CS269824B1 - A method of dewatering undesired gaseous components through flow aeration and recirculation - Google Patents

Abstract

Method of removing unwanted gaseous components from water using flow-through aeration and recirculation. Removing unwanted gaseous components from water The degree of treatment is especially important for drinking water. Their removal is achieved by the method of water recirculation by flow-through aeration with degassing during a single or continuous inflow and outflow of treated water. Continuous recirculation by flow-through aeration on the principle of an annular jump can remove, for example, dissolved carbon dioxide to 20% of its input concentration with 45 - 75% energy consumption compared to single aeration.

Description

The invention relates to the removal of gaseous components from the treated water.

Dewatering of undesirable constituents of dissolved gases, such as carbon dioxide, radon, methane, hydrogen sulphide, etc., is carried out by intensive aeration, e.g.

All these methods generally require a considerable amount of electrical energy and do not have sufficient effect at high dissolved gas levels. Continuous flow aeration of recirculated water by means of transient flow, resp. their most effective form - the ring jump. With the appropriate selection of hydraulic parameters, this method can achieve a high deacorption effect β with significantly less energy consumption than other known methods. This method can be used to remove dissolved gas to the desired degree, which is either completely unreachable by other methods or can only be achieved with very high energy consumption. The method of desorption of undesirable gaseous substances from the treated water is according to the invention in that the desorption of the gaseous component is achieved by continuous recirculation of the treated water by a system of flow aeration and subsequent degassing. The water supply to and from the recirculation system may be disposable or a predetermined inflow may flow into the system continuously and the same out of the system. Water aeration leads to desorption of the gaseous component. The rate of desorption (desorption coefficient) in flow aeration depends on the relative air flow (air to water ratio) and is influenced by the water chemistry. It can be shown that energy consumption decreases as the relative air flow decreases. Mixing recirculated water and raw flowing! water increases the instantaneous concentration of desorbed gas in the water and increases the desorption rate, which partially compensates for the effect of mixing the recirculated water with the raw water. The desorption effect depends on the nature of the gas to be removed and also on the chemical composition of the water, in particular on the content of iron compounds as well as on the chemical reactions between them. In the case of drinking water, it is mostly the removal of excess carbon dioxide or radon or methane and hydrogen sulphide from the water. The actual elimination and the energy consumption required to achieve it depend! on the relationship of hydraulic parameters with water chemistry in accordance with technically expedient dispositions.

Similar use is also possible in industrial technology, especially in the chemical industry.

Practical use of continuous recirculation by flow-through aeration based on the ring-jump principle eliminated carbon dioxide at 20% of initial concentration with 45-75% energy consumption versus single aeration.

The same effect is obtained if the water contains other gaseous components such as radon, methane, hydrogen sulphide and the like.

Claims (1)

OBJECT OF THE INVENTION A method of dewatering unwanted gaseous components, carbon dioxide, radon, hydrogen sulfide, methane, characterized in that the treated water is recirculated under continuous flow aeration with continuous degassing, wherein the treated water is fed into and out of the recirculation system. or The inlet and outlet of the treated water is continuous.