Abstract
The issues of waste disposal are currently having a global technological and economic complexity. The severity of the environmental problem is specified by the accumulation of large volumes of various wastes, including sewage sludge (SS). Modern technologies can provide its disposal with environmental and economic benefits. SS is a rich source of nutrients with a high fertilization potential. This work aims to study the utilization of wastewater sludge in recycling technology for agriculture. The composition of urban sewage sludge and its impact on the properties of gray forest soil were studied. It was shown that its application in a dose of 40-60 t/ha promoted an increase in the content of humus, mobile phosphorus and exchangeable potassium in the soil and a decrease in acidity. The noted increase in the content of the studied heavy metals upon the introduction of various doses of sludge did not exceed the approximate permissible concentration (APC) in the soil. The results showed that the use of SS as a fertilizer restores the balance of organic matter in soils and improves their agroecological properties. This technology, as a safe way of recycling waste into a valuable complex fertilizer, contributes to resource conservation.
Highlights
The problem of waste disposal has nowadays a global technological and economic complexity
The studied influence of sewage sludge (SS) on the properties of gray forest soil showed a shift in the medium reaction to alkali (Fig. 1)
The study considers the feasibility of resource-saving technologies based on sewage sludge
Summary
The problem of waste disposal has nowadays a global technological and economic complexity. The severity of the environmental problem is specified by the accumulation of large volumes of various wastes, including sewage sludge (SS) [2,3,4]. This creates unpredictability and can grow into an ecological catastrophe, as due to anthropogenic impact (constant pollution of ground and surface waters, soils, vegetation) every year it is aggravated and requires a solution. Wastewater sludge is an unavoidable by-product of urban wastewater treatment plants. It is a key problem of many countries due to its increased volume and the consequences of disposal. According to Global Water Intelligence, in 2017 its world volume in dry matter is 83 million tons (an increase of 10.7% as compared to 2012) It is noted that about 2 million tons of sludge are produced in Russia per year [5]
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