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Lesson B1 RESOURCE MANAGEMENT SANITATION

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Lesson B1 RESOURCE MANAGEMENT SANITATION EMW ATER E -LEARNING COURSE PROJECT FUNDED BY THE EUROPEAN UNION LESSON A1: C HARACTERISTIC , A NALYTIC AND SAMPLING OF WASTEWATER Lesson B1 RESOURCE MANAGEMENT SANITATION Authors: Holger Gulyas Deepak Raj Gajurel Ralf Otterpohl Institute of Wastewater Management Hamburg University of Technology Hamburg, Germany Revised by Dr. Yavuz Özoguz data-quest Suchi & Berg GmbH Keywords Anaerobic digestion, Bio-gas, Black water, Brown water, Composting/Vermicomposting, Composting/dehydrating toilet, Ecological sanitation, Grey water, Rottebehaelter, Sorting toilet, Vacuum toilet, Yellow water, EMW ATER E -LEARNING COURSE PROJECT FUNDED BY THE EUROPEAN UNION LESSON A1: C HARACTERISTIC , A NALYTIC AND SAMPLING OF WASTEWATER Table of content 1. Material flows in domestic wastewater....................................................................4 1.1 Different sources..................................................................................................4 1.2 Characteristics of different streams...................................................................4 1.3 Yellow water as fertilizer .....................................................................................6 1.4 Brown water as soil conditioner.........................................................................8 2. Conventional sanitation systems and their limitations..........................................9 3. Conventional decentralised sanitation systems – benefits and limitations.......12 4. Resource Management Sanitation .........................................................................14 4.1 Background ........................................................................................................14 4.2 Bellagio statement .............................................................................................17 4.3 Issues of resource management sanitation ....................................................20 4.4 Source separation as a key issue in resource management sanitation........21 4.5 Treatment systems for brown and black water ...............................................21 4.5.1 Composting ...................................................................................................22 4.5.1.1 Composting of faecal materials .......................................................................23 4.5.1.2 Dehydration ........................................................................................................24 4.5.1.3 Vermicomposting ...............................................................................................24 4.5.1.4 Anaerobic digestion/ fermentation ..................................................................25 4.5.2 Composting and dehydration toilet systems ..................................................27 4.5.2.1 Existing dehydration toilet systems ................................................................29 4.5.2.2 Effectiveness of existing dehydration toilet systems ...................................31 4.5.2.3 Effectiveness of existing composting toilet systems ....................................35 4.5.2.4 Vermicomposting toilet system .......................................................................36 4.5.2.5 Vacuum toilet-biogas plant system .................................................................38 4.5.3 Solid-liquid separation systems .....................................................................40 4.5.4 Rottebehaelter systems.................................................................................42 4.5.4.1 Existing Rottebehaelter systems in Germany ...............................................44 4.5.4.2 Effectiveness of Rottebehaelter systems ......................................................47 4.6 Treatment systems for grey water....................................................................48 4.6.1 Biological treatment systems.........................................................................48 4.6.2 Physical and chemical treatment systems.....................................................50 4.7 Treatment systems for yellow water ................................................................50 4.7.1 Storage and reuse.........................................................................................50 4.7.2 Volume reduction and reuse..........................................................................52 4.8 Benefits of source separation in sanitation.....................................................52 5. References ...............................................................................................................56 6. Ecosan internet links...............................................................................................63 Page 2 of 63 EMW ATER E -LEARNING COURSE PROJECT FUNDED BY THE EUROPEAN UNION LESSON A1: C HARACTERISTIC , A NALYTIC AND SAMPLING OF WASTEWATER Overview and summary Human excreta contain valuable plant nutrients as well as organic matter and can be converted into fertiliser and soil conditioner for agriculture. Thus, reuse of human ex- creta reduces the production of chemical fertiliser which is energy intensive, causes environmental problems and draws on very limited fossil resources. Additionally, the surface water is preserved which is otherwise polluted by discharging human excreta into it. Because of high dilution, it is hardly possible to recover good amount of nutrients in conventional sanitation systems. Even modern wastewater treatment plants that are hardly affordable for developing countries emit nutrients into water bodies where they cause eutrophication. Also, pathogens contained in faeces can spread to the aquatic environment causing disease to people. A high amount of nutrient recovery is possible with source control in households. With the application of Resource Management sanitation it is possible to keep human excreta in non-diluted or little diluted form which provides good condition for high levels of nutri- ent recovery as well as for effective sanitisation. The systems that are applied in Re- source Management sanitation for the source control are composting/dehydration toilets, sorting or no-mix toilets as well as vacuum toilets . In composting/dehydra- tion toilet systems either a toilet with urine diversion or no urine diversion is used. In case of no urine diversion toilet, faeces and urine with or without toilet paper depending on the user’s habit drop into the composter located just below the toilet. In urine diver- sion toilet, urine is collected separately and kept in a storage tank until it is ready for use in agriculture. Urine diversion is crucial for dehydration toilets. The non-diluted faecal materials are dehydrated with the help of heat (solar radiation), ventilation and the addi- tion of dry materials. The no mix toilet usually has two bowls, the front one for urine and the rear one for fae- ces. Each bowl has its own outlet from where the respective flow is piped out and treated separately. Urine is stored in an underground tank for sanitisation prior to its reuse in agriculture whereas faeces with toilet paper if used are discharged either into Aquatron system or Rottebehaelter system for solid liquid separation and treatment. The end product of both systems requires post-treatment prior to its reuse. The vacuum toilet uses only 1 litre flush water to flush faeces, urine and toilet paper and the mixer called black water is transported to the biogas plant with the help of a vacuum system. Biogas can be used for heating and lighting whereas sludge can be used in agriculture after sanitisation. Resource Management sanitation systems have been increasingly used around the world. In this lesson, some applications worldwide are presented as well. Also treatment methods for other domestic wastewater that originates from kitchen, shower, wash basin and laundry are discussed. Page 3 of 63 EMW ATER E -LEARNING COURSE PROJECT FUNDED BY THE EUROPEAN UNION LESSON A1: C HARACTERISTIC , A NALYTIC AND SAMPLING OF WASTEWATER 1. Material flows in domestic wastewater 1.1 Different sources Different particular wastewater streams are forming the domestic wastewater (see figure 1). The wastewater originating from toilets is called black water and can be further di- vided into yellow water (urine with or without flush water) and brown water (toilet wastewater without urine). Additionally, grey water is that part of domestic wastewater which originates from kitchen, shower, wash basin and laundry (for more details see Lesson A1). Figure 1: Sources of domestic wastewater (Samwel 2005) 1.2 Characteristics of different streams The typical characteristics of the streams of domestic wastewater, shown in table 1 clearly characterize that yellow and brown water contain most of the nutrients dis- charged to sewers in the conventional sanitation. This means that they are generally wasted instead of being used as fertilizers (except the small portion of nutrients being contained in sludge which is used sometimes as fertilizer after sanitisation). Due to pathogens, brown water poses high health risk, but it represents a very small volume flow in domestic wastewaters (only 50 litres are excreted per person per year). In conventional systems, this small volume is mixed with other streams of domestic wastewater with higher volume flows: yellow water (tenfold volume flow compared to Page 4 of 63 EMW ATER E -LEARNING COURSE PROJECT FUNDED BY THE EUROPEAN UNION LESSON A1: C HARACTERISTIC , A NALYTIC AND SAMPLING OF WASTEWATER faeces) and
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