CS265001B1 - Adjustment for water removal of unwanted gaseous constituents by gradual flow of aeration water - Google Patents

Abstract

Regulation for the removal of undesirable gaseous components from water by gradual flow-through aeration with subsequent de-aeration, where the necessary partial gradients are created by dividing the total gradient or by a mechanical element. Devices with gradual flow-through aeration can remove, for example, 80 Å C02 from water with an energy consumption equal to approximately 40 to 55% of the energy consumption for single-stage aeration.

Description

The invention relates to the removal of undesirable components from water. Removal of undesirable gaseous components from water, e.g.

of carbon dioxide or radon from drinking water, is carried out by the most intensive aeration, eg by intensive blowing of air into the water, cutting of water in the air, sprinkling of ceramic elements with event. All these methods generally require a large amount of electrical energy and are not efficient enough at high dissolved gas levels. Partial chemical removal of these gases is also possible, which compromises water quality and is expensive. The effective method of degassing is the gradual continuous flow aeration of the treated water using transient flow effects, resp. their most efficient form - an annular jump in the plant, the essence of which is a series of sequentially connected devices for through-flow aeration of water entering the degassing tanks, where the waste of the previous stage is simultaneously the feed of the next stage. The connection is such that the next stage uses the slope given by the level of the previous stage, or the required slope is created by a mechanical element, eg a pump. In this way, the desired and high desorption effect can be achieved with a suitable choice of hydraulic parameters with considerably less energy consumption than other known devices.

An apparatus for removing gaseous components from water by its gradual flow aeration is shown, for example, in Figs. 1 and 2, wherein Fig. 1 illustrates a solution for slope divisions and Fig. 2 for generating a slope by a pump. The tanks 3, 6, 9 are gradually supplied with the treated water passing through the aeration apparatus 2, 5, 8, which are mounted on the inlets 4, 7, which are simultaneously waste.

265 ΟΟι increments. The first aeration device 2 is at the raw water supply 7. The dewatered water to the desired degree flows through the waste 10 to a consumer or other treatment plant. The individual stages are thus connected so that the next stage utilizes the slope given by the level of the previous stage, so that the total slope H available is equal to the sum of the partial slopes Η '. When alternat. The solution in FIG. 2 is the required partial gradient produced by a mechanical element, e.g. a pump 12.

In order to facilitate the separation of the eliminated gas phase in the degassing tanks, the tanks 3, 6, 9 may be provided with an element facilitating the separation of the gas phase, for example by a poured burst wall 11, which reduces the width of the tank. The described three-stage aeration tank cascade is just an example. The number of stages depends on the desired effect, the relationship of the hydraulic and dimensional parameters, and the nature of the treated water and the desorbed gas.

The rate of desorption (desorption factor) for flow aeration depends on the relative air flow (air to water ratio), while the energy consumption of the flow aeration decreases as the relative air flow decreases. Energy consumption increases with relative air flow according to the law of power.

It can be shown that the overall descent effect by gradual flow aeration with partial slopes exceeds the desorption effect of single aeration at a slope equal to the sum of the partial slopes. In the same way, it can be shown that the energy consumption required for the overall desorption effect resulting from the gradual aeration using partial slopes is considerably less than the energy consumption of a single aeration with a slope equal to the sum of the gradual aeration partial slopes. By way of illustration, by sequential flow aeration, for example, 80% CO 2 can be removed from water at an energy consumption of about 40 ° C.

energy consumption during single aeration. E.g. in the project _ 1 of the specific water treatment with a capacity of 630 ls, it is removed by a three-stage sequential aeration plant with 70% carbon dioxide concentration at an energy consumption of 2.33.10 kWh per m ^{1 of} treated water and% degraded concentration.

265 OOl

The widest application of the invention will be in the treatment of drinking water, in particular by removing excess carbon dioxide, methane, hydrogen sulphide and radon from the water; the entire field of application is also in industrial process technology, especially in the chemical industry. The desorption effect as well as the specific energy consumption depend on the interaction of hydraulic and flow parameters as well as on the chemistry of the water.

Claims (3)

Apparatus for dewatering gaseous components by means of sequential flow aeration, characterized in that it consists of a series of sequentially connected devices (2,5,8) k. flow water aeration by means of flow transients leading to degassing tanks (3,6,9) with raw water inlet (1) to the first aeration tank (3), wastewater (10) treated water from the last aeration cascade tank and with waste and inlets so that the slope of the next stage is given by the level of the previous stage or the required partial slope is created by the pump (12). Apparatus according to claim 1, characterized in that the degassing tanks (3,6,9) are provided with a wall (11) to facilitate separation of the gas phase. Device according to claim 1, characterized in that the raw water inlet (1) is provided with a first aeration device (2).