scholarly journals Diffuse Water Pollution from Agriculture: A Review of Nature-Based Solutions for Nitrogen Removal and Recovery

Water ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 1893
Author(s):  
Giuseppe Mancuso ◽  
Grazia Federica Bencresciuto ◽  
Stevo Lavrnić ◽  
Attilio Toscano

The implementation of nature-based solutions (NBSs) can be a suitable and sustainable approach to coping with environmental issues related to diffuse water pollution from agriculture. NBSs exploit natural mitigation processes that can promote the removal of different contaminants from agricultural wastewater, and they can also enable the recovery of otherwise lost resources (i.e., nutrients). Among these, nitrogen impacts different ecosystems, resulting in serious environmental and human health issues. Recent research activities have investigated the capability of NBS to remove nitrogen from polluted water. However, the regulating mechanisms for nitrogen removal can be complex, since a wide range of decontamination pathways, such as plant uptake, microbial degradation, substrate adsorption and filtration, precipitation, sedimentation, and volatilization, can be involved. Investigating these processes is beneficial for the enhancement of the performance of NBSs. The present study provides a comprehensive review of factors that can influence nitrogen removal in different types of NBSs, and the possible strategies for nitrogen recovery that have been reported in the literature.

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 495 ◽  
Author(s):  
Asim Ali Yaqoob ◽  
Tabassum Parveen ◽  
Khalid Umar ◽  
Mohamad Nasir Mohamad Ibrahim

Water is an essential part of life and its availability is important for all living creatures. On the other side, the world is suffering from a major problem of drinking water. There are several gases, microorganisms and other toxins (chemicals and heavy metals) added into water during rain, flowing water, etc. which is responsible for water pollution. This review article describes various applications of nanomaterial in removing different types of impurities from polluted water. There are various kinds of nanomaterials, which carried huge potential to treat polluted water (containing metal toxin substance, different organic and inorganic impurities) very effectively due to their unique properties like greater surface area, able to work at low concentration, etc. The nanostructured catalytic membranes, nanosorbents and nanophotocatalyst based approaches to remove pollutants from wastewater are eco-friendly and efficient, but they require more energy, more investment in order to purify the wastewater. There are many challenges and issues of wastewater treatment. Some precautions are also required to keep away from ecological and health issues. New modern equipment for wastewater treatment should be flexible, low cost and efficient for the commercialization purpose.


2017 ◽  
pp. 1082-1089
Author(s):  
Viktoras Račys ◽  
Linas Kliučininkas ◽  
Dalia Jankūnaitė ◽  
Ramunė Albrektienė

Water pollution characterization consumes a lot time, facilities and materials. Application of easy applicable and accurate method for pollution determination is quiet actual still now. Redox reactions in water are usually biologically mediated and therefore, the oxidation reduction potential (ORP) of wastewater and groundwater systems depends upon biodegradation processes. Oxidation and reduction reactions control the behaviour of many chemical constituents in the water. The determination of ORP is advisable in water that contains a relatively high concentration of a redox-active species, e.g., organic carbon, the salts of many metals (Fe2+, Mn2+) and strong oxidising (chlorine, oxygen) and reducing (sulfite ion) agents. Water pollution characterization upon ORP and different types of polluted water was investigated. The main outcome of this research – ORP can be used as easy applicable measurement for different types of water as pollution indicator.


2020 ◽  
Vol 11 (4) ◽  
pp. 132-148
Author(s):  
Oksana KHURTENKO ◽  
◽  
Kseniia BEREZIAK ◽  
Roman KHAVULA ◽  
Oksana VDOVICHENKO ◽  
...  

Professional coaching career is associated with a wide range of issues and problems which need to be solved and are directly or indirectly determined by creative activity. Therefore, an appropriate training process of students, in particular prospective coaches, is an essential scientific and practical problem. The article presents a thorough psychological analysis of the structure of decision-making in extreme situations and identifies different types of non-standard situations in a coaching job. Also, it clarifies such concepts as “situation”, “non-standard situation” and “extreme situation” in the activity of the individual. It describes different types of non-standard situations which can be manifested in professional coaching and their impact on the human psyche. It analyzes extreme conditions in the activities of athletes and coaches and the role of various mental functions and personality traits in problem-solving. Importantly, the article emphasizes the role of the coach’s reflection and self-regulation in solving non-standard tasks under non-standard conditions. It indicates that two theoretical views on the nature of the human psyche and thinking correspond to two approaches to studying this particular problem. According to the first one, that is an adaptive approach, creative thinking as a form of behaviour is the result of learning, and only some individuals have creative ability. To teach creativity, however, one needs to include the elements of creative behaviour (problem-solving) and heuristics in the educational material. Another approach assumes that thinking is a productive process emerging as a result of a certain problematic situation. Prerequisites for the creative process are cognitive abilities and research activities of the individual.


A comprehensive view of various techniques involved in detection of gamma rays, obtained from literatures has been presented. It also discusses with the current research activities carried out at various fronts, provides information about wide range of dosimeter available for detection of gamma rays. The dose range of each dosimeter is reviewed along with merits and demerits of various dosimeter techniques. Different types of sensing materials and their characteristics are discussed, with relative merits and demerits. The development of various types of optical fibres and their working principles are analyzed. The advantages of fibre Bragg grating over other fibres are also presented


Anthropology ◽  
2019 ◽  
Author(s):  
Ramah McKay

The term global health encompasses a variety of meanings, including the impact of globalization on health as well as threats to health around the globe. In use since the early 20th century, the term has proliferated widely since the 1990s. Most broadly, the term refers to ways of understanding and intervening into health problems and health disparities as they are conceptualized at a global level. The term is most frequently used to describe health issues and interventions in low-income or low- and middle-income countries and to describe the movement of medical goods, technology, expertise, and funding and development assistance from North to South or from wealthy countries to poorer ones. However, these problems and relations are structured by historical and contemporary inequities in how health outcomes are distributed and how health interventions are generated. Because the field has historical roots in colonial medicine and in international health efforts of earlier decades, global health issues have frequently centered on the infectious diseases that were hallmarks of these efforts. As a result, the term global health can signify a variety of conditions and practices. It is used to evoke certain diseases, especially but not only HIV/AIDS, tuberculosis, and malaria and other infectious diseases, as well as maternal-child and reproductive health and, increasingly, noninfectious diseases. It refers to concerns with (and efforts at ameliorating) disparities in the treatment of these conditions. And it describes interventions, largely enacted through nongovernmental or joint state-private coalitions, that are aimed at treating disease and/or ameliorating these health disparities within a framework that reflects and relies on broader inequalities in access to medical resources. Global health actors include a wide range of institutions including nongovernmental organizations (NGOs) and academic and medical organizations as well as corporations, public health agencies, and the state. Philanthropic organizations, medical schools and universities, NGOs and development agencies, private corporations and manufacturers of medical goods, as well as scholars, researchers, and physicians, have all worked to implement and define global health over time. Within this field, anthropologists have been centrally involved in defining global health through research activities that make health problems and disparities visible, through work as advocates or health actors working to ameliorate health issues, through work as educators teaching undergraduate, graduate, and medical students, and through critical reflection on the project of global health itself. This entry focuses attention on four aspects of the anthropology of global health, emphasizing 1) how anthropologists have understood the historical development of global health; 2) anthropological discussions of the politics, antipolitics, and biopolitics of global health as they impact theories of citizenship; 3) key themes in the ethnography of global health; and 4) the roles anthropologists have taken with regard to global health, including as practitioners and teachers.


Author(s):  
Zeba Zarin Ansari ◽  
◽  
S.V. Akhmatov ◽  

Water is an essential element for all the existing living beings. About 70% of the Earth is covered by water. All human beings need fresh drinking water. Without water no life is ever imagined on this blue planet. But life becomes difficult when many lives have to live on polluted water. According to WHO, 80% diseases are waterborne. In Delhi, different types of toxic chemical discharge have different effects on humans causing diseases like bacterial, viral or parasitic. Therefore, it is recommended to focus daily on the water quality of Delhi from destructive events. So, the present paper defines condition of water pollution and their solutions in the given research area.


Author(s):  
Soyab A Jamadar ◽  

Cleaning of the AC ducts is the need because it creates problems such as the bad indoor air quality which results in health issues and it also causes the large maintenance of the system. The uncleaned air ducts become home for fungi, dust and harmful microbial. The causes and effects of this thing are mentioned following. The AC ducts can be cleaned through various methodologies i.e. conventional and by using robots. In the conventional system, there is manual cleaning by using some equipment. Cleaning the ducts by using robots would be a good solution for this. Different types of robot systems i.e. crawling robot, articulated robot and inspection robot are deployed for the application. There are different types of robots and their equipment according to size and type of duct. The cleaning of rectangular shape ducts is quite difficult than others. Finally, it results that cleaning ducts is the most important thing and using robots is the best methodology for it.


1984 ◽  
Vol 19 (1) ◽  
pp. 87-100
Author(s):  
D. Prasad ◽  
J.G. Henry ◽  
P. Elefsiniotis

Abstract Laboratory studies were conducted to demonstrate the effectiveness of diffused aeration for the removal of ammonia from the effluent of an anaerobic filter treating leachate. The effects of pH, temperature and air flow on the process were studied. The coefficient of desorption of ammonia, KD for the anaerobic filter effluent (TKN 75 mg/L with NH3-N 88%) was determined at pH values of 9, 10 and 11, temperatures of 10, 15, 20, 30 and 35°C, and air flow rates of 50, 120, and 190 cm3/sec/L. Results indicated that nitrogen removal from the effluent of anaerobic filters by ammonia desorption was feasible. Removals exceeding 90% were obtained with 8 hours aeration at pH of 10, a temperature of 20°C, and an air flow rate of 190 cm3/sec/L. Ammonia desorption coefficients, KD, determined at other temperatures and air flow rates can be used to predict ammonia removals under a wide range of operating conditions.


2020 ◽  
Vol 21 (2) ◽  
pp. 97-109 ◽  
Author(s):  
Ana P. dos Santos ◽  
Tamara G. de Araújo ◽  
Gandhi Rádis-Baptista

Venom-derived peptides display diverse biological and pharmacological activities, making them useful in drug discovery platforms and for a wide range of applications in medicine and pharmaceutical biotechnology. Due to their target specificities, venom peptides have the potential to be developed into biopharmaceuticals to treat various health conditions such as diabetes mellitus, hypertension, and chronic pain. Despite the high potential for drug development, several limitations preclude the direct use of peptides as therapeutics and hamper the process of converting venom peptides into pharmaceuticals. These limitations include, for instance, chemical instability, poor oral absorption, short halflife, and off-target cytotoxicity. One strategy to overcome these disadvantages relies on the formulation of bioactive peptides with nanocarriers. A range of biocompatible materials are now available that can serve as nanocarriers and can improve the bioavailability of therapeutic and venom-derived peptides for clinical and diagnostic application. Examples of isolated venom peptides and crude animal venoms that have been encapsulated and formulated with different types of nanomaterials with promising results are increasingly reported. Based on the current data, a wealth of information can be collected regarding the utilization of nanocarriers to encapsulate venom peptides and render them bioavailable for pharmaceutical use. Overall, nanomaterials arise as essential components in the preparation of biopharmaceuticals that are based on biological and pharmacological active venom-derived peptides.


2020 ◽  
Vol 12 ◽  
Author(s):  
Nihar Ranjan Biswal

Background: Surfactant adsorption at the interfaces (solid–liquid, liquid–air, or liquid–liquid) is receiving considerable attention from a long time due to its wide range of practical applications. Objective: Specifically wettability of solid surface by liquids is mainly measured by contact angle and has many practical importances where solid–liquid systems are used. Adsorption of surfactants plays an important role in the wetting process. The wetting behaviours of three plant-based natural surfactants (Reetha, Shikakai, and Acacia) on the glass surface are compared with one widely used nonionic synthetic surfactant (Triton X-100) and reported in this study. Methods: The dynamic contact angle study of three different types of plant surfactants (Reetha, Shikakai and Acacia) and one synthetic surfactant (Triton X 100) on the glass surface has been carried out. The effect of two different types of alcohols such as Methanol and amyl alcohol on wettability of shikakai, as it shows little higher value of contact angle on glass surface has been measured. Results: The contact angle measurements show that there is an increase in contact angle from 47° (pure water) to 67.72°, 65.57°, 68.84°, and 68.79° for Reetha, Acacia, Shikakai, and Triton X-100 respectively with the increase in surfactant concentration and remain constant at CMC. The change in contact angle of Shikakai-Amyl alcohol mixtures are slightly different than that of methanol-Shikakai mixture, mostly there is a gradual increase in contact angle with the increasing in alcohol concentration. Conclusion: There is no linear relationship between cos θ and inverse of surface tension. There was a linear increase in surface free energy results with increase in concentration as more surfactant molecules were adsorbing at the interface enhancing an increase in contact angle.


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