Two dominant parameters are characterizing human society at the present stage ofdevelopment: the rapid growth of world population, increasing food production requiring and advancedstate of pollution and environmental damage, requiring increased attention to the quality of investment inkind. Agriculture has gradually become a complex task that is and will remain the safest and mostappropriate means of food production for mankind, being real support of human biological existence,being an important source of raw materials for various industries producing of consumer goods.Imbalance between man and the environment, causes serious and irreversible ecologicalimplications. Environmental problems have various aspects and with the development of society, need tobe addressed with priority. One such problem is the residues from municipal wastewater treatment. Thereare multiple concerns for the elimination of these residues in the environment, without negativeimplications upon environment. The recycling of sludge through land acquired a major interest for manyresearchers, communities, local governments and not least for farmers. Wastewater treatment is bydefinition an activity in support of environmental protection, ensuring retention of pollutants in the formof sludge. To bring wastewater to the level of environmental activity it should be coupled with action forrecovery / containment sludge from the process. For the specific case of sludge from wastewatertreatment, their reintegration into the circuit is achievable in several ways, one of the most practicalincluding application on agricultural land with the following advantages: recovery of large amounts ofplant nutrients (humus, nitrogen, phosphorus, potassium, microelements etc.), decrease of mineralfertilizer quantities required to maintain high levels of agricultural production. Use of sewage sludgedetermines increase soil capacity to mineralize organic matter from wastewater and remediates physical,chemical and biological soil features. Expanding range of fertilizing resources through the use of otherorganic residues outside traditional scientific substances imposed knowledge of the chemical,microbiological and agronomic conditions of their use to avoid negative effects on the environment andconsequently on soil resources Sewage sludge manufacturers must provide user with regular informationon the availability of sludge and sludge characteristics according to the following indicators: pH, totalorganic carbon, dry matter, nitrogen, potassium, phosphorus, cadmium, cromium, copper, mercury,nickel, lead, zinc content.

sewage sludge, environment protection, soil, fertilizers

Presentation: oral