RU136429U1 - ELECTROFLOTATOR FOR CLEANING FRESH WATERS - Google Patents

Abstract

An electroflotator for treating fresh water, 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 in the form of coke pitch rods.

Description

The utility model relates to the field of fresh water purification by flotation in order to extract emulsified and dispersed pollutants and can be used to purify fresh water in the reservoir pressure maintenance system of oil fields.

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 to reduce the cost of electricity for wastewater treatment.

The problem is solved in that in an electroflotator for fresh water treatment, comprising 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, and a foam collecting partition, according to a useful cathode model made of coke pitch 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-coke cathodes, figure 3 - the dependence of the bubbling speed on the coke-pitch electrode on voltage, figure 4 - the dependence of the specific energy consumption on voltage on the coke-pitch 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. Indicator lamps 10 are connected between the anode 7 and the bus 9.

On the end walls of the housing 1 there is a pipe And a water inlet and a pipe 12 for water drainage, on the foam output device 6 there is a pipe 13 for foam removal.

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.

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. Coke pitch electrode consists of 30-40% wt. oil pitch, the rest is petroleum coke.

The choice of cathode depends on the bubbling rate on the electrodes of various materials. Theoretically, for metals, 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 s, 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). Graphite and a coke pitch composition were used as such electrodes.

Gas bubbles during bubbling rise up, capture emulsified hydrocarbon droplets and dispersed solid particles, form a flotation foam, which gravity flows over the edges of the foam partition 4, is gravity-discharged by the foam outlet device 6.

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.

Example 1

Conducted experiments on the electrolysis of a solution of sodium chloride with a salinity of 1 to 2.5 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.

It was found that with a salinity of 1-2.5 g / l, the lowest energy consumption was achieved using a coke pitch cathode.

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

It was found that with a salinity of 1-2.5 g / l, the lowest energy consumption was achieved using a coke pitch cathode.

Example 2. Conducted experiments on the bubbling of a solution of sodium chloride with a salinity of 1 to 2.5 g / l of gas bubbles. The bubbling rate and specific energy consumption of energy were determined depending on the voltage at the electrode block when using coke pitch 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 an electroflotator cleans fresh water with a salinity of 1 to 2.5 g / l using coke pitch electrodes, energy consumption is reduced.

Claims (1)

An electroflotator for treating fresh water, 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 in the form of coke pitch rods.

Images