RU134526U1 - ELECTROFLOTATOR FOR CLEANING HIGH-MINERALIZED WASTE WATERS - Google Patents

Abstract

An electroflotator for the treatment of highly mineralized wastewater, comprising a housing divided into a flotation chamber with electrode blocks placed therein consisting of a cathode and a graphite anode, a flotation sludge collection chamber, a flow inlet and outlet chamber, a foam collecting partition, characterized in that the cathodes are made of copper rods, and the voltage on the electrode blocks is 5-10 V.

Description

The utility model relates to the field of wastewater treatment by flotation in order to extract emulsified and dispersed pollutants and can be used for wastewater treatment of oil producing and petrochemical enterprises.

Known electroflotator for wastewater treatment with electrode blocks consisting of a graphite anode and a steel cathode, made in the form of a package of grids (RF Patent No. 2102330). The disadvantage of the invention is the high energy consumption.

The closest technical solution to the problem is an electroflotator with electrodes made in the form of cylindrical graphite anodes and wire cathodes forming a coaxial surface relative to the anode (Patent No. 1474096). The disadvantage of the invention is the high energy consumption.

The objective of the utility model is the development of a device for the treatment of highly saline wastewater, which ensures the achievement of the following technical result - reducing the cost of electricity for wastewater treatment.

The problem is solved in that in an electroflotator for the treatment of highly mineralized wastewater containing a housing divided into a flotation chamber with electrode blocks made of graphite anode and cathode placed in it, a flotation sludge collection chamber, a flow inlet and outlet chamber, a foam collecting partition, according to a utility model cathodes are made of copper rods. The voltage on the electrode blocks is 5-10 V.

Figure 1 shows a sketch of an electroflotator. Figure 2 shows the dependence of the specific energy consumption on mineralization when using copper, brass, graphite and coke pitch cathodes, figure 3 - the dependence of the bubbling speed on the copper electrode on voltage, figure 4 - the dependence of the specific energy consumption on voltage on the copper electrode.

The electroflotator comprises a rectangular housing 1, vertical partitions 2 and 3, a foam collecting partition 4, a purified water outlet device 5, and a foam outlet device 6. An electrode unit is located at the bottom of the electroflotator, consisting of a graphite anode 7 and a cathode 8. The cathodes 8 are connected by a bus 9. Between the anode 7 and the bus 9, indicator lamps 10 are turned on.

On the end walls of the housing 1 there is a pipe 11 for supplying water and a pipe 12 for draining water, on the device 6 for outputting foam there is a pipe 13 for removing foam.

Vertical partitions 2 and 3 divide the electroflotator housing into three chambers: a flow inlet chamber 14, a flotation chamber 15, and a flow outlet chamber 16.

Electroflotator works as follows. The purified water through the pipe 11 enters the flow inlet chamber 14, in which the jet velocity is suppressed. From the chamber 14 through the window in the partition 2, water enters the flotation chamber 15. Gas bubbles during bubbling rise upwards, capture emulsified hydrocarbon droplets and dispersed solid particles, form flotation foam, which gravity flows through the edges of the foam collecting partition 4, is automatically drained by the output device 6 foam.

The purified water enters the flow output chamber 16, in which there is a purified water output device 5, which is a slot cartridge mounted on a screw, with which the water level in the electroflotator is regulated.

As anode 7, graphite was used, which is insoluble in anodic polarization. Any metals or carbon-containing non-metals (graphite, coke pitch composition, coke, carbon graphite, etc.) can be used as a cathode.

The choice of cathode depends on the bubbling rate on the electrodes of various materials. For metals, theoretically, the bubbling rate is maximum for silver (V _max ); for copper, the bubbling rate is 0.956 V _max , for iron 0.647 V _max , for aluminum 0.544 V _max (Nazarov V.D., Zentsov V.N., Nazarov M.V. Water supply in oil production. - Ufa: Oil and gas business, 2010. - 447 p., See table 34). It follows that it is advisable to use copper electrodes or their alloys as a cathode.

However, of considerable interest are non-metallic conductive carbon-containing electrodes with hydrophobicity, on which the conditions for separation of gas bubbles during electrolysis are facilitated (see ibid., P. 104). As such electrodes, graphite and a coke pitch composition are used.

Example 1

Conducted experiments on the electrolysis of a solution of sodium chloride with a salinity of 1 to 200 g / L. The specific energy consumption was determined depending on the salinity using copper, brass, graphite and coke pitch cathodes. The results are shown in table 1 and figure 2.

Table 1 Mineralization, g / l Specific energy consumption, kW · h / m ³ Copper Brass Graphite Koksopek one 80 59 90 44 2,5 fifty fifty 60 fifty 5 26 43 thirty 58 10 13 thirty twenty 70 fifty 9 23 17 81 200 5 19 13 90

It was found that with a mineralization of 2.5-200 g / l, the lowest energy consumption was achieved using a copper cathode.

Example 2. Conducted experiments on the bubbling of a solution of sodium chloride with a salinity of 1 to 200 g / l of gas bubbles. The bubbling rate and specific energy consumption were determined depending on the voltage at the electrode block when using copper cathodes. The results are shown in figure 3 and figure 4.

It was found that the optimal voltage values at the electrode blocks are 5-10 V. At voltages less than 5 V, the bubbling rate decreases, and at voltages greater than 10 V, energy costs increase.

Examples of experiments prove the achievement of the task, i.e. when the wastewater is purified by electroflotator with a salinity of 2.5 to 200 g / l using copper electrodes, energy consumption is reduced.

Claims (1)

An electroflotator for the treatment of highly mineralized wastewater, comprising a housing divided into a flotation chamber with electrode blocks placed therein consisting of a cathode and a graphite anode, a flotation sludge collection chamber, a flow inlet and outlet chamber, a foam collecting partition, characterized in that the cathodes are made of copper rods, and the voltage on the electrode blocks is 5-10 V.

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