CN105523626B - A kind of nickel-plating waste water water cleaning systems and process for purifying water - Google Patents

Abstract

The invention discloses a nickel-plating waste water purification system and a water purification method. The resin-type particle electrode layer of the nickel-plated wastewater purification system is located at the bottom of the water purification system, and an anode made of titanium mesh is placed on the top of the resin, and a cathode made of stainless steel orifice is placed at the bottom of the resin. The anode and the cathode are respectively connected to the external power supply. The positive and negative electrodes are connected, the adsorption biological filter material layer is located above the resin particle electrode layer, and the resin particle electrode layer is connected to the dissolved air water distribution chamber below, and the dissolved air water distribution chamber is equipped with an aeration device and a backwashing device. The water purification method of the present invention includes the following steps: (1) sewage enters the dissolved air water distribution chamber; (2) gas-water mixing (3) resin-type particle electrode treatment; (4) microbial treatment and physical filtration; water. The water purification system of the present invention first catalyzes and oxidizes the refractory organic matter in the nickel-plating wastewater by using the resin particle electrode to improve the biodegradability of the nickel-plating wastewater, and then discharges it after being treated by microorganisms, thereby solving the problem that the nickel-plating wastewater is difficult to handle.

Description

A nickel-plating wastewater purification system and water purification method

technical field

The invention belongs to the technical field of wastewater treatment, and in particular relates to a nickel-plating wastewater purification system and a water purification method that can be used for wastewater treatment.

Background technique

The nickel plating process has been widely used in industrial production because of its versatility and wide application range, and the resulting nickel plating wastewater has also increased significantly. Nickel plating wastewater is a mixed wastewater containing metal ions and some organic matter produced in the process of nickel plating industry. If it is allowed to discharge freely, it will pose serious potential risks to the natural ecological environment and human health. A large amount of heavy metal ions contained in nickel-plating wastewater show strong toxicity to animals and plants, and if they are directly discharged into the environment, it will not only cause irreparable pollution to the ecological environment, but also the toxic substances will gradually affect human beings through the enrichment of the food chain. health hazard.

With the increase in the complexity of the nickel plating process and the use of a large number of refractory organic substances in the nickel plating process, the treatment of nickel plating wastewater is becoming more and more difficult, and traditional sewage treatment methods are difficult to effectively treat it. Coupled with the continuous improvement of related wastewater discharge standards, most of the existing nickel plating wastewater treatment processes have been unable to successfully discharge them up to the standard. Therefore, it is imperative to upgrade the existing nickel plating wastewater treatment process.

The present invention improves the BOD/COD value of wastewater through the resin-type particle electrode treatment technology, so that most of the refractory biodegradable pollutants can be converted into substances that are easily oxidized and decomposed by microorganisms, and then biological treatment is carried out through the adsorption-type biological filter material layer, The purpose of enhancing the treatment effect is achieved, thereby improving the removal efficiency of pollutants in sewage, reducing equipment investment, occupying a small area, and being easy to install on site.

Contents of the invention

The purpose of the present invention is to solve the problem that the existing wastewater treatment process has poor treatment effect on nickel-plating wastewater, and provides a nickel-plating wastewater purification system and a water purification method.

In order to solve the above problems, the present invention includes an adsorption type biological filter material layer, a resin type particle electrode layer and a dissolved air water distribution chamber.

The resin-type particle electrode layer is filled with strong-acid cation exchange resin loaded with ^Fe after pretreatment, and a cathode made of titanium mesh is placed on the top of the resin, and an anode made of stainless steel orifice is placed at the bottom of the resin. The cathode and the cathode are respectively connected to the positive and negative electrodes of the external power supply, and the strong acid type cation exchange resin, the cathode and the anode together form the resin particle electrode layer. The adsorption biological filter material layer is located above the resin particle electrode layer, and the water treated by the resin particle electrode layer enters from the bottom of the adsorption biological filter material through the titanium mesh, and is discharged from the top of the reactor after being treated by microorganisms.

The adsorption-type biological filter material layer and the resin-type particle electrode layer are connected in series in the same reactor from top to bottom. The reactor is a cylindrical shape as a whole, and the resin-type particle electrode layer is filled with a resin-type particle electrode formed by cation exchange resin. The height is 300mm, the adsorption type biological filter material layer is filled with 3-5mm zeolite, the height is 700mm, the diameter of the resin particle electrode layer and the adsorption type biological filter material layer are the same.

The dissolved air water distribution room is equipped with a sewage pipe, a backwash water inlet pipe, an aeration pipe and an aeration pan, the backwash water pump is connected to the backwash water inlet pipe, the air compressor is connected to the aeration pipe, and the aeration pan is installed on the on the trachea.

A method of purifying nickel-plating wastewater as described above, comprising the following steps: (1) The sewage in the high-level water tank is metered by a metering pump and enters the dissolved air water distribution chamber; (2) The compressed air is fed into the aeration pan , control the volume ratio of soda to water from 4:1 to 2:1, and the air and water are fully mixed in the dissolved air water distribution chamber (3) The air and water in the dissolved air water distribution chamber enter the resin particle electrode layer through the stainless steel orifice plate; (4) in the The titanium mesh and stainless steel orifice plate at both ends of the resin-type particle electrode layer are connected to the positive and negative electrodes of the DC power supply through the anode wire and the cathode wire to provide the required electric field for the resin-type particle electrode layer; (5) Sewage and air pass through the titanium mesh Enter the adsorption-type biological filter layer; (6) The water treated by the adsorption-type biological filter layer is discharged through the outlet pipe; (7) Backwash the nickel-plating wastewater purification system after running for a period of time, and first air wash for 3 minutes , and then wash with water and air for 5 minutes at the same time, and then wash with water for 8 minutes.

Beneficial effect of the present invention: under the effect of resin type particle electrode, increase the value of waste water BOD/COD, increase its biodegradability, then remove the pollutant in waste water by biological treatment, thereby improve the removal rate of COD of nickel plating waste water, and Can effectively remove heavy metals in wastewater.

Description of drawings

Fig. 1 is a schematic diagram of a nickel-plating wastewater purification system according to the present invention, which will be further described in conjunction with this figure.

Accompanying drawing 1 is the schematic flow chart of the present invention.

In Fig. 1: 1. DC power supply; 2. Anode line; 3. Cathode line; 4. Resin type particle electrode layer; Rinsing water pump; 10 Water inlet metering pump; 11 Water inlet peristaltic pump; 12 Aeration pipe; 13 Dissolved air distribution chamber; 14 Water outlet pipe; 15 Water (material) sampling port; net; 19 aeration pan; 20 sewage pipe.

Detailed ways

Embodiment one:

Accompanying drawing is a kind of specific embodiment of the present invention, and this embodiment comprises that the sewage in the elevated water tank 16 enters the dissolved air water distribution chamber 13 through the sewage pipe 20 through the sewage metering pump 10, and the dissolved air water distribution chamber 13 is provided with an aeration pan 19, The aeration pipe 12 and the aeration disc 19 are connected with the air compressor 7 through the aeration pipe 12 to form an aeration system to provide the required oxygen for the resin particle electrode and microorganisms, and the backwash water inlet pipe 6 is connected with the backwash water pump 9, The sewage is fully mixed with air in the dissolved air water distribution chamber 13, and then enters the resin-type particle electrode layer 4 through the stainless steel orifice electrode 17. There is a DC power supply 1 outside the resin-type particle electrode layer 4, and the DC power supply 1 passes through the anode wire 2 and the cathode wire. 3 Connect with the titanium mesh 18 and the stainless steel orifice plate electrode 17 in the resin particle electrode layer 4 respectively, generate an electric field in the region of the strong acid cation exchange resin, and make the resin particles form a resin particle electrode, which is treated by the resin particle electrode layer 4 The water enters the adsorption-type biological filter material layer 5 through the titanium mesh 18, and the sewage is discharged through the outlet pipe 14 after being treated by the adsorption-type biological filter material layer 5. ) sample port 15, so as to observe the change of water quality at different positions of the adsorption type biological filter material layer 5 at any time.

The sewage in the high-level water tank 16 enters the dissolved air water distribution chamber 13 through the sewage metering pump 10 through the sewage pipe 20. The dissolved air water distribution chamber is provided with an aeration pan 19 and an aeration pipe 12. The compressors 7 are connected to form an aeration system to provide the required oxygen for the resin-type particle electrodes and microorganisms. The sewage is fully mixed with air in the dissolved air water distribution chamber 13 and then enters the resin-type particle electrode layer 4 through the stainless steel orifice electrode 17. The filler used in the resin-type particle electrode layer is pretreated strong-acid cation exchange resin with a height of 300mm. The water treated by the resin-type particle electrode layer 4 enters the adsorption-type biological filter material layer 5 through the titanium mesh 18, and the adsorption-type biological filter The material layer is filled with zeolite, with a height of 700 mm. After the sewage is treated by the adsorption type biological filter material layer 5, it is discharged through the outlet pipe 14. After the water loss increases to a certain extent, it is necessary to backwash the nickel-plating wastewater purification system. After the inflow of sewage is stopped, the air compressor 7 is used for air washing, and then the backwash water pump 9 is turned on to pressurize the nickel-plating wastewater purification system for combined air and water flushing, and then the air compressor 7 is turned off, and the backwash water pump 9 is used for pressurization The nickel-plating waste water purification system is washed with water, and the backwashed water is discharged through the outlet pipe 14.

The above-mentioned method for purifying nickel-plating wastewater includes the following steps: (1) The hydraulic load of the incoming water is 6m ³ /m ² ·h, metered by the metering pump 10, and then enters the dissolved air distribution chamber 13; 19 is fed with compressed air, the pressure of the air compressor 7 is 0.3Mpa, the volume ratio of air to water is 4:1, and the air and water are fully mixed in the dissolved air water distribution chamber (3) The air and water in the dissolved air water distribution chamber 13 pass through the stainless steel orifice plate The electrode 17 enters the resin-type particle electrode layer 4; (4) the stainless steel orifice electrode 17 and the titanium mesh 18 at both ends of the resin-type particle electrode layer 4 are connected to the positive pole and the negative pole of the DC power supply 1 through the cathode line 3 and the anode line 2, Provide the required electric field for the resin-type particle electrode layer 4; (5) Sewage and air enter the adsorption-type biological filter material layer 5 through the titanium mesh 18; (6) The water treated by the adsorption-type biological filter material layer 5 passes through the outlet pipe 14 discharge; (7) Backwash the nickel-plating wastewater purification system after running for a period of time, first air wash for 3 minutes, then water wash and air wash for 5 minutes at the same time, and then water wash for 8 minutes.

Embodiment two:

The nickel-plating wastewater purification system in this embodiment is the same as the nickel-plating wastewater purification system in Embodiment 1.

The difference between this water purification method and the water purification method in Embodiment 1 is that the air-to-water volume ratio of the aeration is 3:1.

Embodiment three:

The nickel-plating wastewater purification system in this embodiment is the same as the nickel-plating wastewater purification system in Embodiment 1.

The difference between this water purification method and the specific embodiment 1 water purification method is that the air-to-water volume ratio of the aeration is 2:1.

Claims (1)

1. a kind of nickel-plating waste water water cleaning systems, it is characterised in that：Including Rong Qi distributing water room（13）, resin type granule electrode layer（4）、 The absorbent-type biological filter bed of material（5）, resin type granule electrode layer（4）Resin cation type particle of the filling with ion exchange Electrode, the absorbent-type biological filter bed of material（5）It is filled with zeolite, Rong Qi distributing water room（13）, resin type granule electrode layer（4）, absorbent-type The biological filter bed of material（5）Series connection is combined from the bottom to top in a reactor；Wherein resin type granule electrode layer（4）Outside is connected to directly Galvanic electricity source（1）, DC power supply passes through anode line（2）, cathode line（3）Respectively with resin type granule electrode layer（4）Interior titanium net （18）, stainless steel plate electrode（17）It is connected, Rong Qi distributing water room is equipped with aeration plate（19）, aeration tube（12）, backwash water inlet pipe （6）, sewage pipe（20）, aeration tube（12）And air compressor（7）Connection backwashes water inlet pipe（6）And backwash pump（9）Even It connects, resin type granule electrode layer（4）Used resin is obtained after pretreatment by common strongly acidic cation-exchange , preprocess method is as follows, and first common strongly acidic cation-exchange is cleaned with deionized water, then cleans three with acetone It is cleaned to four times, then with deionized water, reaches deimpurity purpose, afterwards by cleaned strongly acidic cation-exchange With resin volume：Liquor capacity is 1：10 ratio is put into FeCl₃When immersion 24 is small in solution, to reach load Fe³⁺Purpose, Finally having loaded Fe³⁺The strongly acidic cation-exchange of ion is from FeCl₃It takes out in solution, is cleaned again with deionized water It is put into afterwards in the environment that temperature is 373K and dries the pretreatment that can be completed to resin.