar ◽  
The Impact

Drilling and blasting technology is one of the main methods for pressure relief in deep mining. The traditional method for blasting hole blockage with clay stemming has many problems, which include a large volume of transportation, excess loading time, and high labor intensity. An environmentally friendly blast hole plug was designed and developed. This method is cheap, closely blocks the hole, is quickly loaded, and is convenient for transportation. The impact test on the plug was carried out using an improved split Hopkinson pressure bar test system, and the industrial test was carried out in underground tunnel of coal mine. The tests results showed that, compared with clay stemming, the new method proposed in this paper could prolong the action time of the detonation gas, prevent premature detonation gas emissions, reduce the unit consumption of explosives, improve the utilization ratio, reduce the labor intensity of workers, and improve the effect of rock blasting with low cost of rock breaking.

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