Strontium-containing radioactive wastewater treatment device

Abstract

The invention relates to a strontium-containing radioactive wastewater treatment device. The strontium-containing radioactive wastewater treatment device comprises a wastewater regulating tank, a coagulation, aeration and co-precipitation tank, a fold-back type biological reaction tank and a clean water tank, wherein the coagulation, aeration and co-precipitation tank comprises a granulating reaction area, an aeration stirring area and a precipitation area; a water inlet pipe of the coagulation, aeration and co-precipitation tank is arranged at the middle-upper part of the granulating reaction area, and a Na2CO3 chemical adding and metering system and a CaCO3 dry powder adding and metering system are arranged at the upper part; a coagulant adding and metering system is arranged at the middle-upper part of the aeration stirring area; a three-phase separator is arranged at an outlet of the precipitation area, an overfalling weir of the coagulation, aeration and co-precipitation tank is arranged at the upper of the outlet, the bottom of the precipitation area is designed into a tapered structure, and a precipitate discharge valve is arranged at the bottom of the tapered structure; the middle-upper part of the fold-back type biological reaction tank is cylindrical, the lower part adopts a conical structure, and the fold-back type biological reaction tank comprises a lower flow area, an upper flow area and a sludge area.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a device for treating radioactive waste water containing strontium. Background technique [0002] Radioactive strontium (Sr) is a pollutant produced by the fission of uranium and plutonium. It usually exists in the generated waste and is one of the main nuclides in radioactive wastewater. Sr is a source of β-ray radiation and has continuous radioactivity with a long half-life. 28.9 years, β-rays are negatively charged electron streams that can cause radiation damage to the skin. Radionuclides can enter the human body through breathing, eating, etc., and internal exposure occurs, destroying the normal physiological functions of the human body and inducing diseases. Strontium and calcium have similar biochemical properties, can participate in the metabolic process of calcium, easily enter the bones of the human body, and are difficult to excrete from the body, cau...

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Problems solved by technology

[0004] Among the treatment methods of strontium-containing radioactive wastewater, the chemical precipitation method has the advantages of simple process, low cost, and wide applicability, but the sludge generated is large and difficult to concentrate; ion exchange and adsorption methods have higher decontamination factors However, the removal of strontium is affected by competing ions, and poor selectivity is one of the reasons that limit the popularization and application of ion exchange and adsorption methods in the treatment of strontium-containing wastewater; membrane technology has good effluent quality, high concentration multiples, and stable operation Reliable, but this method has high requirements on raw water quality, and membrane fouling is an important factor that limits its application; although the biological method is environmentally friendly, the sewage treatment time is long, and the decontamination multiple needs to be improved, so in-depth research is needed in practical applications

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