bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exploring the Effect of Specific Bacterial Strains on the Degradation and Production of Volatile Fatty Acids from Food Waste Leachate
Authors: Pham Van HT , Chang SW 
Published: February 2020

Abstract
Waste stream has well known as a best option for biorefinery process as it effectively mitigates the organic amount to produces biogas as a renewable and an alterative energy. Volatile Fatty Acids (VFAs) are huge valuable sources for the chemical industry as the precursors of reduced chemicals and derivatives. On the other hand, they have well known as the substrates for bio-fuel production like methane and hydrogen. Thus, the aim of this study is to isolate a pure specific bacterial strains from a variety of sources such as soil, wastewater and food waste leachate that play a crucial role in VFAs degradation and production. In this study, twenty bacterial strains isolated from soil and waste samples were tested in presence of VFAs components concluding acetic acid, butyric acid and propionic acid at 35 °C in four periods: 1-day, 5-day, 10-day and 15-day incubations. Consequently, eight strains illustrated strong growth in the mineral salt media containing VFAs components after 15 days. Four strains out of eight have been found as producing VFAs bacterial candidates. These strains later were tested back in the Food Waste Leachate as a substrate for carbon and energy sources at the same operational conditions. Moreover, there are other four strains which have been explored from the other group chosen for an examination of VFA degradation. After determining potential VFAs consuming and producing candidates, a consortium has been screening for accelerating and optimizing the gas production in the next study at variety of operation conditions.
Study and Practice on Pollution Control of Rain and Sewage Overflow in Old Urban Area -- Taking the Yangluo Old Urban Areas in Wuhan as an Example
Authors: He Shufang , Jia Baojie , Liu YeShuang , Huang Zhuo 
Published: February 2020

Abstract
In view of the pollution problem of rain and sewage overflow in old urban area, the pollution characteristics and the pollution load are calculated and analysed, and then it is proposed that the initial rainwater storage technology be used to deal with the rainwater and sewage overflow. Based on the rainfall datas of years in Wuhan, and balance rainfall field controlling rate, annual runoff controlling rate and storage area to determine the initial rainfall storage standard. Then, the benefits of storage and disposal are forecasted. Finally, suggestions for further solving the problem of rain and sewage overflow pollution in the old city are put forward.
Utilisation of secondary raw materials for production of artificial soils substrate
Authors: Dlabaja M 
Published: February 2020

Abstract
A large number of secondary raw materials arise from industrial production. It is necessary to find a way for the use of these materials not utilisable for the primary production, for example, to adjust physically-mechanical and chemical properties in order to manufacture the artificial soil substrate for reclamation of those areas which are affected by industrial activities. Then the whole cycle is finally closed. My focus is on the adaptation and utilisation of secondary raw materials. This raw material arises from the treatment of industrial water during cellulose production. The raw material is adapted and utilised by using by-energy products and excavation of soils. We created a special production process for this purpose. We included semi-mobile technological production line that allows for qualitative entry change with the use of physically-mechanical processes, in order to create a certificated reclamation mixture according to specific formulas.
Constructions used to enable fish migration in the Czech Republic and abroad
Authors: Dvorsky T , Vaclavik V 
Published: February 2020

Abstract
This publication deals with the migration permeability of watercourses in the Czech Republic and in the world from the point of view of the constructions enabling this migration. The goal of this article is to compare the situation of fish ladders in the individual continents with the situation in the Czech Republic. It is clear that the area of migration permeability of watercourses was only a marginal topic worldwide, but this sphere of water management has recently gained increasing importance.
Water quality comparison for various drainage systems for 2000 equivalent population
Authors: Hlustik P , Raclavsky J 
Published: February 2020

Abstract
The article deals with the comparison of wastewater quality in gravity and alternative drainage systems. The gravity drainage systems include combined and sanitary sewerage systems, the alternative systems encompass pressure and vacuum sewerage systems. The difference in the quality of wastewater conveyed to a wastewater treatment plant is influenced by the relevant sewerage system, its technical condition and regular maintenance. The objective of the article is to highlight the differences in wastewater quality with respect to BOD, COD, SS, NH4, Nt and Pct indicators based on the chemical analyzes conducted over several years of operation. The comparison is made for selected municipalities in the Czech Republic in 2005-2019 for various sewerage systems.
Hard coal flotation depending on the degree of oxidation of the particle surface
Authors: Kolacek J , Zavada J 
Published: February 2020

Abstract
The paper deals with the problem of floatability of coal with different degree of surface oxidation. It was found that coal floatability decreases with increasing degree of oxidation of its surface. In order to improve the flotation of the oxidized coal sample, mineral motor oil was used as a non-polar collector and oleic acid as a surfactant. Flotation tests showed a significant increase in the floatability of the oxidized coal sample after the addition of oleic acid and the close relationship between the degree of oxidation of the coal surface and the proportion of oleic acid as a collector.
Contribution to the study of selected heavy metals in urban wastewaters using ICP-MS method
Authors: Kotalova I , Calabkova K , Drabinova S , Heviankova S 
Published: February 2020

Abstract
Heavy metals pose a significant risk to all environmental elements and human health. The danger lies in the fact that they can be toxic even at low concentrations. For this reason, inductively coupled plasma mass spectrometry (ICP-MS) was chosen from all available methods to monitor the concentration of selected heavy metals. In comparison with other methods, very low concentrations of monitored substances (in μg/l) can be determined by ICP-MS.
This paper deals with the monitoring of the concentration of selected heavy metals at the inlet and outlet of the municipal wastewater treatment plant, namely lead, cadmium and nickel. The results show that the purification process has a positive effect on the reduction of the concentration of heavy metals in wastewater.
Water management development trends in the 21st century
Authors: Krocova S , Pokorny J 
Published: February 2020

Abstract
To ensure the long-term sustainability of each technical infrastructure it is necessary to know the alternative development trends in the raw material base and the technical development of the systems in questions. The findings are valid for non-renewable sources. Even these renewable sources of raw materials and water can have a very significant capacity differences in different time periods. One of the causes of unevenness in the aquatic ecosystem abundance in the world is today’s ongoing global climate change. It raises already among other things, the considerable movements of the population from the affected territories and the trend which will be probably potentiate. The following article is the basic scope of this issue and indicates the ways in which to recognise the treat in a timely manner and the use appropriately chosen methods to minimise its effects to an acceptable level.
Analysis of the recent state of sewage network in Serbia
Authors: Marko I , Csicsaiova R , Stanko S , Skultetyova I , Hrudka J 
Published: February 2020

Abstract
Serbia is among the countries with the lowest percentage of industrial and municipal wastewater treatment plants. Approximately 72.0% of the cities have a sewerage system, while only 60.0% of the population are connected to the sewerage network. This article is about recent state of sewerage and wastewater treatment in Serbia. It consists of an analysis of the development and the percentage of population connections to the sewerage network. It provides data on the state of wastewater treatment plants in Serbia, as well as on the amount and method of wastewater treatment. The paper aims to analyse the current situation in the field of wastewater treatment.
Management of invasive species Solidago canadensis in Ostrava region (Czech Republic)
Authors: Rajdus T , Svehlakova H , Plohak P , Stalmachova B 
Published: February 2020

Abstract
In this article authors deal with the possibilities of population management of Solidago canadensis species, which is not indigenous in Czech Republic and invasive. The study areas were chosen within the Poodri PLA, which is situated near the city Ostrava in Moravian-Silesian region. Invasive species Solidago canadensis as well as all the other invasive species in general poses a threat especially in the protected landscape areas such as Poodri PLA thanks to disrupting their natural ecosystems and reducing their exceptional biodiversity. Solidago canadensis can achieve those goals mainly thanks to the ability of quick propagation not only sexual one by seeds, but also asexual (vegetative) by rhizomes and thanks to releasing allelopathic substances which has negative impact on other plant species for example inhibition of their germination and growth. By these means it relatively quickly sets up monodominant covers, displaces original and rare plant species and poses threat to further development of the landscape of Poodri PLA. Management was proposed and applied on 5 study areas in Poodri PLA and after that the effectiveness was evaluated. There were chemical (application of herbicides) and mechanical (mowing) methods and their combinations used.
Reduction of nickel content from the model solution by consortium of fungal pellets and green algae
Authors: Remenarova M , Takacova A , Simonovicova A , Danc L , Nosalj S 
Published: February 2020

Abstract
The accumulation of Ni from the model aqueous solution (100 mg/L) by pellets of Aspergillus niger (A. niger) together with the green algae Chlorella sp., as a microbial consortium, during five days was compared. In the experiment, already formed pellets were used (5 mL A. niger conidia in Sabouraud Dextrose Broth, shaked with 200 rpm for 5 days). The experiment was carried out under static and also dynamic conditions at 25 °C. Oxidation-Reduction-Potential (ORP) and pH were measured as well in the first, third and fifth days. Microbial consortium (A. niger with Chlorella sp.) was found always more effective – reduction of the Ni content was higher 48.95 mg/L (under static conditions) and 56.45 mg/L (dynamic conditions), pH values were medium acidic (5.84 static conditions), to weak acid (6.52 dynamic conditions). Monitored ORP values were significantly reduced in the range of -309 mV up to - 385 mV in the Ni model aqueous solution, when the both microorganisms were present. This reduction was attributed to the anoxic conditions occurred when the Reactive Oxygen Species (ROS) radicals were produced by the photoactive pigments in the algae chloroplasts.
Combined aeration and mixing system and its use in practice
Authors: Singrova V , Sevcik J 
Published: February 2020

Abstract
The article deals with combined systems, which are mainly used in wastewater treatment plants for the purpose of aeration and mixing. These systems are mainly installed in activation reactors, but their use is also possible, for example, in sludge storage tanks. The combined systems are capable of guaranteeing the required values of relevant monitored pollution indicators at the WWTP effluent. The aim of this article is to describe the activation reactor control algorithm with the combined system. Reliable functionality is proved by the presented average values at the WTP effluent, which meet the required emission limits set by relevant permits.
Environmental Awareness and its Influence on Household Consumption of Goods
Authors: Stofejova L 
Published: February 2020

Abstract
The thesis was aimed at investigation of the level of environmental awareness of consumers in the Slovak Republic and its influence on household consumption, production and treatment of household waste. The survey examined the average amount of separated household waste, the average food costs, the level of environmental awareness, the possibilities to separate waste in a household or nearby and other features. The results of the investigation revealed that the average amount of separated waste in a household was just about 50%, despite of the fact that consumers had possibilities for separation in their household. There were used eligible mathematical and statistical methods and the hypothesis testing that confirmed differences between the estimated rate of recycled waste in Slovakia and in households.
Developing a Water Quality Index (WQI) for River Resources Management in Kien Giang Province, Vietnam
Authors: Tran Q B , Pham A D 
Published: February 2020

Abstract
The objective of this study was to develop a water quality index (WQI) for the surface water management of about 6,299 Km2 in Kien Giang Province. The water quality index (WQI) methodology, which recommended by the Delphi method and Liou et (2004) was used. Seven parameters were selected to derive the WQI for the estimation of water quality in Kien Giang including pH, dissolved oxygen (DO), Biochemical Oxygen Demand (BOD5), total solid suspended (TSS), chloride (Cl−), ammonia (NH4
+), and coliform. Total 48 samples were taken in March and September of 2014, 2015, 2016, 2017, and 2018. Through the result of WQI caculation for each monitoring time and seasonal differences in WQI were noted. The WQI was categorized from 51 to 85 in March 2018; and from 48 to 77 in September 2018. The water quality at the 48 sites in the study area was divided into three levels: (1) use for domestic purposes but need appropriate handling measures; (2) use for irrigation purposes; and, (3) use for other appropriate purposes. The WQI was established to assess the rivers and streams’s quality in Kien Giang as a tool to evaluate the river and canal water’s total quality. This WQI contributes to control of water quality effectively in order to provide informations to protect water resources as well as to serve people’s lives.
Sn-Doped Hematite Nanoparticles for Potential Photocatalytic Dye Degradation
Authors: Em Svetlana , Yedigenov Mussa , Khamkhash Laura , Molkenova Anara , Sh. Atabaev Timur 
Published: February 2020

Abstract
Recently, low-cost hematite (α-Fe2O3) metal oxide semiconductor has attracted enormous attention for the photoelectrochemical water splitting and photocatalytic applications. The main purpose of this work is to study the effects of Sn-doping on the photocatalytic properties of hematite nanoparticles (NPs). Morphology and physicochemical properties of prepared samples were analyzed using X-ray diffraction analysis (XRD), transmission electron microscope (TEM), and UV-vis spectroscopy. Rhodamine B (RB) dye was used as a model organic pollutant to test the photocatalytic activity of prepared samples. It was found that the photocatalytic activity of Sn-doped hematite NPs was higher than that of the undoped hematite NPs. The recyclability tests suggested that 3 mol% Sn-doped hematite NPs can be used as a promising reusable photocatalyst for dyes degradation.
Interior Inspection for Equipment and Furnishings System of Civil Aircraft
Authors: Jianbin Zhou , Xinyuan Zhang , Xiaozheng Wang 
Published: February 2020

Abstract
Equipment and Furnishings System of civil aircraft has many sub-systems, including Pilot Seat, Observer Seat, Cabin Attendant Seat, Galley, Lavatory, Passenger Seat, Overhead Bin, Cockpit Lining, Cabin Lining, Cargo Lining, Emergency Equipment, Passenger Service Unit and Placards/Markings. Inspection (MOC7), as one of means of compliance for certification, is usually used for the certification of the regulations of FAR25.562, 785, 815, etc. The sub-systems in Equipment and Furnishings System are very different at every aspect. They have different functions, working principles and system architectures. These differences make the inspection of Equipment and Furnishings System complicated. A lot of details need attention. This article described the inspection requirement and Pass/Failure criteria for Equipment and Furnishings System.
Automated assessment of the low-rigid composite parts influence on the product assemblability in the GePARD system
Authors: Leonovich D S , Zhuravlev D A , Karlina Yu I , Govorkov A S , Karlina A I 
Published: February 2020

Abstract
Composite components tend to have higher deviations from the nominal dimension in conjunction with metal components. Composites production processes simulation methods have already been developed before long time ago. This article presents the possibility of integrating the technique of non-rigid dimensional chains, taking into account the elastic properties of composite materials to assess the products assemblage with machinery parts from composite materials, on the basis of three-dimensional GePARD system. The fundamental points of the dimensional chain calculating method with non-rigid parts, as well as methods of assessing the stiffness for some types of composite materials, which take into account some peculiarities of its structure, are also examined. The assemblability of an assembly unit is represented by the parameter of the functional assembly requirement depending on the critical accuracy characteristics.
Synthesis, characterization and photocatalytic performance of iron molybdate (Fe2(MoO4)3) for the degradation of endosulfan pesticide
Authors: Parveen S , Bhatti I A , Ashar A , Javed T , Mohsin M , Hussain M T , Khan M I , Naz S , Iqbal M 
Published: February 2020

Abstract
Iron molybdate was prepared via simple solution chemistry method and the photocatalytic degradation of a pesticide (endosulfan) was investigated under visible light irradiation. As-prepared (Fe2(MoO4)3) was characterized using scanning electron microscope (SEM), x-ray diffraction (XRD), energy dispersive x-ray spectra (EDX), diffused reflectance spectroscopy (DRS) and Zeta particle sizer techniques. The iron molybdate crystallite size was 36 nm, while grain size was in the range of 160–340 nm. The particles of polymetallic compound were spherical, highly porous and with fluffy texture indicating high surface area. DRS revealed Fe2(MoO4)3 was active under visible region since band gap value calculated was 2.7 eV. Response surface methodology (RSM) was employed for the optimization of photocatalytic activity (PCA) of Fe2(MoO4)3 as a function of catalyst dose, H2O2 dose, solution pH and concentration of endosulfan and up to 77% degradation was achieved at optimum conditions, which was monitored by UV/vis spectroscopy. In response to endosulfan degradation, the chemical oxygen demand (COD) and total organic carbon (TOC) were reduced up to 76% and 67%, respectively. Results revealed that iron molybdate is highly efficient photocatalyst for the degradation of endosulfan under solar light irradiation and could possibly be used for the treatment of endosulfan containing wastewater.
Coupled thermo-fluidic model for thermal energy storage based on liquid solid phase change
Authors: Ben zohra Mouna , Riad Amine , Alhamany Abdelilah , Sennoune Mohamed 
Published: February 2020

Abstract
The production and storage of thermal energy are important processes that contribute to the satisfaction of daily needs. They are effective ways of managing the thermal energy available from various solar applications. The most efficient storage technique is the use of phase change materials (PCMs) because these components can keep large amounts of thermal energy in stock. The problem is that this approach continues to be confronted with difficulties despite significant progress in research, design and modelling. Nevertheless, these difficulties can be resolved through numerical simulations that enable the identification of powerful tools for optimising thermal system design and predicting thermal behaviour. Correspondingly, in this work, thermo-mechanical modelling was conducted to describe the different methods of heat transfer that can optimise thermal energy storage via PCMs. This study also established a numeric resolution and the spatio-temporal discretisation of the basic equations accompanying the numerical model. The proposed numerical solution improves the prediction of thermal behaviour and can be used as a guide in designing new systems capable of producing and storing solar energy.
A novel synthesis of TiO2/GO nanocomposite for the uptake of Pb2+ and Cd2+ from wastewater
Authors: Siddeeg Saifeldin M 
Published: February 2020

Abstract
Ionic liquids attract attention in the last years due to its powerful solvation properties. For this reason, in current study 1-ethyl-3-methylimidazolium tetrafluoroborate [EMIM-BF4] ILs was used for the synthesis of high surface TiO2/GO nanocomposite, as an active material for heavy metal removal from aqueous media. FT-IR, transmission electron microscopy (TEM), scanning electron microscope (SEM), and x-ray diffraction (XRD) techniques were employed for identification of the novel nanocomposite. Batch experiments were conducted for Cd+2 and Pb+2 uptake from wastewater by the synthesized nanocomposite. The effect of parameters affecting adsorption capicity, such as contact time, pH, nanocomposite dosage and the initial concentration of heavy metals were examined for Cd+2 and Pb+2 removal by the prepared nanocomposite. The removal efficiency of Cd+2 and Pb+2 was 69.36% and 89%, respectively, under optimal conditions confirming the ability to use the prepared nanocomposite for wastewater treatment from heavy metals with high efficiency.
Characterizations of TIG welded MB3/AZ80 joint using various filler wires
Authors: Xu Chuan , Zhang Lizhi 
Published: February 2020

Abstract
In this study, the MB3 and AZ80 Mg alloys were welded by tungsten inert gas welding process with different filler wires. The influences of Al content in filler metal on weld morphologies, microstructure and mechanical performances were studied. Experimental results reveal that the seam width of joint increased with the improvement of welding current and pores occurred in the weld seam with excessive heat input. In the weld seam zone, a great deal of Mg17Al12 precipitated phases occurred owing to the Al element in filler wire, which resulted in the enhanced metallurgical bonding and the increased micro hardness. The maximum tensile strength of 208 MPa was obtained with optimal current of 80 A and AZ61 filler wire, representing an 85% joining efficiency relative to MB3 Mg alloy parent plate. And fracture occurred at weld seam zone, revealing the potential point of joint strength improvement.