|| In many developing countries, public and private wastewater disposal systems are often very deficient or even entirely missing. In order to reduce or avoid further deterioration of the environmental conditions in these countries, the wastewater has to be treated. Speaking of organic wastewater from households, tourist facilities and small communities, the decentralised approach may be an appropriate solution for collection, treatment and disposal problems, implementing technologies with a rather low level of mechanisation near the place of generation. The choice of the appropriate technology will depend on several factors such as composition of the wastewater, availability of land, availability of funds and expertise. Different operation and maintenance options will have to be considered with respect to sustainable plant operation, the use of local resources, knowledge, and manpower.