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The risk of the Iraq’s marshlands disappearing is still high unless serious measures are adopted. Sewage discharge and irrigation-water pressure, compounded by the effects of climate changes and the extent of the planned dam construction in upstream countries, make this event more likely. Most of the marshlands’ inhabitants (Marsh Arabs) are suffering from lack of access to safe, clean water and lack of sanitation and are reluctant to look for better places to live and work. Constructed wetlands are among the best alternatives to solve their problems. The application of constructed wetlands to meet more stringent standards for wastewater reuse in agriculture contributes to mitigating the wastewater impact and irrigation pressure on the marshland ecosystem. It is here proposed that a 3.6 ha free-surface flow wetland  could manage the more stringent standard for reuse (15 mg/l) for BOD5 and TSS. A monitoring programme should nevertheless be associated with this kind of project to minimize health risks that may arise as a result of implementation. Despite the absence of studies that deal with wastewater reuse in irrigation projects at the national level (in Iraq), similar studies worldwide provide evidence of reuse possibilities. Furthermore, a performance requirements framework for wastewater reuse in irrigation projects such as the one suggested by Biswas, draws an approach to meet sustainable development indicators and would likely contribute to support and encourage the Marsh Arabs to settle back in their own areas.

Since 1989, the United States Federal Government and the State of Texas have targeted water and wastewater infrastructure development spending in the colonias to improve access to safe, reliable and adequate water supplies and wastewater service. Prior to widespread installation of piped, treated water infrastructure, waterborne illnesses attained levels only seen in developing countries. Despite the hundreds of millions of dollars that have been spent since 1989 on water and wastewater infrastructure improvements, roughly a quarter of colonias still lacked basic access to water and wastewater services. Previous research and assessments of where this government spending has been targeted have not evaluated all four largest funding sources together or demonstrated the impacts of water and wastewater infrastructure spending on either public health or the local economy. This report evaluates the first of these problems by analyzing government spending of these funding sources from 1996 to 2006 in Cameron, Hidalgo, and Starr counties. The report provides the history and context of the Texas colonia problem, discusses who provides water and wastewater services to the colonias, and describes the make-up of federal and state financial assistance to the colonias to develop their water and wastewater infrastructure. Conventional understandings of where government spending is going, for what, and to whom, are challenged by the data and analysis. Analysis results indicate greater spending on wastewater infrastructure improvements than water service in addition to greater allocation to municipal systems that extended service into colonia areas historically operated by water service corporations. Further research may build on this data as well as regional economic and epidemiological data to determine outcomes of the spending in quantitative terms using various impact assessment methodologies. This report concludes with a discussion of impact assessment.

Federal, state and private organizations have an urgent need for renewal of water and wastewater pipelines. A pertinent gap remains in understanding the relationship between deteriorated host-pipe conditions and renewal products cost and performance. This work provides a framework Decision-Support System that supports water and wastewater pipeline renewal-products. Various renewal products fit utility needs, and the optimization of this process streamlines the decision-making for renewal product selection. The Thesis has classified various factors for use in the renewal product decision-making process, and it provides the justification for use of the renewal decision-making factors in recommending a product. Pipeline problem definition, system causes, system requirements and renewal product characteristics are the key decision-making areas controlling the recommendation of a renewal product. The Decision-Support System framework is developed in a user-friendly Visual Basic forms, using Microsoft tools and evaluated for vendor information. The given framework allows the user to edit product information needs, factors affecting decision-making and the classification of each factor. This allows for ease in modification, utilization and collaborative understanding. The prototype framework An online hosting of the proposed framework will improve accessibility and validity of the renewal decision-making process. / Master of Science

Syftet med offentlig upphandling är att konkurrensutsätta marknader och skapa bästa möjligaaffär för de offentliga medel som den upphandlande myndigheten har till sitt förfogande.Offentlig upphandling ska ske med långsiktigt perspektiv och det finns verktyg för att tillse attett långsiktigt synsätt erhålls. Ett av dessa verktyg är livscykelkostnader (LCC) som beaktaren produkts anskaffning, ägande och avveckling. En produkt som har ett högtanskaffningsvärde men låga framtida kostnader, kan bli det mest kostnadseffektiva inköpet.LCC används för att göra en ekonomisk värdering av olika investeringsalternativ,diskonterade över produktens livslängd. Livscykelkostnader är ett synsätt som utforskar deolika investeringsalternativen och används aktivt för att föra en dialog mellan aktörerna iupphandlingsprocessen. Användningen av livscykelkostnader, kan antas vara till god hjälp för beslutsfattarna i vattenoch avloppsbranschen (VA) om de vill ta långsiktigt korrekta beslut. Problematiken är attingen har kartlagt hur ett livscykelkostnadsverktyg påverkar beslutsprocessen i offentligaupphandlingar inom VA-branschen och om det ger beställaren ett tydligt beslutsstöd. Dennastudie syftade därför att ta reda på hur livscykelkostnader används i praktiken och hur enanalys av livscykelkostnader bättre kan stödja beslutsprocessen för offentliga upphandlingarinom VA. Studien syftade även till att ta reda på hur ett livscykelkostnadsverktyg bör varautformat, genom att ge förslag på förutsättningar som måste tas hänsyn till. Detta examensarbete har utförts på uppdrag av Vattenreningsindustrins mötesplats (VARIM).En kvalitativ intervjustudie genomfördes, uppdelad i två faser, med 27 stycken intervjuer somgav upphov till ett rikt material. Intervjupersonerna hade fem olika aktörsroller: beställare,upphandlare, brukare, konsult och anbudsgivare. Studien avgränsades till att endast undersökafyra kommuntyper: storstäder, större städer, varuproducerande kommuner ochglesbygdskommuner. Resultatet från datainsamlingen analyserades med utgångspunkt i teorinfrån litteraturstudien. Resultaten visar att det finns ett stort behov av att använda livscykelkostnader iVA-upphandlingar. Det finns även stor potential för LCC-användande då majoriteten avintervjupersonerna ställde sig positiva till användandet av LCC, primärt vid upphandling avenergiförbrukande produkter eller processer. En stor resursskillnad identifierades mellanmindre beställare och större beställare, vilket resulterar i att de mindre beställarna inteanvänder livscykelkostnader som ett tilldelningskriterium. Resultaten pekar på attanvändningen av livscykelkostnader bidrar till ökad transparens i upphandlingsprocessen ochleder därför till en mindre risk för överprövning. Uppföljning av livscykelkostnader i kontraktär ett av de svåraste problemen visar studien. / The purpose of public procurement is to create competitive markets and generate the bestpossible deal for the contracting authority. Public procurement should aim for long-termperspective, and there are tools to ensure that a long-term view is obtained. One tool is lifecycle costs (LCC), where product acquisition, ownership and settlement are considered. Aproduct that has a high investment cost but low operating costs, may be the most costeffectivepurchase. LCC is used to achieve an economic evaluation of different investmentoptions, discounted over the lifetime of the product. Life-cycle costing is an approach thatexplores the various investment options and is used to as a basis of discussion by theparticipants in the procurement process. The use of life-cycle costs, are expected to be useful for decision makers in the water andwastewater industry if they want to take long-term correct decisions. The problem is that noone has studied how a life cycle cost tool affects the decision-making process in publicprocurement within the water and wastewater industry and if it gives the client a gooddecision making basis. This study therefore aimed to find out how life cycle costs are used inpractice and how these can be used in practice, as an aid in the decision making process forwater and wastewater procurements. The study also aimed to find out how a life cycle costtool should be designed, by giving suggestions on conditions that must be taken into account. This thesis has been carried out on behalf of The meeting place for the industry in watertreatment (VARIM), with the aim to investigate the procurement process within the water andwastewater trade. It also studies how life cycle costs are used in the process. The study wascarried out in two steps, consisting of qualitative interviews, 27 individual interviews gaverise to a rich material, which was subject to further analysis. The interviewees had fivedifferent roles in the procurement process: client, purchaser, user, consultant and bidder. Thestudy was limited to investigating four types of municipalities: large cities, major cities,manufacturing municipalities and rural municipalities. The results from the interviews wereanalyzed based on theory from the literature study, the results from the data collection wereanalyzed. The results show that life-cycle costs in water and wastewater procurement are needed. Thereis also great potential for LCC as the majority of respondents were in favor of the use of LCC,primarily in the procurement of energy-using products or processes. A great difference inaccess to resources was identified between smaller clients and major clients, resulting in thesmaller clients not using life-cycle costs as a criterion. Also the results indicate that the use oflife cycle costs contributes to greater transparency in the procurement process and thereforedecreases risk of appeals. The study shows that follow up of life cycle cost in a contract is oneof the most difficult problems in procurement.

Diss. Linköping : Univ., 2004. / Härtill 6 uppsatser.

Změny kvality vody v malých tocích, vyvolané vybudováním čistírny odpadních vod, představují doposud málo studované a přitom velmi aktuální téma současné hydrologie. Tato studie se zabývá popsáním těchto změn a faktorů, které je ovlivňují. Pro účely výzkumu bylo vybráno pět malých, zemědělsky využívaných povodí prvního řádu (čtyři povodí průměrně 6 km2 , jedno 16 km2 ). V každém zájmovém území byla vždy jedna vesnice od 640 do 2 500 obyvatel. Během 7 - 16 let trvajícího měsíčního monitoringu základních indikátorů kvality vody (O2, BSK5, CHSKCr, TOC, konduktivita, N-NH4, N-NO2, N-NO3, PC, P-PO4) byla zachycena stavba čistíren v obcích. Spolu s daty o účinnosti čistíren byly vyhodnoceny změny kvality vody v toku. Identifikované typy změn ukazují na problematické aspekty vývoje kvality vody v malých povodích. Kromě očekávaného rychlého a razantního snížení hodnot zátěže po výstavbě čistírny odpadních vod se vyskytují i odlišné projevy změn - pouze mírné snížení zátěže, stagnace, dokonce i zvýšení koncentrací sledovaných indikátorů. Mezi další typické změny patří navýšení hodnot 1-2 roky před uvedením čistírny do provozu a opožděná nitrifikace v toku způsobená nevhodným provozem čistírny. Mezi nejdůležitější faktory ovlivňující změny patří provoz čistírny, velikost průtoku recipientu, zemědělské...

The present paper summarizes the results of an application initiated within the framework of 35 years celebration of diplomatic relations between Germany and Vietnam. Within this context, the Technische Universität Dresden (TUD) and the Academy of Managers for Construction and Cities (AMC) jointly organized in 2010 a series of four thematic workshops. The one-day events have had similar structures and focused on main subjects of interest in the water sectors of both countries. In Vietnam, the workshops took place in Ha Noi, Hai Phong, Nha Trang and Vung Tau. Best practice examples about conceptualization, operation and maintenance of municipal water works provided an insight view into the challenges currently faced by the water service providers. TUD and AMC, together with their German and Vietnamese partners, addressed these issues by organizing the consecutive workshops under the umbrella of Vietnamese Water Supply and Sewerage Association (VWSA) and in coordination with the German Water Partnership (GWP). / Bài báo trình bày tóm tắt các kết quả của một đề xuất trong khuôn khổ kỷ niệm 35 năm quan hệ ngoại giao giữa CHLB Đức và Việt Nam. Theo đó, Trường Đại học Tổng hợp Kỹ Thuật Dresden (TUD) và Học viện Quản lý Xây dựng và Đô thị (AMC) đã phối hợp tổ chức một chuỗi bốn hội thảo chuyên đề trong năm 2010. Mỗi hội thảo thực hiện trong một ngày chương trình giống nhau và tập trung vào các chủ đề chính mà cả hai quốc gia đều quan tâm trong lĩnh vực nước. Phía Việt Nam, các hội thảo được tổ chức ở các thành phố Hà Nội, Hải Phòng, Nha Trang và Vũng Tàu. Nhiều bài thuyết trình về khái niệm hóa, vận hành và bảo dưỡng các công trình cấp nước đô thị đã thảo luận sâu về những thách thức mà các dịch vụ cấp nước đang gặp phải. TUD và AMC, kết hợp với các đối tác CHLB Đức và Việt Nam, đã ghi nhận các vấn đề phát sinh thông qua việc tổ chức nhiều hội thảo liên tục dưới sự bảo trợ của Hiệp hội Cấp thoát nước Việt Nam (VWSA) và Hiệp hội nước CHLB Đức (GWP).

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yes / In this paper, a one-dimensional mathematical model based on coupled differential and algebraic equations has been developed for analysing the separation mechanism of a N-nitrosamine in a spiral-wound reverse osmosis process. The model is based on Spiegler and Kedem’s work on mass transport and Darcy’s law and concentration polarization to analyse the pressure drop and mass transfer coefficient in the module feed channel respectively. The model is built using the gPROMS software suite and validated using N-nitrosamine rejection experimental data from the literature, obtained by using a pilot-scale cross-flow reverse osmosis filtration system. Analysis results derived from the model corroborate experimental data.