scholarly journals Desalination Technologies for Developing Countries: A Review

2018 ◽  
Vol 10 (1) ◽  
pp. 77-97 ◽  
Author(s):  
M. S. Islam ◽  
A. Sultana ◽  
A. H. M. Saadat ◽  
M. S. Islam ◽  
M. Shammi ◽  
...  
Keyword(s):  
Developing Countries ◽  
Fresh Water ◽  
Waste Heat ◽  
Anthropogenic Activities ◽  
Energy Requirement ◽  
Feed Water ◽  
Real Problem ◽  
Total Energy Consumption ◽  
Membrane Processes ◽  
The Cost

Fresh water is rapidly being exhausted due to natural and anthropogenic activities. The more and more interest is being paid to desalination of seawater and brackish water in order to provide fresh water. The suitability of these desalination technologies is based on several criteria including the level of feed water quality, source of energy, removal efficiency, energy requirement etc. In this paper, we presented a review of different desalination methods, a comparative study between different desalination methods, with emphasis on technologies and economics. The real problem in these technologies is the optimum economic design and evaluation of the combined plants in order to be economically viable for the developing countries. Distillation plants normally have higher energy requirements and unit capital cost than membrane plants and produces huge waste heat. Corrosion, scaling and fouling problems are more serious in thermal processes compare to the membrane processes. On the other hand, membrane processes required pretreatment of the feed water in order to remove particulates so that the membranes last longer. With the continuing advancement to reduce the total energy consumption and lower the cost of water production, membrane processes are becoming the technology of choice for desalination in developing countries.

Diffusion Driven Desalination for Simultaneous Fresh Water Production and Desulfurization

2010 ◽  
Vol 2 (3) ◽  
Author(s):  
Jameel R. Khan ◽  
James F. Klausner ◽  
Donald P. Ziegler ◽  
Srinivas S. Garimella
Keyword(s):  
Fresh Water ◽  
Fluid Transport ◽  
Transport Model ◽  
Waste Heat ◽  
Feed Water ◽  
Low Grade ◽  
Water Production ◽  
Air Stream ◽  
Mass Transport Model ◽  
Air Streams

The diffusion driven desalination (DDD) process has been previously introduced as a process for distilling water using low-grade waste heat. Here, a configuration of the DDD process is introduced for simultaneously distilling water and scrubbing sulfur dioxide (SO2) out of heated air streams, which is also known as flue gas desulfurization (FGD). This novel DDD/FGD process utilizes the low-grade waste heat carried in industrial discharge air streams. There are many applications, where the industrial air discharge also contains SO2, and in order to utilize the waste heat for the DDD process, the SO2 must be scrubbed out of the air stream. The two major components of the DDD process are the diffusion tower and the direct contact condenser. In the present work, a thermal fluid transport model for the DDD/FGD process, that includes SO2 scrubbing, is developed. It is an extension of the heat and mass transport model previously reported for the DDD process. An existing laboratory scale DDD facility was modified and tested with SO2 in the air stream and with seawater as the feed water to the diffusion tower. The experimental investigation has been completed to evaluate the fresh water production and SO2 scrubbing potential for the DDD/FGD process. The experimental results compare favorably with the model predictions. Chemical analysis on the condenser water demonstrates the capability of the DDD/FGD process to produce high quality fresh water using seawater as the input feed water to the process.

Innovative Diffusion Driven Desalination Process

2004 ◽  
Vol 126 (3) ◽  
pp. 219-225 ◽  
Author(s):  
James F. Klausner ◽  
Yi Li ◽  
Mohamed Darwish ◽  
Renwei Mei
Keyword(s):  
Fresh Water ◽  
Direct Contact ◽  
Production Efficiency ◽  
Waste Heat ◽  
Feed Water ◽  
Water Production ◽  
Vapor Mixture ◽  
Steam Power ◽  
Low Humidity ◽  
Feed Water Temperature

An innovative diffusion driven desalination (DDD) process is presented, and its performance based on thermodynamic considerations is thoroughly explored. The desalination is driven by water vapor saturating low humidity air flowing through a diffusion tower. Liquid water is condensed out of the air/vapor mixture in a direct contact condenser. The desalination process is suitable for operation at low temperatures and may be driven by waste heat with low exergy. It is demonstrated that the DDD process can yield a fresh water production efficiency of 4.5% with thermal energy consumption of 0.56 kWh per kilogram of fresh water production based on a feed water temperature of only 50°C. An example is discussed in which the DDD process utilizes waste heat from a 100 MW steam power plant to produce 1.51 million gallons of fresh water per day.

Modern opportunities for preparation of ultra-pure water for feeding high-performance boiler plants

2020 ◽  
pp. 74-84
Author(s):  
A.A. Filimonova ◽  
◽  
N.D. Chichirova ◽  
A.A. Chichirov ◽  
A.A. Batalova ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
High Performance ◽  
Waste Heat ◽  
Pure Water ◽  
Combined Cycle ◽  
Feed Water ◽  
Operational Characteristics ◽  
Treatment Equipment

The article provides an overview of modern high-performance combined-cycle plants and gas turbine plants with waste heat boilers. The forecast for the introduction of gas turbine equipment at TPPs in the world and in Russia is presented. The classification of gas turbines according to the degree of energy efficiency and operational characteristics is given. Waste heat boilers are characterized in terms of design and associated performance and efficiency. To achieve high operating parameters of gas turbine and boiler equipment, it is necessary to use, among other things, modern water treatment equipment. The article discusses modern effective technologies, the leading place among which is occupied by membrane, and especially baromembrane methods of preparing feed water-waste heat boilers. At the same time, the ion exchange technology remains one of the most demanded at TPPs in the Russian Federation.

Renovated Water Reuse from Rapid Infiltration System

1995 ◽  
Vol 30 (1) ◽  
pp. 111-114
Author(s):  
Duan ZhenBo ◽  
Wang Shang ShaoTang ◽  
Li RuQi ◽  
Wu XureQing ◽  
Gao Erjing
Keyword(s):  
Developing Countries ◽  
Wastewater Treatment ◽  
Water Reuse ◽  
The Cost

Abstract The use of renovated water from a rapid infiltration system for fish and duck farming was evaluated. It was concluded that the flesh of fish and duck was edible. The use of this approach is beneficial to the environment and economy, especially in developing countries. The production of fish and duck can offset the cost of wastewater treatment in many cases.

The cost implication of primary prevention in the HOPE 3 trial

2019 ◽  
Vol 5 (3) ◽  
pp. 266-271
Author(s):  
Andre Lamy ◽  
Eva Lonn ◽  
Wesley Tong ◽  
Balakumar Swaminathan ◽  
Hyejung Jung ◽  
...  
Keyword(s):  
Developing Countries ◽  
Primary Prevention ◽  
Cost Saving ◽  
Developed Countries ◽  
Sensitivity Analyses ◽  
Clinical Trial Registration ◽  
Pressure Lowering ◽  
The Cost ◽  
Care Costs ◽  
Country Specific

Abstract Aims The Heart Outcomes Prevention Evaluation-3 (HOPE-3) found that rosuvastatin alone or with candesartan and hydrochlorothiazide (HCT) (in a subgroup with hypertension) significantly lowered cardiovascular events compared with placebo in 12 705 individuals from 21 countries at intermediate risk and without cardiovascular disease. We assessed the costs implications of implementation in primary prevention in countries at different economic levels. Methods and results Hospitalizations, procedures, study and non-study medications were documented. We applied country-specific costs to the healthcare resources consumed for each patient. We calculated the average cost per patient in US dollars for the duration of the study (5.6 years). Sensitivity analyses were also performed with cheapest equivalent substitutes. The combination of rosuvastatin with candesartan/HCT reduced total costs and was a cost-saving strategy in United States, Canada, Europe, and Australia. In contrast, the treatments were more expensive in developing countries even when cheapest equivalent substitutes were used. After adjustment for gross domestic product (GDP), the costs of cheapest equivalent substitutes in proportion to the health care costs were higher in developing countries in comparison to developed countries. Conclusion Rosuvastatin and candesartan/HCT in primary prevention is a cost-saving approach in developed countries, but not in developing countries as both drugs and their cheapest equivalent substitutes are relatively more expensive despite adjustment by GDP. Reductions in costs of these drugs in developing countries are essential to make statins and blood pressure lowering drugs affordable and ensure their use. Clinical trial registration HOPE-3 ClinicalTrials.gov number, NCT00468923.

scholarly journals Impact of Patient Adherence and Test Performance on the Cost-Effectiveness of Cervical Cancer Screening in Developing Countries

2010 ◽  
Vol 20 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Rebecca B. Perkins ◽  
Sarah M. Langrish ◽  
Linda J. Stern ◽  
James F. Burgess ◽  
Carol J. Simon
Keyword(s):  
Cervical Cancer ◽  
Developing Countries ◽  
Cost Effectiveness ◽  
Cancer Screening ◽  
Cervical Cancer Screening ◽  
Test Performance ◽  
Patient Adherence ◽  
The Cost

scholarly journals Sustainable dietetic models in Europe: the Mediterranean diet as case study

2021 ◽  
Vol 31 (Supplement_3) ◽  
Author(s):  
F Scazzina
Keyword(s):  
Mediterranean Diet ◽  
Food System ◽  
Dietary Habits ◽  
Well Being ◽  
Overweight And Obesity ◽  
Lifestyle Changes ◽  
Total Energy Consumption ◽  
Adequate Diet ◽  
The Mediterranean ◽  
The Cost

Abstract More than five years since the global commitment to the 2030 Agenda for Sustainable Development, 690 million people lack sufficient food and economic projections suggest that the COVID-19 pandemic may add an additional 83 to 132 million people to the ranks of the undernourished. Meanwhile, 1.3 billion tons of food are wasted globally each year, utilizing 38% of total energy consumption in the global food system. Child and adult overweight and obesity are increasing in almost all countries, and on a global level the cost of a healthy diet is 60% higher than the cost of a nutrient adequate diet, and almost 5 times the cost of an energy sufficient diet. The Mediterranean Diet is one of the recognized models of healthy and sustainable diets. This model has proven to promote longevity and well-being, not only by considering specific food items and dietary patterns, but also taking into account the culture and the history of populations living in that region, as well as social aspects such as tradition and conviviality. Moreover, it is strongly tied to a gastronomic background that links health with enjoyment. This may be extremely important for the implementation of feasible programs for the prevention of chronic non communicable diseases. In fact, long lasting lifestyle changes are difficult to achieve and, although health motivations may lead to satisfactory dietary compliance in the short term, pleasure remains an important determinant of any dietary change that is intended to last. While keeping traditional dietary habits at European level, the main principles of the Mediterranean diet could be taken into account to identify key features that ensure both health benefits and sustainable impact on environment. Assessing the sustainability of these products can be an effective operational approach for preserving and promoting a Mediterranean-type dietary pattern in the European region.

scholarly journals A study on antibiotic prescription among the hospitalized pediatric patients at a referral center in Puducherry, India

2017 ◽  
Vol 4 (3) ◽  
pp. 700
Author(s):  
M. Bala Gopal ◽  
P. Thiyagarajan ◽  
Vinayagamoorthy Venugopal ◽  
Venkata Naveen Kumar
Keyword(s):  
Infectious Disease ◽  
Developing Countries ◽  
Antimicrobial Resistance ◽  
Significant Proportion ◽  
Antibiotic Use ◽  
Hospitalized Children ◽  
Referral Centre ◽  
Cross Sectional ◽  
Microbial Resistance ◽  
The Cost

Background: Antimicrobial resistance has reached to a significant proportion globally. This antimicrobial resistance increases the cost of health care in addition to the existing burden of the prevalence of infectious disease in developing countries. We need to have institutional protocols based on the standard guidelines. It is important for the clinician to use antibiotics only when it is necessary. The aim of the study was to analyze the rationality of the antibiotics used among the hospitalized children in the referral centre located in the rural area, to evaluate the pattern of antibiotics prescribed among the hospitalized children and to find out the factors associated with the usage of antibiotics among them.  Methods: Analytical, cross sectional study was performed on all patients admitted to the inpatient pediatric medical service at a referral centre situated in the rural part of the Puducherry, India during the period from July 2015 to June 2016. Results: 959 children were included in our study.607 children belong to less than 5 years of age group. Overall 60% of the children have received either oral or parenteral antibiotics. Based on the categorization of children as per the final clinical diagnosis children requiring antibiotic, can be used and not required are 13% (125), 38.6% (370) and 48.4% (464) respectively. Respiratory, gastrointestinal and systemic infectious diseases were the major group of cases admitted in our centre. Antibiotic use in respiratory and systemic infectious disease were maximum with 248 (70.1%) and 179 (71.6%) respectively. Among the antibiotics cephalosporin, penicillin group and azithromycin constitute more than 90% of the antibiotics prescribed cases.Conclusions: Overuse of antibiotic is universal and seen in both developed and developing countries. This increases the cost of treatment and increases the chances of microbial resistance. As per the W.H.O. recommendations surveillance system is required in all the hospitals to assess the antibiotic use and to monitor the prevalence of microbial resistance. 

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