Agrochemical characteristic of sludge from the waste water treatment station near Sofia - city
1998
Marinova-Garvanska, S. (Institut po Pochvoznanie i Agroekologiya "N. Pushkarov", Sofia (Bulgaria))
The aim of our study is to estabilish the agrochemical characteristic of the sludge from the treatment for waste water near Sofia - city by the different steps of treatment. We have taken and analysed the middle samples of sludge eight times in a one month interval. We have taken samples befor and after the methan-tanks, after the vacuun-filter and the drying fields. The sludge from the waste water treatment station near Sofia- city are reach on organic matters, nitrogen and phosphorus. The content of potassium is low and the sludge can not satisfy the needs of the plants for potassium. The content of heavy metals in the studied sludge is under the limited concentration.
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