阅读说明：本技术 污水管道硫化物和甲烷处理系统和处理方法 (Sewage pipeline sulfide and methane treatment system and method ) 是由 刘艳臣 左志强 郑敏 于 2020-06-01 设计创作，主要内容包括：本发明涉及污水管道领域,公开了污水管道硫化物和甲烷处理系统和处理方法。该处理系统包括：尿液收集池,尿液收集池用于收集并水解原位尿液以提高原位尿液中游离氨的浓度,让尿液投加到待处理管段,抑制污水管道的生物膜或沉积物活性。该处理方法包括：S1、收集原位尿液；S2、将步骤S1收集到的原位尿液水解以提高原位尿液中游离氨的浓度；S3、将步骤S2中水解后的尿液投加至污水管道中,通过接触以抑制污水管道的生物膜或沉积物活性。本发明利用原位尿液实现了污水管道硫化物和甲烷产生的控制；不依靠化学药剂的投加就可以实现下游污水管道微生物的灭活；成本低廉,操作简单,就地取材,环境友好,对于污水管道维护具有广阔的应用前景。(The invention relates to the field of sewage pipelines, and discloses a system and a method for treating sulfide and methane in a sewage pipeline. The processing system comprises: the urine collecting tank is used for collecting and hydrolyzing the in-situ urine so as to improve the concentration of free ammonia in the in-situ urine, and the urine is added to the pipe section to be treated to inhibit the activity of a biological film or sediment of a sewage pipeline. The processing method comprises the following steps: s1, collecting in-situ urine; s2, hydrolyzing the in-situ urine collected in the step S1 to increase the concentration of free ammonia in the in-situ urine; s3, adding the urine hydrolyzed in the step S2 into a sewage pipeline, and inhibiting the activity of the biological membrane or sediment of the sewage pipeline through contact. The invention realizes the control of the generation of sulfide and methane in the sewage pipeline by using the in-situ urine; the microorganism of the downstream sewage pipeline can be inactivated without depending on the addition of chemical agents; the method has the advantages of low cost, simple operation, local material utilization, environmental friendliness and wide application prospect for sewage pipeline maintenance.)

1. A sewer sulfide and methane treatment system, comprising: the urine collecting pit, the export of urine collecting pit and pending sewage pipe intercommunication, or transport the urine to pending sewage pipe section through conveyor, the urine collecting pit is used for collecting and hydrolysising the normal position urine in order to improve the concentration of free ammonia in the normal position urine, restraines sewage pipe's biomembrane or deposit activity.

2. The sewer sulfide and methane treatment system of claim 1, wherein the urine collection tank is closed.

3. The sewer sulfide and methane treatment system of claim 1, further comprising a first concentration monitoring device disposed at an outlet of the urine collection tank and a second concentration monitoring device disposed within the sewer to be treated.

4. The sewer pipeline sulfide and methane treatment system of claim 1, further comprising a dosing device, wherein the outlet of the urine collection tank is in communication with the sewer pipeline to be treated through the dosing device, and the dosing device is oriented toward a position to be treated of the sewer pipeline to be treated.

5. The sewer sulfide and methane treatment system of any of claims 1-4, further comprising a feces-urine separator through which the inlet of the urine collection basin communicates with a sewer line of a sanitary toilet.

6. A method of treating a sewer sulfide and methane treatment system according to any of claims 1-5, comprising:

s1, collecting in-situ urine;

s2, hydrolyzing the in-situ urine collected in the step S1 to increase the concentration of free ammonia in the in-situ urine;

s3, adding the urine hydrolyzed in the step S2 into a sewage pipeline, and inhibiting the activity of the biological membrane or sediment of the sewage pipeline through contact.

7. The method of processing a sewer sulfide and methane processing system of claim 6, wherein in step S2:

the concentration of free ammonia in the in situ urine is increased by closed hydrolysis of the in situ urine for 3 to 7 days.

8. The method of processing a sewer sulfide and methane processing system of claim 6, wherein in step S3:

and adding the hydrolyzed urine into a sewage pipeline, contacting with a biological membrane or sediment for 24 hours, and setting the adding interval period to be one week.

9. The method of treating a sewer sulfide and methane treatment system of claim 6,

in step S2:

the value range of the ammonia nitrogen concentration of the hydrolyzed urine is 2000-6000mg N/L;

in step S3:

adding the hydrolyzed urine into a sewage pipeline, wherein the ammonia nitrogen concentration after the urine is diluted by sewage is not less than 500mg N/L, and the free ammonia concentration is not less than 150mg NH₃-N/L。

Technical Field

The invention relates to the field of sewage pipelines, in particular to a system and a method for treating sulfide and methane in a sewage pipeline.

Background

Sewer pipes are one of the important infrastructures of modern society. However, there are two concerns in the daily operation of sewer systems. The first is sulfide, which is a reduction product produced by Sulfate-Reducing Bacteria (SRB) using Sulfate and organic substances in wastewater. The conversion of dissolved sulfides into hydrogen sulfide causes corrosion of the pipeline concrete, reduces the service life of the sewer, causes significant losses, and causes serious odor and health problems. The second problem is methane, which is mainly produced by Methanogenic Archaea (MA). Methane is a strong greenhouse gas, and the reduction of methane production is the key to controlling its emission to the atmosphere. In addition, the production of both sulfide and methane consumes organic carbon in wastewater, thus contributing to the carbon source deficiency of downstream sewage treatment plants.

Previous studies have demonstrated that inhibition of SRB and MA activity is the most effective method for controlling sewer sulfide and methane. The current inhibition methods are mainly based on the addition of chemicals, including magnesium hydroxide, iron salts, nitrites and nitrates. However, the continuous addition of these chemicals is very expensive in terms of industrial economics and is cost prohibitive for pipeline maintenance.

Disclosure of Invention

Technical problem to be solved

The embodiment of the invention aims to provide a system and a method for treating sulfide and methane in a sewage pipeline, which aim to solve the technical problems of high consumption and high cost of added chemicals in the prior art.

(II) technical scheme

In order to solve the above technical problem, an embodiment of the present invention provides a system for treating sulfide and methane in a sewage pipeline, including: the urine collecting pit, the export and the pending sewage pipe intercommunication of urine collecting pit, or transport the urine to pending sewage pipe section through conveyor, the urine collecting pit is used for collecting and hydrolysising the concentration of free ammonia in the normal position urine in order to improve the normal position urine, restraines sewage pipe's biomembrane activity.

Wherein, the urine collecting tank is closed.

The device comprises a urine collecting pool, a first concentration monitoring device and a second concentration monitoring device, wherein the first concentration monitoring device is arranged at an outlet of the urine collecting pool, and the second concentration monitoring device is arranged in a sewage pipeline to be treated.

The device comprises a urine collecting tank, a to-be-treated sewage pipeline and a feeding device, wherein the device also comprises the feeding device, the outlet of the urine collecting tank is communicated with the to-be-treated sewage pipeline through the feeding device, and the feeding device faces to the to-be-treated position of the to-be-treated sewage pipeline.

The excrement collecting pool comprises a excrement collecting pool body, a excrement collecting pool body and a urine collecting pool body, wherein the excrement collecting pool body is arranged in the excrement collecting pool body, the excrement collecting pool body is arranged in the excrement collecting pool.

The embodiment of the invention also discloses a treatment method of the sulfide and methane treatment system of the sewage pipeline, which comprises the following steps:

s1, collecting in-situ urine;

s2, hydrolyzing the in-situ urine collected in the step S1 to increase the concentration of free ammonia in the in-situ urine;

s3, adding the urine hydrolyzed in the step S2 into a sewage pipeline, and inhibiting the activity of the biological membrane or sediment of the sewage pipeline through contact.

Wherein, in step S2:

the concentration of free ammonia in the in situ urine is increased by closed hydrolysis of the in situ urine for 3 to 7 days.

Wherein, in step S3:

and adding the hydrolyzed urine into a sewage pipeline, contacting with a biological membrane or sediment for 24 hours, and setting the adding interval period to be one week.

Wherein the content of the first and second substances,

in step S2:

the value range of the ammonia nitrogen concentration of the hydrolyzed urine is 2000-6000mg N/L;

in step S3:

adding the hydrolyzed urine into a sewage pipeline, wherein the ammonia nitrogen concentration after the urine is diluted by sewage is not less than 500mg N/L, and the free ammonia concentration is not less than 150mg NH₃-N/L。

(III) advantageous effects

According to the system and the method for treating sulfide and methane in the sewage pipeline, provided by the embodiment of the invention, urine with high concentration of free ammonia is obtained by collecting and hydrolyzing in-situ urine in a urine collecting tank, and is put into the sewage pipeline to be treated, and the inactivation of a biological membrane or sediment on the pipe wall is realized through contact, so that the concentrations of sulfide and methane are reduced. According to the embodiment of the invention, the control of sulfide and methane in the sewage pipeline is realized by using the in-situ urine; the strong inactivation of free ammonia to anaerobic biofilms is disclosed for the first time; the inactivation of the biological membrane of the downstream sewage pipeline can be realized without depending on the addition of chemical agents; the method has the advantages of low cost, simple operation, local material utilization, environmental friendliness and wide application prospect for sewage pipeline maintenance.

Drawings

FIG. 1 is a schematic illustration of a sewer sulfide and methane treatment system in accordance with an embodiment of the present invention;

FIG. 2 is a flow chart of a method of treatment of a sewer sulfide and methane treatment system in accordance with an embodiment of the present invention;

FIG. 3 is a graph showing the effect of inactivation of a sewer biofilm using a treatment method according to an embodiment of the present invention;

FIG. 4 is a graph illustrating the effect of treating sewer sulfide and methane using a treatment method according to an embodiment of the present invention.

Reference numerals:

1: a building; 2: a sewer pipeline; 3: a feces-urine separator; 4: a urine collection tank; 5: a valve; 6: a sewage pipeline to be treated.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in FIG. 1, an embodiment of the present invention discloses a sewer sulfide and methane treatment system, comprising: the urine collecting tank 4 is used for collecting and hydrolyzing the in-situ urine so as to improve the concentration of free ammonia in the in-situ urine and inhibit the activity of a biological membrane or sediment of the sewage pipeline, wherein the outlet of the urine collecting tank 4 is communicated with the sewage pipeline 6 to be treated, or the urine is transported to the sewage pipeline section to be treated by a transporting device (for example, a transporting vehicle or a transporting pipeline can be used for carrying out remote transportation).

Specifically, the urine collecting tank 4 of this embodiment is buried under the building 1, the urine collecting tank 4 includes an inlet and an outlet, the inlet of the urine collecting tank 4 is connected with the sewer pipe 2 of the sanitary toilet for collecting the in-situ urine, and the concentration of the free ammonia in the in-situ urine is increased by means of hydrolysis, when the pH value in the urine collecting tank 4 is increased to 9, the urine can be discharged to the sewage pipe 6 to be treated through the outlet of the urine collecting tank 4, and the urine can contact with the biofilm in the sewage pipe to achieve the purpose of inhibiting or killing the biofilm or deposit microorganisms in the pipe, inhibit the generation of sulfate reduction process and anaerobic fermentation methane production process in the pipe network, reduce the concentration of sulfide and methane, realize local material taking, and can continuously treat sulfide and methane.

The urine is transported to the sewage pipe section to be treated by the transporting device, so that a remote feeding strategy can be realized.

Free ammonia (i.e., NH3, abbreviated as FA) is known to be an inhibitor of SRB and MA. The research shows that FA can inhibit microorganisms in an anaerobic digestion system; recent studies have shown that short term (e.g., 1 day) exposure of microorganisms to FA can lead to cell lysis and destruction of cell membrane bound enzymes; it has also been found that FA-based activated sludge treatment can reduce sludge production in wastewater treatment systems. However, FA-based treatment methods are poorly understood in sewers.

With the development of the excrement and urine separation technology, urine can be independently collected for stabilization and resource treatment. The nitrogen in the urine accounts for 80% of the sewage system, and the urine can be simply collected to be applied to control of sulfide and methane in the sewage pipe network system.

The sewer pipe 2 of the sanitary toilet of the sewage pipe system in the embodiment is also directly connected with the sewage pipe, and sewage is directly discharged through the sewage pipe. When the treatment system is used for sewage pipeline treatment, the direct discharge of sewage is not influenced, namely, when urine is used for sewage pipeline treatment, the sewage can be diluted and then contacted with a biological film or sediment. In order to ensure that the concentration of free ammonia in the diluted urine meets the treatment requirement, the concentration of ammonia nitrogen and the concentration of free ammonia in the sewage pipeline can be monitored.

According to the system and the method for treating sulfide and methane in the sewage pipeline, provided by the embodiment of the invention, urine with high concentration of free ammonia is obtained by collecting and hydrolyzing in-situ urine in the urine collecting tank 4, and is put into the sewage pipeline 6 to be treated, and the activity of a biological membrane on the wall of the sewage pipeline is inhibited or killed through contact, so that the concentration of sulfide and methane is reduced. According to the embodiment of the invention, the control of sulfide and methane in the sewage pipeline is realized by using the in-situ urine; the strong inactivation of free ammonia to anaerobic biofilms or sediments is disclosed for the first time; the inactivation of the biological membrane of the downstream sewage pipeline can be realized without depending on the addition of chemical agents; the method has the advantages of low cost, simple operation, local material utilization, environmental friendliness and wide application prospect for sewage pipeline maintenance.

Wherein, the urine collecting tank 4 is closed. In this embodiment, a closed hydrolysis in situ urine method is used to obtain urine with high concentration of free ammonia. Specifically, the collected urine is subjected to closed hydrolysis for 3 to 7 days, the ammonia nitrogen concentration and the pH value can be improved in a short period, and a pH regulator is not required to be added additionally.

The system for treating sulfide and methane in a sewage pipeline of the embodiment further comprises a valve 5, wherein the valve 5 is arranged between the urine collecting tank 4 and the sewage pipeline 6 to be treated. In this embodiment, the open/close state of the valve 5 is used to control whether urine enters the waste pipe 6 to be treated, and the valve 5 can control the urine to intermittently enter the waste pipe 6 to be treated. For example: and opening the valve 5, controlling the urine to be continuously discharged into the sewage pipeline for 24 hours, enabling the urine to be sufficiently contacted with the biomembrane, then closing the valve 5 for a week, collecting the discharged urine in the urine collecting tank 4 and hydrolyzing, opening the valve 5 again after a week, and controlling the urine to be discharged into the sewage pipeline to be treated. Through the interval putting strategy, on the premise of ensuring the treatment effect, the sustainability is realized.

The system for treating sulfide and methane in a sewage pipeline further comprises a first concentration monitoring device and a second concentration monitoring device, wherein the first concentration monitoring device is arranged at an outlet of the urine collecting tank 4, and the second concentration monitoring device is arranged in the sewage pipeline 6 to be treated. The first concentration monitoring device in the embodiment is used for monitoring the ammonia nitrogen concentration of the hydrolyzed urine in the urine collecting tank 4, and when the ammonia nitrogen concentration of the hydrolyzed urine is 2000-6000mg N/L, the requirement is met, and the hydrolyzed urine can be thrown into the sewage pipeline 6 to be treated. The second concentration monitoring device in the embodiment is used for monitoring the ammonia nitrogen concentration and the free ammonia concentration of the diluted urine in the sewage pipeline, wherein the diluted ammonia nitrogen concentration is required to be not less than 500mg N/L, and the free ammonia concentration is required to be not less than 150mg NH 3-N/L.

The system for treating sulfide and methane in the sewage pipeline further comprises an adding device, the outlet of the urine collecting tank 4 is communicated with the sewage pipeline 6 to be treated through the adding device, and the adding device faces the position to be treated of the sewage pipeline 6 to be treated. The adding device in this embodiment may adopt a spray head or a spray gun, etc., and add the hydrolyzed urine toward the pipe section of the pipeline, which is susceptible to corrosion, to alleviate the corrosion of the pipeline.

Wherein, still include excrement and urine separator 3, the urine collecting pit 4 is buried underground in the earth's surface below, and the entry of urine collecting pit 4 passes through excrement and urine separator 3 and the sewer pipe 2 intercommunication of sanitary stool pot. The excrement-urine separator 3 in the embodiment can be a excrement-urine separating device (publication number: CN101824850A) in Chinese patent, and can also be other advanced excrement-urine separators 3 to separate excrement from urine, and only the urine is discharged into the urine collecting tank 4 to be collected and hydrolyzed.

As shown in FIG. 2, the embodiment of the invention also discloses a treatment method using the sulfide and methane treatment system of the sewage pipeline, which comprises the following steps:

s1, collecting in-situ urine;

s2, hydrolyzing the in-situ urine collected in the step S1 to increase the concentration of free ammonia in the in-situ urine;

s3, adding the urine hydrolyzed in the step S2 into a sewage pipeline, and inhibiting the activity of the biological membrane or sediment of the sewage pipeline through contact.

Wherein, in step S2:

the concentration of free ammonia in the in situ urine is increased by closed hydrolysis of the in situ urine for 3 to 7 days.

Wherein, in step S3:

the valve 5 controls the hydrolyzed urine to be added into a sewage pipeline to contact with a biological membrane or sediment for 24 hours, and the adding interval period is set to be one week

Wherein, in step S2:

the value range of the ammonia nitrogen concentration of the hydrolyzed urine is 2000-6000mg N/L;

in step S3:

adding the hydrolyzed urine into a sewage pipeline, wherein the ammonia nitrogen concentration after the urine is diluted by sewage is not less than 500mg N/L, and the free ammonia concentration is not less than 150mg NH₃-N/L。

And (3) carrying out experimental investigation on the effect of the urine with different dilution times on inactivation of the biological membrane or the sediment. As shown in FIG. 3, the percentage of viable cells in the initial biofilm to the total cells was 68. + -. 8%, and the viable cell ratio decreased to 35. + -. 3% as the FA concentration increased to 154mg NH 3-N/L. The results clearly show that: FA has strong killing effect on microorganisms on the anaerobic sewage biomembrane. Therefore, the preferred wastewater line biofilm or sediment contact concentration of this embodiment should be greater than 150mgNH3-N/L of free ammonia. Meanwhile, in order to reduce the amount of urine, the concentration of free ammonia should not be too high (e.g., not more than 200mg NH 3-N/L).

Free ammonia with a concentration of 150mg NH3-N/L was fed to a pipeline biofilm reactor for examination of its effect on reactor sulphide and methane production activity. As shown in fig. 4, the relative yields of sulfide and methane immediately dropped below 20% after dosing compared to the control reactor. The results show that: the SRB and MA activity of the anaerobic sewage biological membrane is effectively inactivated. The activity of sulphide and methane then gradually recovered, taking 6 and 28 days respectively to return to the 50% level of the control reactor, which means that the reduction of the sulphide and methane concentrations in the pipeline can be achieved by intermittent dosing of free ammonia. Therefore, the interval between the intermittent additions of urine in this example is about 1 week.

The embodiment of the invention provides a method for treating sulfide and methane in a sewage pipeline based on urine recycling, which is used for controlling the generation of sulfide and methane in the sewage pipeline. The embodiment discloses the strong inactivation effect of free ammonia on anaerobic biofilms or sediments in sewage pipelines for the first time, and provides that the free ammonia is directly collected and stored from urine, so that a low-cost sustainable feeding mode is really realized. Moreover, the method does not introduce extra nitrogen load into the environment, thereby protecting the environment. Through experimental investigation, the inactivation effect of free ammonia in urine and chemical agents on biological membranes or sediments is determined to be equivalent, and a new idea is provided for controlling the sulfide and methane in the sewage pipe network.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made by the related works, which are included in the spirit and principle of the present invention, and which include the use of the non-urine sludge hydrolysis supernatant and the like for the deodorization treatment of the sewage pipeline, are all within the scope of the present invention.