CN107827211A - A kind of electrochemical reaction cell for handling algae-containing water - Google Patents

Abstract

The invention relates to the field of water supply treatment, in particular to an electrochemical reaction tank for treating algae-containing water. The reaction tank is provided with a water inlet at the center or at a position where the flow channel is as long as possible, and a water outlet gate is provided on the side wall of the reaction tank; there are vertically insulated electrode separators in the reaction tank, forming a rotary in the reaction tank type or reciprocating flow channel; the cathode plate group or the anode plate group are installed on the electrode separators parallel to each other, and the polarity of the plate groups on the adjacent parallel sections is different, so that an electric field is formed between the adjacent parallel sections; the reaction pool The top is provided with a driving type slag scraper and a driving type slag scraper track, and the driving type slag scraper track is parallel to the side wall with the outlet gate. The above-mentioned reaction pool can be reconstructed from the traditional flocculation pool. For the sudden outbreak of algae pollution, the water plant can respond quickly to realize the treatment of algae-containing water.

Description

An electrochemical reaction tank for treating algae-containing water

technical field

The invention relates to the field of water supply treatment, in particular to an electrochemical reaction tank for treating algae-containing water.

Background technique

Algae outbreaks in slightly polluted water bodies not only affect the safety of the water environment, but also seriously threaten the safety of water treatment. Traditional algae removal structures in waterworks include microfilters, air flotation tanks and floating sinks. However, because algae blooms only occur when environmental conditions are suitable, many water plants do not have separate algae removal structures such as microfilters and air flotation tanks. During the algae outbreak, the water plant mainly uses methods such as pre-oxidation, enhanced coagulation, and increasing the frequency of backwashing of the filter. These methods have limited treatment effects and will also increase the risk of secondary pollution of the water body. The floating-sinking tank uses a combination of a sedimentation tank and an air flotation tank, which solves the problem of increasing the land occupation of the algae removal structure alone. However, for the complex water quality during the algae outbreak, the water treatment effect of the air flotation process is also limited.

Electrochemical treatment of algae-containing water is mainly due to the synergistic effects of electro-oxidation, electro-flocculation, electric floatation and electric field. The flocs are captured to form flocs, and the microbubbles generated during the electric floatation process attach to some flocs, making this part of the flocs float to the water surface. Compared with the conventional algae removal process, electrochemical algae removal has the advantages of no need to add chemicals, avoid secondary pollution, small equipment, easy operation and management, and high removal rate. Although the electrochemical algae removal process has the above advantages, how to combine it with the existing water plant treatment structures for the actual treatment of algae-containing water while ensuring the treatment effect is the difficulty in the current application research of electrochemical algae removal.

Contents of the invention

In order to solve the above problems, the present invention provides an electrochemical reaction tank for treating algae-containing water which can be rebuilt from a flocculation tank.

In order to achieve the above object, the present invention provides an electrochemical reaction tank for treating algae-containing water, which is characterized in that a water inlet is provided at the center of the reaction tank, and a water outlet gate is provided on the side wall of the reaction tank; Insulated electrode separators are provided, and the electrode separators are arranged in a rectangular spiral starting from the center of the reaction tank, forming a rotary flow channel in the reaction tank; a group of parallel straight sections on the electrode separators is installed with a cathode plate group or The anode plate group, and the polarity of the plate group on the adjacent straight section is different, so that an electric field is formed between the adjacent straight sections; the top of the reaction pool is equipped with a driving type slag scraper and a driving type slag scraper track, and the driving type scraper The track of the slag machine is parallel to the side wall provided with the water outlet gate.

The above-mentioned reaction tank can be rebuilt from a traditional rotary flocculation tank, and the above-mentioned cathode plate group and anode plate group are fixed on a set of parallel straight sections in the rotary partition, so that an electric field can be formed between the straight sections to realize Electrochemical treatment of algae, the algae cells are destabilized and inactivated after electro-oxidation, and at the same time are captured by polynuclear hydroxyl complexes and hydroxides produced by electro-flocculation to form flocs, and the microbubbles generated during the electroflotation process are attached to the flocs , the flocs float to the surface of the water. The driving type slag scraper installed on the top of the reaction tank (flocculation tank) scrapes the above-mentioned flocs floating to the water surface out of the reaction tank to remove scum.

Further, one of the cathode plate group or the anode plate group is installed on both sides of the parallel straight section, and the size and installation height of the cathode plate group and the anode plate group of adjacent parallel straight sections are the same.

Further, the cathode plate group or the anode plate group are embedded and installed in the middle of the parallel straight sections, and the size and installation height of the cathode plate group and the anode plate group between adjacent parallel straight sections are the same.

The present invention also provides another electrochemical reaction tank for treating algae-containing water, which is characterized in that the reaction tank is vertically provided with insulating electrode separators, and the electrode separators are arranged in parallel and staggered between opposite sides of the reaction tank. Each electrode separator is in close contact with one of the other two sides of the reaction tank, forming a reciprocating water flow channel in the reaction tank, and the water inlet is arranged at a position where the flow water channel is as long as possible; each electrode separator A cathode plate group or an anode plate group is installed on the top, and the polarity of the plate groups on adjacent electrode separators is different, so that an electric field is formed between adjacent electrode separators; the top of the reaction pool is equipped with a driving type slag scraper and a driving type scraper. The track of the slag machine and the track of the driving type slag scraper are parallel to the side wall with the water outlet gate.

The above-mentioned reaction tank can be rebuilt from a traditional reciprocating flocculation tank, and the above-mentioned cathode plate group and anode plate group are installed on the separator to form an electric field between adjacent separators to realize electrochemical treatment of algae. After electro-oxidation, it is destabilized and inactivated. At the same time, it is captured by polynuclear hydroxyl complexes and hydroxides produced by electrocoagulation to form flocs. Microbubbles generated during the electroflotation process adhere to the flocs, and the flocs float to the water surface. The driving type slag scraper installed on the top of the reaction tank (flocculation tank) scrapes the above-mentioned flocs floating to the water surface out of the reaction tank to remove scum.

Further, the electrode separator is a parallel straight plate.

Further, the electrode separator can also be a V-shaped folded plate, and the end of the electrode separator connected to the side wall is a straight plate.

Further, the water flow channel also includes opposite folded plates and parallel straight plates, the opposite folded plates are arranged between the water inlet and the electrode separator and are opposite to the electrode separator, and the parallel straight plates are arranged between the electrode separator and the water outlet gate Between, the number of said relative folded plates and parallel straight plates is determined by the quality and quantity of treated water.

Further, one of the cathode plate group or the anode plate group is installed on both sides of the electrode separator, and the size and installation height of the cathode plate group and the anode plate group between adjacent separators are the same.

Further, the cathode plate group or the anode plate group are embedded and installed in the middle of the electrode separator, and the size and installation height of the cathode plate group and the anode plate group between adjacent separators are the same. According to the above-mentioned electrochemical reaction tank for treating algae-containing water provided by the present invention, preferably, a slag discharge tank is provided on both sides of the reaction tank perpendicular to the track of the driving type slag scraper, and a discharge tank is provided on the outside of the slag discharge tank. Slag pipe.

Preferably, the cathode plate group is made of aluminum, stainless steel or other materials with good electrical conductivity, and the anode plate group is made of aluminum, boron-doped diamond, DSA or other materials with good electrochemical performance.

The beneficial effects of the present invention are as follows:

1. The reaction tank of the present invention can be rebuilt from the traditional flocculation tank, and the cathode plate group or the anode plate group are installed on the parallel partitions of the traditional rotary, reciprocating and folding plate flocculation tanks, and a driving type scraper is installed on the top of the flocculation tank The machine can be retrofitted by installing a water outlet gate at the water outlet. For the sudden outbreak of algae pollution, the water plant can quickly make improvements to realize the treatment of algae-containing water.

2. The reaction tank of the present invention uses an electrochemical method to remove algae, which can simultaneously realize oxidation, flocculation and air flotation in the traditional sense in one reaction tank, and also avoids the pretreatment of algae removal water, and simplifies the algae removal process. The floor area of the reaction pool is reduced; the use of chemical reagents is also reduced, the risk of secondary pollution of the water body is avoided, and the treated water is safer and healthier.

3. The present invention uses electrochemical methods to remove algae, and can adjust the voltage and current of the power supply at any time according to other conditions such as the algae-containing water and water quality, and increase or decrease the number and size of electrode plates to achieve the best energy consumption and treatment efficiency. Excellent match.

4. When the reaction pool of the present invention is constructed, the electrode plate group is installed on the separator perpendicular to the water outlet direction of the reaction pool in an embedded manner, and the electrode connection mode adopts a unipolar connection mode to make the structure of the reaction pool more compact. Simple.

Description of drawings

Fig. 1 is the top view of embodiment 1;

Fig. 2 is the I-I sectional view of embodiment 1;

Fig. 3 is the top view of embodiment 2;

Fig. 4 is the I-I sectional view of embodiment 2;

Fig. 5 is the top view of embodiment 3;

Fig. 6 is the I-I sectional view of embodiment 3;

Figure 7 is a schematic diagram of the installation of the cathode/anode plate set.

In the figure, 1-water inlet pipe, 11-water inlet, 2-electrode separator, 21-cathode plate group, 22-anode plate group, 3-straight section, 4-water flow channel, 5-water outlet gate, 6-travel Type slag scraper track, 7-driving slag scraper, 8-slag discharge tank, 9-slag discharge pipe, 101-relative folding plate, 102-parallel straight plate.

Detailed ways

The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

Example 1

Referring to Fig. 1 and Fig. 2, an electrochemical reaction tank for treating algae-containing water, the center of the reaction tank is provided with a water inlet 11, and the side wall of the reaction tank is provided with a water outlet gate 5; the reaction tank is vertically provided with insulating electrodes The separator 2 and the electrode separator 2 are arranged in a rectangular spiral starting from the center of the reaction tank, forming a rotary flow channel 4 in the reaction tank; on the electrode separator 2, a group of parallel straight sections 3 are installed with aluminum cathode plates Group 21 or aluminum anode plate group 22, one of the cathode plate group 21 or anode plate group 22 is installed on both sides of the parallel straight section 3, and the polarity of the plate groups on the adjacent straight section 3 is different, An electric field is formed between the 3 adjacent straight sections; the top of the reaction pool is provided with a driving type slag scraper 7 and a driving type slag scraper track 6, and the driving type slag scraper track 6 is parallel to the side wall provided with the outlet gate 5; A slag discharge tank 8 is provided on both sides of the reaction pool perpendicular to the track 6 of the driving type slag scraper, and a slag discharge pipe 9 is provided on the outside of the slag discharge tank 8 .

The above-mentioned reaction tank can be rebuilt from a traditional rotary flocculation tank, and the above-mentioned cathode plate group 21 and anode plate group 22 are fixed on a group of mutually parallel straight sections 3 in the rotary partition to form a The electric field realizes the electrochemical treatment of algae. The algae cells are destabilized and inactivated after electro-oxidation. Attached to the floc, the floc floats to the surface of the water. The driving type scum scraper 7 installed on the top of the reaction tank (flocculation tank) removes the above-mentioned floc scum tank reaction tank floating to the water surface, and discharges the scum through the slag discharge pipe 9 .

During raw water algae outbreak, turn on the power supply connected to the electrodes and the driving type slag scraper 7 power supply, control the water outlet gate 5, and make the water level of the reaction tank rise. At this time, the flocculation tank not only has the normal flocculation function but also has the electrochemical reaction function. The electric field formed between the two electrode separators oxidizes the algae, making them flocculate and float into scum, which is then scraped by the slag scraper. The slag discharge tank 8 is discharged through the slag discharge pipe 9, thereby realizing the removal of algae. During the non-algae removal process, the electrochemical reaction system is closed, the outlet gate 5 is normally open, and the flocculation tank is used according to the conventional treatment process parameters.

Example 2

Referring to Fig. 3 and Fig. 4, an electrochemical reaction tank for treating algae-containing water, insulated electrode separators 2 are vertically arranged in the reaction tank, and the electrode separators 2 are arranged in parallel and staggered between opposite sides of the reaction tank, each An electrode separator 2 is closely connected with one side in the other two sides of the reaction, forming a reciprocating flow channel 4 in the reaction tank, and the water inlet 11 is arranged at a position where the flow channel 4 is as long as possible; each electrode An aluminum cathode plate group 21 or an aluminum anode plate group 22 are installed on the separator 2, and one of the cathode plate group 21 or the anode plate group 22 is installed on both sides of the electrode separator 2, and the cathode between adjacent separators The plate group 21 and the anode plate group 22 have the same size and installation height, and the polarities of the adjacent electrode separators 2 are different, so that an electric field is formed between the adjacent separators; the top of the reaction pool is provided with a driving type slag scraper 7 and a driving type The track 6 of the slag scraper, the track 6 of the driving type slag scraper is parallel to the side wall provided with the water outlet gate 5; the two sides of the reaction pool perpendicular to the track 6 of the driving type slag scraper are provided with slagging grooves 8, and the discharge A slag discharge pipe 9 is provided on the outside of the slag tank 8 .

During raw water algae outbreak, turn on the power supply connected to the electrode plate and the driving type slag scraper 7 power supply, control the water outlet gate 5, and make the water level of the reaction tank rise. At this time, the flocculation tank not only has the normal flocculation function but also has the electrochemical reaction function. The electric field formed between the two electrode separators oxidizes the algae, making them flocculate and float into scum, which is then scraped by the slag scraper. The slag discharge tank 8 is discharged through the slag discharge pipe 9, thereby realizing the removal of algae. During the non-algae removal process, the electrochemical reaction system is closed, the outlet gate 5 is normally open, and the flocculation tank is used according to the conventional treatment process parameters.

The above-mentioned reaction tank can be transformed from a traditional reciprocating flocculation tank. The above-mentioned cathode plate group 21 or anode plate group 22 can be fixed on the parallel partition of the reciprocating flocculation tank, and the water outlet gate 5 is installed at the water outlet. Type slag scraper 7, slag discharge tank 8 and slag discharge pipe 9 can be installed on both sides perpendicular to driving type slag scraper track 6. One of the cathode plate group 21 or the anode plate group 22 is installed on both sides of the electrode separator 2, and the size and installation height of the cathode plate group 21 and the anode plate group 22 between adjacent separators are consistent.

Example 3

Referring to Fig. 5 and Fig. 6, an electrochemical reaction tank for treating algae-containing water, the reaction tank is vertically provided with insulating electrode separators 2, and the electrode separators 2 are arranged in parallel and staggered between opposite sides of the reaction tank, Each electrode separator 2 is in close contact with one of the other two sides of the reaction, forming a reciprocating flow channel 4 in the reaction tank. The electrode separator 2 is a V-shaped folded plate, and the electrode separator 2 and the side wall The connected end is a straight plate, and the water inlet 11 is arranged at a position where the water flow channel 4 is as long as possible; Between the electrode separator 2 and opposite to the electrode separator 2, the parallel straight plate 102 is arranged between the electrode separator 2 and the water outlet gate, and the number of the relative folding plate 101 and the parallel straight plate 102 is determined by the quality and quantity of the treated water; An aluminum cathode plate group 21 or an aluminum anode plate group 22 are installed on the electrode separator 2, and one of the cathode plate group 21 or the anode plate group 22 is installed on both sides of the electrode separator 2, between adjacent separators The cathode plate group 21 and the anode plate group 22 have the same size and installation height, and the polarity of the plate groups on the adjacent electrode separators 2 is different, so that an electric field is formed between the adjacent electrode separators 2; the top of the reaction pool is provided with a driving type The slag scraper 7 and the track 6 of the driving type slag scraper, the track 6 of the driving type slag scraper is parallel to the side wall provided with the water outlet gate 5; A slag tank 8, a slag discharge pipe 9 is arranged on the outside of the slag discharge tank 8.

During the raw water algae outbreak, turn on the power supply connected to the electrode plate group and the driving type slag scraper 7 power supply, control the water outlet gate 5, and make the water level of the reaction tank rise. At this time, the flocculation tank not only has the normal flocculation function but also has the electrochemical reaction function. The electric field formed between the two electrode separators oxidizes the algae, making them flocculate and float into scum, which is then scraped by the slag scraper. The slag discharge tank 8 is discharged through the slag discharge pipe 9, thereby realizing the removal of algae. During the non-algae removal process, the electrochemical reaction system is closed, the outlet gate 5 is normally open, and the flocculation tank is used according to the conventional treatment process parameters.

The above-mentioned reaction tank can be transformed from a traditional folded-plate type flocculation tank, and the above-mentioned cathode plate group 21 and anode plate group 22 can be fixed on the parallel folded plates of the folded-plate type flocculation tank. Type slag scraper 7, slag discharge tank 8 and slag discharge pipe 9 can be installed on both sides perpendicular to driving type slag scraper track 6.

In embodiments 1 to 3, its anode plate group 22 can also be prepared by boron-doped diamond, DSA or other materials with good electrochemical properties, and its cathode plate group 21 can be prepared by aluminum, stainless steel or other materials with good electrical conductivity; implementation The installation method of the electrode plate group in examples 1 to 3 can also be a kind of embedded installation of the cathode/anode plate group 22 on both sides of the electrode separator 2, but the middle of the separator does not penetrate (see a- 2), it can also be embedded in the electrode separator 2 (see b-1 in Figure 7), the two installation methods are suitable for the reaction pool in the construction process, and it is embedded in the electrode separator 2 middle. The former installation method can reduce the consumption of electrode plate groups, which is beneficial to save costs. The electrode connection methods in the reaction tank are all unipolar electrode connection methods. The two sides of the electrode separator 2 have the same polarity, and only one type of electrode reaction occurs on the same electrode separator 2, which makes the design and manufacture of the reaction tank simpler.

Claims (10)

1. An electrochemical reaction tank for processing algae-containing water is characterized in that, the central position of the reaction tank is provided with a water inlet (11), and the side wall of the reaction tank is provided with an outlet gate (5); vertically in the reaction tank Insulated electrode separators (2) are provided, and the electrode separators (2) are arranged in a rectangular spiral starting from the center of the reaction tank, forming a rotary flow channel (4) in the reaction tank; The parallel straight sections (3) are equipped with cathode plate groups (21) or anode plate groups (22), and the polarities of the upper plate groups on adjacent straight sections (3) are different, so that adjacent straight sections (3) An electric field is formed between them; the top of the reaction pool is provided with a driving type slag scraper (7) and a driving type slag scraper track (6), and the driving type slag scraper track (6) is parallel to the side wall with the outlet gate (5) . 2. A reaction cell as claimed in claim 1, characterized in that, one of the cathode plate group (21) or the anode plate group (22) is installed on both sides of the parallel straight section (3), adjacent The cathode plate group (21) and the anode plate group (22) of the parallel flat section (3) have the same size and installation height. 3. A reaction cell as claimed in claim 1, characterized in that, the cathode plate group (21) or the anode plate group (22) are embedded and installed in the middle of the parallel straight section (3), adjacent parallel straight sections The cathode plate group (21) and the anode plate group (22) between the segments (3) are consistent in size and installation height. 4. An electrochemical reaction tank for processing algae-containing water is characterized in that, the electrode separator (2) of insulation is vertically provided with in the described reaction tank, and the electrode separator (2) is parallel between the opposite sides of the reaction tank Arranged in a staggered manner, each electrode separator (2) is in close contact with one of the other two sides of the reaction tank, forming a reciprocating water flow channel (4) in the reaction tank, and the water inlet (11) is arranged so that the water flow The position where the channel (4) is as long as possible; each electrode separator (2) is equipped with a cathode plate group (21) or an anode plate group (22), and the polarity of the plate group on the adjacent electrode separator (2) Different, so that an electric field is formed between adjacent partitions; the top of the reaction pool is provided with a driving type slag scraper (7) and a driving type slag scraper track (6), and the driving type slag scraper track (6) is connected with a water outlet gate The side walls of (5) are parallel. 5. A reaction cell as claimed in claim 4, characterized in that, the electrode separator (2) is a parallel straight plate. 6. A reaction tank as claimed in claim 4, characterized in that, the electrode separator (2) is a V-shaped folded plate, the end of the electrode separator (2) connected to the side wall is a straight plate, and the water flow channel (4) It also includes a relative folding plate (101) and a parallel straight plate (102), and the relative folding plate (101) is arranged between the water inlet (11) and the electrode separator (2) and is opposite to the electrode separator (2) , the parallel straight plates (102) are arranged between the electrode separator (2) and the water outlet gate (5). 7. A reaction cell as described in any one of claims 4-7, characterized in that, one of the cathode plate group (21) or the anode plate group (22) is installed on both sides of the electrode separator (2) , the cathode plate group (21) and the anode plate group (22) between the adjacent separators are consistent in size and installation height. 8. A reaction cell as described in any one of claims 4-7, characterized in that, said cathode plate group (21) or anode plate group (22) are inserted through and embedded in the middle of the electrode separator (2), corresponding to The cathode plate group (21) and the anode plate group (22) between the adjacent partition plates are consistent in size and installation height. 9. A reaction tank as described in any one of claims 1-9, characterized in that, the two side walls of the reaction tank and the track (6) perpendicular to the driving type slag scraper are provided with slagging grooves (8), A slag discharge pipe (9) is provided outside the slag discharge tank (8). 10. A reaction cell as described in any one of claims 1-9, characterized in that, the cathode plate group (21) is made of aluminum, stainless steel or other materials with good electrical conductivity, and the anode plate group (22) It is made of aluminum, boron-doped diamond, DSA or other materials with good electrochemical performance.