Abstract
The results of research on the optimal conditions for obtaining a prolonged-action complex fertilizer from wastewater from woodworking enterprises are presented. The main active substance of the fertilizer is a nitrogen-containing insoluble polymer, obtained by polycondensation of urea-formaldehyde resin with urea. To produce the finished product, the resulting polymer is mixed with ash. It was found that the maximum yield of a prolonged-action complex fertilizer based on the urea-formaldehyde polymer is achieved under the following conditions: pH = 2,0, molar ratio of formaldehyde: urea 1,0: 1,5, reaction time 3,5–4,0 h. It is shown that the fertilizer obtained can be used in agriculture to improve the nitrogen, phosphorus and potassium nutrition of plants, as well as to reduce the intake of cesium 137 radionuclides into agricultural products.
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