RU54934U1 - DEVICE FOR FLOTATION CLEANING OF NATURAL AND WASTE WATERS - Google Patents

Abstract

The invention relates to the field of purification of natural and waste water, namely to flotation machines pressure flotation.

The objective of the proposed technical solution is to reduce construction areas, reduce energy costs and produce high quality water.

A device for flotation treatment of natural and wastewater, comprising a housing, a system for supplying a processed liquid and a flotation agent, a system for removing the treated liquid, and a system for collecting flotation slurry; additionally, a flocculation chamber is built inside the casing, made in the form of a truncated cone with a large base upwards, to which the working fluid supply pipe is additionally connected, and to the bottom of the truncated cone, a processed fluid and flotation agent supply system, into which an ejector with a circulation sediment pipe is additionally introduced, and above the large base of the truncated cone of the flocculation chamber has a mechanism for removing foam.

1 n.p.f., 1 ill.

Description

The proposed technical solution relates to the field of purification of natural and waste water, namely, flotation machines pressure flotation.

A device for wastewater treatment containing a supply pipe, a flotation bath, a clarified water collector, karma for clarified water [Pat. RF №2129528, IPC ⁶ C 02 F 1/24, B 03 D 1/14, 1997].

The disadvantages of this design are:

1. unsuitability for the purification of natural waters, for which a flocculation process is required for 20-30 minutes;

2. the lack of a system for the removal of foam product and non-flotated particles;

3. not using circulating products to reduce the consumption of reagents.

The closest device for flotation treatment of natural and waste water is [Pat. RF No. 2090513, IPC ⁶ C 02 F 1/24, 1993], comprising a housing, a system for supplying a processed liquid and a flotation reagent, a system for removing the treated liquid, and a system for collecting and sealing flotation sludge.

This device is taken as a prototype.

However, this device does not provide for the possibility of reagent softening of natural waters, and if it is used for flotation using reagents, additional facilities such as a mixer, a flocculation chamber and a reagent supply system will be required, which will inevitably lead to an increase in construction areas and energy costs. The accumulation of foam product in the separation chamber having

conical shape, and its removal under hydrostatic pressure, will contribute to the constrained state of individual foam layers with the subsequent destruction of these layers, and, consequently, the deposition of flotated particles. In addition, the upper method of removing purified water will be accompanied by additional flotation of the finest solids due to the residual concentration of dissolved air in the water.

The objective of the proposed technical solution is to reduce construction areas, reduce energy costs and produce high quality water.

The essence of this invention is that a device for flotation treatment of natural and wastewater, comprising a housing, a system for supplying a processed liquid and a flotation agent, a system for draining the treated liquid and a collection system for flotation sludge, an additional flocculation chamber built in the form of a truncated cone with a large base up, to which the working fluid supply pipe is additionally connected, and to the bottom of the truncated cone a common pipe of the mixture of the processed fluid is brought, c rkulyatsionnogo precipitate and reagent. These products are fed into a common pipe using an ejector. Above the large base of the truncated cone of the flocculation chamber, there is a scraper mechanism for removing foam.

In FIG. shows a device for flotation treatment of natural and wastewater, General view.

The device includes a round casing 1 in the plan, an inside flocculation chamber 2, made in the form of a truncated cone with a large base up, pipelines for supplying the processed fluid 3, circulating sludge 4, an ejector 5, a piping for supplying the reagent 6, a common pipe 7, which feeds the mixture to be processed liquid, circulating sediment and reagent in the lower part of the flocculation chamber 2, the working fluid supply pipe 8,

located at a depth of 20-40 cm from the edge of the flocculation chamber. The foam product is removed using mechanical scrapers 9 located above the flocculation chamber into the pocket of the foam product 10. The purified water is discharged by pipe 11 into the pocket of purified water 12. Non-flotated particles are removed by pipelines 13 and 14 using pump 15.

The device operates as follows.

The processed liquid and the circulating sediment through pipelines 3 and 4 through the ejector 5 are fed into the common pipe 7, where the reagent is also fed through the pipe 6. The common pipe 7 is installed tangentially to the flocculation chamber 2, located inside the flotator housing 1. The circulating precipitate is a foam product the amount of 5-10% of the flow rate of the source water. The system for supplying these substances with the help of a tangentially located common nozzle contributes to:

- Intensive mixing of the circulating sediment with the liquid to be cleaned;

- the preliminary formation of centers of flocculation both due to the residual concentration of reagents supplied with the precipitate, and due to the solid phase, which acts as a clouding process;

- smooth spiral rotation.

The conically expanding shape of the flocculation chamber leads to a decrease in the rate of rise of the entire mass, and provides the required residence time of 20-30 minutes. A nozzle for supplying the working fluid 8 is also tangentially brought into the upper part of the flocculation chamber 2 at a depth of 20-40 cm from the edge. As a working fluid, circulating purified water is used in an amount of 40-60% of the original, saturated with dissolved air in a saturator under a pressure of 0.5 -0.6 MPa. The supply of circulating sediment and circulating water reduces (by 50-60%) the amount of supplied reagents. The tangential supply of all products increases the likelihood of air bubbles coming in,

emitted from the working fluid, with the formation of flakes flocculation chamber. The foam product formed on the surface is removed using a scraper mechanism 9 in the pocket of the foam product 10 without exerting additional pressure on the underlying layers of the foam product. The water level in the flocculation chamber 2 corresponds to the phase separation level in the flotator casing 1. The purified water is discharged from the middle part of the flotation tank 1 by means of a pipe 11 and enters the clarified water pocket 12. Unflotted particles are removed using pipelines 13 and 14 by pump 15.

Advantages of the proposed design:

- the suitability of this device for softening natural waters to produce purified water that meets the conditioning requirements for hardness and metals: common iron, strontium, manganese;

- the supply of circulating sediment allows you to intensify the process of flocculation and reduce the dose of the reagent;

- the supply of circulating water as a working fluid also allows you to reduce the dose of the reagent and improve the softening process by reducing the initial hardness;

- the presence of a combined flocculation chamber with a flotation chamber can reduce production areas and reduce energy costs;

- removal of the foam product with the help of mechanical scrapers allows the most complete removal of the swallowed particles;

- the method of drainage of purified water allows to obtain water of higher quality.

The device provides obtaining from source water, with a concentration of hardness salts of 22-28 mEq / l, total iron ≥0.5 mg / l, strontium ≥10 mg / l, purified water with a content of hardness salts of 3-5 mEq / l, completely remove the total iron and extract strontium by 80-95%.

Claims (1)

A device for flotation treatment of natural and wastewater, comprising a housing, a system for supplying a processed liquid and a flotation agent, a system for removing the treated liquid and a system for collecting flotation sludge, characterized in that an additional flocculation chamber is built inside the body, made in the form of a truncated cone with a large base up, which is additionally supplied with a working fluid supply pipeline, and a system of supply of the processed fluid and flotation agent is brought to the bottom of the truncated cone, in which tionary introduced with ejector circulation conduit precipitate and above the large base of the truncated cone flocculation chamber is arranged a mechanism for detachably foam.