A 10-Year Story: the Water for Life Decade 2005
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Wastewater Technology Fact Sheet: Ammonia Stripping
United States Office of Water EPA 832-F-00-019 Environmental Protection Washington, D.C. September 2000 Agency Wastewater Technology Fact Sheet Ammonia Stripping DESCRIPTION Ammonia stripping is a simple desorption process used to lower the ammonia content of a wastewater stream. Some wastewaters contain large amounts of ammonia and/or nitrogen-containing compounds that may readily form ammonia. It is often easier and less expensive to remove nitrogen from wastewater in the form of ammonia than to convert it to nitrate-nitrogen before removing it (Culp et al., 1978). Ammonia (a weak base) reacts with water (a weak acid) to form ammonium hydroxide. In ammonia stripping, lime or caustic is added to the wastewater until the pH reaches 10.8 to 11.5 standard units which converts ammonium hydroxide ions to ammonia gas according to the following reaction(s): + - NH4 + OH 6 H2O + NH38 Source: Culp, et. al, 1978. Figure 1 illustrates two variations of ammonia FIGURE 1 TWO TYPES OF STRIPPING stripping towers, cross-flow and countercurrent. In TOWERS a cross-flow tower, the solvent gas (air) enters along the entire depth of fill and flows through the packing, as the alkaline wastewater flows it may be more economical to use alternate downward. A countercurrent tower draws air ammonia removal techniques, such as steam through openings at the bottom, as wastewater is stripping or biological methods. Air stripping may pumped to the top of a packed tower. Free also be used to remove many hydrophobic organic ammonia (NH3) is stripped from falling water molecules (Nutrient Control, 1983). droplets into the air stream, then discharged to the atmosphere. -
Ozonedisinfection.Pdf
ETI - Environmental Technology Initiative Project funded by the U.S. Environmental Protection Agency under Assistance Agreement No. CX824652 What is disinfection? Human exposure to wastewater discharged into the environment has increased in the last 15 to 20 years with the rise in population and the greater demand for water resources for recreation and other purposes. Disinfection of wastewater is done to prevent infectious diseases from being spread and to ensure that water is safe for human contact and the environment. There is no perfect disinfectant. However, there are certain characteristics to look for when choosing the most suitable disinfectant: • Ability to penetrate and destroy infectious agents under normal operating conditions; • Lack of characteristics that could be harmful to people and the environment; • Safe and easy handling, shipping, and storage; • Absence of toxic residuals, such as cancer-causing compounds, after disinfection; and • Affordable capital and operation and maintenance (O&M) costs. What is ozone disinfection? One common method of disinfecting wastewater is ozonation (also known as ozone disinfection). Ozone is an unstable gas that can destroy bacteria and viruses. It is formed when oxygen molecules (O2) collide with oxygen atoms to produce ozone (O3). Ozone is generated by an electrical discharge through dry air or pure oxygen and is generated onsite because it decomposes to elemental oxygen in a short amount of time. After generation, ozone is fed into a down-flow contact chamber containing the wastewater to be disinfected. From the bottom of the contact chamber, ozone is diffused into fine bubbles that mix with the downward flowing wastewater. See Figure 1 on page 2 for a schematic of the ozonation process. -
Introduction to Co2 Chemistry in Sea Water
INTRODUCTION TO CO2 CHEMISTRY IN SEA WATER Andrew G. Dickson Scripps Institution of Oceanography, UC San Diego Mauna Loa Observatory, Hawaii Monthly Average Carbon Dioxide Concentration Data from Scripps CO Program Last updated August 2016 2 ? 410 400 390 380 370 2008; ~385 ppm 360 350 Concentration (ppm) 2 340 CO 330 1974; ~330 ppm 320 310 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 Year EFFECT OF ADDING CO2 TO SEA WATER 2− − CO2 + CO3 +H2O ! 2HCO3 O C O CO2 1. Dissolves in the ocean increase in decreases increases dissolved CO2 carbonate bicarbonate − HCO3 H O O also hydrogen ion concentration increases C H H 2. Reacts with water O O + H2O to form bicarbonate ion i.e., pH = –lg [H ] decreases H+ and hydrogen ion − HCO3 and saturation state of calcium carbonate decreases H+ 2− O O CO + 2− 3 3. Nearly all of that hydrogen [Ca ][CO ] C C H saturation Ω = 3 O O ion reacts with carbonate O O state K ion to form more bicarbonate sp (a measure of how “easy” it is to form a shell) M u l t i p l e o b s e r v e d indicators of a changing global carbon cycle: (a) atmospheric concentrations of carbon dioxide (CO2) from Mauna Loa (19°32´N, 155°34´W – red) and South Pole (89°59´S, 24°48´W – black) since 1958; (b) partial pressure of dissolved CO2 at the ocean surface (blue curves) and in situ pH (green curves), a measure of the acidity of ocean water. -
Global Turkey in Europe. Political, Economic, and Foreign Policy
ISSN 2239-2122 9 IAI Research Papers The EU is changing, Turkey too, and - above all - there is systemic change and crisis all G round, ranging from economics, the spread of democratic norms and foreign policy. LOBAL The IAI Research Papers are brief monographs written by one or N.1 European Security and the Future of Transatlantic Relations, This research paper explores how the EU and Turkey can enhance their cooperation in more authors (IAI or external experts) on current problems of inter- T edited by Riccardo Alcaro and Erik Jones, 2011 URKEY GLOBAL TURKEY national politics and international relations. The aim is to promote the political, economic, and foreign policy domains and how they can find a way out of the stalemate EU-Turkey relations have reached with the lack of progress in accession greater and more up to date knowledge of emerging issues and N. 2 Democracy in the EU after the Lisbon Treaty, IN trends and help prompt public debate. edited by Raaello Matarazzo, 2011 negotiations and the increasing uncertainty over both the future of the European project E after the Eurozone crisis and Turkey’s role in it. UROPE IN EUROPE N. 3 The Challenges of State Sustainability in the Mediterranean, edited by Silvia Colombo and Nathalie Tocci, 2011 A non-profit organization, IAI was founded in 1965 by Altiero Spinel- li, its first director. N. 4 Re-thinking Western Policies in Light of the Arab Uprisings, SENEM AYDIN-DÜZGIT is Assistant Professor at the Istanbul Bilgi University and Senior POLITICAL, ECONOMIC, AND FOREIGN POLICY edited by Riccardo Alcaro and Miguel Haubrich-Seco, 2012 Research Affiliate of the Istanbul Policy Centre (IPC). -
National Primary Drinking Water Regulations
National Primary Drinking Water Regulations Potential health effects MCL or TT1 Common sources of contaminant in Public Health Contaminant from long-term3 exposure (mg/L)2 drinking water Goal (mg/L)2 above the MCL Nervous system or blood Added to water during sewage/ Acrylamide TT4 problems; increased risk of cancer wastewater treatment zero Eye, liver, kidney, or spleen Runoff from herbicide used on row Alachlor 0.002 problems; anemia; increased risk crops zero of cancer Erosion of natural deposits of certain 15 picocuries Alpha/photon minerals that are radioactive and per Liter Increased risk of cancer emitters may emit a form of radiation known zero (pCi/L) as alpha radiation Discharge from petroleum refineries; Increase in blood cholesterol; Antimony 0.006 fire retardants; ceramics; electronics; decrease in blood sugar 0.006 solder Skin damage or problems with Erosion of natural deposits; runoff Arsenic 0.010 circulatory systems, and may have from orchards; runoff from glass & 0 increased risk of getting cancer electronics production wastes Asbestos 7 million Increased risk of developing Decay of asbestos cement in water (fibers >10 fibers per Liter benign intestinal polyps mains; erosion of natural deposits 7 MFL micrometers) (MFL) Cardiovascular system or Runoff from herbicide used on row Atrazine 0.003 reproductive problems crops 0.003 Discharge of drilling wastes; discharge Barium 2 Increase in blood pressure from metal refineries; erosion 2 of natural deposits Anemia; decrease in blood Discharge from factories; leaching Benzene -
Workplan 2018
Workplan 2018 Background The World Water Day campaign aims to inform and engage people worldwide to support and take action on water-related issues in various contexts. The theme for 2018 is ‘Nature for Water’ and will show the potential of nature-based solutions for water and how they can be considered for water management policy and practice. The campaign is timely thanks to public discourse around sustainability and shared concern and conviction about balancing the three dimensions of sustainable development. In addition to its goals of establishing water and sanitation as current and future priority issues, UN- Water has set the following operative goals for its campaigns: Inspire actions around the world to maximize awareness; Federate UN-Water Members and Partners’ actions and thereby strengthen the voice of the UN system on sanitation; and, Increase the depth of knowledge on water-related challenges and links. 2018 objectives 1. Inform and inspire people to take action and share their personal connection to water and nature. Target Audience: Public at large with a special focus on concerned millennials; the ‘worried middle’ (i.e those who are neither advocates nor disengaged). 2. Increase policy makers’ understanding of the applicability of nature-based solutions and galvanize actions toward their increased uptake. Target Audience: Policy and technical advisors, national and local authorities. 3. Encourage further research on nature-based solutions among academia and the business sector Target audience: Researchers, donor community, business sector Workplan 1. Inform and inspire people to take action and share their personal connection to water and nature. Through a personal action-oriented digital campaign, UN-Water will provide information and engagement material available online. -
51. Astrobiology: the Final Frontier of Science Education
www.astrosociety.org/uitc No. 51 - Summer 2000 © 2000, Astronomical Society of the Pacific, 390 Ashton Avenue, San Francisco, CA 94112. Astrobiology: The Final Frontier of Science Education by Jodi Asbell-Clarke and Jeff Lockwood What (or Whom) Are We Looking For? Where Do We Look? Lessons from Our Past The Search Is On What Does the Public Have to Learn from All This? A High School Curriculum in Astrobiology Astrobiology seems to be all the buzz these days. It was the focus of the ASP science symposium this summer; the University of Washington is offering it as a new Ph.D. program, and TERC (Technical Education Research Center) is developing a high school integrated science course based on it. So what is astrobiology? The NASA Astrobiology Institute defines this new discipline as the study of the origin, evolution, distribution, and destiny of life in the Universe. What this means for scientists is finding the means to blend research fields such as microbiology, geoscience, and astrophysics to collectively answer the largest looming questions of humankind. What it means for educators is an engaging and exciting discipline that is ripe for an integrated approach to science education. Virtually every topic that one deals with in high school science is embedded in astrobiology. What (or Whom) Are We Looking For? Movies and television shows such as Contact and Star Trek have teased viewers with the idea of life on other planets and even in other galaxies. Illustration courtesy of and © 2000 by These fictional accounts almost always deal with intelligent beings that have Kathleen L. -
A History of the Citizen Watch Company, from the Pages of Watchtime Magazine
THE WORLD OF FINE WATCHES SPOTLIGHT www.watchtime.com A HISTORY OF THE CITIZEN WATCH COMPANY, FROM THE PAGES OF WATCHTIME MAGAZINE CCIITTIIZZEENN THe HisTory of ciTizen One of the original Citizen pocket watches that went on THE sale in December 1924 CITIZEN WATCH STORY How a Tokyo jeweler’s experiment in making pocket watches 84 years ago led to the creation of a global watch colossus n the 1920s, the young Emperor of Japan, than the imports. To that end, Yamazaki found - Goto. The mayor was a friend of Yamazaki’s. Hirohito, received a gift that reportedly de - ed in 1918 the Shokosha Watch Research Insti - When the fledgling watch manufacturer was I lighted him. The gift was from Kamekichi tute in Tokyo’s Totsuka district. Using Swiss ma - searching for a name for his product, he asked Yamazaki, a Tokyo jeweler, who had an ambi - chinery, Yamazaki and his team began experi - Goto for ideas. Goto suggested Citizen. A tion to manufacture pocket watches in Japan. menting in the production of pocket watches. watch is, to a great extent, a luxury item, he ex - The Japanese watch market at that time By the end of 1924, they began commercial plained, but Yamazaki was aiming to make af - was dominated by foreign makes, primarily production of their first product, the Caliber fordable watches. It was Goto’s hope that every Swiss brands, followed by Americans like 16 pocket watch, which they sold under the citizen would benefit from and enjoy the time - Waltham and Elgin. Yamazaki felt the time brand name Citizen. -
Dynamics and Control of Resistive Wall Modes with Magnetic Feedback Control Coils: Experiment and Theory
1 IAEA-CN-116 EX/P5-13 Dynamics and Control of Resistive Wall Modes with Magnetic Feedback Control Coils: Experiment and Theory M. E. Mauel, J. Bialek, A. H. Boozer, C. Cates, R. James, O. Katsuro-Hopkins, A. Klein, Y. Liu, D. A. Maurer, D. Maslovsky, G. A. Navratil, T. S. Pedersen, M. Shilov, and N. Stillits Department of Applied Physics and Applied Mathematics Columbia University, New York, NY 10027, USA e-mail contact of main author: [email protected] Abstract. Fundamental theory, experimental observations, and modeling of resistive wall mode (RWM) dynamics and active feedback control are reported. In the RWM, the plasma responds to and interacts with external current-carrying conductors. Although this response is complex, it is still possible to construct simple but accurate models for kink dynamics by combining separate determinations for the external currents, using the VALEN code, and for the plasma’s inductance matrix, using an MHD code such as DCON. These computations have been performed for wall-stabilized kink modes in the HBT-EP device, and they illustrate a remarkable feature of the theory: when the plasma’s inductance matrix is dominated by a single eigenmode and when the surrounding current-carrying structures are properly characterized, then the resonant kink response is represented by a small number of parameters. In HBT-EP, RWM dynamics are studied by programming quasi-static and rapid “phase-flip” changes of the external magnetic perturbation and directly measuring the plasma response as a function of kink stability and plasma rotation. The response evolves in time, is easily measured, and involves excitation of both the wall-stabilized kink and the RWM. -
Overview Release
Chicago Architecture Biennial’s Fourth Edition, The Available City Opens to the Public on Friday, September 17 CHICAGO (August 25, 2021) – The fourth edition of the Chicago Architecture Biennial (CAB) will open to the public on September 17, responding to an urban design framework that proposes connecting community residents, architects, and designers to develop and create spaces that reflect the needs of communities and neighborhoods. Over 80 contributors from more than 18 countries will respond to this framework through site-specific architectural projects, exhibitions, and programs across eight neighborhoods in Chicago and in the digital sphere. Curated by the Biennial’s 2021 Artistic Director—designer, researcher, and educator David Brown—The Available City will present projects and programs that ask and respond to the question of who gets to participate in the design of the city by exploring new perspectives and approaches to policies. The Available City illuminates the potential for immediate new possibilities, highlights improvisational organizers of the city, and underscores the exponential impact of small elements in aggregate. The Biennial is free and open to the public beginning on Friday, September 17. It will be on view at sites and in locations throughout the city, activated through in-person and online programming through December 18, 2021. Mayor Lori E. Lightfoot commented, “The Biennial always represents a remarkable time for our city, when residents, visitors, cultural organizations, and businesses come together to explore new ideas and potential for Chicago and cities worldwide. It is inspiring to see the projects and ideas developed by Chicago residents and the contributors highlighting the potential for vacant spaces. -
World Water Day 2021 Campaign Guide
World Water Day 2021 campaign guide The build-up to World Water Day 2021 has begun! This year, we are starting with a digital campaign to hear what people around the world are saying about water. We need your help to spark conversations among your networks. Thank you for playing your part. What is World Water Day? World Water Day, held on 22 March every year since 1993, is an annual United Nations Observance focusing on the importance of freshwater. What is the aim of World Water Day? World Water Day celebrates water and raises awareness of the 2.2 billion people living without access to safe water. It is about taking action to tackle the global water crisis and achieving Sustainable Development Goal 6: water and sanitation for all by 2030. Who organizes World Water Day? Every year, UN-Water — the UN’s coordination mechanism on water and sanitation — sets the theme for World Water Day. What is World Water Day 2021 all about? The theme of World Water Day 2021 is valuing water. Beyond the issues of pricing, this topic includes the environmental, social and cultural value people place on water. For instance, in daily life, water can mean health, hygiene, dignity and productivity. In cultural, religious and spiritual places, water can mean a connection with creation or community. And in natural spaces, water can mean peace and preservation. Water means different things to different people in different settings. What is the purpose of the digital campaign? Taking place on social media, from now until the end of December, the digital campaign aims to generate conversations – to gather as many opinions and comments from people around the world about water and what it means to them. -
Radioactive Waste Management Committee
Radioactive Waste Management Committee FSC Ten-year Anniversary Colloquium PRESENTATIONS : Day 2: Afternoon 15 September 2010 OECD Headquarters Paris, France OECD Nuclear Energy Agency Le Seine Saint-Germain - 12, boulevard des Îles F-92130 Issy-les-Moulineaux, France Tel. +33 (0)1 45 24 82 00 - Fax +33 (0)1 45 24 11 10 Internet: www.nea.fr N U C L E A R • E N E R G Y • A G E N C Y Inclusive Governance of RWM Is it here ? How far does it reach ? Gilles Hériard Dubreuil ANCCLI; Mutadis FSC 10th Anniversary 15/09/2010 1 Outline of Presentation Inclusive Governance of RWM : Is it here ? What criteria ? COWAM’s decade of contribution to inclusive governance of RWM Reflections on Democratic Culture as a basis for Inclusive Governance Assessing the practical implementation of the AARHUS Convention in the nuclear sector Why should RWM institutions invest in Democratic Culture development ? 2 1 Inclusive Governance “Processes that engage the widest practicable variety of players in decision making around common affairs” Inclusive Governance of RWM : Is it here ? What criteria ? Inclusive Governance of RWM: a concept and a practice emerging in the context of crisis & societal resistance to former RWM programs Inclusive governance processes have been developed and tested in the past decade in several countries How shall we assess the impact of this trend of experimentation ? Has it contributed to a sustainable change towards Inclusive Governance ? 4 2 Inclusive Governance processes with a small “p” Usually in the context of a given decision-making Process on RWM Implemented in a limited period of time Focussing on the result of the decision itself (at local level in the case of siting) Short-term perspective (months, years) Quality of the decision-making procedure (e.g.