ADVANCED BIOSOLID BASED ON SEWAGE SLUDGE USED AS ECOLOGICAL PRODUCT IN AGRICULTURE

References: 13th SGEM GeoConference on Nano, Bio And Green – Technologies For A Sustainable Future, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-619-7105-06-3 / ISSN 1314-2704, June 16-22, 2013, 93 - 100 pp

ABSTRACT

Sewage sludge from Romanian littoral wastewater treatment plant is the results of human activity. Many years the incomplete wastewater treatment leads to marine ecosystem pollution, algae bloom and tourist problems. Sewage sludge is the organic by-product of the wastewater treatment process and an important source of essential plant nutrients with applications of organic matter to soils. Sludge characteristics vary depending on each treatment facility’s waste stream and the processes that are used. Sludge that meets the relevant standards for land application, which include reduction or elimination of pathogens and very low limits for heavy metals, are referred to as biosolid. The aim of the paper is to issue a disposal concept as a basis for excess sludge disposal, but under consideration that the effects of sludge on groundwater, soils and agriculture are to be avoided. The agricultural use of sludge is the preferably solution, however it must be stated that earlier attempts for an implementation in agriculture have failed. In respect to the environment protection, especially sludge parameters and their limits, in the last decade national and international environmental initiatives have tried to remedy the environmental degradation of the Danube and the Black Sea. In this paper are presented some data regarding the physical-chemical and microbiological properties of sewage sludge, especially the content of nutrients and heavy metals and the addition effects on soil quality, in the experimental Dobrogea area sites conditions, where biosolid have been applied. The results obtained emphasize new possibilities to improve the organic matter and nutrients of the sewage sludge, as ecological product, in order to increase the soil quality for agriculture.

Keywords: biosolid, sewage sludge, ecological product