scholarly journals Characterisation of the chemo-mechanical behaviour of clays polluted by BTEX: a case study of benzene

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hicham KAHLOUCHE ◽  
Abderrahim GHERIS ◽  
Mohamed GUENFOUD
Keyword(s):  
Mechanical Behaviour ◽  
External Stress ◽  
Strong Increase ◽  
Low Friction ◽  
Organic Contamination ◽  
Mechanical Coupling ◽  
Chemical Behaviour ◽  
Polluted Sites ◽  
Two Stages

AbstractIn chemo-mechanical coupling of clays, chemical phenomena are likely to have a stronger influence on the mechanical behaviour and mechanical actions can modify the chemical behaviour. The understanding of these different phenomena, taking into account the coupled mechanisms, is essential in the context of the problem of the durability of structures and works built on polluted sites. Thus, the laboratory characterisation of the chemo-mechanical behaviour of a clay contaminated by light hydrocarbon pollutant (BTEX: benzene) was carried out. First in the absence of pollutants, i.e., by the presence of water only, then under the influence of the pollutant, all in two stages: with no external stress, then under imposed external stress. This study presents an experimental protocol based on a series of uniaxial consolidation tests, specific oedometric tests and direct shear strength, this tests performed under controlled saturation conditions and in the presence of organic contamination by benzene. All results confirm the influence of pollutants in different concentrations on the mechanical behaviour of the soil. They show a strong increase in compressibility and a significant increase in swelling, the soil becomes more cohesive, low friction and less elastic. Furthermore, the results show that external load forces play a major role in modifying the behaviour of clay.

The Implementation of Biological Phosphorus and Nitrogen Removal with the Bio-Denipho Process on a 265,000 PE Treatment Plant

1992 ◽  
Vol 25 (4-5) ◽  
pp. 161-168 ◽  
Author(s):  
J. Einfeldt
Keyword(s):  
Nitrogen Removal ◽  
Treatment Plant ◽  
First Year ◽  
In Series ◽  
Design Loads ◽  
Last Stage ◽  
Two Stages ◽  
The City ◽  
Biological Phosphorus

A process, called Bio-Denipho, for combined biological phosphorus and nitrogen removal in a combination of an anaerobic tank and two oxidation ditches is described. In this process the anaerobic tank consisting of three sections working in series is followed by two oxidation ditches. These too are working in series, but with both inlet to and outlet from the tanks changing in a cycle. The Bio-Denipho process is described specifically for the process itself and as a case study for the implementation of the process on a 265,000 pe wastewater treatment plant for the city of Aalborg in Denmark. The plant was designed and erected in two stages and the last stage was inaugurated October 31,1989. Lay-out and functions for the plant is described and design loads, plan lay-out and tank volumes are given in this paper together with performance data for the first year in operation.

Field Performance and Analysis of 3-m-Diameter Induced Trench Culvert under a 19.4-m Soil Cover

2008 ◽  
Vol 2045 (1) ◽  
pp. 68-76 ◽  
Author(s):  
Bethanie A. Parker ◽  
Rodney P. McAffee ◽  
Arun J. Valsangkar
Keyword(s):  
Pressure Distribution ◽  
Earth Pressure ◽  
Field Performance ◽  
Overburden Pressure ◽  
Vertical Pressure ◽  
Earth Pressures ◽  
Design Loads ◽  
Horizontal Pressure ◽  
Two Stages

An induced trench installation was instrumented to monitor earth pressures and settlements during construction. Some of the unique features of this case study are as follows: (a) both contact and earth pressure cells were used; (b) part of the culvert is under a new embankment and part was installed in a wide trench within an existing embankment; (c) a large stockpile was temporarily placed over the induced trench; and (d) the compressible material was placed in two stages. The maximum vertical pressure measured in the field at the crown of the culvert was 0.24 times the overburden pressure. The maximum horizontal pressure measured on the side of the culvert at the springline was 0.45 times the overburden pressure. The column of soil directly above the compressible zone settled approximately 40% more than did the adjacent fill. The field results at the crown and springline compared reasonably with those observed with numerical modeling. However, the overall pressure distribution on the pipe was expected to be nonuniform, the average vertical pressure calculated by using numerical analysis on top of the culvert over its full width was 0.61 times the overburden pressure, and the average horizontal pressure calculated on the side of the culvert over its full height was 0.44 times the overburden pressure. When the full pressure distribution on the pipe is considered, the recommended design loads from the Marston–Spangler theory slightly underpredict the maximum loads, and the vertical loads control the design.

RE-engineered factory acceptance testing under the new normal

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sanduni Peiris ◽  
Nayanthara De Silva
Keyword(s):  
Construction Industry ◽  
Geographical Area ◽  
Test Reliability ◽  
Acceptance Testing ◽  
Sri Lankan ◽  
Content Type ◽  
Future Studies ◽  
Physical Touch ◽  
Two Stages

Purpose Factory acceptance testing (FAT) in the construction industry has been severely hampered due to restrictions in cross-border travel resulting from the COVID-19 pandemic. Consequently, virtual FAT (vFAT) became a popular substitute for physical FAT. However, the credibility of vFAT is being questioned because it was adopted without much scrutiny. Hence, this study is aimed at investigating vFATs and re-engineering the FAT process to suit an effective vFAT environment.Design/methodology/approach A comprehensive literature search on FAT procedures was followed by two stages of expert interviews with eight leading subject experts and a case study. The findings were analysed using code-based content analysis on NVivo software.Findings Strengths of vFATs include “reduction in cost and time consumed”, “flexibility for more participants” and “faster orders”. Most emphasized weaknesses include “lack of reliability” and “lack of technology transfer”. vFAT has mostly increased test reliability by “improving accessibility” and has decreased reliability by “restricting physical touch and feel observation of the equipment”. A four-step vFAT process was developed with a noteworthy additional step called “Pre-FAT Meeting”.Research limitations/implications The scope of this study is limited to the Sri Lankan construction industry. Expansion of the geographical area of focus is recommended for future studies.Originality/value The findings of this study unveil a vFAT process, which is timely and beneficial for construction practitioners to optimize and enhance the effectiveness of vFATs which are currently conducted in a disarranged manner.

Assessing the Performance of a SAR Boat Location-Allocation Plan via Simulation

2019 ◽  
pp. 67-97
Author(s):  
Mumtaz Karatas ◽  
Nasuh Razi ◽  
Hakan Tozan
Keyword(s):  
Optimal Allocation ◽  
Aegean Sea ◽  
Allocation Scheme ◽  
Loss Of Life ◽  
Location Allocation ◽  
Maritime Search And Rescue ◽  
Two Stages ◽  
Critical Process ◽  
Level Process

Maritime search and rescue (SAR) operation is a critical process that aims to minimize the loss of life, injury, and material damage by rendering aid to persons in distress or imminent danger at sea. Optimal allocation of SAR vessels is a strategic level process that is to be carried out with a plan to react rapidly. This chapter seeks to evaluate the performance of a SAR boat location plan using simulation. The proposed methodology in this chapter works in two stages: First, an optimal allocation scheme of SAR resources is determined via a multi-objective mathematical model. Next, simulation is used to test the performance of the analytical solution under stochastic demand. With the heaviest traffic and maritime risk, the methodology is applied to a case study in the Aegean Sea.

Improving ESP Performance with Two Stages of Gas Separation in 7 Casing Case Study

2020 ◽  
Author(s):  
Anderson Delgado ◽  
Jorge Espinosa ◽  
Maria Hernandez ◽  
Luis Guanacas ◽  
Gustavo Gonzalez ◽  
...  
Keyword(s):  
Gas Separation ◽  
Two Stages

scholarly journals Assessing the efficiency and the criticality of the elements belonging to a complex territorial system subject to natural hazards

2006 ◽  
Vol 6 (1) ◽  
pp. 21-32 ◽  
Author(s):  
R. Minciardi ◽  
R. Sacile ◽  
E. Trasforini
Keyword(s):  
Emergency Management ◽  
Natural Hazards ◽  
External Stress ◽  
Decision Makers ◽  
Decision Problems ◽  
Natural Phenomenon ◽  
Physical Vulnerability ◽  
Natural Risk ◽  
Service Demand

Abstract. The effects of natural hazards can be mitigated by the use of proper "pre-event" interventions on "key" elements of the territory, that is on elements that are mostly vulnerable to a given catastrophic scenario and whose loss of functionality can cause damages on people, property and environment. In this respect, methodologies and tools should be studied to support decision makers in the analysis of a territory, in order to point out such elements. In this work, vulnerability is taken into account under two aspects: "physical vulnerability", which measures the propensity of a territorial element to suffer damage when subject to an external stress corresponding to the occurrence of a natural phenomenon; "functional vulnerability", which measures the propensity of a territorial element to suffer loss in functionality, even when that is caused by the loss of functionality of other territorial elements. In the proposed modeling approach, vulnerability is represented through the use of a graph-based formalization. A territorial system is represented as a complex set of elements or sub-systems. Such elements have differentiated and dedicated functions, and they may be functionally interconnected among them. In addition, vulnerability is defined through the use of two different variables, namely the criticality and the efficiency. Focusing the attention on the temporal phases corresponding to the occurrence of a calamitous event, the first one measures the service demand of an element, whereas the efficiency is a measure of the service that can be offered by such an element. The approach presented is largely independent from the natural risk considered. Besides, the tools introduced for the vulnerability analysis of the territorial system can also be used to formalize decision problems relevant to the location of the available resources for emergency management. A specific case study pertaining to the hydrological risk in the Val di Vara area (Italy) is presented.

Effects of Landfill Leachate on Mechanical Behaviour of Adjacent Soil: a Case Study of Saravan Landfill, Rasht, Iran

2018 ◽  
Vol 16 (10) ◽  
pp. 1503-1513 ◽  
Author(s):  
Nader Shariatmadari ◽  
Behnam Askari Lasaki ◽  
Hasan Eshghinezhad ◽  
Pourya Alidoust
Keyword(s):  
Mechanical Behaviour ◽  
Landfill Leachate ◽  
Adjacent Soil

scholarly journals Design and Operation of a Modern Polish Plant for Plastic Waste Recycling through the Degradative Depolymerization Process. A Case Study

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6620 ◽  
Author(s):  
Andrzej Duda ◽  
Arkadiusz Fenicki ◽  
Patryk Molski ◽  
Elżbieta Szostak ◽  
Piotr Duda
Keyword(s):  
Negative Pressure ◽  
Waste Recycling ◽  
Considerable Reduction ◽  
Industrial Scale ◽  
Process Safety ◽  
Innovative Solutions ◽  
Plastic Waste Recycling ◽  
High Level ◽  
Two Stages

The paper describes an installation for the degradative depolymerization of polyolefin materials obtained from wastes, hereinafter also referred to as depolymerization for simplicity. The plant, on an industrial scale, is one of the few operating in Poland. However, it is one of the most modern plants in this industry. Design solutions, construction of particular technological lines, compliance with national and EU regulations and the high level of process safety were described in this paper as well as compared to other plants of this type in Poland. Different solutions were presented in drawings and photos of the plant and in fragmentary technological diagrams. The types of waste and the methods of their processing by the plant were also characterized in accordance with the applicable regulations. The waste throughput is from 2000 to 4000 kg/h, while the efficiency of the depolymerization installation itself is 1500 kg/h. The industrial-scale depolymerization process is carried out in one or two stages: by homogenization (extraction) at a temperature up to 200 °C and depolymerization at temperatures up to 400 °C. The obtained products (energy goods) are sold for further processing. The processes, devices and methods are characterized by novel, innovative solutions, covered by a number of patents, which are also described below. The advantage of the presented technology is the substantial simplification of the process and thereby a considerable reduction in investment costs. Among others, the processes of distillation and rectification (low- and negative-pressure) were abandoned.

Photography and the Perils of Automaticity: P. H. Emerson, Copyright, and the Agency of the Artist

2020 ◽  
Author(s):  
JiHae Koo
Keyword(s):  
Copyright Law ◽  
Aesthetic Theory ◽  
Medium Specificity ◽  
Cultural Imaginary ◽  
Before And After ◽  
Artistic Medium ◽  
The Aesthetic ◽  
Two Stages ◽  
The Relationship

Abstract The photographer Peter Henry Emerson (1856–1936) is known today for the splash he made on the Victorian photographic scene in the 1880s with his bold refusal to follow his fellow art photographers (collectively known as the Pictorialists) in latching the new medium on to the aesthetic conventions of painting. His conventional position within art history is thus as a precursor to the Modernist conception of photography’s medium-specificity. Yet even if Emerson’s work was ahead of its time in its proto-Modernist refusal of painterly conventions, it also has qualities that place it more squarely within late-Victorian discourses. In particular, I argue, Emerson’s ongoing efforts to secure his photographs via copyright law need to be understood as reflective of a distinctly nineteenth-century cultural imaginary. This essay addresses the relationship between Emerson’s aesthetic theory and copyright law by dividing Emerson’s career into two stages, before and after 1891, this being the year in which Emerson abruptly disavowed photography as an artistic medium in his short pamphlet ‘The Death of Naturalistic Photography’. Examining two photography books – Pictures of East Anglian Life (1888) and On English Lagoons (1893) – alongside late-Victorian debates about photographic copyright, I show that Emerson’s earlier belief in photographic copyright’s ability to retain the integrity of an artist’s vision breaks down after 1891. He loses faith in the ‘copyrightability’ of photography in 1891 when he recognizes the mechanical nature – or automaticity – of the camera. That is, Emerson realizes that the photograph is never purely the product of the artist. In sum, this case study shows that by the 1890s, photographic copyright was becoming detached from the notion of creativity and thus could no longer be the guarantee of a photographer’s claim to artistic individuality.

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