The challenge in developing ...

The challenge in developing countries is to deal with climate. The principle is simple your goal is reusing all the water and the waste material. To do so sanitation will directly depending on the use you plan to do. This is in my sense ecological sanitation Climate is the first challenge dry or wet, hot, with moisturised or dry soil and so on. by the way water availability is controlling how you could use (and waste) it; Secondly depending on the season the organism that are going to digest organic matter could be different. Thirdly the type of habitation, collective or individual. Individual habitation sanitation could be obtained by drying under the sunshine, (wet season) but liquid are lost. perhaps could it be useful to use biochar to catch the water and urine, using a sand or fibre filter to retain solid particle. During the wet season, contamination could happen. but it is also the season for earthworms and fungal development worm composter could be an answer. For collective habitation it seems that water is needed to drain the solid waste from the different floor to the ground. Micro-algae could be grown during the going down for the cleanest water . For the solid compound the longer the way the best fragmentation you have. with the hot temperature you can sterilize in part the compound if a black pipe is exposed to the sun. In that case, it's necessary to store temporary the solids during the night and let them go slowly during the day. This could be useful to alternate thermic and mesophillic phases to enhance biogas production http://www.escet.urjc.es/biodiversos/espa/docencia/micro/biogas6.pdf and this biogas could then be used in a fuel cell or for cooking, cooling The challenge is to change our mind with waste water. dirty BUT useful , contaminated with potential disease BUT not responsible of human hygiene. At this time we are accustomed to live with numerous waste like smog, plastic bags, nuclear pollutants and we are not able to find the best way to recycle our natural waste production? Whatever the issue, the truly challenge is to avoid the risk presented by all the chemical compound that are limiting biological process for example detergent, disinfectant and so on. urban ecological sanitation need "clean" waste water this mean without artificial pollutants. Building wall could be used to find new ways of sanitation processing using new kind of organisms botanical or zoological one. Sanitation is connected with ecological niche that could be enhanced artificially.