The soil fertilization in ecological agriculture is done mostly using organic fertilizers. Some of them are prepared as compost from waste, but other haven’t, until now, any recycling possibility. In this context, for the preparation of new types of compost, we used three type of waste: sewage sludge from waste water treatment, marine algae and farmyard manure. We have made four different composting variants, each consisting of different proportions of the three waste: equal parts (33.33%) of each waste, 50% of each of the three wastes separately, the difference being made up in equal amounts (25%) of the other two wastes. Composting process was performed in Könemann silos (cubs with side by 1.20m) and lasted 60 days, from July 19 until September 16, when the composted material has passed the stages of reduction and oxidation. During composting process, in the reductive stage the material has reached a temperature up to 63oC Celsius, enough heat for its sterilization. Initial material, semi composted and final composted material were been chemical analyzed, especially in terms of macro- and microelements, analytical results revealing high and normal content of such chemicals. Therefore the achieved compost could be used in organic farming systems.