CN215855532U - Ammonia nitrogen removing device for alkaline etching wastewater - Google Patents
Ammonia nitrogen removing device for alkaline etching wastewater Download PDFInfo
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- CN215855532U CN215855532U CN202122409307.5U CN202122409307U CN215855532U CN 215855532 U CN215855532 U CN 215855532U CN 202122409307 U CN202122409307 U CN 202122409307U CN 215855532 U CN215855532 U CN 215855532U
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Abstract
The utility model provides an ammonia nitrogen removal device for alkaline etching wastewater, which comprises an adjusting tank, a liquid storage tank, a filtering tank, a collecting tank, an alkaline storage tank with alkaline liquor, a deamination device and an acid storage tank with acid liquor, wherein the adjusting tank can adjust the pH value in the tank and is added with a flocculating agent, a stirrer is arranged in the adjusting tank, the liquid storage tank, the filtering tank and the collecting tank are sequentially connected through pipelines, the water outlet of the collecting tank is mutually connected with the alkaline liquor outlet of the alkaline storage tank and is connected with the deamination device through a pipeline, and the deamination device is connected with a clear water collecting tank through a pipeline and is simultaneously connected with the acid storage tank through a pipeline to form a circulation path. The utility model adopts the mutual connection and matching of the components, can recover valuable metal copper in the wastewater, effectively ensure the removal of ammonia nitrogen in the wastewater, and the deamination device is connected with the acid storage tank to recycle acid liquor, thereby reducing the wastewater treatment cost and reducing the environmental pollution during the treatment.
Description
Technical Field
The utility model belongs to the technical field of PCB processing wastewater treatment, and particularly relates to a device for removing ammonia nitrogen in alkaline etching wastewater.
Background
The industrial waste water of the printed circuit board is produced while the industry of the printed circuit board is rapidly developed, the types of the industrial waste water mainly comprise nickel-containing waste water, organic waste water, printing ink waste water, complexing waste water and the like, wherein the waste water containing ammonia nitrogen is usually produced in an alkaline etching process, the alkalinity of the waste water is strong, the content of ammonia nitrogen and complexing copper ions is high, if the waste water is not treated well, serious water and soil pollution is caused, and finally the waste water enters a human body from a food chain, the life safety of human beings is seriously threatened, and the brought environmental problems are inestimable, so enterprises have to put a large amount of cost into treating the waste water and adopt effective measures to effectively treat the waste water in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides the device for removing the ammonia nitrogen in the alkaline etching wastewater after the PCB processing, which can effectively remove the ammonia nitrogen in the wastewater and recover valuable metal copper.
The utility model provides an ammonia nitrogen removal device for alkaline etching wastewater, which comprises an adjusting tank, a liquid storage tank, a filtering tank, a collecting tank, an alkaline storage tank with alkaline liquor, a deamination device and an acid storage tank with acid liquor, wherein the adjusting tank can adjust the pH value in the tank and is added with a flocculating agent, a stirrer is arranged in the adjusting tank, the liquid storage tank, the filtering tank and the collecting tank are sequentially connected through pipelines, the water outlet of the collecting tank is mutually connected with the alkaline liquor outlet of the alkaline storage tank and is connected with the deamination device through a pipeline, and the deamination device is connected with a clear water collecting tank through a pipeline and is simultaneously connected with the acid storage tank through a pipeline to form a circulation path.
Optionally, the filtering tank comprises an activated carbon tank and a resin tank which are connected in sequence, and a water inlet of the activated carbon tank is connected with a water outlet of the liquid storage tank; the resin tank is a first resin tank and a second resin tank which are connected in series, a water inlet of the first resin tank is connected with a water outlet of the activated carbon tank, and a water outlet of the second resin tank is connected with a liquid inlet of the collecting tank.
Optionally, the deamination device includes three deamination tanks that concatenate each other, each deamination tank is including the jar body that has the inner chamber, each deamination tank inner chamber be equipped with the membrane module that alkali storage tank is connected, the membrane module has the deamination membrane that can make ammonia leach, the jar body with acid storage tank is connected, makes membrane module outer wall with between the internal wall of jar be full of by the sulphuric acid solution that acid storage tank pump was gone into.
Optionally, a pipeline mixer capable of uniformly mixing the wastewater and the alkali liquor is arranged on a pipeline entering the deamination device.
Optionally, a first safety filter is arranged on a pipeline entering the deamination device, and a pressure gauge is arranged on the first safety filter.
Optionally, a second safety filter is arranged on a pipeline connecting the tank body and the acid storage tank, and a pressure gauge is arranged on the second safety filter.
Optionally, a conductivity meter and a pH meter are arranged on the acid storage tank and a pipeline entering the deamination device.
Optionally, a flow meter is further arranged on a pipeline entering the deamination device.
The utility model has the following technical effects:
(1) the ammonia nitrogen removal performance of the industrial wastewater ammonia nitrogen removal device can be effectively guaranteed, the wastewater treatment performance can be more perfect through filtering and mixing and later-stage PH regulation, the later-stage discharge is more stable, and the problem that the ammonia nitrogen removal performance of the existing industrial wastewater ammonia nitrogen removal device is not perfect is solved; the copper ion content in the treated alkaline etching wastewater is less than 0.1mg/L, the ammonia nitrogen content is less than 3mg/L, and the emission standard of enterprises can be reached.
(2) The utility model can enrich copper ions in the treatment process, creates conditions for extracting the subsequent valuable metal copper, simultaneously releases ammonia gas to be dissolved in sulfuric acid, has no harmful gas to overflow, and can process the generated ammonium sulfate into ammonia fertilizer.
(3) The deamination device is circularly connected with the acid storage tank to recycle acid liquor, so that the treatment cost is reduced, the condition for maximizing resources is created, and the pollution to the environment during treatment can be reduced.
(4) The utility model has the advantages of small occupied area, simple operation, high automation degree and low energy consumption, does not need heating treatment in the whole reaction process, can effectively remove ammonia nitrogen only by acid-base treatment and membrane separation, and is favorable for popularization and application of the device.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
It will be understood that when an element is referred to as being "connected," "disposed" or "disposed" to another element, it can be directly on the other element or intervening elements may also be present.
It should also be noted that the terms "top," "bottom," "upper end," "lower end," and the like in the embodiments of the present invention are used in a relative sense or with reference to the normal use of the product, or are used in the illustrated position of the drawings, and are used merely for convenience in describing the utility model and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered limiting.
Referring to fig. 1, the embodiment of the utility model provides an ammonia nitrogen removal device for alkaline etching wastewater, which comprises a regulating tank 1, a liquid storage tank 3, a filter tank 4, a collecting tank 5, an alkaline storage tank 6, a deamination device 9 and an acid storage tank 16 with acid liquor. The alkaline etching wastewater enters an adjusting tank 1 after being collected, and a sulfuric acid solution is added into the adjusting tank 1 so that the pH value of the wastewater in the tank is in a range of 4.5-6.5, so that an ammonia nitrogen and copper complex system formed by the wastewater generated in the process of etching copper by ammonia water in an alkaline state can be broken down in a weak acid state to form copper hydroxide precipitate. Meanwhile, a stirrer 101 is arranged in the adjusting tank 1, a certain amount of flocculating agents PAM and PAC are added, the stirring is carried out by the stirrer 101, copper hydroxide precipitation and membrane slag flocculation in the wastewater are enabled to form bulk particles which are easy to dewater, the bulk particles are settled at the bottom of the adjusting tank 1 and are discharged through filter pressing by a filter press 2, and water pressed out by the filter press 2 enters a liquid storage tank 3. Therefore, not only the membrane slag in the wastewater can be separated from the water, but also most of the copper in the wastewater can be removed. The filtering tank 4 can further remove the residual copper in the wastewater, thereby ensuring the complete recovery of valuable metal copper and the standard of subsequent effluent. The liquid storage tank 3 is used for storing the wastewater after flocculation and deslagging of the regulating tank 1; the collecting tank 5 can be used for standing and filtering wastewater after copper recovery; the adjusting tank 1, the liquid storage tank 3, the filtering tank 4 and the collecting tank 5 are sequentially connected through pipelines, and a pump 19 is arranged on each connecting pipeline so that wastewater enters the next treatment element from the previous treatment element. Alkali liquor (NaOH) is added into the alkali storage tank 6, the water outlet of the collecting tank 5 is mutually connected with the alkali liquor outlet of the alkali storage tank 6, after copper removal treatment of wastewater, the wastewater in the collecting tank 5 is fully mixed with the NaOH in the alkali storage tank 6, the pH value of the wastewater is ensured to be between 11 and 12, and the ammonia in the wastewater can overflow. Waste water and NaOH mix the back, through tube coupling deamination device 9, deamination device 9 passes through the pipeline and is connected with acid storage tank 16, forms circulation route, is connected with clear water collecting vat 14 simultaneously, gets into the waste water in the deamination device 9 and the circulation of the sulphuric acid solution in the acid storage tank 16 and flows, and the cooperation is got rid of ammonia nitrogen in the waste water, and the waste water after accomplishing ammonia nitrogen and handling passes through the clear water collecting vat and collects, accomplishes whole and alkaline etching waste water treatment process. The utility model adopts the mutual connection and matching of the components, can recover valuable metal copper in the wastewater, effectively ensure the removal of ammonia nitrogen in the wastewater, and the deamination device is circularly connected with the acid storage tank 16 to recycle acid liquor, thereby reducing the wastewater treatment cost, reducing the pollution to the environment during treatment, meeting the requirements of the current wastewater treatment on enterprises and achieving better social benefit and economic benefit.
Referring to fig. 1, in the preferred embodiment of the present invention, the canister 4 comprises an activated carbon canister 41 and a resin canister 42 connected in series by a pipeline, a water inlet of the activated carbon canister 41 is connected to a water outlet of the liquid storage tank 3, and the waste water in the liquid storage tank 3 is injected into the activated carbon canister 41 by the pump 17. The resin tank 42 adopts a first resin tank and a second resin tank which are connected in series, resin layers are arranged in the first resin tank and the second resin tank, and the characteristic of ion exchange resin adsorption and exchange of metal cations is utilized to adsorb the rest copper in the wastewater. The water inlet of the first resin tank is connected with the water outlet of the activated carbon tank 41, and the water outlet of the second resin tank is connected with the liquid inlet of the waste liquid collecting tank 5. Go into activated carbon canister 41 with the waste water pump of collecting in the liquid reserve tank 3 after, at first through the suspended solid in the activated carbon canister 41 among the activated carbon filler adsorption waste water, resin layer in it is blockked up by the suspended solid in the waste water when avoiding follow-up resin jar 42 to handle, waste water in the liquid reserve tank 3 passes through pump 17 and pours into and can obtain the buffering in activated carbon canister 41 after filtering jar 4 simultaneously, make waste water carry out ion exchange with the resin layer in steady state and the resin jar 42 when getting into two resin jar 42, in order to guarantee resin layer furthest's absorption copper. Thus, the embodiment of the utility model adopts the combination arrangement of the activated carbon tank 41 and the two-stage resin tank 42, which can completely remove copper in the wastewater, and recover valuable metal copper in the wastewater.
Referring to fig. 1, in a preferred embodiment of the present invention, the deamination apparatus 9 includes three deamination tanks connected in series, each deamination tank includes a tank 91, the tank 91 has an inner cavity 92, the lower end of the outer side of the tank 91 is provided with an acid inlet 96, the upper end of the tank 91 is provided with an acid outlet 94, the acid inlets 96 and the acid outlets 94 are both connected to the acid storage tank 16, and the sulfuric acid solution in the acid storage tank 16 enters the inner cavities of the tanks 91 in parallel and forms a communication loop, so that the sulfuric acid solution in the acid storage tank 16 circularly flows in the inner cavity 92 of the tank 91. In the inner chamber 92 of every grade deamination jar, still be equipped with membrane module 93, set up and receive the mixed liquid that 5 waste water in collection groove and the NaOH of alkali storage tank 6 are mixed in mixed liquid import 97 at jar body 91 top, mix the liquid and get into membrane module 93 in, jar body 91 bottom is established and is mixed liquid export 95, mixes the liquid and accomplish after handling at membrane module 93 and get into the next grade deamination jar membrane module that same structure set up from this mixed liquid export 95, and last one-level deamination jar membrane module delivery port connects clear water collecting vat 14. In each membrane module 93, a deamination membrane is arranged for overflowing ammonia gas in the waste water, and when the alkaline etching waste water containing ammonia nitrogen flows in the membrane module 93, gaseous NH in the waste water3Can enter the inner cavity 92 through the micropores on the surface of the hollow fibers on the film layer, and the sulfuric acid solution pumped in from the acid storage tank 16 filled between the outer wall of the film component 93 and the inner wall of the tank body 91 is absorbed to be changed into the NH in an ionic state4Ammonium salt (NH) formation after a certain concentration of the sulfuric acid solution has been continuously circulated4HSO4Or (NH)4)2SO4) Thereby achieving the purpose of deamination. Therefore, sulfuric acid solution in the deamination tanks is connected in series and is subjected to multi-stage treatment and the acid storage tank 16 enters the inner cavities of the tanks 91 through pipelines in parallel to form a communicated loop to flow circularly, so that the removal rate of ammonia nitrogen in the wastewater is greatly improved, the utilization rate of the acid solution can be improved due to the circular flow of the sulfuric acid solution in the acid storage tank 16, the treatment cost of alkaline etching wastewater can be reduced, and the pollution to the environment can be reduced due to the closed-loop operation.
Referring to fig. 1 again, in the preferred embodiment of the present invention, a pipeline mixer 10 is disposed on the pipeline entering the deamination device 9, and the pipeline mixer 10 can enable the mixed solution of the wastewater in the collecting tank 5 and the NaOH in the alkali storage tank 6 to be uniformly mixed on the pipeline through the pipeline mixer 10, which is beneficial to the precipitation of ammonia gas in the wastewater, so as to ensure the ammonia nitrogen removal effect after the wastewater enters the deamination device 9.
Referring to fig. 1, in the preferred embodiment of the present invention, a first safety filter 7 is disposed on a pipeline entering a deamination device 9, and a pressure gauge 8 is disposed on the first safety filter 7 to instantly detect the pressure in the first safety filter 7. Before the first safety filter 7 can be arranged on the pipeline mixer 10, the mixed liquid entering the deamination device 9 can be filtered, and the deamination membranes in the deamination tank membrane components 93 are prevented from being blocked by impurities in the wastewater.
Similarly, a second safety filter 15 is provided in a pipe connecting the tank 91 and the acid storage tank 16, and a pressure gauge 8 is provided in the second safety filter 15, so that the pressure in the second safety filter 15 can be detected in real time. The second security filter 15 can filter the sulfuric acid solution entering the tank 91 from the acid storage tank 16, so as to prevent impurities in the recycled sulfuric acid solution from blocking deamination membranes in the deamination tank membrane assemblies 93.
Referring further to fig. 1, in the preferred embodiment of the present invention, the pipeline entering the deamination device 9 and the acid storage tank 16 are both provided with a conductivity meter (CI)11 and a pH meter 12, which can monitor the conductivity of the sulfuric acid solution entering the inner cavity 92 of each deamination tank and the conductivity of the sulfuric acid solution in the liquid storage tank 16 to ensure that the deamination membrane works normally and prevent reverse osmosis.
The pipeline entering the deamination device 9 is also provided with two flow meters 13, and the two flow meters 13 are respectively arranged on the pipeline entering from the mixed liquid inlet 97 at the top of the tank body 91 and the pipeline entering the tank body 91 from the acid storage tank 16 so as to control the flow of the mixed liquid and the acid liquid entering the deamination device 9, so that the mixed liquid and the acid liquid reach a balance value and the deamination device 9 can effectively remove ammonia nitrogen in the wastewater.
The working process of the embodiment of the utility model shown in fig. 1 is as follows:
firstly, alkaline etching solution waste water is injected into a regulating tank 1, and H is added2SO4And (3) enabling the pH value of the wastewater in the regulating tank 1 to be 4.5-6.5 to form copper hydroxide precipitate, then adding flocculating agents PAC and PAM into the tank, starting the stirrer 101 to stir for 30-60min, enabling the copper hydroxide and the membrane slag in the wastewater to form flocculation groups to settle at the bottom of the regulating tank 1, then closing the stirrer 101, standing, and pumping the supernatant after the regulating tank 1 is stood into the liquid storage tank 3 through the pump 17. Meanwhile, the copper hydroxide sediment and the membrane slag at the bottom of the regulating tank 1 enter a filter press 2 for internal pressure filtration, and the effluent after filter pressing is pumped into a liquid storage tank 3 through a pipeline into which supernatant flows.
The wastewater collected in the liquid storage tank 3 is pumped into an activated carbon filter tank 41, and then the wastewater enters a two-stage resin tank 42, so that the residual copper in the wastewater is adsorbed by the resin tank 42, and the copper in the wastewater is completely removed.
Waste water after filtering and removing copper gets into in collecting vat 5, collecting vat 5 and alkali storage tank 6 pass through the pipeline intercommunication, make waste water in the collecting vat 5 mix in the pipeline with the NaOH of alkali storage tank, make waste water pH value between 11-12, mixed liquid between them passes through the tee bend and gets into in first safety filter 7 by pump 17, get into the pipeline of connecting deamination device 9 after filtering, after will mixing liquid fully mixing through pipeline mixer 10, get into deamination device 9, waste water gets into in membrane module 93 from mixed liquid import 97 at the deamination jar body 91 top, make the ammonia in the waste water spill over, get into the inner chamber 92 between jar body 91 and the membrane module 93, waste water after the processing gets into next stage deamination jar from jar body 91 bottom mixed liquid export 95. At this time, the sulfuric acid solution in the acid storage tank 16 is pumped into the second cartridge filter 15 through the pump 17, and after being filtered, the sulfuric acid solution enters the inner cavity 92 from the acid inlet 96 at the lower end of the outer side of the tank 91 of the deamination device 9 through the pipeline, and reacts with the ammonia gas in the inner cavity 92, so that the ammonia gas and the sulfuric acid in the inner cavity 92 are fully absorbed to form NH4HSO4Or (NH)4)2SO4And (3) recovering, namely after the deamination treatment of the wastewater in the last stage deamination tank is completed, setting a mixed liquid outlet 95 from the bottom of the tank body 91 and allowing the mixed liquid to flow out, and allowing the mixed liquid to enter a clear water collecting tank 14 to complete the ammonia nitrogen removal treatment process of the whole alkaline etching wastewater.
Example 1:
injecting alkaline etching wastewater of a certain circuit board factory of Shenzhen into an adjusting tank 1, wherein the ammonia nitrogen content in the wastewater is 1986.7mg/L, the copper content is 260.2mg/L, adding sulfuric acid into the adjusting tank 1, measuring according to the wastewater treatment capacity of 1.0T, and the amount of the sulfuric acid absorbing ammonia is 10 wt%, adjusting the pH value to 5.0, then adding PAC and PAM to complete flocculation and precipitation, performing filter pressing on the obtained water through a filter press 2, allowing supernatant in the adjusting tank 1 to enter an active carbon tank 41 and a two-stage resin tank 42 to be filtered, allowing the obtained water to enter a collecting tank 5, allowing the obtained wastewater in the collecting tank 5 to flow out, mixing the obtained water with an alkaline solution tank 7, filtering the obtained water with the ammonia nitrogen content of 0.9mg/L and the copper content of less than 0.1mg/L in a clear water 14, and according with the effluent standard after the obtained water is subjected to three-stage deamination treatment through a deamination device 9.
Example 2:
injecting alkaline etching wastewater of a certain circuit board factory of Shenzhen into an adjusting tank 1, wherein the ammonia nitrogen content in the wastewater is 1986.7mg/L, the copper content is 260.2mg/L, adding sulfuric acid into the adjusting tank 1, measuring according to the wastewater treatment capacity of 1.5T, and the amount of the sulfuric acid absorbing ammonia gas is 20 wt%, adjusting the pH value to 6.0, then adding PAC and PAM to complete flocculation and precipitation, performing filter pressing on the obtained water through a filter press 2 to obtain water, enabling supernatant in the adjusting tank 1 to enter an active carbon tank 41 and a two-stage resin tank 42 to be filtered, enabling the obtained water to enter a collecting tank 5, enabling the obtained water discharged from the collecting tank 5 to be mixed with an alkaline solution tank 7, filtering the obtained water by a first security filter 7, performing three-stage deamination treatment through a deamination device 9, and measuring to obtain the ammonia nitrogen content of water and ammonia in clear water 14, wherein the copper content is less than 0.1mg/L, and the obtained meets the effluent standard.
The above-described embodiments of the present invention are merely exemplary and not intended to limit the present invention, and those skilled in the art may make various modifications, substitutions and improvements without departing from the spirit of the present invention.
Claims (10)
1. Alkaline etching waste water ammonia nitrogen remove device, its characterized in that, including pH value in the adjustable tank and add equalizing basin, liquid storage tank, filter tank, collecting vat that has alkali lye alkali storage tank, deamination device and has the acid storage tank of acidizing fluid, be equipped with the agitator in the equalizing basin, the equalizing basin the liquid storage tank filter tank with the collecting vat passes through the pipeline and connects according to the preface, the collecting vat delivery port with the alkali lye outlet interconnect of alkali storage tank passes through the tube coupling deamination device, the deamination device passes through the pipeline and is connected with the clear water collecting vat, simultaneously with the acid storage tank passes through the tube coupling and forms circulation path.
2. The ammonia nitrogen removal device for alkaline etching wastewater as claimed in claim 1, wherein the filtration tank comprises an activated carbon tank and a resin tank which are connected in sequence, and a water inlet of the activated carbon tank is connected with a water outlet of the liquid storage tank; the resin tank is a first resin tank and a second resin tank which are connected in series, a water inlet of the first resin tank is connected with a water outlet of the activated carbon tank, and a water outlet of the second resin tank is connected with a liquid inlet of the collecting tank.
3. The ammonia nitrogen removing device for the alkaline etching wastewater as claimed in claim 1, wherein the ammonia removing device comprises three ammonia removing tanks connected in series, each ammonia removing tank comprises a tank body with an inner cavity, each ammonia removing tank inner cavity is provided with a membrane module connected with the alkali storage tank, the membrane module is provided with a ammonia removing membrane capable of leaching ammonia gas, the tank body is connected with the acid storage tank, and a sulfuric acid solution pumped by the acid storage tank is filled between the outer wall of the membrane module and the inner wall of the tank body.
4. The ammonia nitrogen removing device for the alkaline etching wastewater as claimed in any one of claims 1 to 3, wherein a pipeline mixer which can uniformly mix the wastewater and the alkali liquor is arranged on a pipeline entering the deamination device.
5. The ammonia nitrogen removing device for the alkaline etching wastewater as claimed in any one of claims 1 to 3, wherein a first safety filter is arranged on a pipeline entering the deamination device.
6. The ammonia nitrogen removing device for the alkaline etching wastewater as claimed in claim 5, wherein a pressure gauge is arranged on the first safety filter.
7. The ammonia nitrogen removing device for the alkaline etching wastewater as claimed in any one of claims 1 to 3, wherein a second security filter is arranged on a pipeline connecting the acid storage tank and the deamination device.
8. The ammonia nitrogen removing device for alkaline etching wastewater as claimed in claim 7, wherein a pressure gauge is arranged on the second cartridge filter.
9. The ammonia nitrogen removing device for the alkaline etching wastewater as claimed in any one of claims 1 to 3, wherein a conductivity meter and a pH meter are arranged on the acid storage tank and a pipeline entering the deamination device.
10. The ammonia nitrogen removing device for the alkaline etching wastewater as set forth in any one of claims 1 to 3, wherein a flow meter is further arranged on a pipeline entering the deamination device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122409307.5U CN215855532U (en) | 2021-09-30 | 2021-09-30 | Ammonia nitrogen removing device for alkaline etching wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122409307.5U CN215855532U (en) | 2021-09-30 | 2021-09-30 | Ammonia nitrogen removing device for alkaline etching wastewater |
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| Publication Number | Publication Date |
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| CN215855532U true CN215855532U (en) | 2022-02-18 |
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| CN202122409307.5U Active CN215855532U (en) | 2021-09-30 | 2021-09-30 | Ammonia nitrogen removing device for alkaline etching wastewater |
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2021
- 2021-09-30 CN CN202122409307.5U patent/CN215855532U/en active Active
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