Abstract
The article deals with the issue of reducing the level of man-made danger of the negative impact of urban sewage sludge on the environment by removing heavy metals with the help of humic substances. It is noted that urban sewage sludge contains more than 90% of organic substances that can serve as organic fertilizer for agriculture. However, these sediments are practically not used as fertilizers due to the lack of approved technical and sanitary-hygienic requirements for them. At the same time, it was established that the composition of urban wastewater generated at the city's sewage treatment plants contains heavy metals, which must be removed from wastewater sediments in order to use them as fertilizers in agriculture. A new method of removing heavy metals from urban sewage sludge using humic reagents with simultaneous ultrasound treatment is proposed. Effective modes of simultaneous mixing of humins and their ultrasonic treatment have been selected, as a result of which the efficiency of heavy metals, namely iron, copper and aluminum, is improved.
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