scholarly journals PHOTOBIOREACTOR FOR MICROALGAE-BASED WASTEWATER TREATMENT

2021 ◽  
Vol 87 (2) ◽  
pp. 57-64
Author(s):  
Lesia Pavliukh ◽  
Sergii Shamanskyi
Keyword(s):  
Wastewater Treatment ◽  
Sewage Water ◽  
Theoretical Research ◽  
Scientific Article ◽  
Labor Costs ◽  
Systematic Analysis ◽  
Comparison Research ◽  
Biogenic Compounds ◽  
Photobioreactor Design ◽  
Made In

Purpose and Objectives of the Work. This scientific article is devoted to creation of an advanced photobioreactor design for wastewater treatment from biogenic compounds.  Research Methods are based on a systematic analysis of theoretical research, synthesis, anology and comparison. Research Results. As a result, the improved photobioreactor design was proposed, in which the application of new elements and connections reduces the required area for its placement, immobilization of microalgae in the working area and, as a result, reducing the working area, the ability to quickly replace the sleeves of the working area, covered with sediment inside, and, as a result, reduce labor costs and downtime of the photobioreactor. Discussion. The problem is solved by the fact that the photobioreactor is made in the form of a transparent flowing rectangular open-topped tank, inside of which are vertically attached to the bottom of the tank by quick-release fasteners transparent flowing flexible hoses, to which at the bottom by means of non-return valves are connected pipelines for wastewater and microalgae supply and tubes for carbon dioxide supply and are connected by means of shut-off valves pipelines for drainage of a mixture of microalgae with residual wastewater, and in the upper hermetic part, where there are valves for drainage of accumulated gases , while the  pipeline for the purified wastewater discharge is connected to a guide tray purified wastewater supply inside of a flowing rectangular open-topped tank, and at the outlet of the pipeline for drainage of a mixture of microalgae with residual wastewater is a microalgae separator to separate return and excess biomass. Conclusion. The proposed construction of photobioreactor can have good perspectives to be use in communal services for sewage water purification from biogenic compounds.

scholarly journals The Tail Wagging the Dog (or the Challenges Faced When the Financing of Medicine Gets Ahead of the Science of Medicine)

2018 ◽  
Vol 56 (10) ◽  
Author(s):  
David W. Kimberlin
Keyword(s):  
Case Series ◽  
Molecular Testing ◽  
Labor Costs ◽  
Specific Test ◽  
Potential Harm ◽  
Viral Culture ◽  
Diagnostic Decision ◽  
Simplex Virus ◽  
Diagnostic Decision Making ◽  
Made In

ABSTRACTIn their article in this issue of theJournal of Clinical Microbiology, S. R. Dominguez et al. (J Clin Microbiol 56:e00632-18, 2018,https://doi.org/10.1128/JCM.00632-18) describe the performance of PCR detection of herpes simplex virus (HSV) DNA versus viral culture in skin and mucosal samples from 7 neonates with HSV disease. This is a significant contribution to our understanding of the optimal diagnostic approach in babies being evaluated for neonatal HSV disease. Many diagnostic laboratories already have made the change to molecular diagnostics for skin and mucosal swab testing, however, in large part due to the labor costs associated with viral cultures. Thus, important studies such as this one are being conducted to support a decision that has already been made in many locations on mostly economic grounds. This small case series supports the decision to use molecular testing for samples from skin and mucosal sites, but larger studies are needed to more fully define the performance characteristics of PCR in this population. Since a false-positive result would commit a baby to months of management that would be unnecessary and have potential harm, it is critical to base diagnostic decision making on data that support the use of a specific test.

scholarly journals Bioelectricity production from tofu wastewater using microbial fuel cells with microalgae Spirulina sp as catholyte

2020 ◽  
Vol 202 ◽  
pp. 08007
Author(s):  
Wahyu Zuli Pratiwi ◽  
Hadiyanto Hadiyanto ◽  
Purwanto Purwanto ◽  
Muthi’ah Nur Fadlilah
Keyword(s):  
Wastewater Treatment ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Organic Waste ◽  
Oxygen Demand ◽  
Salt Bridge ◽  
Cod Removal ◽  
Biofuel Production ◽  
Pre Treatment ◽  
Made In

Microalgae-Microbial Fuel Cells (MMFCs) are very popular to be used to treat organic waste. MMFCs can function as an energy-producing wastewater pre-treatment system. Wastewater can provide an adequate supply of nutrients, support the large capacity of biofuel production, and can be integrated with existing wastewater treatment infrastructure. The reduced content of Chemical Oxygen Demand (COD) is one way to measure the efficiency of wastewater treatment. MMFCs reactors are made in the form of two chambers (anode and cathode) both of which are connected by a salt bridge. Tofu wastewater as an anode and Spirulina sp as a cathode. To improve MFCs performance which is to obtain maximum COD removal and electricity generation, nutrient NaHCO3 as the nutrient carbon source for Spirulina sp was varied. The system running phase on 12 days. The results were Spirulina sp treated with MFCs technology has better growth than non-MFCs. The MMFC generated a maximum power density of 21.728 mW/cm2 and achieved 57.37% COD removal. These results showed that the combined process was effective in treating tofu wastewater.

scholarly journals Identification of duration construction of combined foundation

2018 ◽  
Vol 5 (4) ◽  
Author(s):  
Iakov Pronozin ◽  
Denis Volosiuk
Keyword(s):  
Labor Costs ◽  
Work Time ◽  
Common Time ◽  
Actual Duration ◽  
Concrete Mix ◽  
Time Standards ◽  
Time Parameters ◽  
Working Out ◽  
Sufficient Precision ◽  
Made In

The method for determining the duration of a combined foundation device, which is constructed in several stages, is considered in the article. The main stages include the construction of structures and the regulation of the stress-strain state of the soil base, which is carried out by pressing it. Pressurization is carried out during the construction of the building. On an example of construction of the linear schedule the mutual coordination of works of each stage during building of a building is resulted. The possibility of varying the time parameters of the network model is presented depending on the parameters of the crimping process. Between the late and early beginnings of work there is a common time reserve, which is part of the technological break. The authors present empirical data on the actual duration of concreting of grillage of combined foundations. The study of time parameters of technological processes was based on such methods of observation as timekeeping, photo-timing and video and photo-fixation. The measurements were carried out during the construction of the residential complex «Neighbors» in Tyumen. The scope of research included the study of labor costs of the team, consisting of seven concrete workers. The investigated technological process of concreting consistently included the reception and direction of the concrete mix, laying, leveling and compacting the mixture, smoothing and smoothing the grillage surface. Based on the data obtained, the dependencies of the average duration of concrete work on the volume of the concrete mix laid in the cells (shells) are revealed. The comparison of work durations on both foundations is made. Actual work is determined and work time standards are established, allowing to organize concrete works with sufficient precision when drawing up calendar plans within the framework of working out of projects for the production of works. This article is made in the framework of the dissertation research by co-author Volosiuk D.V.

scholarly journals Mathematical Modeling and Data Analysis of Nmr Experiments Using Hyperpolarized 13C Metabolites

2013 ◽  
Vol 6 ◽  
pp. MRI.S11084 ◽  
Author(s):  
Guilhem Pagès ◽  
Philip W. Kuchel
Keyword(s):  
Nuclear Polarization ◽  
Magnetic Field Gradient ◽  
Pulse Sequences ◽  
Rapid Imaging ◽  
Rf Pulses ◽  
Systematic Analysis ◽  
Hyperpolarized 13C ◽  
Rapid Dissolution ◽  
Made In ◽  
Critical Aspects

Rapid-dissolution dynamic nuclear polarization (DNP) has made significant impact in the characterization and understanding of metabolism that occurs on the sub-minute timescale in several diseases. While significant efforts have been made in developing applications, and in designing rapid-imaging radiofrequency (RF) and magnetic field gradient pulse sequences, very few groups have worked on implementing realistic mathematical/kinetic/relaxation models to fit the emergent data. The critical aspects to consider when modeling DNP experiments depend on both nuclear magnetic resonance (NMR) and (bio)chemical kinetics. The former constraints are due to the relaxation of the NMR signal and the application of ‘read’ RF pulses, while the kinetic constraints include the total amount of each molecular species present. We describe the model-design strategy we have used to fit and interpret our DNP results. To our knowledge, this is the first report on a systematic analysis of DNP data.

scholarly journals Study of Physico-Chemical Characteristics of Wastewater in an Urban Agglomeration in Romania

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Paula Popa ◽  
Mihaela Timofti ◽  
Mirela Voiculescu ◽  
Silvia Dragan ◽  
Catalin Trif ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Correlation Analysis ◽  
Inorganic Compounds ◽  
Chemical Characteristics ◽  
Spectrophotometric Methods ◽  
Physico Chemical ◽  
Wastewater Pollution ◽  
Biogenic Compounds

This study investigates the level of wastewater pollution by analyzing its chemical characteristics at five wastewater collectors. Samples are collected before they discharge into the Danube during a monitoring campaign of two weeks. Organic and inorganic compounds, heavy metals, and biogenic compounds have been analyzed using potentiometric and spectrophotometric methods. Experimental results show that the quality of wastewater varies from site to site and it greatly depends on the origin of the wastewater. Correlation analysis was used in order to identify possible relationships between concentrations of various analyzed parameters, which could be used in selecting the appropriate method for wastewater treatment to be implemented at wastewater plants.

Nanofiltration technology in water treatment and reuse: applications and costs

2015 ◽  
Vol 71 (3) ◽  
pp. 309-319 ◽  
Author(s):  
Arash Shahmansouri ◽  
Christopher Bellona
Keyword(s):  
Wastewater Treatment ◽  
Cost Estimation ◽  
Water Reuse ◽  
Large Scale ◽  
Industrial Applications ◽  
Estimation Methods ◽  
Seawater Desalination ◽  
Labor Costs ◽  
Water And Wastewater Treatment ◽  
Water And Wastewater

Nanofiltration (NF) is a relatively recent development in membrane technology with characteristics that fall between ultrafiltration and reverse osmosis (RO). While RO membranes dominate the seawater desalination industry, NF is employed in a variety of water and wastewater treatment and industrial applications for the selective removal of ions and organic substances, as well as certain niche seawater desalination applications. The purpose of this study was to review the application of NF membranes in the water and wastewater industry including water softening and color removal, industrial wastewater treatment, water reuse, and desalination. Basic economic analyses were also performed to compare the profitability of using NF membranes over alternative processes. Although any detailed cost estimation is hampered by some uncertainty (e.g. applicability of estimation methods to large-scale systems, labor costs in different areas of the world), NF was found to be a cost-effective technology for certain investigated applications. The selection of NF over other treatment technologies, however, is dependent on several factors including pretreatment requirements, influent water quality, treatment facility capacity, and treatment goals.

Middlemen in Third-World Corruption: Implications of an Indian Case

1987 ◽  
Vol 39 (4) ◽  
pp. 508-535 ◽  
Author(s):  
Philip Oldenburg
Keyword(s):  
Third World ◽  
Political Change ◽  
Systematic Analysis ◽  
The Third ◽  
1960S And 1970S ◽  
The 1960S ◽  
The Third World ◽  
Made In

Corruption—like the weather—is a phenomenon people in the third world talk about a great deal, and, it would seem, do little about. Scholars of political change in the third world share this interest, but—although they are usually not expected to deal with corruption itself —they should move beyond the recounting of vivid anecdotes to a more systematic analysis of the problem. Steps in this direction were made in the 1960s and 1970s, but surprisingly little more work has been done since.

French Experimental Work on All-Weather Landing

1964 ◽  
Vol 17 (3) ◽  
pp. 262-265
Author(s):  
J. Villiers
Keyword(s):  
Experimental Work ◽  
Practical Work ◽  
Air Transport ◽  
Theoretical Research ◽  
Experimental Unit ◽  
Considerable Body ◽  
Made In

During 1960 the French civil and military authorities decided to coordinate their efforts and to step up the programme of research and practical tests on landing in poor visibility. They felt that they could best contribute to the development of air transport in this vital field by adding their own vigorous and intensive efforts to the considerable body of work already undertaken by other countries. Numerous automatic landings had already been made in the U.S.A., and the British Blind Landing Experimental Unit had made several thousand. Yet, in spite of the results obtained, many problems still remained unsolved and many questions unanswered. There was evidently still room for much more practical work and theoretical research.

scholarly journals Czy idea tak zwanej wtórnej legalności się broni?

2017 ◽  
Vol 43 ◽  
pp. 401-420
Author(s):  
Jarosław Majewski
Keyword(s):  
Legal Culture ◽  
Social Benefits ◽  
Final Conclusion ◽  
Systematic Analysis ◽  
Legal Norms ◽  
Basic Assumptions ◽  
The Social ◽  
The Law ◽  
The One ◽  
Made In

Is the idea of so-called “secondary legality” defensible?The aim of the study is critical analysis of the idea of so-called “secondary legality” of an act used by some jurists to explain types of behaviour falling into the category of circumstances excluding lawlessness of an act justification, namely to define the relation between such types of behaviour and the legal system as a whole, and the various sanctioned norms that are part of the system. First, the author examines the relation between the assumption that a type of behaviour which falls within the category of circumstances excluding lawlessness of an act constitutes a legal transgression of the sanctioned norm, and the basic assumptions made in the Polish legal culture concerning the process of creation and application of the law as well as its systematic analysis. He demonstrates that consistent use of the secondary legality category would require a considerable remodelling of these assumptions, above all, rejection of the assumption that legal norms are introduced to be met as well as all consequences stemming from this assumption as well as abandonment of the approach to the law as a set of legal norms that is internally cohesive. Next, the author analyses the internal aspects of the idea of secondary legality of an act. He demonstrates that it encompasses contradictory statements: on the one hand that justifi able behaviour constitutes socially harmful, negative and thus a typical attack on legal interest, and on the other hand that the social benefits ultimately outweigh losses in the case of justifiable behaviour. All the above justifies the author’s final conclusion that the category of secondary legality of an act is not useful.

scholarly journals THE METHOD PROBLEM IN THE CONTEXT OF PSYCHOLOGICAL KNOWLEDGE INTEGRATION

2020 ◽  
Vol 116 (5) ◽  
pp. 100-109
Author(s):  
Vladislav A. Medintsev ◽  
Keyword(s):  
Research Methods ◽  
Knowledge Integration ◽  
Theoretical Research ◽  
Universal Method ◽  
Systematic Analysis ◽  
Psychological Science ◽  
Method Integration ◽  
Integration Problem ◽  
Psychological Knowledge ◽  
Theoretical Foundations

In psychological science, the «method problem» remains one of the most fundamental and relevant, and a new content shade of this problem is associated with the activation of discussion on the psychological knowledge integration. In this context, the problem acquires an updated content as a problem of a universal method in psychology. There is a reason to believe that the «method problem» is transformed into the «universal method problem» and then into the «universal method integration problem». The efforts to solve these problems are often depreciated due to the ignorance of experimenting and practicing psychologists by methodological knowledge. The possible way to build a universal method for theoretical research in psychology is to use for this purpose a procedural interpretation of theorizing based on set-theoretic process description method. In the article components of theoretical research are considered as the purpose, object, subject, hypothesis of the research, as well as the considered empiricism, theoretical foundations, method of theorizing and research tasks. Two methodological «poles» of theoretical research are identified – the «normative» method and modern research methods, and a variant of analyzing their structures is proposed. To create a universal method suitable for psychological knowledge integration is associated with obstacles, which can be overcome by their systematic analysis. The article outlines a variant of this analysis, in which the causes and sources of these obstacles are differentiated based on the system of concepts used for describing processes. The sources of integration obstacles include components of prototype modi, and the causes are properties of modi functions in the recording of processes as maps of sets. The examples describe the integration obstacles at the two levels of interactions.

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