Оценка пригодности очищенных хозяйственно-бытовых сточных вод КОС «Кадамовские» для орошения

Abstract

The purpose of the research is to study the chemical composition of treated domestic wastewater and to assess the potential capability of their use for irrigation purposes. The object of the study is domestic wastewater from the «Kadamovskie» WWTP, Novocherkassk, after mechanical and biological treatment. Research methods included the determination of the wastewater suitability according to the following indicators: the concentration of toxic salts, the ratio of cations, the content of the main biogenic elements (NPK), the irrigation coefficient according to Stebler, the ion exchange coeffi cient by I.N. Antipov-Karataev and G.M. Kader, sodium-adsorption ratio (SAR), risk of magnesium alkalinization (Sabolch and Darab). For studying the chemical composition of treated domestic wastewater, wastewater samples were taken from the «Kadamovskie» WWTP in Novocherkassk and their chemical composition was determined in an accredited environmental analytical laboratory of the Federal State Budget Scientifi c Institution RosNIIPM. Based on laboratory results, wastewater is classifi ed as lowmineralized (1.0…3.0 g/dm3), according to the degree of mineralization. Wastewater (after mechanical and biological treatment) belongs to class III and is characterized as satisfactory. In accordance with the soil-reclamation classifi cation, its suitability for irrigation is limited due to the possibility of chloride salinization processes development. According to calculations based on irrigation coefficients, ion exchange coefficients and sodium adsorption ratio, treated domestic wastewater is suitable for irrigation and it doesn’t cause soil salinity hazard (soil alkalization). Thus, it is recommended to consider treated domestic wastewater from the «Kadamovskie» WWTP in Novocherkassk as an alternative source of irrigation water.