CN117185455A - Experimental device for simulate water flow dephosphorization - Google Patents

Abstract

The invention discloses an experimental device for simulating water body flowing dephosphorization, which is used for testing the performance of a non-powder formed dephosphorization material and comprises the following components: the shell is provided with a total water outlet; the containing frame is arranged in the shell and is provided with a water inlet, a feed inlet and a water outlet, the water inlet penetrates through the shell, and the non-powder formed dephosphorization material is placed in the containing frame through the feed inlet; the pump body is connected with the water inlet and is used for conveying the water body to be dephosphorized in the accommodating frame. The experimental device for simulating the flowing dephosphorization of the water body can simulate the water body circulation mode of lakes and reservoirs, and achieve the purpose of practically testing the material performance; the device is portable, and the installation is convenient, and it is convenient to remove.

Description

Experimental device for simulating water flow for phosphorus removal

Technical field

The invention relates to the technical field of resources and environment, and in particular to an experimental device for simulating phosphorus removal by water flow.

Background technique

In the existing technology, phosphorus is the main cause of eutrophication pollution in water bodies. When excess phosphorus in domestic sewage and industrial wastewater enters various types of water bodies, algae and other plankton reproduce faster and become dominant populations, occupying most of the waters. , the amount of molecular oxygen dissolved in the water body is getting less and less, making it increasingly difficult for fish and other aquatic organisms to survive, the stability of the ecosystem is broken, and the transparency, smell and taste of the water body gradually become worse, eventually leading to the black and smelly water body. produce.

In order to ensure that phosphorus emissions meet the standard, on the basis of the traditional AB method (Adsorption Biodegradation process), post-stage PAC (polyaluminum chloride) chemical phosphorus removal and BAF (biological aerated filter) are added as the main auxiliary Using methods such as polymeric ferric sulfate (PFS) chemical phosphorus removal and tail-end chemical coagulation phosphorus removal (FeCl3) technology, supplemented by filter devices, the total phosphorus value of the effluent has been greatly reduced. For example, the patent (CN202310123967.8) is a denitrification and phosphorus removal device for rainwater purification and reuse. In the device, phosphorus removal agents are used to achieve the purpose of phosphorus removal. However, as time went by, people found that although chemical phosphorus removal stabilized the phosphorus removal efficiency of the system, it introduced many other problems. Chemical phosphorus removal mainly uses chemical agents such as ferric chloride and quicklime. After being quickly dissolved in water, it can produce Fe3+, Ca2+ and other metal ions and PO43- to form phosphate insoluble matter, which must then be filtered through efficient precipitation to obtain low-phosphorus or no-phosphorus products. Phosphorus clear water. Moreover, the lower the concentration of phosphate ions in the solution, the slower the precipitation rate, and the longer the required residence time, the larger the treatment pool required, which increases a lot of construction costs.

According to the equilibrium thermodynamic analysis of chemical precipitation, precipitation can only occur when the ion product QSP is greater than the volumetric product constant KSP. When the phosphorus concentration in the sewage is low, the dosage of precipitant needs to be increased accordingly to achieve the target removal effect. After biological treatment, the phosphorus concentration in the effluent is generally less than 2 mg/L, which is at a low level. In order to achieve the conditions for the formation of phosphate precipitation, the dosage of phosphorus removal chemicals needs to be increased, and the removal efficiency will also decrease. reduced. Excessive addition of chemicals will not only increase the cost and the amount of solid waste generated, but may also be accompanied by increased requirements for phosphorus removal. It is difficult to achieve low-concentration phosphorus emission standards relying on chemical precipitation methods, and it will also affect the cations in the effluent. (Al3+, Fe3+, etc.), thereby increasing ecological and environmental risks. Therefore, in the face of increasingly stringent phosphorus removal requirements, it is of great significance to develop deep phosphorus removal technology with low ecological and environmental risks that matches the low phosphorus concentration tailwater treated by sewage plants.

The adsorption method uses porous solid materials and uses surface physical or chemical effects to attach molecules in the gas phase or liquid phase to the surface of solid materials to achieve the separation and enrichment of coexisting components. When the adsorption method is used in the field of water treatment, it is mainly used for the in-depth treatment of low-concentration pollutants, especially biodegradable substances or toxic substances. According to the principle of adsorption, adsorption phosphorus removal is to adsorb low-concentration phosphorus in the water phase onto solid materials. This process will not increase the concentration of water ions in the water phase, and can avoid metal ions in the tail water of chemical phosphorus removal (such as Al3+) concentration poses potential ecological risks due to increasingly higher requirements for phosphorus removal.

There are still very few reports on the application of adsorption technology to phosphorus removal in actual water bodies. The main reasons are: first, most research only focuses on the pursuit of adsorption capacity, and few scholars have studied the treatment effect of adsorption technology on low-concentration phosphorus ( The initial phosphorus concentration has a certain impact on the adsorption effect); secondly, in the actual dynamic phosphorus removal process, there is a prominent contradiction between the particle size of the phosphorus removal adsorption material and the phosphorus removal effect. The smaller the particle size, the greater the adsorption capacity. , the better the phosphorus removal effect. Nowadays, most of the high-efficiency phosphorus removal materials used by scholars for research are in powder form. However, the smaller the particle size, the easier it is to cause the system pressure drop to be too large, causing the filter bed to become clogged, the material to be lost more easily, and the solid-liquid separation to be more difficult to separate. Third, the evaluation of the adsorption performance of adsorbent materials remains in the beaker experiment. Most of them are only mechanical stirring and cannot simulate the water circulation mode in the actual water body. For example, in the published patent 202210348963.5, it is mentioned that the method used to test its phosphorus removal performance is: adsorption The agent materials are soaked in high-concentration nitrogen and phosphorus wastewater according to the solid-liquid mass ratio 1: (500-2000), and mechanically stirred for 12 to 36 hours. As mentioned in patent 201110132519.1, an adsorption column matching the material is used to conduct a flow adsorption experiment with a hydraulic retention time of 2 hours. However, this method only simulates wastewater passing through the adsorption column in one direction and does not have a water circulation strategy. Fourth, most evaluations and calculations of the adsorption capacity of adsorbent materials are based on the evaluation methods of conventional adsorbents such as activated carbon, which is contrary to the real adsorption method of the material, or as mentioned in the patent CN202211684834. Behavior, nonlinear fitting of the data was performed through models such as Langmuir isotherm to evaluate the maximum adsorption capacity. However, this method is still limited to standing water in a beaker or mechanical stirring, which does not conform to the actual water circulation model, so the evaluation is inaccurate. .

The patent issued on the relevant device has the following defects, which makes it unsuitable for experiments on the use of non-powder molded phosphorus removal materials in lakes and reservoirs:

1. Non-adsorption method for phosphorus removal: For example, the patented short-range nitrogen and phosphorus removal device (202223495190.8) is equipped with aerobic and anaerobic reaction modules. It is designed based on the biological nitrogen and phosphorus removal method and fails to match the actual situation. It is used in water bodies and is not suitable for adding adsorption and phosphorus removal materials. Another example is the patented domestic sewage phosphorus removal device (CN202223387325.9), which is equipped with a phosphorus removal agent spray assembly, the patented environmentally friendly river ex-situ phosphorus removal device (CN201711418603.3) and the river ex-situ phosphorus removal device. (CN201720133814.1), adding phosphorus removal powder involves chemical phosphorus removal methods and is not suitable for the use of adsorption phosphorus removal materials. In a patented in-situ ecological restoration device (CN202211160099.2) used to improve the water quality of deep-water lakes and reservoirs, the vibration of an ultrasonic algae inhibitor destroys the growth environment of algae to achieve control of algae, and at the same time, it is loaded with high-polymer slow-release particles. The device releases high-molecular organic carbon to activate the denitrification and phosphorus removal in the water body and the bacteria around the algae to improve water quality. It also uses chemical phosphorus removal and slow-release material methods for treatment. In patented a purification device for treating river sewage (CN200920200365.3) and a surface flow-vertical underflow-two-stage surface flow composite constructed wetland denitrification and phosphorus device (CN200910176534.9), the biofilm phosphorus removal method is used. There is a problem of failing to match the characteristics and application methods of adsorption and phosphorus removal materials.

2. Mismatch with the water conditions of lakes and reservoirs: In the patent for an adsorption phosphorus removal device for tail water of domestic sewage treatment plants (202222145094.4), it is mentioned that the adsorption material is a dephosphorus layer made of ceramsite, bentonite, iron It is composed of ions and magnesium ions. The material particle size is 3-5mm. The height of the dephosphorization layer 6 is 1.5m. The filler is relatively high, which requires high strength of the material. The small particle size can easily cause excessive pressure drop in the system and cause filter failure. The bed is clogged and cannot match the corresponding lake and reservoir water circulation mode, and the matched adsorption material has a narrow application range.

3. The adsorbent materials used are powder or specified shapes: a patented biofilm purification device for in-situ treatment of lakes and reservoirs (CN202221119688.1) and a patented diatomaceous earth for open water bodies such as lakes, reservoirs, and landscape waters. Although the phosphorus removal and algae control system (CN201020559019.7) is suitable for actual lake and reservoir water bodies, the former uses biofilm method for adsorption phosphorus removal, while the latter uses diatomite powder for phosphorus removal. This device cannot be used for non-powder, and Large particle size adsorption and phosphorus removal materials have limitations on their application. In the patented membrane bag type adsorption phosphorus removal device (201920655760.4), the applicable material is bag-shaped, which cannot meet the actual application of phosphorus removal materials of various shapes and characteristics.

Among many phosphorus removal materials, non-powder-formed adsorption phosphorus removal materials have received extensive attention and application research due to their advantages such as easy recycling and feeding, and low environmental impact. Relevant phosphorus removal materials also need to be matched with corresponding test devices to simulate application scenarios, so as to more accurately reflect whether the materials are suitable for actual situations. Most of the existing devices suitable for testing the related properties of phosphorus removal materials under laboratory conditions use static feeding processing, and a few add some mechanical stirring. In larger quantities of simulated pollutants, differences in effect evaluation may occur due to uneven distribution of concentrations.

Contents of the invention

According to an embodiment of the present invention, an experimental device for simulating water flow phosphorus removal is provided for testing the performance of non-powder molded phosphorus removal materials, including:

Shell, the shell is provided with a main water outlet;

The containing frame is arranged in the shell. The containing frame is provided with a water inlet, a feed port and a water outlet. The water inlet penetrates the shell, and the non-powder molded phosphorus removal material is placed in the containing frame through the feed port;

The pump body is connected to the water inlet and transports the water to be removed into the containing frame.

Furthermore, the water outlet is equipped with filter cotton.

Further, the shell includes: a movable cover, several side panels and a bottom panel;

Several side panels are connected around each other;

The bottom plate is connected with several side plates to form an accommodation cavity, and the accommodation frame is placed in the accommodation cavity;

The movable cover plate is provided on several side plates, and the water inlet penetrates the movable cover plate.

Furthermore, several side panels and the bottom panel are integrally formed.

Further, the containing frame is fixed in the housing through external bolts.

Further, it also includes: a first control valve and a second control valve; the first control valve is arranged on the water inlet, and the second control valve is arranged on the main water outlet; the first control valve and the second control valve control the flow rate of the water body.

Further, it also includes: a plurality of baffles, which are arranged in the accommodating frame at equal intervals along the extension direction of the accommodating frame. The adjacent baffles are respectively arranged on opposite sides of the accommodating frame, and a plurality of baffles are formed between the accommodating frame and the accommodating frame. Bent flow channel, bending flow channel is used for the circulation of water body.

According to the experimental device for simulating water flow and phosphorus removal according to the embodiment of the present invention, it can realize the simulated lake and reservoir water circulation mode and achieve practical testing of material properties; the device is light, convenient to install, and easy to move.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology.

Description of the drawings

Figure 1 is a schematic diagram of an experimental device for simulating phosphorus removal by water flow according to an embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to further elucidate the present invention.

First, an experimental device for simulating water flow phosphorus removal according to an embodiment of the present invention will be described with reference to FIG. 1 , which is used to test the performance of non-powder molded phosphorus removal materials and has a wide range of application scenarios.

As shown in Figure 1, the experimental device for simulating phosphorus removal by water flow according to the embodiment of the present invention includes: a shell, a containing frame 2 and a pump body (not shown in the figure).

Specifically, as shown in Figure 1, in this embodiment, the casing is provided with a main water outlet 3; the containing frame 2 is provided in the casing, which can limit the location and range of experimental materials and ensure the controllability and repeatability of the experiment. The containing frame 2 is provided with a water inlet 21, a feed port 22 and a water outlet 23. The water inlet 21 penetrates the shell, and the non-powder molded phosphorus removal material is placed in the containing frame 2 through the feed port 22; the feed port 22 is convenient for addition or replacement. The non-powder molded phosphorus removal material is used, and the water outlet 23 is used to discharge the treated water body. The pump body is connected to the water inlet 21, transports the water body to be removed phosphorus into the containing frame 2, pressurizes the water flow, transports the water body to be removed phosphorus into the containing frame 2, and ensures that the water flow enters the housing through the containing frame 2, and the pump The existence of the body allows the experiment to simulate the continuous circulation of real water bodies, thereby better evaluating the effect and performance of phosphorus removal materials. It solves the problem that under laboratory conditions, most of them are static feeding processing, and a few add some mechanical stirring, which cannot simulate real water bodies. Difficulties in water circulation patterns in lakes and reservoirs. The pump body allows water to be forced through the containing frame 2. Even if the material is insufficient and the containing frame 2 cannot be filled, complete contact between the water flow and the material can be ensured.

Further, as shown in FIG. 1 , in this embodiment, the water outlet 23 is provided with a filter cotton 231 to prevent the non-powder molded phosphorus removal material from leaking from the water outlet 23 .

Specifically, as shown in Figure 1, in this embodiment, the housing includes: a movable cover 11, a plurality of side plates 12 and a bottom plate 13; several side plates 12 are connected around each other; the bottom plate 13 is connected to several side plates 12 to form a receiving cavity , the accommodating frame 2 is placed in the accommodating cavity; the movable cover 11 is covered on a plurality of side plates 12, and the water inlet 21 penetrates the movable cover 11. The movable cover 11 can be movably connected to the side plate 12 by providing threads or hinges, etc. to ensure that the movable cover 11 can be easily opened or closed to facilitate operation, maintenance and observation of the device. By opening the cover, you can easily add or replace experimental materials, clean the containing frame 2, and perform necessary adjustments and monitoring.

Furthermore, in this embodiment, several side plates 12 and the bottom plate 13 are integrally formed, which ensures the stability of the structure, reduces assembly costs, and improves durability.

Further, as shown in Figure 1, in this embodiment, the containing frame 2 is fixed in the housing through external bolts, which can provide a more stable structure, facilitate adjustment and replacement of the containing frame 2, facilitate maintenance and cleaning, and ensure repeatability. In use, the size and material of the containing frame 2 can be selected according to the amount and nature of the material placed.

Specifically, as shown in Figure 1, in this embodiment, it also includes: a first control valve (not shown in the figure) and a second control valve (not shown in the figure); the first control valve is arranged at the water inlet 21, the second control valve is set on the main water outlet 3; the first control valve and the second control valve are convenient for controlling the water volume, water inlet speed and water outlet speed to adapt to changes in different experimental requirements.

Specifically, as shown in FIG. 1 , this embodiment also includes: a plurality of baffles 4 , which are arranged in the accommodating frame 2 at equal intervals along the extension direction of the accommodating frame 2 . The adjacent baffles 4 are respectively Arranged on opposite sides of the containing frame 2, a number of baffles 4 form curved flow channels with the containing frame 2. The curved flow channels are used for the circulation of water bodies. By bending the flow channels, the flow path of the water body is increased, and the water body is increased. The contact time and contact area with the phosphorus removal material promotes full mixing of the water body and the phosphorus removal material.

Working principle: Place the device body next to the corresponding sewage container that needs to be treated, connect the water inlet 21 and the main water outlet 3 with the sewage container, and fill the non-powder molded phosphorus removal material into the containing frame 2 through the feed port 22. , the sewage to be treated is pumped by the pump body to the water inlet 21, enters the containing frame 2, passes through the curved flow channel, and then overflows from the outlet of the filter cotton 231, enters the shell for temporary storage, and is controlled by the first control valve to control the amount and amount of water inlet. speed, the second control valve controls the water outlet volume and water outlet speed. Evaluating the adsorption capacity of non-powder molded phosphorus removal materials based on changes in phosphorus concentration in water before and after use can more accurately reflect whether the materials are suitable for actual situations and promote the use of phosphorus removal materials in actual lakes and reservoirs.

Above, the experimental device for simulating water flow and phosphorus removal according to an embodiment of the present invention is described above. It can simulate the lake and reservoir water circulation mode and achieve practical testing of material properties. The device is light, easy to install, and easy to move.

It should be noted that in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements not only includes those elements , but also includes other elements not expressly listed or inherent in such process, method, article or equipment. Without further limitation, an element defined by the statement "comprises..." does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (7)

1. An experimental device for simulating water flow dephosphorization for testing performance of non-powder formed dephosphorization material, which is characterized by comprising:

the shell is provided with a total water outlet;

the containing frame is arranged in the shell and is provided with a water inlet, a feed inlet and a water outlet, the water inlet penetrates through the shell, and the non-powder formed dephosphorization material is placed in the containing frame through the feed inlet;

the pump body is connected with the water inlet and is used for conveying the water body to be dephosphorized in the accommodating frame.

2. The experimental device for simulating the flow of water to remove phosphorus according to claim 1, wherein the water outlet is provided with filter cotton.

3. The experimental set-up for simulating the flow of a body of water for phosphorous removal of claim 1, wherein said housing comprises: the movable cover plate, a plurality of side plates and a bottom plate;

the side plates are connected with each other in a surrounding manner;

the bottom plate is connected with the side plates to form a containing cavity, and the containing frame is arranged in the containing cavity;

the movable cover plate is covered on the side plates, and the water inlet penetrates through the movable cover plate.

4. An experimental apparatus for simulating the flow of a body of water for removing phosphorus as recited in claim 3, wherein said plurality of side panels are integrally formed with said bottom panel.

5. The experimental apparatus for simulating the flow of a body of water for removing phosphorus of claim 1, wherein the containment frame is secured within the housing by external bolts.

6. The experimental apparatus for simulating the flow of a body of water for phosphorous removal of claim 1, further comprising: a first control valve and a second control valve; the first control valve is arranged on the water inlet, and the second control valve is arranged on the total water outlet; the first control valve and the second control valve control the flow rate of the body of water.

7. The experimental apparatus for simulating the flow of a body of water for phosphorous removal of claim 1, further comprising: the baffles are arranged in the accommodating frame at equal intervals along the extending direction of the accommodating frame, the adjacent baffles are respectively arranged on two opposite sides of the accommodating frame, a bending flow channel is formed between the baffles and the accommodating frame, and the bending flow channel is used for circulation of water.