Disinfection of wastewater with ultraviolet light on devices of the cyclic principle of action

Abstract

The article presents a diagram of a device for ultraviolet disinfection of wastewater of a cyclic principle of action, which allows you to control the time of liquid processing and, accordingly, the dose of ultraviolet radiation. The device consists of the following structural elements: round-section body; ultraviolet lamps attached to the inner surface of the housing walls; inlet and outlet pipelines with shut-off and control valves; level gauge made in the form of a float. One cycle of operation of the device consists of filling the body, processing (disinfecting) the original liquid, and emptying the body. Control tests of this device were carried out in the process of purifying wastewater from a cattle breeding complex. During the tests of this device, it was revealed that the effluents treated with ultraviolet light with a generally accepted radiation dose of 30 mJ/cm2 do not meet the requirements of sanitary and hygienic standards, since the number of viable helminth eggs at the outlet is 54.2% of their initial value, and the effect of complete deworming can be achieved only at a dose of ultraviolet radiation of at least 45 mJ/cm2.