Purpose: to determine the suitability of domestic wastewater from the town of Novocherkassk for their use in crop irrigation.
Materials and methods. The materials for the study were samples of wastewater from Kadamovskie wastewater treatment plant (KWWTP) of various degrees of purification. The assessment of suitability of wastewater of various degrees of purification for irrigation was carried out according to their environmental, sanitary-and-hygienic and agrochemical indicators, including the identification of possible degradation potential of wastewater when exposed to soils and fertilizer indicators, based on the agricultural crop needs for nutrients.
Results. Wastewater from the KWWTP was treated separately at mechanical treatment facilities, joint full-scale biologically treated in aeration tanks-mixers, while the treated wastewater was disinfected with gaseous chlorine and additionally treated in biological ponds. To conduct a laboratory experiment, portions of the studied wastewater were selected from the purification system in fourfold replications at representative technological stages. The samples were examined by chemical and microbiological parameters in accordance with the current regulations and methodological recommendations. A conclusion on their ecological, sanitary-hygienic, irrigation and fertilizing characteristics is made.
Conclusions. Wastewater after mechanical treatment has negative sanitary and hygienic indicators, which is the main obstacle to their use as irrigation. Wastewater after disinfection has acceptable indicators for use for irrigation, however, in this case, it is recommended to use it in variants with alternating irrigation with wastewater and natural water or after diluting it with water of favorable for irrigation composition in a ratio of 2:1.
doi: 10.31774/2712-9357-2023-13-1-132-149
domestic wastewater, crop irrigation, runoff water, environmental specifications, sanitary sanitary-and-hygienic indicators, irrigation indicators
Manzhina S. A., Vlasov M. V. Agro-ecological assessment of domestic wastewater for irrigation purposes. Land Reclamation and Hydraulic Engineering. 2023;13(1):132–149. (In Russ.). https://doi.org/10.31774/2712-9357-2023-13-1-132-149.
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