Author: Annatoria Chinyama, Tendai Toma
Department of Civil and Water Engineering, National University of Science and Technology, P.O Box AC939, Ascot, Bulawayo, Zimbabwe
Understanding the Poor Performance of Urban Sewerage Systems – A Case of Coldstream High Density Suburbs, Chinhoyi, Zimbabwe
The population of Coldstream High Density Suburbs in Chinhoyi, Zimbabwe is increasing and the sewerage system shows signs of poor performance. The frequency of reported sewerage system blockages in the suburb increased from 43 per month to 65 per month between April 2012 and March 2013. The suburb has also been experiencing water shortages. An increasing population and low water supply versus overflowing sewage is a potential health risk.
The main objective of this paper was to investigate the causes of the sewer system poor performance. This was achieved by assessing the sewer system infrastructure as well as the operation of the system. The impact of the behaviour of residents on the performance of the system was also discussed. The main components of the infrastructure (manholes and sewers) were physically checked for soundness. The operation of the system was assessed by a hydraulic analysis of discharge, depth of flow and velocity of flow in the sewers. Questionnaires were used to investigate the impact of the behaviour of residents on the performance of the sewer system.
It was found that 4% of the components of the sewer system infrastructure were below standard and the collector main sewer was the one mainly affected. 68% of the sewers along the collector main had velocity of flow below 0.6m/s and all the sewers had depth of flow below 50%. Of the residents interviewed, 90% dumped solid wastes in the sewers and 43% did so because they were unaware of the impact.
It was concluded that the sewer system failed to meet standard because the sewer system fails to self-cleanse the solid waste dumped by residents in the sewers due to water shortages. It is recommended that the municipality raises awareness among residents and some of the infrastructure should be rehabilitated. more…
Location:Hamburg University of Technology. The campus is located in Hamburg-Harburg.
Dates: Wednesday, 28 – Saturday 31 August 2013
…An analysis of a former civilisation in the Amazon, nowadays Brazil, reveals concepts which enable a highly efficient handling of organic wastes. Terra Preta do Indio is the anthropogenic black soil that was produced by ancient cultures through the conversion of biowaste and faecal matter into long-term fertile soils. These soils have maintained high amounts of organic carbon even several thousand years after they were abandoned. It was recently discovered that around 10% of the originally infertile soils in the Amazon region was converted this way from around 7,000 until 500 years ago. Due to the accumulation of charred biomass and other organic residues, terra preta subsequently formed giving it a deep, distinctly dark and highly fertile soil layer.One of the surprising facts is that this soil is highly productive without adding fertiliser.
Recent research concludes that this culture had a superior sanitation and bio-waste system that was based on source separation of faecal matter, urine and clever additives particularly charcoal dust and treatment steps for the solids resulting in high yielding gardening. Additives included ground charcoal dust while the treatment and smell prevention started with anaerobic lactic-acid fermentation followed by vermicomposting.The generation of new Terra Preta (‘terra preta nova’) based on the safe treatment of human waste could be the basis for sustainable agriculture in the twenty-first century to produce food for billions of people….
Speakers / Sessions
Conference Keynote Dr. Haiko Pieplow (tbc)
Session 1: TP soils, soil fertility, organic farming
Key note from Bruno Glaser or Albrecht von Sydow (Germany) (tbc)
- T. Theuretzbacher (Austria): Investigation on Terra Preta like products on the german-Austrian market
- N. Andreev (Moldava): The effect of terra preta like substrate on germination and shoot growth of radish and parsley
- H. Factura (Philippines): Addressing Poor Sanitation and Generating Added Values through Terra Preta Sanitation
- B. Pelivanoski (Germany): Terra Pellet – an organic fertilizer inspired by terra preta
Session 2: TPS Applications, Quality of products, hygienic parameter, legislation, certification
Keynote presentation Prof. Srikanth Mutnuri (India) (tbc): Terra Preta as an Alternative for the Management of Sludge from Waste Water Treatment Plant
- S. Böttger (Germany): Terra Preta – production from sewage sludges of decentralised wastewater systems
- M. Stöckl (Germany): Vermicomposting of fecal matter and organic waste – a quality assessment of products
- D. Meier Kohlstock (Germany): The integration of Terra Preta Sanitation in European nutrient cycles – Options for alternative policies and economies
Session 3: Terra Preta Sanitation: toilet systems and designs / Logistic and operation / practical examples
Keynote speech Prof. Charlotte de Fraiture (Netherlands) (tbc)
- R. Wagner (Germany): New challenges of resource management in the Botanic Garden Berlin by producing and applying biochar substrates
- R. Kuipers (Netherlands): A socio-economic assessment of urine separation, with a reflection on the possibilities for Terra Preta Sanitation, for the recycling of nutrients to rural agriculture in the Philippines
- M. Bulbo (Ethiopia): TP application in Ethiopia
- R. Wolf (Germany): Application of Fermented Urine for build up of Terra Preta Humus in a Permaculture Park and Social Impact on the Community Involved
Session 4: Carbon composting of biowaste and excreta/Climate farming / wood gas technology for energy and char coal production / Pyrolysis vs. hydrothermal carbonization
Keynote presentation Prof. Zifu Li (China) (tbc): Energy balance analysis on the pyrolysis process of animal manure
T. Voss (Germany): Wood gasification in parallel flow fixbed gasifieres for combined energy and charcoal production – experiences from six years of operation (abstact follows)
- C. vom Eyser (Germany): Product quality of ç from sewage sludge in terms of micropollutants
- E. Someus (Sweden): Reducing mineral fertilisers and chemicals use in agriculture by recycling treated organic waste as compost and bio-char products
- J. Fingas (Germany): Climate farming – Practical experience from sub-Saharan Afrika
Session 5: Microbiology, sanitization and lactic acid fermentation
Keynote presentation Dr. Gina Itchon (Philippines): The Effectivity of the Terra Preta Sanitation (TPS) Process in the Elimination of Parasite Eggs in Fecal Matter: A Field Trial of TPS in Mindanao, Philippines
- A. Yemaneh (Germany/Ethiopia): Investigation of Low-Cost Sugar Supplement for Lactic Acid Fermentation of Human Excreta in Terra Preta Sanitation System
- A. Febriana (Indonesia): Faeces Treatment By Lactofermentation Process Based On Terra Preta Sanitation System Concept
- A. Walter (Austria): Microbial communities in charcoal and microbe amended composts
- F. Scheinemann (Germany): Sanitation and conservation of nutrients in cattle manure and sewage sludge by anerobic fermentation
Institute of Wastewater Management and Water Protection at TUHH
GFEU e. V.
Institute of Environmental Technology and Energy Economics at TUHH
German WASH Network
all details are from their site
This is a Wonderful 39 page Technical document on covering all aspect of Waterless Urinals and some variants that incorporates
the core ideas.
- Dr V M Chariar
- S Ramesh Sakthivel
This Resource Book is a guide that seeks to assist individuals, builders, engineers, architects, and policy makers in promoting waterless urinals and the benefits of harvesting urine for reuse through waterless urinals and urine diverting toilets.
Chapters cover a wide set of Waterless Urinals details
- Waterless Urinals
- 1.1 Advantages of Waterless Urinals and Reuse of Urine
- 1.2 Demerits of Conventional Urinals
- Functioning of Waterless Urinals
- 2.1 Sealant Liquid Traps
- 2.2 Membrane Traps
- 2.3 Biological Blocks
- 2.4 Comparative Analysis of Popular Odour Traps
- 2.5 Other Types of odour Traps
- 2.6 Installation and Maintenance of Waterless Urinals
- Innovative Urinal Designs
- 3.1 Public Urinal Kiosk 21
- 3.2 Green Waterless Urinal
- 3.3 Self Constructed Urinals
- Urine Diverting Toilets
- Urine Harvesting for Agriculture
- 5.1 Safe Application of Urine 3
- 5.2 Methods of Urine Application
- Other Applications of Urine
- Challenges and the Way Forward
- References and Further Reading
- Comparative analysis of popular odour traps
- Average chemical composition of fresh urine
- Recommended dose of urine for various crops
- Waterless urinals for men
- Schematic diagram showing functioning of urinals
- Sealant liquid based odour trap
- Urinals with sealant liquid based odour traps
- Flat rubber tube by Keramag and silicon membranes by Addicom
- LDPE membrane by Shital Ceramics
- Biological blocks
- Formwork used for fabrication of public urinal kiosk
- Reinforced concrete public urinal kiosk
- Drawing of public urinal kiosk established at IIT Delhi
- Green urinal established at IIT Delhi
- Plant bed of green urinal with perforated pipe
- Drawing of public urinal kiosk established at IIT Delhi
- Self constructed urinal Eco‐lily
- Squatting type urine diverting dry toilet with two chambers
- Urine diverting no mix toilet 27 Sectional view of a urine diverting dry toilet
- Deep injection of urine using soil injector
- Deep injection of urine using perforated pet bottles
- Use of fertilisation tank for applying urine through drip irrigation
- Manually operated reactor for recovery of struvite
- Schematic drawing of ammonia stripping from urine
“An odourless trap Zerodor which does not require replaceable parts or consumables resulting in low maintenance costs has been developed at IIT Delhi. This model is in final test stage yet to be made commercially available.” more on Zerodor…
Waterless Urinals do not require water for flushing and can be promoted at homes, institutions and public places to save water, energy and to harvest urine as a resource. Reduction in infrastructure required for water supply and waste water treatment is also a spinoff arising from installing waterless urinals. The concept, founded on the principles of ecological sanitation helps in preventing environmental damage caused by conventional flush sanitation systems.
In recent years, Human Urine has been identified as a potential resource that can be beneficially used for agriculture and industrial purposes. Human urine contains significant portion of essential plant nutrients such as nitrogen, phosphate and potassium excreted by human beings. Urine and faeces can also be separated employing systems such as urine diverting toilets. In the light of diminishing world’s phosphate and oil reserves which determine availability as well as pricing of mineral fertilisers, harvesting urine for reuse in agriculture assumes significant importance. Akin to the movement for harvesting rain water, urine harvesting is a concept which could have huge implications for resource conservation.
- UNICEF Report Highlights India’s Water Management Woes (circleofblue.org)
- SANITATION: Urban water woes (irinnews.org)
- From Water Problems to Water Solutions (slideshare.net)
- Lack of toilets, clean water costs world $260 bln a year – Liberian president (trust.org)
When looking at sanitation/wastewater treatment and making it economically feasible for more parts of the world, this is very interesting research. Some will say it has roots in the fact that there is “gold” in out crap…
Related links to this research:
…On May 1, a panel of judges awarded the $100,000 National University Clean Energy Business Challenge prize to the Stanford team for its project to convert nitrogen waste into nitrous oxide that is then used for clean power generation….
A new process for the removal of nitrogen from wastewater is introduced. The process involves three steps: (1) partial nitrification of NH4+ to NO2−; (2) partial anoxic reduction of NO2− to N2O; and (3) N2O conversion to N2 with energy recovery by either catalytic decomposition to N2 and O2 or use of N2O to oxidize biogas CH4. Steps 1 and 3 have been previously established at full-scale. Accordingly, bench-scale experiments focused on step 2. Two strategies were evaluated and found to be effective: in the first, Fe(II) was used to abiotically reduce NO2− to N2O; in the second, COD stored as polyhydroxybutyrate (PHB) was used as the electron donor for partial heterotrophic reduction of NO2− to N2O. ….
Normally, we want to discourage these gases from forming,” said Craig Criddle, a professor of civil and environmental engineering and senior fellow at the Woods Institute for the Environment at Stanford. “But by encouraging the formation of nitrous oxide, we can remove harmful nitrogen from the water and simultaneously increase methane production for use as fuel.
- Total N2O emissions-which are believed to come primarily from nitrogen fertilizers used in agricultural production-would account for about 8 percent of California’s total greenhouse gas emissions. (familysurvivalprotocol.com)
- 1st International IWA Conference on Holistic Sludge Management (washlink.wordpress.com)
- Major Advance in Generating Electricity From Wastewater (wakingtimes.com)
- Major Advance in Generating Electricity From Wastewater (myscienceacademy.org)
- The Final Frontier of Water and Wastewater Treatment: Sludge Management Equipment Market Set to Reach $9.9 Billion by 2017 (prweb.com)
6-8 May 2013
The purpose of this conference is to provide a forum for researchers and practitioners to exchange the latest developments in sludge management.It will give possibilities to examine and discuss the different challenges connected to resource recovery through treatment and disposal of wastewater sludge.
The conference covers sludge management and anaerobic digestion with a broad holistic system perspective. It includes the recycling of nutrients such as phosphorus and nitrogen by focusing on upstream treatment to reduce harmful substances in wastewater, as well as on the production of biogas as a fuel for vehicles. The certification of treated sludge is another important condition for the possibilities to recycle sludge to farmland areas.
Conference also want to share knowledge, practices and ideas for the future directions of process development. The sludge treatment is one of the key issues to be solved. The aim of the conference is to take a major step forward to where all aspects of sludge management are addressed.
- Production and utilization of biogas
- Nutrient recovery processes
- Processes for hygienization of sludge
- The need for a holistic approach including i.e. environmental effects from sludge handling/management in the total performance efficiency of wastewater treatment
- Use of sludge for energy generation including combustion and supercritical gasification
- Emerging contaminants in sludge – upstream separation and optimization to decrease negative effects by detoxification
- Physical and chemical pre-treatment processes, including chemical conditioning, thickening, dewatering, drying
- Modelling of anaerobic processes
- Methane emission from sludge treatment
Erik Dahlquist at email@example.com and Tel. +46-21-151768
Conference Programme Committee Chairman
Monica Odlare at firstname.lastname@example.org and Tel. +46-21-101611
Conference Programme Committee Secretary
IWA- the global network for water professionals
The International Water Association is a global reference point for water professionals, spanning the continuum between research and practice and covering all facets of the water cycle. Through its network of members and experts in research, practice, regulation, industry, consulting and manufacturing, IWA is in a better position than any other organisation to help water professionals create innovative, pragmatic and sustainable solutions to challenging global needs.
The strength of IWA lies in the professional and geographic diversity of its membership — a global mosaic of national, corporate and individual member communities. Our members are leaders in their field and represent:
- Researchers – where solutions begin
- Utilities – managing water services worldwide
- Consultants – connecting problem owners with solution providers
- Industry – creating sustainable water solutions
- Regulators – safeguarding public health
- Equipment manufacturers – translating ideas into products
The IWA network is structured to promote multi-level collaboration among its diverse membership groups, and to share the benefit of knowledge on water science and management worldwide. The Association helps make the right connections at the right time, thereby sharing cutting-edge research and practice that allows the water sector shape its future.
all content for this post comes from the IWA sites
There is a call for papers for the 7th International Conference on Sustainable Water Resources Management
The Conference will present the more recent technological and scientific developments associated with the management of surface and sub-surface water resources.
21 – 23 May, 2013
Wessex Institute of Technology New Forest, UK
- Water management and planning
- The right to water and sanitation
- Waste water treatment and re-use
- Water markets, policies and contracts
- Climate change
- Urban water management
- Hydraulic engineering
- Water quality
- Pollution contaminants and control
- River basin management
- Flood risk
- Regional and geo-politics of water
- Water resources and economics
- Government and regulations
Papers are invited on the topics outlined and others falling within the scope of the meeting. Abstracts of no more than 300 words should be submitted as soon as possible. Abstracts should clearly state the purpose, results and conclusions of the work to be described in the final paper.
Final acceptance will be based on the full-length paper, which if accepted for publication, must be presented at the conference. The language of the conference will be English.
The paper deadline will be advised after submission of abstracts.
Papers presented at Water Resources Management 2013 will appear in a volume of WIT Transactions on Ecology and the Environment (ISSN: 1746-448X, Digital ISSN: 1743-3541).
All conference papers are archived online at http://library.witpress.com where they are immediately and permanently available to the international scientific community. Papers presented at Wessex Institute conferences are referenced by CrossRef and regularly appear in notable reviews, publications and databases, including referencing and abstract services such as SCOPUS, Compendex, ISI Web of Knowledge, Index to Scientific and Technical Proceedings, ProQuest and Scitech Book News. All conference books are archived in the British Library and American Library of Congress.
all Text/details above are taken directly from the conference site linked above and its sub pages
- Report from Stockholm – World Water Week (sustainability.com)
- Keeping informed about WASH : Water, Sanitation, Hygiene and Health Newsletter (washlink.wordpress.com)
- 40 Former Government Leaders Call on UN Security Council to Make Water Security a Priority (triplepundit.com)
- Water Shortage in Taiwan: Resource Management (thinkingbookworm.typepad.com)