Estimation of the sludge utilization from the waste water treatment plants near Plovdiv relating on the limitance from the heavy metal surplus
1999
Marinova, S. | Chuldjyan, H. (N. Poushkarov Institute for Soil Science and Agroecology, BG-1080 Sofia (Bulgaria))
The aim of this study is to make estimation of the sludge utilization from the waste waters treatment stations near Plovdiv as a fertilizer relating on the limitance of heavy metal surplus. Our experimence shows that there are different criteria for determination of the limited values. Dependent from this criteria the norm for utilization with sludge by previously given duration and periodicality of their use is variable value. This is in connection with the heavy metal content in the sludge and their content in the soil. In the paper as shown the calculations for determination of the utilization norm for fertilization with the sludge from thr depot-place, from the drying fields and from the filter press.
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