Xmas island compost_toilet


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Manual construtivo e explicativo de banheiro seco. Xmas Island Compost Toilet

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Xmas island compost_toilet

  1. 1. E20670a Composting Toilets On Christmas Island M. Maher, Dr T. Lustig, Environmental Management Pty Ltd, 15 Cottenham Avenue Kensington NSW 2033 Australia, terry@environmentalmanagement.com.auABSTRACTKiritimati (Christmas Island) where, like other coral atolls in the Pacific, water is a scarceresource, AusAID has resolved to develop a “Pacific Island Composting Toilet”, andEnvironmental Management has been involved in its development since 1997. Ourexperience on Kiritimati was that the principles of composting toilets are relativelystraightforward, and it was the social acceptance of the toilets that was crucial to theirsuccess. As a result, developing the Pacific Island Compost Toilet was an exercise incommunity consultation and in designing a toilet that was easy to build and use.The paper presents a brief overview of the history of sanitation on Kiritimati and the pre-existing conditions that required us to overcome a widespread negative attitude towardscomposting toilets among the community. It then outlines the community consultationprogram and describes how the design of the composting toilet was altered to incorporatethe needs of the community. The final design of the Pacific Island Composting Toilet ispresented and the current performance of the composting toilets is reviewed. The papercloses by summarising the steps taken in the design of the Pacific Island composting toilet.KEYWORDSComposting toilets, community participation, Kiritimati, monitoring, promotionINTRODUCTIONKiritimati (pronounced ‘Christmas’) Island in the Republic of Kiribati, is the world’s largestcoral atoll with a total area of 640 km2, with its highest point only 13m above sea level. Ithas poor soils and low rainfall and was not inhabited when first sited by Captain Cook in1777. The only sources of potable water on the island are rainwater collection orgroundwater, which is only 1 to 2m below the surface.Kiritimati was virtually uninhabited until seasonal camps of coconut plantation workerswere established in the early part of this century, when villages were set up over some ofthese bodies of water where the lens were closest to the surface. At that time, sanitation inthese villages consisted of walking away from residences, to a beach if possible, for open-air defecation. The I-Kiribati term for defecating translates to ‘going to the water’.It wasn’t until these temporary villages began to become more permanent, essentially afterKiritimati became part of the independent nation of Kiribati in 1979, that problems withsanitation began to appear. Basically, pour-flush toilets with septic tanks were being putinto villages with little consideration for their impact on the environment or on public health.As a result, contamination of village drinking water with faecal matter was guaranteed, notonly through the proximity of wells and pits, but from widespread poor maintenance ofthese systems. The traditional method of open-air defecation was also becomingconstrained as the populations of the villages increased.
  2. 2. There are currently 5 villages on the island, London, Tabwakea, Main Camp, Banana andPoland, with an island-wide population of approximately 3,500. There are plans to increasethe population of the island to around 10,000 people to take pressure off the main islandsof Kiribati. It is therefore important that the type of sanitation used on the island suits notonly the current level of population but can cope with the expected increase.HISTORY OF THE CHRISTMAS WATER SUPPLY AND SANITATION PROJECTIn 1980, a detailed water resources study of Kiritimati by AusAid resulted in a decision toinstigate a Water Supply and Sanitation Project. In the early 1990s, the feasibility ofcomposting toilets was investigated as a viable sanitation alternative for the Project.Kiritimati has low rainfall, shallow groundwater and infertile soils. The main reasons forconsidering composting toilets were that they use no water, are located above ground andproduce material useful for gardening. As these physical conditions are common on coralatolls throughout the Pacific, AusAid reasoned that the composting toilet developed onChristmas should be applicable throughout the Pacific, in effect a “Pacific IslandComposting Toilet”.A pilot trial for composting toilets started in 1994, and finished in 1995, where threedifferent styles of batch composting toilets were built and studied. In total, 15 composttoilets were built in three of the villages. The three styles trialed were the wheelie-bin, thecage-batch and the double-vault.Wheelie-bin composting toiletThis style of composting toilet was developed by Dr Leonie Crennan and has been usedsuccessfully in Australia. Wheelie-bins are modified with interior pipes to assist aeration,and are placed under a pedestal and connected to an excess liquid trench. When full, thewheelie-bin is detached from the trench and placed in the sun, and a new bin placed underthe pedestal. There were eight wheelie-bin composting toilets constructed in the trial.Cage-batch composting toiletThis style of composting toilet had two vaults, with the interior made of a galvanised meshcage to aid air circulation. Both the wheelie-bin and cage-batch had superstructures ofmarine ply. Four cage-batch composting toilets were constructed in the trial.Double-vault composting toiletThe double-vault composting toilet was built out of locally available materials such ascoconut thatching with a tray for aeration. Three double-vault composting toilets were builtin the trial.SANITATION AND COMMUNITY INVOLVEMENTThe principles of sanitation design, including composting toilets, are relativelystraightforward. However, it matters little if a superbly designed sanitation system is built ina community if it is not what the community needs. As was clearly stated by Pickford(1990) in talking about the introduction of new sanitation methods to a community, if it is“introduced from outside without consultation with community members, resistance may beso strong that the new ideas are positively rejected.”
  3. 3. This situation is gradually changing, and it is increasingly recognised that for sanitationprojects “…success depends more on promoting sanitation than on the efficiency ofengineers and builders” (la Fond, 1995).THE COMMUNITY OF KIRITIMATI AND COMPOSTING TOILETSOf all sanitation systems for developing countries, composting toilets require one of thehighest levels of maintenance and commitment from the user. In many areas, the need forthe addition of bulking material and the removal of the compost outweighs the benefit ofthe final product, compost, to be used in agriculture. The importance of a well-designedand effective communications program is therefore essential to the community adoptingthe technology successfully.From the viewpoint of the I-Kiribati community, there were several concerns withcomposting toilets, such as the cultural taboos associated with the handling of faeces. Theimplications of this for getting the owners to change over their composting toilet vaultscould not be under-estimated.In addition, there was the issue of the height of the superstructure, which is much greaterthan most other buildings on the island. This was felt to draw attention to the compostingtoilet, and this, combined with open stairs where people could observe one going up to thetoilet, was seen as too exposed.There were also technical problems resulting from specific health issues of the localpopulation, namely the high incidence of diarrhoeal diseases. As excess liquid trenchesand the pipes to them are usually designed to take liquid, the viscous material going to theexcess liquid trenches readily blocked the pipes. This in turn led to the lower parts of thecompost pile becoming saturated, anaerobic and smelling. This in turn attracted flies aswell as complaints.Some deficiencies in the pilot designs also made them more susceptible to failure in thiscommunity. These might have been rectified in a normal project. However, it was nearlythree years before the main part of the project started in 1997, and the pilot compost toiletswere rarely maintained.COMMUNITY CONSULTATION ON KIRITIMATIThe Overseas Projects Corporation of Victoria (OPCV), AusAid’s Managing Contractor forthe Kiritimati Water and Sanitation Project, engaged Environmental Management to designa composting toilet for Kiritimati based on the three previous styles trialed. When we firstvisited the island in late 1997, most of the composting toilets had failed and as a resultwere not being used, or if they were being used, were smelling and had flies. The resultwas that the community saw composting toilets as inferior to the flush toilet which did notsmell and was easy to use. The community did not understand that the septic tanks werepolluting the groundwater that they were drinking.We decided to go from first principles, and involve the community as much as possible inthe design of the composting toilets.“Participation from the outset has given (the consumers) a sense of ownership andresponsibility for sustaining the flow of project benefits.” (la Fond, p 15)
  4. 4. Ideally, we would have liked to give the community the choice of sanitation alternatives,but on Kiritimati composting toilets were the only sustainable option. Nevertheless, in allour work with the community, we explained why composting toilets were being built inpreference to septic tanks.Further, full-time local Community Liason Officers (CLO), male and female, were used toengage the local community in dialogue.Community meetingsWe started with community meetings at traditional meeting buildings called “maneabas”,where we would address large groups and explain the work we were doing. The first thingto be considered was that these maneabas were associated primarily with religiousgroups, and there could be up to three maneabas in a village, one Catholic, one Protestantand one Seven Day Adventist. It was therefore necessary to visit all these maneabas toensure that as many community members as possible were consulted. We also heldinformal meetings with smaller interest groups, as can be seen in Photo 1.We explained that we knew the composting toilets on the island were not working and wewere there to listen to them and get their ideas on how the toilets could be improved. Ittook time, of course, to develop a relationship of trust with the community and we foundthat our second visit certainly gave us a lot more feedback than the first one. It was fromthis feedback, together with inspections and interviews, that we found the major problemswith composting toilets were seen as being: Smell Flies Height of the building Collecting leaves for bulking materia Photo 1 Informal meeting on KiritimatiWe explained that a properly designed and maintained composting toilet could reduce oreliminate the first three issues, and that the last issue was important for maintaining thecomposting toilet properly.Design of the Christmas compost toiletThe second thing was that we needed to ensure that the new design of composting toiletsworked well. We designed two double-vault styles, with the only difference being how theyaerated the compost. One style used a tray, Photo 2, and the other a net, Photo 3. Thedesign was made robust, to allow for the fact that, as in Australia, the tradesmen building
  5. 5. the facilities know they know better. As much as possible, the materials used were thosereadily available, such as coconut coir for sealing the hatches. Photo 2 Tray composting toilet Photo 3 Net composting toiletFrom a community point of view, we made the vault a sit-down model, which also allowedpeople to squat. This reduced the height of the building. Also, we put the stairs inside thebuilding, making it even less obvious in the landscape. We also used coconut sticks for theexterior, in keeping with traditional I-Kiribati homes. The result is a composting toilet thatworks well in a building that does not stand out in the landscape, as can be seen in Photo4, and therefore reduces the stigma attached to using it.
  6. 6. Photo 4 Exterior view of composting toiletGiven the importance of the design and the need to allow the greatest communityparticipation in the design, the lead in to construction of the composting toilets was around18 months.Monitoring programA monitoring program has been developed which aims to educate the users of thecomposting toilet. A first visit is made to each family when the composting toilet isfinished, with follow-up visits within 2 weeks and then monthly visits. The local CLOsconduct these visits, with the assistance of Government of Kiribati health staff.We are not just giving instructions on how to use the composting toilet, we also make sureto explain why the instructions needed to be followed. For instance, we explain that usingleaves after every visit is important in that it reduces smell and helps keep flies away. As aresult, we found that understanding why they were to use leaves meant they were morelikely to use them.There is also a survey taken during the monthly visits. It collects details on the technicalperformance, use and maintenance of the composting toilet for analysis. As well, compostsamples are being taken at appropriate intervals for testing.Promotion programA promotion program was also developed and is running concurrently with the constructionof composting toilets. Radio information programs are held each week and dramatic playsheld regularly within the community, to increase the knowledge of the wider community.Schools are also visited regularly, and instructed on the environmental and social benefitsof composting toilets to the community, as can be seen in Photo 5. Photo 5 Primary class on KiritimatiThis promotion program works in with the sanitation and hygiene programs run by theGovernment of Kiribati.RESULTS OF THE COMMUNITY CONSULTATION PROGRAMImproved operation of the composting toilet, together with improvements in the design,meant that the smell and flies associated with the earlier models have been greatlyreduced. We found that once the Christmas composting toilet was seen to be working well,with no smell and no flies, people began to view them more positively.
  7. 7. Also, the households who had the composting toilet saw that when they looked after themthey worked well and so have continued to look after them. A promotion program was alsodeveloped and is running concurrently by the CLOs with the construction of compostingtoilets. Radio information programs are held each week and dramatic plays held regularlywithin the community, to increase the knowledge of the wider community. Schools arealso visited regularly, and instructed on the environmental and social benefits ofcomposting toilets to the community.As a result, more and more families are requesting the composting toilet, with the localdoctor and leading Government of Kiribati personnel already having them on their land.As an example of this, Photo 6 shows a composting toilet with a bathroom placed rightnext to it. This bathroom and washing area would not be placed anywhere near smells orflies. Photo 6 Composting toilet with bathroom to left of toiletThe success of the communications program, in particular the use of full-time local CLOs,can be seen in the fact that around 98% of all households with the Christmas compostingtoilet collect leaves and do not regard it as a problem. This is in stark contrast to thebeginning of the Project, when it was one of the most important impediments to theadoption of composting toilets by the community.THE FUTURE OF THE PROJECTThe monitoring and assessment program is still in progress. At the present time, over 100composting toilets have been built and analysis of the results so far show that apart fromsome fine-tuning needed, the toilets are working well and have been accepted by thehouseholders and the wider community.We believe this high level of acceptance is due to: the effort taken to consult the community in the design phase designing the compost toilet for cultural acceptance in height, appearance and use,and the intensive education of the users of the composting toilets with the assistance of thelocal CLOs.
  8. 8. CONCLUSIONComposting toilets are a most suitable form of sanitation for coral atolls because they useno water, are situated above ground, and also provide a useful product for gardens.However, composting toilets are not well known in the Pacific and community resistanceon Kiritimati to the technology was great, and exacerbated by the failure of compostingtoilets in a Pilot Trial left unsupported for nearly three years.Extensive community consultation resulted in community concerns being incorporated intothe design. The resulting design worked well and fitted in with the landscape.Households with a composting toilet were given extensive education by the local CLOs onthe proper use of the toilet, with the wider community being educated through radio, dramaand existing sanitation programs run by their Government.We believe the high level of acceptance of the composting toilet, by individual householdsand the wider community, is evidence that our approach was successful.We would conclude from this that, while it is important to have a robust design based onsound technical principles for a composting toilet in a developing country, the success ofthe project will depend mainly on winning the support of the community.This paper reflects the views of Environmental Management and not necessarily those ofOPCV or AusAid.ACKNOWLEDGEMENTSWe would like to acknowledge the assistance of OPCV and AusAid.REFERENCESPickford, J (1990) ‘Rural sanitation and development’ in Community Health and Sanitationed C. Kerr, Intermediate Technology Publications, London.La Fond A (1995) A Review of Sanitation Program Evaluations in Developing Countries.Water and Environmental Sanitation Section, UNICEF and Environmental Health Projet,USAID, Washington.CONTACTName: Michelle MaherOrganisation: Environmental ManagementTelephone: 61-2-9662 2255Facsimile: 61-2-9662 2322Email: michelle@environmentalmanagement.com.auName: Dr Terry LustigOrganisation: Environmental ManagementTelephone: 61-2-9662 2255Facsimile: 61-2-9662 2322Email: terry@environmentalmanagement.com.au