Wastewater as a Source of Energy, Nutrients, and Service Water

Treatise on Water Science

Volumn 4, Issue , 2011, Pages 337-375

  Cornel, P ^a   Meda, A ^a   Bieker, S ^a  

^a DARMSTADT UNIVERSITY OF TECHNOLOGY   (Germany)

Author keywords

Aerobic anaerobic treatment; Caloric heat; Energy efficiency and recovery; Energy intensity; Fit for purpose; Green house gas emissions; Greywater treatment; Integrated systems; Intra urban water reuse; Nutrient recovery; Resource conservation; Semicentralized systems; System scale; Water reuse; Water scarcity

Indexed keywords

EID: 84861599831     PISSN: None     EISSN: None     Source Type: Book    
DOI: 10.1016/B978-0-444-53199-5.00092-0     Document Type: Chapter

References (133)

1. Allan T (1997) Virtual water: A long-term solution for water short Middle Eastern economies. Speech at British Association Festival of Science. University of Leeds, 09 November 1997.
2. Asano T. Water Reuse Issues, Technologies, and Applications 2007, McGraw-Hill, New York.
3. ATV-DVWK (2003) Bericht der ATV-DVWK Arbeitsgruppe Ak-1.1 "Phosphorrückgewinnung". Korrespondenz Abwasser Nr. 6. Hennef, Germany: GFA.
4. ATV-DVWK Rückbelastung aus der Schlammbehandlung - Verfahren zur Schlammwasserbehandlung 2005, DWA-Arbeitsgruppe AK-1.3 "Rückbelastung aus der Schlammbehandlung", GFA, Hennef, Germany.
5. ATV-DVWK A 131 Bemessung von einstufigen Belebungsanlagen 2000, ATV-DVWK Regelwerk, GFA, Hennef, Germany.
6. Barnard J. Elimination of eutrophication through resource recovery. Proceedings of the International Conference on Nutrient Recovery from Wastewater Streams 2009, IWA, Vancouver. K. Ashley, D. Mavinic, F. Koch (Eds.).
7. Bennett E., Carpenter S.P. Soup - the global phosphorus cycle. World Watch Magazine 2002, 15(2):24-32.
8. Berg U (2005) P-RoC - Ein Verfahren zur P-Rückgewinnung aus Abwässern durch Abscheidung von Calciumphosphat-Mineralphasen an Tobermorit. In: 75. Darmstädter Seminar - Rückgewinnung von Phosphor aus Abwasser und Klärschlamm. Schriftenreihe WAR, Nr. 167. Darmstadt, Germany.
9. Bfai (Bundesagentur für Aussenwirtschaft) (2008) Klärschlammlösungen in der VR China dringend gesucht. Ausschnitt der Datenbank Länder und Märkte; Solutions for sewage sludge treatment urgently needed. (accessed March 2010). http://www.service.gmx.net/de/cgi/derefer?TYPE=3&DEST=http%3A%2F%2Fwww.gtai.de%2FDE%2FContent%2F__SharedDocs%2FLinks-Einzeldokumente-Datenbanken%2Ffachdokument.html%3FfIdent%3DMKT200707178007http://www.gtai.de/DE/Content/__SharedDocs/Links-Einzeldokumente-Datenbanken/fachdokument.html?fIdent=MKT200707178007.
10. BGW/ATV-DVWK (2003) Marktdaten Abwasser 2003. Germany.
11. Bieker S, Cornel P, and Wagner M (2009) Semicentralized supply and treatment systems - integrated infrastructure solutions for fast growing urban areas. In: Conference Proceedings of the 6th IWA Leading Edge Conference on Water and Waste Water Technologies. Singapore, 22-26 June 2009.
12. Bieker S., Cornel P., Wagner M. Semicentralized supply and treatment systems - integrated infrastructure solutions for fast growing urban areas. Water Science and Technology 2010, 61(11):2905-2913.
13. BMBF (2006) Semizentrale Ver- und Entsorgungssysteme für urbane Räume Chinas. Subproject 1, project code 02WD0398, Final Report. German Ministry for Education and Research.
14. BMBF (2009) Wasserwiederverwendung - Sommer-/Winterbetrieb von Abwasserbehandlungsanlagen, project code 02WA0584, Final Report. German Ministry for Education and Research.
15. BMWi/BMU (2006) Energieversorgung für Deutschland: Statusbericht für den Energiegipfel am 3. April 2006. Bundesministerium für Wirtschaft und Technologie und Bundesministerium für Umwelt, Naturschutz und Reaktorsicherheit. (accessed March 2010). http://www.bmu.de/erneuerbare_energien/downloads/doc/36794.php.
16. Böcker K and Dichtl N (2001) Faulgasanfall und Verwertungsmöglichkeiten. Speech at seminar: Energieoptimierung in Abwasseranlagen. Bildungszentrum für die Entsorgungs- und Wasserwirtschaft (BEW). Essen, Germany, 8 March 2001.
17. Bodensee Wasserversorgung (2007) Wissensdurst, issue 2, August 2007. (accessed March 2010). http://www.zvbwv.de/de/wissensdurst.html.
18. Brauch HJ and Schmidt CK (2009) Uferfiltration - Eine Wirksame Barriere zur Entfernung von organischen Spurenstoffen. In: GWA Nr. 217 (ed.) Proceedings of the Conference 42. Essener Tagung, pp. 27/1-27/13. Aachen, Germany, 18-20 March 2009.
19. Cakir F.Y., Stenstrom M.K. Greenhouse gas production: A comparison between aerobic and anaerobic wastewater treatment technology. Water Research 2005, 39:4197-4203.
20. California Energy Commission (2005) Integrated Energy Policy Report 2005. (accessed March 2010). http://www.energy.ca.gov/2005publications/CEC-100-2005-007/CEC-100-2005-007-CMF.PDF.
21. Cornel P (2007) Semicentralized supply and treatment systems for fast growing urban areas. In: Huber H, Wilderer P, and Paris S (eds.) Water Supply and Sanitation for All - Obligation of the Water Professionals for Our Common Future. Berching: Hans Huber AG.
22. Cornel P and Meda A (2008a) Wasserwiederverwendung zur landwirtschaftlichen Bewässerung. GWF Wasser Abwasser 149 Nr. 13.
23. Cornel P., Meda A. Water reuse in Central Europe: The current situation. Water Reuse: An International Survey of Current Practice, Issues and Needs 2008, IWA, London. B. Jiménez, T. Asano (Eds.).
24. Cornel P., Schaum C. Phosphorus recovery from wastewater - needs, technologies and costs. Water Science and Technology 2009, 59(6):1069-1076.
25. Cornel P., Weber B. Water reuse for irrigation from waste water treatment plants with seasonal varied operation modes. Water Science and Technology 2004, 50(2):47-53.
26. Cornish GA and Lawrence P (2001) Informal irrigation in peri-urban areas: A summary of findings and recommendations. Report OD 144 HR, Wallingford/DFID.
27. Dockhorn T (2007) Stoffstrommanagement und Ressourcenökonomie in der kommunalen Abwasserwirtschaft. Postdoctoral lecture qualification, Institut für Siedlungswasserwirtschaft der Technischen Universität Braunschweig, issue 74.
28. Drewes J.E., Fox P., Jekel M. Occurrence of iodinated X-ray contrast media in domestic effluents and their fate during indirect potable reuse. Journal of Environmental Science and Health Part A 2001, 36:1633-1646.
29. DWA Assessment of Process Steps for the Treatment of Wastewater for Reuse 2008, DWA German Association for Water, Wastewater and Waste, GFA, Hennef, Germany.
30. Earthtrends (2009) Water Resources and Freshwater Ecosystems. (accessed March 2010). http://www.earthtrends.wri.org/searchable_db/index.php?theme=2.
31. EFMA (2000) Best Available Techniques for Pollution Prevention and Control in the European Fertilizer Industry Production of Ammonia, No. 1. Brussels: European Fertilizer Manufacturers' Association.
32. Emsley J. The phosphorus cycle. The Natural Environment and the Biogeochemical Cycles 1980, Springer, Berlin.
33. Emsley J. Phosphor - ein Element auf Leben und Tod 2001, Wiley, Weinheim, Germany.
34. Ensink J., Mahmood T., van der Hoek W., Raschid-Sally L., Amerasinghe F. A nationwide assessment of wastewater use in Pakistan: An obscure activity or a vitally important one?. Water Policy 2004, 6:197-206.
35. EPA (2004) Guidelines for Water Reuse. EPA/625/R-04/108.
36. Eurostat (2009) Water Use of Domestic Sector, Households. (accessed March 2010). http://www.epp.eurostat.ec.europa.eu/portal/page/portal/product_details/dataset?p_product_code=ENV_WATQ3IND.
37. FAO (2009) AQUASTAT. FAO's Information System on Water and Agriculture. (accessed March 2010). http://www.fao.org/nr/water/aquastat/dbase/index.stm.
38. Filippelli G.M. The Global Phosphorus Cycle 2002, 48. Mineralogical Society of America, Washington, DC.
39. Forth W, Henschler D, Rummel W, and Starke K (1996) Allgemeine und spezielle Pharmakologie und Toxikologie, 6th edn. Wissenschaftsverlag Mannheim/Leipzig/Wien/ Zürich.
40. Fox P., Naranaswamy K., Drewes J.E. Water quality transformations during soil aquifer treatment at the Mesa Northwest water reclamation plant, USA. Water Science and Technology 2001, 43(10):343-350.
41. FSO Statistisches Bundesamt: Statistisches Jahrbuch 2001 für die Bundesrepublik Deutschland 2001, Statistisches Bundesamt, Wiesbaden, Germany.
42. FSO Statistisches Bundesamt: Fachserie 19 Reihe 2.1 - Umwelt âffentliche Wasserversorgung und Abwasserbeseitigung 2009, Statistisches Bundesamt, Wiesbaden, Germany.
43. Galloway J.N., Aber J.D., Erisman J.W., et al. The nitrogen cascade. BioScience 2003, 53(4):341-356.
44. Genath B (2009) Verfahrenstechnik zur Nährstoff-Rückgewinnung. Wasserwirtschaft Wassertechnik (WWT). April 2009.
45. Giesen A, den Boer R, and Gaillard A (2005) Practical Experience with Recovery of Phosphates from Wastewater Using Crystallization Technology. Schriftenreihe WAR, 167. Darmstadt, Germany.
46. Günthert FW and Reicherter E (2001) Investitionskosten der Abwasserentsorgung, Oldenbourg Industustrieverlag München, Germany.
47. Haberkern B., Maier W., Schneider U. Steigerung der Energieeffizienz auf kommunalen Kläranlagen 2008, Umweltbundesamt, Dessau-Roßlau, Germany.
48. Hähnlein C (2008) Numerische Modellierung zur Betriebsoptimierung von Wasserteilnetzen. PhD Thesis, Schriftenreihe WAR, 197, Technische Universität Darmstadt, Germany.
49. Heinzmann B and Engel G (2005) Induced magnesium ammonia phosphate precipitation to prevent incrustations and measures for phosphorus recovery in the sludge chain of the wastewater treatment plant Waßmannsdorf. In: Conference on the Management of Residues Emanating from Water and Waste-Water Treatment. Johannesburg, South Africa, 9-12 August 2005.
50. IFA (1998) International Fertilizer Industry Association and United Nations Environment Program, The Fertilizer Industry, World Food Supplies and the Environment, Paris, France.
51. Imhoff K. Taschenbuch der Stadtentwässerung 2007, Oldenburg Industrieverlag, Munich. 30th edn.
52. IMWI Water Policy Briefing 2003, issue 9, IMWI, Colombo, Sri Lanka.
53. IPCC - Intergovernmental Panel on Climate Change (2007) Climate change 2007: Impacts, adaptation and vulnerability. Fourth Assessment Report, Summary for Policymakers, Working Group II of the IPCC. Brussels: IPCC.
54. Jeffrey P and Jefferson B (2004) Public receptivity regarding 'in-house' water recycling: Results from a UK survey. Paper Presented at the Enviro 2002 Convention and Exhibition and IWA 3rd World Water Congress. Melbourne, Australia, 7-12 April 2002.
55. Jiménez B. Irrigation in developing countries using wastewater. International Review for Environmental Strategies 2006, 6(2):229-250.
56. Water Reuse: An International Survey of Current Practice, Issues and Needs 2008, IWA, London. B. Jiménez, T. Asano (Eds.).
57. Jiménez B., Garduño H. Social, political and scientific dilemmas for massive wastewater reuse in the world. Navigating through Waters: Ethical Issues in the Water Industry 2001, American Water Works Association, Denver, CO. C.K. Davis, R.E. McGinn (Eds.).
58. Katalyse (2008) Institut für angewandte Umweltforschung - Umweltlexikon-Online. (accessed March 2010). http://www.umweltlexikon-online.de/fp/archiv/RUBlandwirtsrohstoffe/Nutzpflanzen.php.
59. Keicher K., Krampe J., Steinmetz H. Eigenenergieversorgung von Kläranlagen. Korrespondenz Abwasser 2008, 55(6):644-650.
60. Keller J (2008) From microbial fuel cells to bio-electrochemical systems: How to convert organic pollutants to electric energy and more. Speech at the IWA World Water Congress. Vienna, Austria, 8-12 September 2008.
61. Kley G, Adam C, Brenneis R, and Simon F-G (2005) Thermochemische Aufbereitung von Klärschlammaschen zu Phosphordüngern - Das EU-Projekt SUSAN. In: 75. Darmstädter Seminar - Rückgewinnung von Phosphor aus Abwasser und Klärschlamm. Schriftenreihe WAR, Nr. 167. Darmstadt, Germany.
62. Kollbach J.S., Grömping M. Stickstoffrückbelastung 1996, TK-Verlag, Neuruppin, Germany.
63. Kratz S (2004) Uran in Düngemitteln, Uran - Umwelt - Unbehagen. Statusseminar. Braunschweig, Germany, 14 October 2004.
64. Kroiss H. What is the potential for utilizing the resources in sludge?. Water Science and Technology 2004, 49(10):1-10.
65. Kroiss H (2006) Nutrient management from point source control to global perspective. Speech at the IWA World Water Congress and Exhibition. Beijing, China, 10-14 September 2006.
66. Kunst S, Klotz G, Ternes Th, and Wenzel A (2002) Endokrin wirksame Substanzen in Kläranlagen - Vorkommen, Verbleib und Wirkung. Arbeitsbericht der ATV-DVWK-Arbeitsgruppe IG-5.4 "Endokrin wirksame Stoffe". Hennef, Germany: GFA.
67. Larsen T.A., Gujer W. The concept of sustainable urban water management. Water Science and Technology 1997, 35(9):3-10.
68. Larsen TA and Lienert J (2007) Novaquatis Abschlussbericht. NoMix - Neue Wege in der Siedlungswasserwirtschaft. Eawag, 8600 Dübendorf, Schweiz.
69. Larsen T.A., Maurer M., Udert K.M., Lienert J. Nutrient cycles and resource management: Implications for the choice of wastewater treatment technology. Water Science and Technology 2007, 56(5):229-237.
70. Lazarova V., Bahri A. Water Reuse for Irrigation - Agriculture, Landscapes and Turf Grass 2005, CRC Press, Boca Raton, FL.
71. Lazarova V., Levine B., Sack J., et al. Role of water reuse for enhancing integrated water management in Europe and Mediterranean countries. Water Science and Technology 2001, 43(10):23-33.
72. Lfu (1998) Stromverbrauch auf Kommunalen Kläranlagen, Handbuch Wasser 4, Vol. 13. Karlsruhe, Germany: Landesanstalt für Umweltschutz Baden Wüttemberg.
73. Mantovani P, Asano T, Chang A, and Okun DA (2001) Management Practices for Nonpotable Water Reuse. WERF, Project Report 97-IRM-6.
74. Maurer M., Schwegler P., Larsen T.A. Nutrients in urine: Energetic aspects of removal and recovery. Water Science and Technology 2003, 48(1):37-46.
75. Meda A., Cornel P. Aerated biofilter with seasonal varied operation modes for the production of irrigation water. Water Science and Technology 2010, 61(5):1173-1181.
76. Meda A., Schaum C., Wagner M., Cornel P., Durth A. Treatment and quality of sewage sludge in Germany - results of a survey. Water Practice and Technology 2007, 2(1).
77. Müller J, Reinhardt M, Günther L, et al. (2005) Fundamentals and feasibility of nutrient recycling using the Seaborne process. Conference on the Management of Residues Emanating from Water and Waste-water Treatment. Johannesburg, South Africa, 09-12 August 2005.
78. Mundo K. Der Stickstoff und seine anorganischen Verbindungen. Chemische Technologie, Vol. 1: Anorganische Technologie 1970, 595-712. München: Carl Hanser. K. Winnacker, L. Küchler (Eds.).
79. MURL NRW Handbuch Energie in Kläranlagen 1999, Ministerium für Umwelt, Raumordnung und Landwirtschaft des Landes Nord-Rhein Westfalen, Düsseldorf (Germany).
80. Oaksford E.T. Artificial recharge: Methods, hydraulics, and monitoring. Artificial Recharge of Groundwater 1985, 69-127. Butterworth, Boston. T. Asano (Ed.).
81. openPR (2008) IFAT CHINA 2008: Lösungen für die Klärschlamm Flut. IFAT China 2008: solutions for staunch of sewage sludge (accessed March 2010). http://www.service.gmx.net/de/cgi/derefer?TYPE=3&DEST=http%3A%2F%2Fwww.openpr.de%2Fnews%2F172992%2FIFAT-CHINA-2008-Loesungen-fuer-die-Klaerschlamm-Flut.htmlhttp://www.openpr.de/news/172992/IFAT-CHINA-2008-Loesungen-fuer-die-Klaerschlamm-Flut.html.
82. Otterpohl R. Options for alternative types of sewerage and treatment systems directed to improvement of the overall performance. Water Science and Technology 2002, 45(3):149-158.
83. Otterpohl R., Grottker M., Lange J. Sustainable water and waste management in urban areas. Water Science and Technology 1997, 35(9):121-133.
84. Petzet S and Cornel P (2009) Phosphorus removal and recovery from sewage sludge as calcium phosphate by addition of calcium silicate hydrate compounds (CSH). In: Ashley K, Mavinic D, and Koch F (eds.) Proceedings of the International Conference on Nutrient Recovery from Wastewater Streams. Vancouver, Canada, 10-13 May 2009.
85. Petzet S and Cornel P (2010) Neue Wege des Phosphorrecyclings aus Klärschlammaschen KA - Abwasser, Abfall 57 Nr. 4. Hennef, Germany: GFA.
86. Pinnekamp J (2002) Phosphorrückgewinnung aus Abwasser und Klärschlamm. Korrespondenz Abwasser, 49. Jahrgang, Nr. 10. Hennef, Germany): GFA.
87. Pinnekamp J and Montag D (2005) Phosphorrückgewinnung aus überschussschlamm. In: 75. Darmstädter Seminar - Rückgewinnung von Phosphor aus Abwasser und Klärschlamm. Schriftenreihe WAR, Nr. 167, Darmstadt, Germany.
88. Prasad R, Britton A, Balzer B, and Schafran G (2007) Nutrient Recovery by Struvite Crystallization Process: Virginia Experience, WEFTEC, USA.
89. Prinzhorn P (2005) Phosphordünger aus Klärschlammaschen mit thermischer Schwermetallentfrachtung. In: 75. Darmstädter Seminar - Rückgewinnung von Phosphor aus Abwasser und Klärschlamm. Schriftenreihe WAR, Nr. 167. Darmstadt, Germany.
90. Reicherter E (2003) Untersuchungen zu Kennzahlen als Grundlage für Kostenbetrachtungen in der Abwasserentsorgung; Mitteillungen des Instituts für Wasserwesen der Universität der Bundeswehr München, Heft 84/ 2003; Institut für Wasserwesen; Oldenbourg-Industrieverlag; München.
91. Reiter P (2008) Reducing the Water Utility's Footprint Through Utility Sponsored End-Use Efficiency. Speech at the IWA World Water Congress Vienna 2008, 8-12 September 2008.
92. Richards IR and Johnston AE (2001) The effectiveness of different precipitated phosphates as sources of phosphorus for plants. Research Report CEEP, EFMA, Anglian Water UK, Thames Water UK and Berliner Wasserbetriebe.
93. Rödl & Partner (2006) Kennzahlenvergleich Wasserversorgung Baden-Württemberg, Ergebnisbericht für das Erhebungsjahr 2005. (accessed March 2010). http://www.roedl-benchmarking.de/downloads/berichtbw2005.pdf.
94. Rödl & Partner (2007) Effizienz- und Qualitätsuntersuchung der kommunalen Wasserversorgung in Bayern (EffWB) 2007, 3. Abschlussbericht. (accessed March 2010). http://www.roedl-benchmarking.de/downloads/BerichtBY2007.pdf.
95. Römer W., Samie I.F. Phosphordüngewirkung eisenhaltiger Klärschlämme. Journal of Plant Nutrition and Soil Science 2002, 165:83-91.
96. Römer W., Samie I.F. Eisenreiche Klärschlämme sind für das P-Recxcling im Ackerbau ungeeignet. Wasser und Boden 2002, 54(6):28-32.
97. Römer W (2006) Vergleichende Untersuchung der Phosphatverfügbarkeit von Produkten des P-Recyclings und bekannter Phosphatdünger. KA - Abwasser, Abfall 53 Nr. 5. Hennef, Germany: GFA.
98. Rosenwinkel K-H (2006) Biogas aus nachwachsenden Rohstoffen in Niedersachsen. Vortrag im Rahmen des Wasserwirtschaftlichen Kolloquiums des Instituts für Siedlungswasserwirtschaft an der Leibniz Universität Hannover am, 7 December 2006.
99. Ruhr-Universität Bochum (2005) Anforderungen an die Abwassertechnik in anderen Ländern, Report of the Project Export-oriented research and development on the fields of water supply and wastewater disposal, part II: Wastewater treatment and reuse, Vol. 1: Requirement an die wastewater technology in other countries, ISBN: 3-9810255-0-4.
100. Schaum C (2007) Verfahren für eine zukünftige Klärschlammbehandlung - Klärschlammkonditionierung und Rückgewinnung von Phosphor aus Klärschlammasche, PhD Thesis, Schriftenreihe WAR, Nr. 185, Technische Universität Darmstadt, Germany.
101. Schröder M. Klärschlamm als Energieträger. Korrespondenz Abwasser 2007, 54(10):1035-1040.
102. Schröder M., Schrenk G. Energiepotentiale der deutschen Wasserwirtschaft. Korrespondenz Abwasser 2008, 55(6):626-631.
103. Shizas I., Bagley D. Experimental determination of energy content of unknown organics in municipal wastewater streams. Journal of Energy Engineering 2004, 130(2):45-53.
104. Smit J., Nasr J. Urban agriculture for sustainable cities: Using wastes and idle land and water bodies as resources. Environment and Urbanization 1992, 4(2):141-152.
105. Steen I. Phosphorous availability in the 21st century; Management of a non renewable resource. Phosphorus and Potassium 1998, 217:25-31.
106. Stumm W., Morgan J.J. Aquatic Chemistry: Chemical Eqilibria and Rates in Natural Waters 1996, Wiley, New York. 3rd edn.
107. SUSAN (2008) (accessed March 2010). http://www.susan.bam.de/publications/newsletter_en_2005-12_susan.pdf.
108. Ternes T (2004) Assessment of technologies for the removal of pharmaceuticals and personal care products in sewage and drinking water facilities to improve the indirect potable water reuse. Final Report POSEIDON-Projekt. (accessed March 2010). http://www.eu-poseidon.com.
109. Tilley E., Gantenbein B., Khadka R., Zurbrügg C., Udert K.M. Social and economic feasibility of struvite recovery from urine at the community level in Nepal. International Conference on Nutrient Recovery from Wastewater Streams 2009, IWA, London, ISBN: 9781843392323. K. Ashley, D. Mavinic, F. Koch (Eds.).
110. UBA (2001) German Federal Environmental Agency, Grundsätze und Maßnahmen für eine vorsorgeorientierte Begrenzung von Schadstoffeinträgen in landbaulich genutzten Böden. Berlin: Umweltbundesamt Texte 59-01.
111. UBA (2008) German Federal Environmental Agency, press information No. 54/2008.
112. Ueno Y. Full scale struvite recovery in Japan. Phosphorus in Environmental Technology 2004, 496-506. IWA, London. E. Valsami-Jones (Ed.).
113. UNESCO (2006) Water - a shared responsibility. The United Nations World Water Development Report 2. Paris: UNESCO; New York: Berghahn Books.
114. UNESCO (2009) Water in a changing world. The United Nations World Water Development Report 3. Paris: UNESCO; London: Earthscan. (accessed March 2010). http://www.unesco.org/water/wwap/wwdr/wwdr3/index.shtml.
115. UN-HABITAT (2006) State of the World's Cities 2006/7. Nairobi, Kenya.
116. United Nations (2003) Water for people, water for life. The United Nations World Water Development Report. Barcelona: UNESCO. UN Water (2007): Coping with Water Scarcity - Every Drop Counts. World Water Day 2007, 22.03.2007. (accessed August 2010). http://www.worldwaterday07.org.
117. Urban I (2009) Anaerobe Kommunalabwasserbehandlung Einsatz und Bemessung von Reaktoren, Dissertation an der Fakultät Bauingenieurwesen und Geodäsie der Gottfried Wilhelm Leibniz Universität Hannover.
118. Venhuizen D. Paradigm shift: Decentralized wastewater systems may provide better management at less costs. Water Environment and Technology 1997, 9:49-52.
119. von Sperling M., Chernicharo C.A.d.L. Biological Wastewater Treatment in Warm Climate Regions 2005, ISBN: 1 84339 002 7, IWA, London.
120. Western Corridor (2009) (accessed March 2010). http://www.westerncorridor.com.au/sitedocument.aspx?docId=86.
121. WHO - World Health (2006) Guidelines for the Safe Use of Wastewater, Excreta and Grey-Water 4 vols, Geneva: World Health Organization.http://www.wssinfo.org/en/40_MDG2008.html.
122. WHO and UNICEF (2008) Progress on Drinking Water and Sanitation: Special Focus on Sanitation. New York: UNICEF and Geneva: WHO. Pageview: 2009/04/25 (accessed March 2010).
123. Wilderer P.A. UN water action decade: A unique challenge and chance for water engineers. Water Science and Technology 2005, 51(8):99-107.
124. Wilderer P.A. Sustainable water management in rural and peri-urban areas: What technology do we need to meet the UN Millenniums Development Goals?. Water Science and Technology 2005, 51(10):1-6.
125. Wilderer P.A., Schreff D. Decentralized and centralized wastewater management: A challenge for technology developers. Water Science and Technology 2000, 41(1):1-8.
126. Wilken R-D and Ternes Th (2001) Pharmaka- und Haushaltsrückstände in der Umwelt - Verhalten bei der Wasserwiederverwendung. Berichte aus Wassergüte- und Abfallwirtschaft. Heft 161, pp. 155-165. Munich: TU München.
127. Wittig E (2007) Erste Betriebserfahrungen der Klärschlammaufbereitungsanlage nach dem Seaborne-Verfahren/Gifhorner-Verfahren. 30. Erfahrungsaustausch der Lehrerinnen und Lehrer norddeutscher Kläranlagen- und Kanalnachbarschaften in Lüneburg (Germany).
128. Wu Q., Bishop P.L. Enhancing struvite crystallization from anaerobic supernatant 2004, NRC Research Press, http://jees.nrc.ca (accessed March 2010).
129. Zeeman G., Sanders W., Lettinga G. Feasibility of the on-site treatment of sewage and swill in large buildings. Water Science and Technology 2000, 41(1):9-16.
130. Zehnder A.J.B. Is water the first resource to control demographic development?. Food and Water: A Question of Survival 1997, 85-98. Forum Engelberg and vdf Hochschulverlag an der ETH Zürich, Zurich.
131. Zehnder A.J.B. Wasserressourcen und Bevölkerungsentwicklung. Wasser - essentielle Ressource und Lebensraum: Speech at Deutsche Akademie der Naturforscher Leopoldina, Halle-Saale 2001/046 in Halle 2001, Barth, Heidelberg. B. Parthier (Ed.).
132. Zehnder AJB (2003) Lecture at 27th International Exhibition-Congress on Chemical Engineering, Environmental Protection and Biotechnology. Frankfurt am Main, Germany, 21 May 2003.
133. Zessner M., Thaler S., Ruzicka K., Natho S., Kroiss H. Considerations on the importance of nutrition habits for the national nitrogen balance of Austria. Water Science and Technology 2010, 62(1):21-27.