CN201817307U - Integral nitrogen and phosphorus removal electrolysis unit - Google Patents

Abstract

An integrated denitrification and phosphorus removal electrolysis device in the field of sewage treatment technology, including: electrolytic cell, pH value electrode exchange power supply, aeration tube, conductivity dosing box, conductivity electrode probe, dosing control panel, pH value electrode Probe, mesh metal alloy electrode pair, bracket and air compressor, the utility model integrates the required electrode materials and pH operating conditions in the two reaction processes, and realizes electrolytic denitrification by intermittently changing electrode polarity and adding an aeration device It is efficiently completed in the same electrolytic cell as the electrolytic dephosphorization process. During the reaction process, no acid-base regulator is needed to maintain the high-efficiency reaction; the addition of an aeration tube in the process enhances the removal rate of nitrogen and phosphorus, and the reaction power consumption be effectively reduced.

Description

Integrated nitrogen and phosphorus removal electrolysis device

technical field

The utility model relates to a device in the technical field of sewage treatment, in particular to an integrated electrolysis device for removing nitrogen and phosphorus pollutants in sewage.

Background technique

In recent years, frequent outbreaks of cyanobacterial blooms have occurred in most rivers and lakes in my country, which have had a major impact on people's lives. The excessive nutrient salt in sewage is the main cause of eutrophication in rivers, lakes and seas. The existing urban sewage treatment plants in my country adopt the traditional biological denitrification and phosphorus removal process. The treatment effect on nitrogen and phosphorus nutrients is unstable, and the operating conditions are not easy to control. "Standard" (GB18918-2002), the first-level A or even the first-level B standard. With the improvement of our country's requirements for sewage treatment, it is particularly important to strengthen the removal of nitrogen and phosphorus pollutants in sewage by adding physical and chemical methods. Electrolysis is an efficient sewage treatment method. Because of its simple operation, comprehensive synergistic effects of electrocoagulation, sedimentation and air flotation, fast reaction speed and good treatment effect, it has attracted the attention of scholars from various countries in recent years.

From the retrieval of prior art documents, it is found that due to the difference in pH value, reaction time, electrode material and polarity control, and action mechanism in the two processes of electrolytic denitrification and electrolytic dephosphorization, there is currently no denitrification and dephosphorization. The integrated process and equipment of the whole process. However, when the two processes of electrolytic denitrification and electrolytic dephosphorization are operated separately, it not only increases the floor area of the electrolytic cell and the number of electrode materials used, but also needs to continuously add acid-base regulators during the electrolysis process to maintain the respective reactions. pH range, the above disadvantages have caused the current electrolytic dephosphorization to have few engineering applications, and the electrolytic denitrification process is facing a situation that is difficult to promote in engineering.

Utility model content

The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art and provide an integrated electrolysis device for denitrification and dephosphorization. The utility model integrates the required electrode materials and pH value operating conditions in the two reaction processes, and realizes the efficient completion of the electrolytic denitrification and electrolytic dephosphorization processes in the same electrolytic cell by intermittently exchanging the polarity of the electrodes and adding an aeration device. It has the advantages of small footprint, low cost and high processing efficiency.

The utility model is achieved through the following technical solutions:

The utility model includes: an electrolytic cell, a pH value electrode exchange power supply, an aeration tube, a conductivity dosing box, a conductivity electrode probe, a dosing control panel, a pH value electrode probe, a mesh metal alloy electrode pair, a bracket and an air compressor. Machine, wherein: the bracket is fixed in the electrolytic tank, the mesh metal alloy electrode pair is set on the bracket, the mesh metal electrode pair is connected to the external power supply of the device, the aeration tube is set at the bottom of the electrolytic tank, the air compressor and the aeration tube The pH value electrode exchange power supply is set outside the electrolytic cell, the pH value electrode exchange power supply is connected to the pH value electrode probe, the pH value electrode probe is set inside the electrolytic cell, and the conductivity dosing box is set inside the electrolytic cell. The medicine control panel is arranged on the outer wall of the electrolyzer, and the medicine dosing control panel is respectively connected with the conductivity dosing box and the conductivity electrode probe, and the conductivity electrode probe is arranged inside the electrolyzer.

The electrolytic cell is provided with a water inlet and a water outlet.

The cross-section of the electrolytic cell is in the shape of an inverted trapezoid, and the range of the trapezoidal angle is 30°-45°.

The mesh metal alloy electrode pair is an electrode pair composed of a noble metal alloy electrode and an iron electrode. The distance between the noble metal alloy electrode and the iron electrode is in the range of 1.0cm to 1.5cm. The electrode pair has a longer service life and The energy consumption required for the generation of chlorine gas at the anode is smaller.

The aeration tube is U-shaped, and a number of micropores with a diameter ranging from 1.5mm to 2.5mm are arranged on it, and the solution is aerated through these micropores, and the aeration tube increases the disturbance of the solution and reduces the electrode The occurrence of passivation phenomenon and the transformation of Fe ²⁺ into Fe ³⁺ enhanced the removal efficiency of phosphate, and at the same time promoted the stripping of ammonia nitrogen and accelerated the rate of nitrogen evolution.

Compared with the prior art, the beneficial effect of the utility model is that: the electrode material and the optimal pH value range parameters in the two electrolytic reactions are integrated, and the electrolytic denitrification and electrophosphorization reactions are completed in the same electrolytic cell, and the reaction During the process, the reaction can be kept running efficiently without adding an acid-base regulator; the addition of an aeration tube during the process enhances the removal rate of nitrogen and phosphorus, and the power consumption of the reaction is effectively reduced.

Description of drawings

Fig. 1 is the top view schematic diagram of embodiment device structure;

Among them: 1 is the pH value electrode exchange power supply, 2 is the external power line, 3 is the water inlet, 4 is the aeration tube, 5 is the micropore, and 6 is the water outlet.

Fig. 2 is the cross-sectional schematic diagram of embodiment device structure;

Among them: 7 is the dosing control panel, 8 is the conductivity dosing box, 9 is the conductivity electrode probe, 10 is the pH value electrode probe, 11 is the mesh metal alloy electrode pair, and 12 is the bracket.

Detailed ways

The device of the present utility model is further described below in conjunction with the accompanying drawings: the present embodiment is implemented under the premise of the technical solution of the present utility model, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present utility model is not limited to Examples described below.

Example

As shown in Figures 1 and 2, this embodiment includes: an electrolytic cell, a pH value electrode exchange power supply 1, an aeration tube 4, a conductivity dosing box 8, a conductivity electrode probe 9, a dosing control panel 7, a pH value Electrode probe 10, mesh metal alloy electrode pair 11, bracket 12 and air compressor, wherein: bracket 12 is fixed in the electrolytic cell, mesh metal alloy electrode pair 11 is arranged on the bracket 12, mesh metal alloy electrode pair 11 passes The external power line 2 is connected to the external power supply of the device, the aeration tube 4 is set at the bottom of the electrolytic cell, the air compressor is connected to the aeration tube 4 through two 90° standard elbows, and the pH value electrode exchange power supply 1 is set at the bottom of the electrolytic cell Externally, the pH electrode exchange power supply 1 is connected to the pH electrode probe 10, the pH electrode probe 10 is set inside the electrolytic cell, the conductivity dosing box 8 is set inside the electrolytic cell, and the dosing control panel 7 is set in the electrolytic cell The outer wall of the dosing control panel 7 is connected to the conductivity dosing box 8 and the conductivity electrode probe 9 respectively, and the conductivity electrode probe 9 is arranged inside the electrolytic cell.

Described electrolyzer is PVC (polyvinyl chloride) electrolyzer.

The number of mesh metal alloy electrode pairs 11 is determined by the amount of sewage to be treated.

The electrolytic cell is provided with a water inlet 3 and a water outlet 6 .

The cross-section of the electrolytic cell is an inverted trapezoid with an angle of 40°.

The mesh metal alloy electrode pair 11 is an electrode pair composed of a noble metal alloy electrode and an iron electrode, and the distance between the noble metal alloy electrode and the iron electrode is 1.25cm. Less energy consumption is required.

The noble metal alloy is Ru, or Ir, or Ti.

The pH electrode exchange power supply 1 is a DC stabilized temperature-flow power supply. The power supply monitors the output signal of the pH electrode probe 10 in real time, and switches the positive and negative electrodes of the power supply intermittently to control the pH range of the solution between 6 and 10.

The aeration pipe 4 is U-shaped, and a number of micropores 5 with a diameter of 2mm are arranged on it, through which the solution is aerated, the aeration pipe 4 increases the disturbance of the solution and reduces the electrode bluntness. Occurrence of the oxidation phenomenon, and the conversion of Fe ²⁺ into Fe ³⁺ enhances the removal efficiency of phosphate, and at the same time promotes the stripping of ammonia nitrogen and accelerates the rate of nitrogen evolution.

Aeration pipe 4 is made of polyvinyl chloride pipe in the present embodiment.

The described dosing control panel 7 monitors the output signal in real time according to the conductivity electrode probe 9, and when the conductivity of the solution is greater than 20ms/cm, a conductivity regulator (i.e. dosing) is added, and the dosing control panel 7 makes the influent conductivity When it is insufficient, the ion concentration of the solution can be supplemented, so that the ion reaction speed in the solution is accelerated, the required current energy consumption is reduced, and the concentration of chloride ions in the solution is guaranteed to be at a certain level.

The conductivity regulator is sodium chloride solution.

The working process of this embodiment: During the electrolysis reaction, waste water enters from the water inlet 3 and is discharged from the water outlet 6 . Compressed air enters the micropores 5 of the aeration tube 4, and the solution remains in an aeration state during the reaction process. The initial pH value and conductivity in the wastewater will determine the initial electrolysis process of the solution and whether sodium chloride solution needs to be added. The pH value electrode exchanges the power supply 1 to monitor the output signal of the pH value electrode probe 10 in real time, and intermittently exchanges the positive and negative electrodes of the power supply. Control the pH value range of the solution between 6 and 10, realize the intermittent exchange of electrolytic denitrification and electrolytic dephosphorization process, and keep the pH value of the two reactions always in the optimal range; Sodium chloride solution is added to maintain the conductivity of the solution greater than 20ms/cm, so that the reaction speed of ions in the solution is accelerated, the required current energy consumption is reduced, and the concentration of chloride ions in the solution is guaranteed to be at a certain level.

1) When the electrolytic cell is in the electrolytic denitrification process, the noble metal alloy electrode is the anode, and the iron electrode is the cathode. When the pH value of the solution drops below 6, the pH electrode exchange power supply 1 automatically exchanges the positive and negative electrodes of the electrodes, so that the solution enters the electrolytic dephosphorization process;

2) When the electrolytic cell is in the electrolytic dephosphorization process, the noble metal alloy electrode is the cathode, and the iron electrode is the anode, and when the pH value of the solution rises to 10, the pH electrode exchange power supply 1 will automatically exchange the positive and negative electrodes of the electrodes again, so that the solution enters Electrolytic denitrification process;

The reaction goes on like this. During the reaction, when the conductivity of the solution is less than 20ms/cm, the dosing control panel 7 will automatically add medicine to increase the conductivity of the solution and maintain a certain concentration of chloride ions.

After denitrification and phosphorus removal by the device in this embodiment, the content of pollutants such as nitrogen, phosphorus, and organic carbon in the wastewater are significantly removed, the efficiency of sewage treatment is significantly improved, and the cost is low. The treated wastewater meets the Chinese sewage discharge standards .

Claims (5)

1. An integrated electrolysis device for nitrogen and phosphorus removal, characterized in that it includes: electrolytic cell, pH value electrode exchange power supply, aeration tube, conductivity dosing box, conductivity electrode probe, dosing control panel, pH value Electrode probe, mesh metal alloy electrode pair, bracket and air compressor, wherein: the bracket is fixed in the electrolytic cell, the mesh metal alloy electrode pair is set on the bracket, the mesh metal electrode pair is connected to the external power supply of the device, and the aeration tube Set at the bottom of the electrolytic tank, the air compressor is connected to the aeration pipe, the pH electrode exchange power is set outside the electrolytic tank, the pH electrode exchange power is connected to the pH electrode probe, and the pH electrode probe is set inside the electrolytic tank , the conductivity dosing box is set inside the electrolytic cell, and the dosing control panel is set on the outer wall of the electrolytic cell. internal. 2. The integrated electrolysis device for nitrogen and phosphorus removal according to claim 1, characterized in that, the electrolytic cell is provided with a water inlet and a water outlet. 3. The integrated electrolysis device for denitrification and phosphorus removal according to claim 1 or 2, characterized in that the cross section of the electrolytic cell is an inverted trapezoid, and the range of the trapezoidal angle is 30°-45°. 4. The integrated electrolysis device for nitrogen and phosphorus removal according to claim 1, characterized in that the distance between the electrodes of the mesh metal alloy electrode pair is in the range of 1.0 cm to 1.5 cm. 5 . The integrated electrolysis device for nitrogen and phosphorus removal according to claim 1 , wherein the aeration pipe is U-shaped, and a plurality of micropores with a diameter ranging from 1.5 mm to 2.5 mm are arranged on it.

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