CN211688362U - PCB board alkaline etching waste liquid processing system - Google Patents
PCB board alkaline etching waste liquid processing system Download PDFInfo
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- CN211688362U CN211688362U CN202020164833.2U CN202020164833U CN211688362U CN 211688362 U CN211688362 U CN 211688362U CN 202020164833 U CN202020164833 U CN 202020164833U CN 211688362 U CN211688362 U CN 211688362U
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Abstract
The utility model provides a PCB alkaline etching waste liquid treatment system, which comprises a waste liquid storage tank, a deamination tower and an ammonia absorption tower; a heat exchanger is arranged between the waste liquid storage tank and the deamination tower, the heat exchanger is provided with a first feeding hole, a first discharging hole, a second feeding hole and a second discharging hole, the first feeding hole is communicated with the waste liquid storage tank, and the first discharging hole is communicated with the deamination tower; the deamination tower overcoat is equipped with the heat transfer sleeve pipe, and heat transfer sleeve pipe one end is provided with the steam inlet that is used for leading-in steam, and the heat transfer sleeve pipe other end is provided with the comdenstion water export, and the comdenstion water export communicates with the second feed inlet of heat exchanger, and the second discharge gate of heat exchanger is used for deriving the cooling water. The utility model discloses a PCB board basicity etching waste liquid processing system, the basicity etching waste liquid that produces in the mainly used processing PCB board production process, this processing system can the effectual ammonia of retrieving in the basicity etching waste liquid to can effectual saving energy consumption.
Description
Technical Field
The utility model relates to a PCB board waste water treatment field particularly, relates to a PCB board basicity etching waste liquid processing system.
Background
The production process of the PCB is complex, and different types of waste liquid can be generated at different stages of the production process, including acidic etching waste liquid, alkaline etching waste liquid, organic waste liquid, tin-containing waste liquid, nickel-containing waste liquid, micro-etching waste liquid and the like; because various waste liquids have different components and different properties, and the corresponding treatment modes of the waste liquids are different, different waste liquid treatment systems are often required to be configured in a PCB production enterprise so as to achieve good treatment effects on different types of waste liquids.
The alkaline etching waste liquid is the most main waste liquid in PCB production, and the method for treating the alkaline etching waste liquid in the prior art mainly comprises two methods, wherein one method is a method for producing basic copper carbonate by neutralizing the acidic etching waste liquid; the other method is to recycle ammonia in the alkaline etching waste liquid so as to achieve the purpose of removing ammonia nitrogen in the alkaline etching waste liquid, the recycled ammonia can also be used for preparing a new etching sub-liquid with ammonium chloride solid generated by the treatment of the acidic etching waste liquid, and the treatment method can achieve the purpose of recycling waste and has good economic benefit.
However, the existing alkaline etching waste liquid is directly introduced into the deamination tower with hot steam during deamination, the hot steam is directly contacted with the waste liquid to heat the waste liquid and is discharged together with the waste liquid after deamination is finished, and the mode does not have good heat energy of steam, and makes clean steam mix into the waste water, thereby increasing the amount of the waste water and further increasing the subsequent treatment pressure of the waste water.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a PCB board basicity etching waste liquid processing system, the basicity etching waste liquid that produces in the mainly used processing PCB board production process, this processing system can the effectual ammonia of retrieving in the basicity etching waste liquid to can effectual saving energy consumption.
The embodiment of the utility model is realized like this:
a PCB board alkaline etching waste liquid treatment system comprises a waste liquid storage tank, a deamination tower and an ammonia absorption tower; a heat exchanger is arranged between the waste liquid storage tank and the deamination tower, the heat exchanger is provided with a first feeding hole, a first discharging hole, a second feeding hole and a second discharging hole, the first feeding hole is communicated with the waste liquid storage tank, and the first discharging hole is communicated with the deamination tower; the deamination tower overcoat is equipped with the heat transfer sleeve pipe, and heat transfer sleeve pipe one end is provided with the steam inlet that is used for leading-in steam, and the heat transfer sleeve pipe other end is provided with the comdenstion water export, and the comdenstion water export communicates with the second feed inlet of heat exchanger, and the second discharge gate of heat exchanger is used for deriving the cooling water.
Further, the steam inlet is communicated with a steam outlet of an MVR evaporation concentration system of the acidic etching waste liquid treatment system.
Further, the heat exchange sleeve is arranged close to the bottom of the deamination tower.
Further, a liquid supply pipe is arranged between the first discharge port and the deamination tower, a liquid supply pump is arranged on the liquid supply pipe, one end of the liquid supply pipe, which is far away from the first discharge port, extends into the deamination tower and is communicated with a spray head, and the spray head is arranged close to the top of the deamination tower and is used for spraying waste liquid to the bottom of the deamination tower; the bottom of the deamination tower is in conduction connection with a waste liquid collecting tank through a first liquid outlet pipe, and a liquid outlet electromagnetic valve is arranged on the first liquid outlet pipe; the top of the deamination tower is connected with a gas pipe in a conduction way, and one end of the gas pipe, which is far away from the deamination tower, is communicated with the bottom of the ammonia absorption tower.
Furthermore, the liquid supply pipe comprises a main liquid supply pipe and a branch liquid supply pipe, and the liquid supply pump is arranged on the branch liquid supply pipe; the deamination tower has still set first circulating pipe, and first circulating pipe one end switches on with deamination tower bottom, and the first circulating pipe other end and confession liquid are responsible for the intercommunication.
Further, a negative pressure generating device is arranged on the gas transmission pipe.
Furthermore, the ammonia absorption tower is provided with a water supply device, the water supply device comprises a water supply tank, a water supply pipe and a water supply pump arranged on the water supply pipe, one end of the water supply pipe is communicated with the water supply tank, the other end of the water supply pipe is communicated with a water distributor, and the water distributor is arranged in the ammonia absorption tower and is close to the top of the ammonia absorption tower; the water distributors are provided with a plurality of water distributors which are uniformly distributed along the height direction of the ammonia absorption tower; the water distributors are communicated and connected with the water supply pipe.
Furthermore, a water distributor comprises a water distribution pipe, the water distribution pipe is horizontally arranged and penetrates through the central shaft of the ammonia absorption tower, a plurality of water distribution nozzles are uniformly communicated and connected to the water distribution pipe, and the water distribution nozzles are uniformly distributed along the length direction of the water distribution pipe.
Furthermore, the water supply pipe comprises a main water supply pipe and a branch water supply pipe which are communicated, the water distributor is communicated with the branch water supply pipe, and the water supply pump is arranged on the branch water supply pipe; the ammonia absorption tower is provided with a second circulating pipe, one end of the second circulating pipe is communicated with the bottom of the ammonia absorption tower, and the other end of the second circulating pipe is communicated with a water supply main pipe.
The water supply branch pipe is communicated with a second liquid outlet pipe, the second liquid outlet pipe is communicated with the water supply branch pipe on one side, away from the main water supply pipe, of the water supply pump, and one end, away from the water supply branch pipe, of the second liquid outlet pipe is communicated with the sub-liquid batching tank; a three-way valve is communicated between the water supply branch pipe and the second liquid outlet pipe, and a water supply electromagnetic valve is arranged at one end of the water supply main pipe close to the water supply groove.
The utility model has the advantages that:
the utility model discloses a PCB board alkaline etching waste liquid processing system, at first change the mode of prior art direct heat supply steam to in the deamination tower into the mode of replacing the heating of heat sleeve pipe in the deamination tower peripheral hardware, can directly discharge after making the hot steam condensate and need not to sneak into the processing load that increases the waste liquid in the waste liquid; secondly, this embodiment sets up the heat exchanger between waste liquid storage tank and deamination tower, and the comdenstion water that utilizes heat transfer sleeve to derive preheats the waste liquid of flowing through the heat exchanger, abundant utilization the heat energy that steam produced. To sum up, the utility model discloses a PCB board alkaline etching waste liquid processing system makes whole deamination process practice thrift the energy consumption and reduce the treatment cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 shows a PCB alkaline etching waste liquid treatment system according to an embodiment of the present invention.
Icon:
10-a waste liquid storage tank, 20-a heat exchanger, 21-a first inlet, 22-a first outlet, 23-a second inlet, 24-a second outlet, 30-a deamination tower, 31-a heat exchange sleeve, 32-a steam inlet, 33-a condensed water outlet, 41-a main liquid supply pipe, 42-a branch liquid supply pipe, 43-a liquid supply pump, 44-a first circulating pipe, 45-a spray header, 51-a first liquid outlet pipe, 52-a waste liquid collecting tank, 53-a liquid outlet electromagnetic valve, 61-a gas pipe, 62-a negative pressure fan, 70-an ammonia absorption tower, 71-an exhaust port, 72-a water distribution pipe, 73-a water distribution spray head, 81-a water supply tank, 82-a water supply pump, 83-a water supply electromagnetic valve, 84-a main water supply pipe and 85-a branch water supply pipe, 86-a second circulating pipe, 87-a second liquid outlet pipe, 88-a three-way valve and 90-a liquid dosing tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
The present invention will be further described with reference to the accompanying drawings, and as shown in fig. 1, the present embodiment provides a PCB alkaline etching waste liquid treatment system, which includes a waste liquid storage tank 10, a deamination tower 30 and an ammonia absorption tower 70; a heat exchanger 20 is arranged between the waste liquid storage tank 10 and the deamination tower 30, the heat exchanger 20 is provided with a first feeding hole 21, a first discharging hole 22, a second feeding hole 23 and a second discharging hole 24, the first feeding hole 21 is communicated with the waste liquid storage tank 10, and the first discharging hole 22 is communicated with the deamination tower 30; the deamination tower 30 is sleeved with a heat exchange sleeve 31, one end of the heat exchange sleeve 31 is provided with a steam inlet 32 for leading in steam, the other end of the heat exchange sleeve 31 is provided with a condensed water outlet 33, the condensed water outlet 33 is communicated with the second feed inlet 23 of the heat exchanger 20, and the second discharge outlet 24 of the heat exchanger 20 is used for leading out cooling water.
In the PCB alkaline etching waste liquid treatment system of the embodiment, the waste liquid enters the deamination tower 30 from the waste liquid storage tank 10 to remove ammonia, and the removed ammonia enters the ammonia absorption tower 70 to absorb ammonia, so that ammonia recovery from the alkaline etching waste liquid is completed. The difference between the present embodiment and the prior art is: establish heat transfer sleeve pipe 31 at deamination tower 30 overcoat, the waste liquid of hot steam flow in to deamination tower 30 through heat transfer sleeve pipe 31 heats, and set up heat exchanger 20 between waste liquid storage tank 10 and deamination tower 30, the high temperature comdenstion water that produces after the condensation of hot steam lets in heat exchanger 20, preheat the alkaline etching waste liquid through heat exchanger 20, make the heat energy of hot steam obtain abundant utilization, the cooling water behind heat exchanger 20 is pure liquid water, can directly discharge or be used for other places, if the factory building washs, equipment washs etc., and can not get into in the waste liquid like prior art, increase the processing load of waste liquid, make whole deamination process practice thrift the energy consumption and reduce treatment cost.
In order to further minimize the energy consumption of the whole plant, the vapor inlet 32 of the present embodiment is communicated with the vapor outlet of the MVR evaporation and concentration system of the acid etching waste liquid treatment system. The vapor generated by the MVR evaporation concentration system is fully utilized as the heat source of the deamination process, and the full utilization of energy is ensured.
Because waste liquid is mainly concentrated in the bottom of the tower among the deamination tower 30, so this application is close to the setting of deamination tower 30 bottom with heat transfer sleeve pipe 31. So as to ensure the full heating of the waste liquid in the tower.
The concrete structure of the deamination tower 30 of the embodiment is as follows: a liquid supply pipe is arranged between the first discharge hole 22 and the deamination tower 30, a liquid supply pump 43 is arranged on the liquid supply pipe, one end of the liquid supply pipe, which is far away from the first discharge hole 22, extends into the deamination tower 30 and is communicated with a spray header 45, and the spray header 45 is arranged near the top of the deamination tower 30 and is used for spraying waste liquid to the bottom of the deamination tower 30; the bottom of the deamination tower 30 is in conduction connection with a waste liquid collecting tank 52 through a first liquid outlet pipe 51, and a liquid outlet electromagnetic valve 53 is arranged on the first liquid outlet pipe 51; the top of the deammoniation tower 30 is connected with a gas pipe 61 in a conduction way, and one end of the gas pipe 61 far away from the deammoniation tower 30 is communicated with the bottom of the ammonia absorption tower 70. The waste liquid is sprayed into the tower from a spray header 45 at the top of the deamination tower 30, the waste liquid is dispersed into liquid drops in the tower body, the liquid drops are heated to improve the deamination efficiency, the generated ammonia gas is discharged from a gas pipe 61 at the top of the tower and enters an ammonia absorption tower 70, and the deaminated waste liquid is discharged from a first liquid outlet pipe 51 at the bottom of the tower and enters the next procedure.
It should be noted that, in order to enable ammonia in the waste liquid to be sufficiently and effectively removed, the liquid supply pipe is divided into a liquid supply main pipe 41 and a liquid supply branch pipe 42 in the embodiment, and the liquid supply pump 43 is arranged on the liquid supply branch pipe 42; the deamination tower 30 is also provided with a first circulating pipe 44, one end of the first circulating pipe 44 is communicated with the bottom of the deamination tower 30, and the other end of the first circulating pipe 44 is communicated with the liquid supply main pipe 41. The waste liquid is repeatedly deaminated by the arrangement of the first circulating pipe 44, the circulating time can be determined according to factors such as the actual ammonia content of the waste liquid, and when the deamination meets the requirement, the liquid outlet electromagnetic valve 53 is opened to discharge the deaminated waste liquid.
It should be noted that the air pipe 61 of the present embodiment is provided with a negative pressure generating device. Specifically, the negative pressure generating device can be a negative pressure fan 62, and the negative pressure generating device is used for generating negative pressure in the gas transmission pipe 61 and promoting ammonia gas generated in the deamination tower 30 to smoothly and efficiently enter the gas transmission pipe 61.
The ammonia absorption in this embodiment is performed by water absorption, and in this embodiment, the ammonia absorption tower 70 is provided with a water supply device, which includes a water supply tank 81, a water supply pipe and a water supply pump 82 provided on the water supply pipe, one end of the water supply pipe is communicated with the water supply tank 81, the other end of the water supply pipe is communicated with a water distributor, and the water distributor is provided in the ammonia absorption tower 70 and near the top of the ammonia absorption tower 70; the water distributors are provided with a plurality of water distributors which are uniformly distributed along the height direction of the ammonia absorption tower 70; the water distributors are communicated and connected with the water supply pipe. Adopt the water-locator to spray liquid water in ammonia absorption tower 70, help liquid water to disperse evenly in ammonia absorption tower 70 to can carry out effectual absorption to the ammonia of scattering in whole ammonia absorption tower 70, many water-distributors evenly distributed in vertical direction can realize the multiple absorption to the ammonia, guarantee the absorptivity.
In order to prevent the internal pressure of the ammonia absorption tower 70 from being excessively high, an exhaust port 71 is further provided at the top of the ammonia absorption tower 70.
The water distributor of this embodiment's concrete structure does: a water distributor comprises a water distribution pipe 72, the water distribution pipe 72 is horizontally arranged and passes through the central shaft of the ammonia absorption tower 70, a plurality of water distribution nozzles 73 are evenly connected on the water distribution pipe 72 in a communication way, and the plurality of water distribution nozzles 73 are evenly distributed along the length direction of the water distribution pipe 72. Besides, the water distributor of the embodiment can be replaced by the following structure: the water distributor comprises a main water distribution pipe and a plurality of pairs of branch water distribution pipes, the plurality of pairs of branch water distribution pipes are uniformly distributed along the length direction of the main water distribution pipe, and the pair of branch water distribution pipes are symmetrically distributed along the central axis of the main water distribution pipe; one water distribution pipe is communicated with a plurality of water distribution nozzles which are uniformly distributed, and the water outlet ends of the water distribution nozzles face the bottom of the ammonia absorption tower 70. The structure of the water distributor is arranged, so that the water distribution is uniform, and the absorption efficiency is improved.
In order to ensure the sufficient absorption of ammonia gas by water, the water supply pipe of the embodiment includes a main water supply pipe 84 and a branch water supply pipe 85 which are connected in a conducting manner, a water distributor is communicated with the branch water supply pipe 85, and a water supply pump 82 is arranged on the branch water supply pipe 85; the ammonia absorption tower 70 is provided with a second circulation pipe 86, one end of the second circulation pipe 86 is communicated with the bottom of the ammonia absorption tower 70, and the other end of the second circulation pipe 86 is communicated with the water supply main pipe 84. The ammonia water which has absorbed a certain amount of ammonia gas is reintroduced into the water distribution pipe 72 for spraying, and the ammonia gas is reabsorbed until the ammonia water is saturated.
The liquid distributing tank 90 is further included in the embodiment, the water supply branch pipe 85 is further communicated with a second liquid outlet pipe 87, the second liquid outlet pipe 87 is communicated with the water supply branch pipe 85 on the side, away from the water supply main pipe 84, of the water supply pump 82, and one end, away from the water supply branch pipe 85, of the second liquid outlet pipe 87 is communicated with the liquid distributing tank 90; a three-way valve 88 is communicated between the water supply branch pipe 85 and the second liquid outlet pipe 87, and a water supply electromagnetic valve 83 is arranged at one end of the water supply main pipe 84 close to the water supply tank 81. When the ammonia water is saturated, the water supply electromagnetic valve 83 is closed, the three-way valve 88 is adjusted to enable the second circulating pipe 86 and the second liquid outlet pipe 87 to be communicated, the saturated ammonia water in the ammonia absorption tower 70 sequentially passes through the second circulating pipe 86, the water supply main pipe 84 and the second liquid outlet pipe 87, finally enters the sub-liquid batching tank 90 through the second liquid outlet pipe 87, and is prepared into etching sub-liquid together with solid ammonium chloride obtained by the acidic etching waste liquid treatment system, and the etching sub-liquid is used by a PCB production system, so that the purpose of recycling waste is achieved.
In conclusion, the alkaline waste etching solution treatment system for the PCB is simply improved on the basis of the prior art, achieves the purposes of saving energy, reducing consumption and reducing cost, and has good practicability.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a PCB board alkaline etching waste liquid processing system which characterized in that: comprises a waste liquid storage tank, a deamination tower and an ammonia absorption tower;
a heat exchanger is arranged between the waste liquid storage tank and the deamination tower, the heat exchanger is provided with a first feeding hole, a first discharging hole, a second feeding hole and a second discharging hole, the first feeding hole is communicated with the waste liquid storage tank, and the first discharging hole is communicated with the deamination tower;
the deamination tower overcoat is equipped with the heat transfer sleeve pipe, heat transfer sleeve pipe one end is provided with the steam inlet that is used for leading-in steam, the heat transfer sleeve pipe other end is provided with the comdenstion water export, the comdenstion water export with the heat exchanger the second feed inlet intercommunication, the heat exchanger the second discharge gate is used for deriving the cooling water.
2. The PCB alkaline etching waste liquid treatment system of claim 1, wherein: and the steam inlet is communicated with a steam outlet of an MVR evaporation concentration system of the acidic etching waste liquid treatment system.
3. The PCB alkaline etching waste liquid treatment system of claim 1, wherein: the heat exchange sleeve is arranged close to the bottom of the deamination tower.
4. The PCB alkaline etching waste liquid treatment system of claim 1, wherein: a liquid supply pipe is arranged between the first discharge port and the deamination tower, a liquid supply pump is arranged on the liquid supply pipe, one end of the liquid supply pipe, which is far away from the first discharge port, extends into the deamination tower and is communicated with a spray header, and the spray header is arranged close to the top of the deamination tower and is used for spraying waste liquid to the bottom of the deamination tower;
the bottom of the deamination tower is in conduction connection with a waste liquid collecting tank through a first liquid outlet pipe, and a liquid outlet electromagnetic valve is arranged on the first liquid outlet pipe;
the top of the deamination tower is connected with a gas pipe in a conduction mode, and one end, far away from the deamination tower, of the gas pipe is communicated with the bottom of the ammonia absorption tower.
5. The PCB alkaline etching waste liquid treatment system of claim 4, wherein: the liquid supply pipe comprises a main liquid supply pipe and a branch liquid supply pipe, and the liquid supply pump is arranged on the branch liquid supply pipe;
the deamination tower has still set first circulating pipe, first circulating pipe one end with deamination tower bottom switches on, the first circulating pipe other end with supply liquid and be responsible for the intercommunication.
6. The PCB alkaline etching waste liquid treatment system of claim 4, wherein: the air delivery pipe is provided with a negative pressure generating device.
7. The PCB alkaline etching waste liquid treatment system of claim 5, wherein: the ammonia absorption tower is provided with a water supply device, the water supply device comprises a water supply tank, a water supply pipe and a water supply pump arranged on the water supply pipe, one end of the water supply pipe is communicated with the water supply tank, the other end of the water supply pipe is communicated with a water distributor, and the water distributor is arranged in the ammonia absorption tower and close to the top of the ammonia absorption tower;
the water distributors are provided with a plurality of pieces which are uniformly distributed along the height direction of the ammonia absorption tower; and the water distributors are communicated and connected with the water supply pipe.
8. The PCB alkaline etching waste liquid treatment system of claim 7, wherein: the water distributor comprises a water distribution pipe, the water distribution pipe is horizontally arranged and penetrates through the central shaft of the ammonia absorption tower, a plurality of water distribution spray heads are uniformly connected on the water distribution pipe in a communication mode, and the water distribution spray heads are uniformly distributed along the length direction of the water distribution pipe.
9. The PCB alkaline etching waste liquid treatment system of claim 7, wherein: the water supply pipe comprises a main water supply pipe and a branch water supply pipe which are communicated, the water distributor is communicated with the branch water supply pipe, and the water supply pump is arranged on the branch water supply pipe;
the ammonia absorption tower is provided with a second circulating pipe, one end of the second circulating pipe is communicated with the bottom of the ammonia absorption tower, and the other end of the second circulating pipe is communicated with the water supply main pipe.
10. The PCB alkaline etching waste liquid treatment system of claim 9, wherein: the secondary liquid distribution tank is also arranged, the water supply branch pipe is also communicated with a second liquid outlet pipe, the second liquid outlet pipe is communicated with the water supply branch pipe on the side, away from the main water supply pipe, of the water supply pump, and one end, away from the water supply branch pipe, of the second liquid outlet pipe is communicated with the secondary liquid distribution tank;
a three-way valve is communicated between the water supply branch pipe and the second liquid outlet pipe, and a water supply electromagnetic valve is arranged at one end of the water supply main pipe close to the water supply groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020164833.2U CN211688362U (en) | 2020-02-12 | 2020-02-12 | PCB board alkaline etching waste liquid processing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020164833.2U CN211688362U (en) | 2020-02-12 | 2020-02-12 | PCB board alkaline etching waste liquid processing system |
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| CN211688362U true CN211688362U (en) | 2020-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314967A (en) * | 2021-12-30 | 2022-04-12 | 广东省水利水电第三工程局有限公司 | Device and method for treating ultrahigh ammonia nitrogen sewage |
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2020
- 2020-02-12 CN CN202020164833.2U patent/CN211688362U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314967A (en) * | 2021-12-30 | 2022-04-12 | 广东省水利水电第三工程局有限公司 | Device and method for treating ultrahigh ammonia nitrogen sewage |
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