микроэлементы

The high rate of urbanization in the second half of the last century led to not only to the growth of urban population, but also as a result to increasing of amount of production wastes. During solving problems with mu-nicipal wastewater treatment inevitably the problem of disposal of sewage sludges is arised. Purpose is to pro-vide agroecological substantiation of possibility of application of sewage sludge of Kharkov in the agricultural sector. Methods. Analytical, laboratory modeling and statistics. Results. Agrochemical and ecological assess-ment of sewage sludge of WWTP "Bezlutskiy" at Kharkov are given, compliance with the requirements of nor-mative documents and substantiation of possibility of application of sewage sludge in the agricultural sector are established. Conclusions. It is found that sewage sludge contain sufficiently high amount of organic matter (more than 52 %) and major nutrients (total nitrogen and phosphorus) as well as acceptable concentrations of micronutrients and heavy metals according to the requirements of normative documents. Prospects of sewage sludge application as fertilizer is established.

Azov chernozems have a low background content of mobile forms of zinc, sufficient level of copper and high content of lead compounds. This regional specificity of the microelement composition of the soils is caused by carbonates, natural richness of seaside geochemical landscapes and the influence of the large emission sources of microelements (metallurgical enterprises in Mariupol, Novocherkasskaya power station, etc.). High buffered capacity of the Azov soils reduces the negative effects of pollution.