DD157412A3 - DEVICE FOR VENTILATION OF IRON-BASED WATER - Google Patents

Abstract

Device for ventilation of iron-containing groundwater with low admission pressure in the water supply. The invention relates to the raw water ventilation in the treatment of water, in particular with a low content of excess carbon dioxide free. The aim of the invention is to achieve the raw water ventilation with low material and energy expenditure (pre-pressure) and at the same time to maintain the lime-carbonic acid equilibrium and to restrict the humidity in the ventilation space. The invention provides that the oxygen enrichment takes place without spraying the raw water by automatic air suction in the negative pressure region of a Belueftungsreaktors, the vertical water-air contact tube with central, vertical air supply. The contact tube with the water-air mixture is led to below the water level of the lower basin, wherein the Einstroemturbulenz is reduced by a buerstenfoermige jet brake. This controls the carbon dioxide outgassing and reduces lime precipitation and reduces corrosion damage. The device is particularly suitable for the ventilation of groundwater with medium hardness.

Description

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Device for aeration of water Field of application of the invention

The invention relates to a device for aerating groundwater containing iron in the treatment of water, in particular for the oxygenation of raw water with a low content of free excess carbonic acid and at low admission pressure in the water supply. , y.

Characteristic of the known technical solutions

Several methods and devices for aeration of water are known, the water being sprayed, sprayed, passed over crashes or trickled with the aid of various devices. Air or oxygen is also introduced under pressure into the water. In another known method, water is introduced with a sharp jet into a reaction vessel, whereby a high turbulence 'is generated. According to another known device, the 'pipe grid cascade', the water is divided into drops by means of gratings during the fall, taking up oxygen. ''.

In addition to the oxygen input for iron and manganese precipitation, the cited known methods and devices also fulfill the task of removing excess carbon dioxide from the water.

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In raw waters, which contain only a little free excess carbonic acid, excessive removal of carbonic acid has an adverse effect and disturbs the lime-carbonic acid equilibrium. The poles are lime deposits in subsequent stages of water treatment as well as in tanks and in the water supply network. The water atomization and pressure ventilation also require 'a high pre-pressure or' compressors with considerable energy expenditure. The known devices also require a relatively high construction, operating and maintenance costs · In particular, the atomization of the water-s caused by the strong expulsion of hydrogen sulfide and carbonic acid a high aggressive room humidity, which causes severe damage to equipment and structures.

Object of the invention

The aim of the invention is to ensure with low material and energy expenditure, the ventilation of iron-containing groundwater at weitestgehender'Einschränkung the gas expulsion and thus the aggressive humidity so that unfavorable Polgewirkung be avoided by disturbing the lime-carbonic acid balance. This should simultaneously reduce the maintenance and operating costs ₀

Presentation of the essence of the invention

Der'Erfindung lies the task too. The reason is to use enough energy for the further treatment of water to introduce enough oxygen into the iron-containing groundwater and to limit the excessive outgassing of carbon dioxide. "In addition, the water spray and thus the humidity in the ventilation area should be reduced."

Erf inching s according to the object is achieved such that iron-containing groundwater without it to spray and. without contact with the air in the air-conditioning room in a vertically flowing aeration reactor, which is traversed by a falling jet of water, by means of sucked air in the area of a.

At the same time, sufficient oxygen is taken up by the water and at the same time the carbon dioxide outgassing is induced by the introduction of the aerated water under the water level of a basin. To prevent any subsequent COp outgassing, the turbulence in the water basin or heat sinks is reduced by slowing down the falling beam energy

The device according to the invention is characterized in that a vertical water-air contact tube with constant diameter D is laterally twist-free and centrally or from above connected to a water supply by means of cover or bridge attachment a central vertical air inlet tube is held, which by more than 2 D below the water supply ends. The water-air contact tube, after a drop distance of more than 20 D, enters the lower water collection basin or gutter directly or by means of a lateral continuation of the pipe. "In addition, below the surface of the water, a brush is directed opposite the water jet ^; like beam brake plate attached »The air inlet tube has a diameter smaller than 0.5 D"

Advantageously, according to the invention, the air inlet pipe is expanded at the "high air flow rate above.

After this solution, it is possible. ,, the required. Air oxygen input and an intensive mixing with the raw water in the water-air contact tube at low material costs and geriiigen delivery heights to achieve * The groundwater to be ventilated flows with free

Inlet from above and at a lateral inlet through a centrally arranged feed pipe (also curved) into the water / air contact pipe and falls down thereunder. Below the air inlet point, negative pressure is generated, which causes the air to be sucked in automatically central air inlet tube causes <> The water flow rate is dependent on the pre-pressure or * overflow above the upper edge of the water-air contact • The vacuum is determined by the pipe length between the air inlet point and the water level of the lower basin The intimate mixing of water and air during the fall in the water-air contact tube ensures that a part of the oxygen contained in the air is dissolved in the water By the guidance of the water-air mixture in the contact tube to below desi V / asserspiegel of 7 / only a small proportion of the free carbon dioxide can escape, "In addition, the turbulence of the pelvic surface durc Depending on the requirements, the carbon dioxide outgassing can thus be controlled and the lime-carbonic acid equilibrium can be better maintained. Furthermore, thus the contact of the aerated V / assers with the air, in the Belüfterraurn-reduced to a minimum and thus reduces the humidity «'In addition, within the ventilated contact tube and the temporarily present in raw water hydrogen sulfide is oxidized 5 so that he in the aerator no longer corrosive.

Overall, this also reduces the maintenance effort and limescale deposits.in the downstream Wasserbehandlungsstuf s' and in -Versorgungsnetz avoided «-

Advantageously kaiin also cleaning the water-air Köntaktrohre of Eisenschlarnmablagerungen. by pulling the air inlet tube and inserting a. Foam rubber done, 'which in! floats up and out of the lower basin - · '

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The device is characterized by a very high throughput per cross-section of the aeration break box of 1O000 m / m. House. ".. ·

exemplary embodiment

The invention will be explained in more detail below with reference to an exemplary embodiment. In the accompanying drawings show ._;

Figure 1: section through the water-air contact tube with air inlet tube and side water supply

Figure 2: section through the water-air KontaJctrohr

with Y / asser supply from above and lateral tube continuation of Y / asser-Luft-KontaktrohreSo

According to Figure 1, the v / as s-air-KontaJct tube 1 is laterally and centrally connected by a water supply pipe with a raw water supply 3. The air is supplied through a vertical, by means of a lid attached to the edge of the contact tube air inlet 4 * The mouth of the water-air contact tube 1 is guided without curvature below the Yfesserspiegel 5 of the basin 6. To reduce turbulence is a brush. like Strahlbrernsplatte 7 under the outlet 9. attached. ·.

The air inlet pipe 4 can be provided with high suction at the top to reduce noise. "According to Figure 2, the water-air contact tube 1 is passed through the bottom of a basin or channel 2 above ο The Y / assirzuführ thus takes place from above ₀

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The air inlet pipe 4 is attached by means of narrow webs to "the upper edge of the water-air KontaMoophres 1" .. Except that, the lower end of the water-air contact pipe is 1 by means of a lateral pipe continuation 8 "up to a pool or gutters 6 out, under the water level 5 dips the pipe end. Under the Ausinündung '9 is also a beam brake 7 attached ».

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Claims (1)

Claim - .. · · 1. 'Apparatus for aeration of iron-bearing groundwater at low volumetric pressure' in the water supply, in particular at a low content of free, supercritical carbonic acid in raw water and with limited expulsion of gas during the treatment of water, characterized by '. that a vertical water-air contact tube (1) with a constant   Diameter D laterally swirl-free and 'centrally or von.oben connected to a water supply (3) s is a central vertical air inlet pipe , (4) with a diameter smaller than O ₅ SoD contains j where the air entry point (10) is more than 2 ", D below the water inlet (3) 'and the water / air contact tube (1) ) after a fall distance of more than 20 * D directly or by means of a lateral pipe continuation (8) below the water level (5) of a basin (6) enab and also below the water level (5) near the mouth (9) of the 'water' jjuft 'contact tube, a jet-like jet directed counter to the water jet. brake plate (7) is attached * 2ο device according to claim 1 characterized in that   in that the air inlet pipe (4) is held at the upper edge of the water-air contact pipe (1) by a cleaning cover or by fastening webs. 1 page Z