scholarly journals Characterization of odours emitted by liquid waste treatment plants (LWTPs)

2016 ◽  
Vol 18 (4) ◽  
pp. 721-727 ◽  
Keyword(s):  
Waste Treatment ◽  
Liquid Waste ◽  
Management Tool ◽  
Complex Nature ◽  
Atmospheric Conditions ◽  
Exposed Population ◽  
Waste Treatment Plants ◽  
Odour Emissions ◽  
Definition Of

<p>Odour emissions from liquid waste treatment plants (LWTPs) generally cause significant effects on the environment in terms of nuisance to exposed population. The particular and complex nature of the mixture of the volatile substances, its variability in time and the strong influence of the atmospheric conditions, are the elements that delayed their regulation and relative management.</p> <p>Limited data are available in the technical and scientific literature, regarding the odour emissions characterization from liquid waste treatment plants. Moreover there isn’t a common strategy from the different European Countries in the regulation of their emissions.</p> <p>Different methods can be used to measure odour emissions from environmental engineering plants, and currently, in Europe, the most used techniques for odour emissions characterization and quantification is the dynamic olfactometry, according to EN 13725:2003.</p> <p>The aim of this study is the characterization of the odour emissions from different liquid waste treatment plants (LWTPs), trough a case study of two large real LWTPs, in order to identify the principal odour sources and to define their related odour emissions.</p> <p>Odour Concentration Index (OCI) is proposed as a useful and simply odour management tool for the identification of the priority actions necessary to identify and control the main odorous sources. Relationship between the measured odour emissions and the types of treated liquid waste (identified in terms of EWC code, COD and NH4<sup>+</sup>) is also discussed.</p> <p>Results show that the influent collection tank is the source with the highest detected odour emissions. OCI results are useful for the definition of a clear priority action for odour control, similar for both investigated plants. Between the characterized types of liquid waste treated by LWTPs the leachate (EWC 190703) show the maximum odour emissions.</p>

scholarly journals Physico-chemical characterization of liquid waste from sugar production unit labs in Zuenoula, Côte d'Ivoire

2020 ◽  
Vol 14 (7) ◽  
pp. 2641-2651
Author(s):  
Atolé Brice Bienvenu Kedi ◽  
Yao Francis Kouame ◽  
Seka Simplice Kouassi ◽  
Alika Odile Abry ◽  
Koffi Félix Konan
Keyword(s):  
Waste Treatment ◽  
Liquid Waste ◽  
Chemical Characterization ◽  
National Standards ◽  
Decision Makers ◽  
Physico Chemical ◽  
Standard Value ◽  
Industrial Unit ◽  
Factory Laboratory

Managing liquid waste from the laboratories of Integrated Agricultural Unit (IAU) of Zuénoula (Côte d´Ivoire) is a major concern for the decision-makers of the company, who are working to solve this problem in their sustainable development policy. This work aims at quantifying liquid waste from the agronomic laboratories and factory of IAU of Zuénoula and to assess their level of pollution. The quantities of waste produced daily are estimated at 28.5 L, 52.6 L and 2600 L respectively for waste from the agronomy laboratory, the factory laboratory and from the rinsing water from latter's glassware. The following parameters were analyzed, temperature, pH, conductivity, turbidity, total suspended solids, COD, BOD5, total nitrogen, total phosphorus, zinc, copper, lead and mercury. The results of these analyzes generally showed that waste produced did not comply with national standards. In particular, the level of lead was very high in these liquid wastes and reached 160 times the standard value. These results require a waste treatment system, which would reduce all the parameters, in particular those of the most noxious metals (lead and mercury).Keywords: Heavy metals, Pollution, Industrial unit, Ivorian standards, Wastewater.

Control of odour emission in wastewater treatment plants by direct and undirected measurement of odour emission capacity

2012 ◽  
Vol 66 (8) ◽  
pp. 1627-1633 ◽  
Author(s):  
T. Zarra ◽  
S. Giuliani ◽  
V. Naddeo ◽  
V. Belgiorno
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Sewage System ◽  
Exposed Population ◽  
Wastewater Quality ◽  
Odour Emissions ◽  
Tourism Economy ◽  
Emission Capacity

Odour emissions from wastewater treatment plants (WWTPs) are considered to be the main causes of disturbance noticed by the exposed population and have relevant impacts on both tourism economy and land costs. Odour impact from WWTPs is generated by primary and secondary odour emissions. Primary odour emissions are related especially to the wastewater type and variability discharged into the sewer and directed to the WWTP, and to the wastewater collection and sewage system. Secondary odours are related to the treatment units of the plant. Several studies describe the key role of primary odour emissions and how they are strongly related to odour impacts of WWTPs. In this way, a opportune characterization of the emission capacity of primary odour could be an effective way to control odour emission in the WWTPs. In this study the odour emission capacity (OEC) of different domestic sewers was described and investigated; a correlation between the OEC and the main physical–chemical parameters of wastewater quality was also carried out. Results of this study identify the optimum conditions for sampling and measuring OEC in wastewaters and define its dependence by wastewater quality. These results can contribute to setting the standards for the maximum odourant content of wastewater that are discharged into the publicly owned sewage system.

Instrumental characterization of odour: a combination of olfactory and analytical methods

2009 ◽  
Vol 59 (8) ◽  
pp. 1603-1609 ◽  
Author(s):  
T. Zarra ◽  
V. Naddeo ◽  
V. Belgiorno ◽  
M. Reiser ◽  
M. Kranert
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Sensorial Analysis ◽  
Chemical Substances ◽  
Considerable Uncertainty ◽  
Dimethyl Disulphide ◽  
Exposed Population ◽  
Odour Emissions

Odour emissions are a major environmental issue in wastewater treatment plants and are considered to be the main cause of disturbance noticed by the exposed population. Odour measurement is carried out using analytical or sensorial methods. Sensorial analysis, being assigned to the “human sensor”, is the cause of a considerable uncertainty. In this study a correlation between analytical and sensorial methods was investigated. A novel tool was used to both define odour indexes and characterise the odour sources and the volatile substances that cause annoyance in a wastewater treatment plant, with the aim to remove the subjective component in the measure of the odours and define the induced impact. The sources and the main chemical substances responsible for the olfactory annoyances were identified. Around 36 different substances were detected, with more than half being smell relevant components as well as responsible. Dimethyl disulphide was identified as key compound. Results highlight the applicability of highly correlation between analytical and sensorial methods in odour emission monitoring.

scholarly journals A novel tool for estimating the odour emissions of composting plants in air pollution management

2013 ◽  
Vol 11 (4) ◽  
pp. 477-486 ◽  
Keyword(s):  
Air Pollution ◽  
Analytical Techniques ◽  
Climatic Conditions ◽  
Complex Nature ◽  
Continuous Assessment ◽  
Time Restrictions ◽  
Exposed Population ◽  
Pollution Management ◽  
Odour Emissions ◽  
The Cost

Odour emissions are a major environmental issue in sanitary environmental engineering plants, due to the increasing number of complaints being made by the exposed population. The particular and complex nature of the substances considered to be the cause of the odour impact, their variability in time and the climatic conditions, as well as the subjectivity of the odour perception, are the elements that have delayed their regulation. For this reason there are few international laws that set the limits of odour emissions from industrial sources and/or define the criteria of quality related to the smell. In particular, there are currently no regulations that deal with this problem in Italy. Analytical techniques such as the use of surrogate chemical markers (i.e. H2S or NH3) as well as the chemical analysis of odorous mixtures by chromatographic techniques (i.e. GC-MS) can be used for continuous assessment, but are limited, due to usually being compound specific, which may not always relate to olfactory perception. Whereas olfactory assessment offers an accurate measurement of olfactory annoyance. However, the cost, potential subjectivity and time restrictions (due to being laboratory based) make them unsuitable for continuous assessment in terms of air quality monitoring. In this study, a novel tool based on a highly innovative on-site analytical instrument (Portable GC-MS Hapsite, Inficon) was used to identify and characterize the volatile substances that cause odour annoyance and the main sources in a composting plant. At the same time, this work identified odours key compounds and investigated the relationship between their concentration measured by GC-MS analysis and the performances of the plant. The main chemical substances responsible for the olfactory annoyances were also identified. In conclusion, odour abatement system (static biofilter) efficiency was tested in terms of reduction of both key compounds and quality of the clean gas composition. The results highlight the applicability of this tool in directly monitoring odour emissions in terms of air pollution management. 38 different substances are detected, with almost half being smell relevant components as well as responsible for the typical smell of composting plants. Limonene and 2-Butanone are identified as key compounds connected to the specific production process.

Immunochemical Characterization of Setaria cervi Microfilarial Antigens Using Novel Antibodies

2019 ◽  
Vol 19 (14) ◽  
pp. 1263-1274 ◽  
Author(s):  
Anuradha Kalani ◽  
Komal Kalani ◽  
Poonam Chaturvedi ◽  
Pankaj Chaturvedi
Keyword(s):  
Adult Worm ◽  
Diagnostic Tests ◽  
Protective Immunity ◽  
Complex Nature ◽  
Immune Recognition ◽  
Setaria Cervi ◽  
Crossed Immunoelectrophoresis ◽  
Study Results ◽  
Immune Rabbit

Background:Filariasis affects millions of people in tropical and subtropical regions of the world and is caused by nematode roundworm. In order to develop a vaccine and specific diagnostic tests, it is important to characterize different stages of the filarial worms. Microfilariae (Mf) stage of the roundworm is found in host’s blood or lymph vessels and can be important not only for developing better immunodiagnostics but also for understanding immune recognition and its relevance to immunepathogenesis and protective immunity.Objective:The present study aimed to immunocharacterize Mf and adult worm antigens that could be helpful in future diagnostic tests.Method:Four different immune sera against Setaria cervi intact live, intact live with adjuvant, intact glutaraldehyde fixed with adjuvant and total somatic Mf were prepared and used for the immunocharacterization of Mf antigens.Results:Our study results suggest that compared to fixed intact Mf, live intact Mf are more immunogenic, as the immune sera generated against intact live Mf showed high ELISA reactivity with Setaria cervi Mf and adult worm antigens. All the four immune sera IgG fractions had surface specificity as determined through considerable ELISA reactivity with S. cervi intact Mf. When tested under native conditions (immunoelectrophoresis and crossed immunoelectrophoresis), all the four immune rabbit sera were able to detect antigens of S. cervi Mf and adult stages.Conclusion:These results can be useful in detailed understanding of the complex nature of the Mf and adult antigens, which are prerequisites in the development of vaccine and more specific diagnostic tests.

Fiduciary Principles in Investment Advice

2019 ◽  
pp. 144-165
Author(s):  
Arthur B. Laby
Keyword(s):  
Fiduciary Duty ◽  
Duty Of Care ◽  
Complex Nature ◽  
State Law ◽  
Fiduciary Duties ◽  
Legal Obligations ◽  
Standards Of Conduct ◽  
Investment Advisers ◽  
Definition Of ◽  
Investment Advice

This chapter examines the fiduciary principles governing investment advice. Fiduciary principles in investment advice are both straightforward and complex. They are straightforward because most investment advisers are considered fiduciaries and subject to strict fiduciary duties under federal and state law. Their complex nature arises from the fact that many individuals and firms provide investment advice but are not deemed investment advisers and, therefore, are not subject to a fiduciary obligation. This chapter first explains whether and when an advisory relationship gives rise to fiduciary duties by focusing on both federal and state law, as well as the individuals and firms that typically provide investment advice. In particular, it looks at certain persons and entities excluded from the definition of investment adviser and thus not subject to the Investment Advisers Act of 1940, namely broker-dealers, banks, and family offices as well as accountants, lawyers, teachers, and engineers. The chapter also considers fiduciaries under ERISA, the Investment Company Act, and the Commodity Exchange Act before discussing the fiduciary duty of loyalty and how it is expressed and applied in investment advisory relationships; the fiduciary duty of care and how it differs from other standards of conduct, such as a duty of suitability; and other legal obligations imposed on investment advisers and how those obligations relate to an adviser’s fiduciary duty. Finally, the mandatory or default terms with regard to an investment adviser’s fiduciary duties are explored, along with remedies available for breach of fiduciary duty.

scholarly journals Experimental Evaluation of Shear Behavior of Stone Masonry Wall

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2313
Author(s):  
Maria Luisa Beconcini ◽  
Pietro Croce ◽  
Paolo Formichi ◽  
Filippo Landi ◽  
Benedetta Puccini
Keyword(s):  
Shear Behavior ◽  
Stone Masonry ◽  
Masonry Walls ◽  
Mechanical Parameters ◽  
In Situ Tests ◽  
Capacity Curves ◽  
Historical Structures ◽  
Definition Of

The evaluation of the shear behavior of masonry walls is a first fundamental step for the assessment of existing masonry structures in seismic zones. However, due to the complexity of modelling experimental behavior and the wide variety of masonry types characterizing historical structures, the definition of masonry’s mechanical behavior is still a critical issue. Since the possibility to perform in situ tests is very limited and often conflicting with the needs of preservation, the characterization of shear masonry behavior is generally based on reference values of mechanical properties provided in modern structural codes for recurrent masonry categories. In the paper, a combined test procedure for the experimental characterization of masonry mechanical parameters and the assessment of the shear behavior of masonry walls is presented together with the experimental results obtained on three stone masonry walls. The procedure consists of a combination of three different in situ tests to be performed on the investigated wall. First, a single flat jack test is executed to derive the normal compressive stress acting on the wall. Then a double flat jack test is carried out to estimate the elastic modulus. Finally, the proposed shear test is performed to derive the capacity curve and to estimate the shear modulus and the shear strength. The first results obtained in the experimental campaign carried out by the authors confirm the capability of the proposed methodology to assess the masonry mechanical parameters, reducing the uncertainty affecting the definition of capacity curves of walls and consequently the evaluation of seismic vulnerability of the investigated buildings.

Fundamental relations and identities of fuzzy hyperalgebras

2021 ◽  
pp. 1-10
Author(s):  
Narjes Firouzkouhi ◽  
Abbas Amini ◽  
Chun Cheng ◽  
Mehdi Soleymani ◽  
Bijan Davvaz
Keyword(s):  
Universal Algebra ◽  
Equivalence Relation ◽  
Polynomial Function ◽  
Equivalence Relations ◽  
Fundamental Relation ◽  
Term Function ◽  
Biological Phenomena ◽  
Definition Of

Inspired by fuzzy hyperalgebras and fuzzy polynomial function (term function), some homomorphism properties of fundamental relation on fuzzy hyperalgebras are conveyed. The obtained relations of fuzzy hyperalgebra are utilized for certain applications, i.e., biological phenomena and genetics along with some elucidatory examples presenting various aspects of fuzzy hyperalgebras. Then, by considering the definition of identities (weak and strong) as a class of fuzzy polynomial function, the smallest equivalence relation (fundamental relation) is obtained which is an important tool for fuzzy hyperalgebraic systems. Through the characterization of these equivalence relations of a fuzzy hyperalgebra, we assign the smallest equivalence relation α i 1 i 2 ∗ on a fuzzy hyperalgebra via identities where the factor hyperalgebra is a universal algebra. We extend and improve the identities on fuzzy hyperalgebras and characterize the smallest equivalence relation α J ∗ on the set of strong identities.

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