阅读说明：本技术 一种添加次氯酸钠的方法及装置 (Method and device for adding sodium hypochlorite ) 是由 苏浩 丁渊文 周泽 于 2021-07-30 设计创作，主要内容包括：本发明公开了废水处理技术领域的一种添加次氯酸钠的方法及装置,添加次氯酸钠的方法包括：采集废水处理池内废水的ORP值；当采集到的ORP值小于设定的第一阈值时,开始向废水处理池内添加次氯酸钠；当采集到的ORP值大于设定的第二阈值时,停止向废水处理池内添加次氯酸钠；能准确控制次氯酸钠的添加量,减少副产物的生成,提高了水处理的效率。(The invention discloses a method and a device for adding sodium hypochlorite in the technical field of wastewater treatment, wherein the method for adding the sodium hypochlorite comprises the following steps: collecting the ORP value of the wastewater in the wastewater treatment tank; when the collected ORP value is smaller than a set first threshold value, sodium hypochlorite is added into the wastewater treatment tank; when the collected ORP value is larger than a set second threshold value, stopping adding sodium hypochlorite into the wastewater treatment tank; the addition of sodium hypochlorite can be accurately controlled, the generation of byproducts is reduced, and the water treatment efficiency is improved.)

1. A method for adding sodium hypochlorite is characterized by comprising the following steps:

collecting the ORP value of the wastewater in the wastewater treatment tank;

when the collected ORP value is smaller than a set first threshold value, sodium hypochlorite is added into the wastewater treatment tank;

and when the collected ORP value is larger than a set second threshold value, stopping adding the sodium hypochlorite into the wastewater treatment tank.

2. The method of adding sodium hypochlorite according to claim 1, wherein the sodium hypochlorite comprises sodium hypochlorite powder and sodium hypochlorite aqueous solution.

3. The method of adding sodium hypochlorite according to claim 1, wherein the wastewater is an industrial wastewater containing ammonia nitrogen.

4. The utility model provides an add device of sodium hypochlorite, characterized by includes: the outlet of the sodium hypochlorite storage barrel is connected with the inlet of the pneumatic valve through a pipeline; the outlet of the pneumatic valve is connected with a wastewater treatment tank through a pipeline; the pneumatic valve is connected with a gas source through a gas pipeline; the gas pipeline is provided with an electromagnetic valve which is electrically connected with the ORP main controller; the ORP master controller is electrically connected with an ORP electrode, and the ORP electrode is arranged in a wastewater treatment pool.

5. The apparatus for adding sodium hypochlorite according to claim 4, wherein the pipe is made of PVC.

6. The apparatus for adding sodium hypochlorite according to claim 4, wherein a rotameter is installed on a pipe between the pneumatic valve and the wastewater treatment tank.

7. The device for adding sodium hypochlorite as recited in claim 4, wherein the ORP master controller is configured with a time relay.

8. The apparatus for adding sodium hypochlorite according to claim 4, wherein the sodium hypochlorite storage barrel is made of PE.

Technical Field

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method and a device for adding sodium hypochlorite.

Background

With the increasing wastewater discharge standard, ammonia nitrogen and total nitrogen are one of the important factors causing water eutrophication, and the requirement and the demand for removing residual ammonia nitrogen in wastewater are higher and higher. There are various methods for removing ammonia nitrogen from industrial wastewater, among which the chlorination method is often adopted because of its simplicity and feasibility; however, the inaccurate amount control in the sodium hypochlorite adding process leads to more byproducts in the reaction process, so that the waste of sodium hypochlorite and the secondary pollution of water are caused.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the method and the device for adding the sodium hypochlorite, which can accurately control the addition amount of the sodium hypochlorite, reduce the generation of byproducts and improve the efficiency of water treatment.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

in a first aspect, there is provided a method of adding sodium hypochlorite, comprising: collecting the ORP value of the wastewater in the wastewater treatment tank; when the collected ORP value is smaller than a set first threshold value, sodium hypochlorite is added into the wastewater treatment tank; and when the collected ORP value is larger than a set second threshold value, stopping adding the sodium hypochlorite into the wastewater treatment tank.

Further, the sodium hypochlorite includes sodium hypochlorite powder and sodium hypochlorite aqueous solution.

Further, the wastewater is industrial wastewater containing ammonia nitrogen.

In a second aspect, there is provided an apparatus for adding sodium hypochlorite, comprising: the outlet of the sodium hypochlorite storage barrel is connected with the inlet of the pneumatic valve through a pipeline; the outlet of the pneumatic valve is connected with a wastewater treatment tank through a pipeline; the pneumatic valve is connected with a gas source through a gas pipeline; the gas pipeline is provided with an electromagnetic valve which is electrically connected with the ORP main controller; the ORP master controller is electrically connected with an ORP electrode, and the ORP electrode is arranged in a wastewater treatment pool.

Further, the pipeline is made of PVC.

Further, a rotameter is installed on a pipeline between the pneumatic valve and the wastewater treatment tank.

Further, the ORP master is configured with a time relay.

Further, the material of the sodium hypochlorite storage barrel is PE.

Compared with the prior art, the invention has the following beneficial effects: according to the invention, whether sodium hypochlorite is added or not is judged by detecting the ORP (oxidation-reduction potential) value in the wastewater treatment tank, so that the addition amount of the sodium hypochlorite can be accurately controlled, the generation of byproducts is reduced, and the water treatment efficiency is improved; the consumption of sodium hypochlorite is reduced, and the cost is saved.

Drawings

FIG. 1 is a schematic view of a system structure of an apparatus for adding sodium hypochlorite according to an embodiment of the present invention;

FIG. 2 is a graph showing the correlation between the amount of sodium hypochlorite added and the ORP value of wastewater in a wastewater treatment tank in the example of the present invention;

FIG. 3 is a graph showing the relationship between the amount of sodium hypochlorite added and the ammonia nitrogen removal rate of wastewater in a wastewater treatment tank in the example of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The first embodiment is as follows:

the industrial wastewater containing ammonia nitrogen generated in industrial production is one of the important factors causing water eutrophication, and the ammonia nitrogen content in the industrial wastewater is reduced by adding sodium hypochlorite into the industrial wastewater containing ammonia nitrogen in production. In analyzing how to control the addition of sodium hypochlorite and reduce the generation of byproducts in the sodium hypochlorite reaction process, the change of ORP (oxidation-reduction potential) value in the reaction process is found to provide a simple and reliable basis for the control of the reaction endpoint.

The embodiment provides a method for adding sodium hypochlorite, which comprises the following steps: collecting the ORP value of the wastewater in the wastewater treatment tank; when the collected ORP value is smaller than a set first threshold value, sodium hypochlorite is added into the wastewater treatment tank; and when the collected ORP value is larger than a set second threshold value, stopping adding the sodium hypochlorite into the wastewater treatment tank.

The sodium hypochlorite includes sodium hypochlorite powder and sodium hypochlorite aqueous solution, which is used in this embodiment.

Example two:

as shown in fig. 1, based on the method for adding sodium hypochlorite according to the first embodiment, the present embodiment provides an apparatus for adding sodium hypochlorite, including: an outlet of the sodium hypochlorite storage barrel 1 is connected with an inlet of a pneumatic valve 3 through a pipeline 2; the outlet of the pneumatic valve 3 is connected with a wastewater treatment tank 8 through a pipeline; the pneumatic valve 3 is connected with a gas source through a gas pipeline 5; the gas pipeline 5 is provided with an electromagnetic valve 4, and the electromagnetic valve 4 is electrically connected with an ORP main controller 6; the ORP main controller 6 is electrically connected with an ORP electrode 7, and the ORP electrode 7 is arranged in a wastewater treatment tank 8.

In this embodiment, the pipe 2 is made of PVC and is used for conveying sodium hypochlorite into the wastewater treatment tank 8; the material that bucket 1 was stored to sodium hypochlorite is PE, volume: 10000L; the PVC pipeline and the PE sodium hypochlorite storage barrel have good sodium hypochlorite corrosion resistance, are light and are convenient to install and use; a rotameter 21 is arranged on the pipeline 2 between the pneumatic valve 3 and the wastewater treatment tank 8, the rotameter 21 is used for measuring the flow of the added sodium hypochlorite, and uploading the measured data to an ORP master controller 6 for displaying the real-time flow of the currently added sodium hypochlorite; the ORP value reflected after sodium hypochlorite addition uploads the data to the ORP master controller 6 through the ORP electrode 7.

The ORP master controller 6 is provided with a time relay 9, and the time relay 9 is used for adding sodium hypochlorite by using the time control pneumatic valve 3 when the ORP value is too low.

And the ORP electrode 7 is arranged in the wastewater treatment tank 8 and is used for collecting the ORP value of the wastewater in the wastewater treatment tank 8.

And the ORP main controller 6 is electrically connected with the ORP electrode 7 and is used for comparing the collected ORP value with a set threshold value: when the collected ORP value is smaller than a set first threshold value, outputting an opening instruction to the electromagnetic valve 4, conveying control gas output by a gas source to the pneumatic valve 3 through the gas pipeline 5, opening the pneumatic valve 3, and starting to add sodium hypochlorite into the wastewater treatment tank 8; when the collected ORP value is larger than the set second threshold value, a closing instruction is output to the electromagnetic valve 4, the electromagnetic valve 4 is closed, the pneumatic valve 3 is further closed, and sodium hypochlorite is stopped being added into the wastewater treatment tank.

The operation steps of this embodiment include:

step one, an ORP addition upper line and a lower line (the lower line is a first threshold value, and the upper line is a second threshold value) are set at an ORP master controller; the two thresholds can be obtained by comparing the correlation between ammonia nitrogen and ORP through a small experiment, as shown in fig. 2 and fig. 3, in the embodiment, when the first threshold is set to 700 and the second threshold is set to 720, a better ammonia nitrogen content removal rate can be obtained, the generation of byproducts is effectively reduced, and the water treatment efficiency is improved;

feeding the ORP numerical value in the pool back to the ORP main controller by the ORP electrode;

and step three, when the ORP value is lower than the set offline, the pneumatic valve is opened for feeding, the ORP rises in the feeding process, when the ORP reaches the online state, the pneumatic valve is closed, and the sodium hypochlorite stops feeding.

The ORP master controller is fed back to ORP numerical value in this embodiment through the ORP electrode with the pond, adds the online messenger sodium hypochlorite and adds setting up the ORP, throws through the fluctuation of ORP, is less than appointed value when the ORP value, and pneumatic valve opens and throws, and the ORP can rise throwing the in-process, and the pneumatic valve is closed when reaching the ORP online, and sodium hypochlorite stops throwing and throws. The sodium hypochlorite adding method realizes effective addition of sodium hypochlorite, and reduces the use of sodium hypochlorite on the premise of ensuring the stability of ammonia nitrogen total nitrogen, thereby reducing the generation of byproducts and reducing the impact on biological treatment. The embodiment can accurately control the addition of sodium hypochlorite, reduce the generation of byproducts and improve the efficiency of water treatment; the consumption of sodium hypochlorite is reduced, and the cost is saved.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.