Reactor for removing arsenic by biomineralization of water body
By using an iron-oxidizing bacteria biomineralization reactor, which utilizes spray aeration and manganese sand filter media to accelerate Fe²+ oxidation, the problem of arsenic removal in reducing high-arsenic water bodies has been solved, achieving efficient and low-cost arsenic removal, and is suitable for different water quality conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-03-06
AI Technical Summary
Existing technologies are inefficient at removing arsenic, especially trivalent arsenic (As(III),) from groundwater with high arsenic content. Furthermore, adsorption methods suffer from adsorbent saturation and high operating costs. Additionally, the natural oxidation process of Fe²⁺ is slow, and the resulting iron flocs are difficult to settle.
The biomineralization reactor based on iron-oxidizing bacteria includes a spray aeration water distribution module and a biomineralization module. It uses manganese sand filter media as a carrier, increases dissolved oxygen concentration through spray aeration, accelerates Fe²+ oxidation, forms a biofilm to remove arsenic, and is equipped with an Fe²+ replenishment module and a backwashing module to adapt to different water quality conditions and maintain equipment stability.
It achieves efficient removal of arsenic from groundwater without the addition of external oxidants, with the effluent quality meeting national drinking water standards. The equipment is simple, low-cost, easy to maintain, widely applicable, and has no adsorption saturation problem.
Smart Images
Figure CN223973946U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of arsenic-containing water treatment technology, specifically relating to a reactor for biological mineralization removal of arsenic from water. Background Technology
[0002] Groundwater is a vital global source of drinking water. However, arsenic contamination in groundwater has become an increasingly serious global environmental problem. According to my country's latest drinking water standards (GB 5749-2022), the maximum permissible concentration of arsenic in drinking water is 10 μg / L. Excessive arsenic levels not only trigger a series of acute and chronic poisoning symptoms but also pose a long-term threat to human health. Therefore, effective measures must be taken to remove arsenic contamination from water. In particular, in reducing, high-arsenic groundwater, arsenic mainly exists in the form of trivalent arsenic (As(III)). Because trivalent arsenic is highly toxic and difficult to remove, developing technologies for deep arsenic removal from water bodies has become an urgent issue to be addressed.
[0003] Adsorption is currently the most widely used technology for arsenic removal from groundwater, but it suffers from problems such as adsorbent saturation, adsorbent regeneration, and high operating costs, making it difficult to use on a large scale in rural and urban areas. High-arsenic groundwater with reducing properties is often accompanied by a certain concentration of Fe. 2+ This is because the arsenic primarily originates from the dissolution of iron-manganese oxides that hold arsenic under reducing conditions. Therefore, utilizing the primary Fe²⁺ in groundwater... + The technology of removing arsenic through oxidation and precipitation has attracted widespread attention, and it does not suffer from the problem of adsorption saturation. For example, a typical flocculation-precipitation process involves oxidizing Fe²⁺. + Ferric hydroxide flocs are formed, removing arsenic from the water. However, due to Fe²⁺… + The natural oxidation process is relatively slow, and the resulting iron flocs are difficult to settle effectively.
[0004] In recent years, biomineralization processes mediated by iron-oxidizing bacteria have provided a new approach to solving this problem. Iron-oxidizing bacteria can form biofilms on the surface of filter media, promoting Fe²⁺ production. + Arsenic is rapidly oxidized and precipitated on the surface of the filter media, thereby effectively removing arsenic from groundwater.
[0005] Therefore, developing an integrated bioreactor based on iron-oxidizing bacteria biomineralization for treating high-arsenic groundwater has significant application prospects and important practical value for the efficient treatment of reducing high-arsenic groundwater. Summary of the Invention
[0006] 1. Purpose of the invention
[0007] The purpose of this invention is to provide a reactor for arsenic removal through biomineralization in water bodies. This reactor is based on Fe... 2+Oxidizing bacterial biomineralization, including a spray aeration water distribution module and a biomineralization module, utilizes functional microorganisms to attach to the filter media and form a biofilm, accelerating the reduction of Fe in the water. 2+ The oxidation precipitation process achieves efficient arsenic removal.
[0008] 2. Technical Solution
[0009] To solve the above problems, the technical solution adopted by this utility model is as follows:
[0010] This invention provides a reactor for arsenic removal through biomineralization in water bodies. The reactor includes a spray aeration and water distribution module and a biomineralization module, wherein:
[0011] The spray aeration and water distribution module includes spray heads, which are located at the top of the biomineralization module and connected to the inlet pipe. The dissolved oxygen (DO) concentration in the water is significantly increased after spray aeration by the module, which is beneficial for accelerating the growth of microorganisms on the filter media and for iron-oxidizing bacteria to oxidize Fe. 2+ The process provides electron acceptors;
[0012] The biomineralization module, from top to bottom, includes: a filter media layer, a support layer, a perforated baffle, a water collection area, and a first outlet located on one side of the water collection area; the filter media layer is beneficial for the presence of Fe... 2+ Oxidative microorganisms attach to its surface and then remove arsenic from the water through biomineralization; the perforated baffle and water collection area can achieve uniform water distribution and reduce the impact on the biofilm on the filter media during reactor backwashing.
[0013] Furthermore, the filter media in the aforementioned filter layer is manganese sand filter media; the manganese sand filter media serves as a biological carrier, transferring functional Fe... 2+ Oxidizing microorganisms attach to the filter media surface. Manganese sand filter media has good hydrophilicity, which is conducive to the attachment of microorganisms, and also has good Fe content. 2+ Adsorption properties are beneficial to functional Fe 2+ Growth of oxidizing microorganisms.
[0014] Furthermore, the particle size range of the above-mentioned manganese sand filter media is 1~5 mm, and the filling thickness is 40~60 cm.
[0015] Furthermore, the particle size range of the aforementioned manganese sand filter media is 1~2 mm.
[0016] Furthermore, the thickness of the manganese sand filter media particles is 50 cm.
[0017] Furthermore, the filler in the aforementioned support layer is any one or more of the following: pebbles, quartz sand, gravel, etc.
[0018] Furthermore, the particle size range of the filler in the aforementioned support layer is 0.5~1.5 cm.
[0019] Furthermore, the aforementioned reactor for arsenic removal through biomineralization in water also includes Fe... 2+ Supplementary module, this Fe 2+ The supplementary modules include: Fe 2+ The concentrate storage tank is connected to the inlet pipe at the first connection point, which in turn connects to the spray head pipe; when Fe in the groundwater... 2+ Fe is enabled when / As is low. 2+ Supplement the system, supplement Fe 2+ Used for biomineralization, enabling the reactor to meet the requirements of groundwater arsenic pollution treatment under different water quality conditions.
[0020] Furthermore, when Fe in the water 2+ When / As (mass ratio) is greater than or equal to 150, Fe does not need to be enabled. 2+ The supplementary module can remove arsenic to meet the standards; when Fe in groundwater 2+ When / As is less than 150, Fe is enabled. 2+ Supplementary module supplements Fe 2+ .
[0021] Furthermore, the above-mentioned Fe 2+ The concentrate includes a ferrous sulfate solution.
[0022] Furthermore, the above-mentioned Fe 2+ The supplementary module also includes: a pipe mixer, positioned between the spray head and the first connection point, to mix the inlet water with Fe... 2+ The concentrate is thoroughly mixed.
[0023] Furthermore, the aforementioned reactor for arsenic removal through biomineralization in water also includes a backwashing module. The backwashing module comprises a backwashing inlet and a backwashing outlet. The backwashing inlet is located on one side of the water collection area, and the backwashing outlet is located on the upper part of one side of the biomineralization module, between the spray head and the filter media layer.
[0024] Furthermore, the aforementioned backwashing module also includes a backwashing water tank, which is connected to the backwashing inlet pipe.
[0025] Furthermore, the aforementioned backwashing module is activated every 3 to 5 days to remove free iron oxide particles from the device, ensuring effective contact time between the water and the biofilm on the filter media surface, as well as long-term operation of the reactor.
[0026] Furthermore, the aforementioned reactor for biological mineralization and arsenic removal in water also includes an inlet tank, which is connected to a spray aeration water distribution module pipeline and can be used to temporarily store water to be treated.
[0027] This invention also provides the application of the above-mentioned reactor for the removal of arsenic from water through biomineralization.
[0028] Furthermore, the aforementioned water bodies include groundwater.
[0029] Furthermore, the above applications include:
[0030] Based on Fe in water 2+ / As determines whether Fe is enabled 2+ Supplementary module, when Fe in the water body 2+ When / As is greater than or equal to 150, Fe does not need to be enabled. 2+ Supplementary module; Fe in groundwater 2+ When / As is less than 150, Fe is enabled. 2+ Supplementary module supplements Fe 2+ ;
[0031] Supplemented or not supplemented with Fe 2+ The water enters the biomineralization module after passing through the spray aeration and water distribution module; the treatment by the spray aeration and water distribution module increases the concentration of DO in the influent, which is beneficial for accelerating the growth of microorganisms on the filter media and for iron oxidizing bacteria to oxidize Fe. 2+ The process provides electron acceptors;
[0032] The water passes through a filter layer and undergoes biological mineralization to remove arsenic before being discharged from the first outlet at 250°C; the Fe in the water... 2+ and filter media layer filter media surface Fe 2+ Oxidizing bacteria biofilm undergoes a biomineralization reaction, removing arsenic from the water.
[0033] Furthermore, the above applications also include backwashing using a backwashing module. Backwash water enters the biomineralization module through the backwash inlet 410 and is discharged through the backwash outlet 420. When a large amount of free iron oxides accumulates in the filter media layer, the backwashing system needs to be activated to ensure the contact time between the filter media and the water and the long-term stable operation of the reactor. The perforated baffle 230 and the water collection area 240 can achieve uniform water distribution and reduce the impact on the biofilm on the filter media during reactor backwashing.
[0034] Furthermore, the activation cycle of the aforementioned backwashing module is 3 to 5 days, and its activation can also be determined based on the degree of clogging of the filter layer by free iron oxides in the reactor.
[0035] Furthermore, the above applications also include regular inspections and maintenance, including regular inspections and maintenance of the system's pumps, pipelines, and other equipment to ensure their normal operation.
[0036] 3. Beneficial effects
[0037] Compared with the prior art, the advantages of this utility model are as follows:
[0038] (1) The present invention provides a reactor for arsenic removal through biomineralization in water, comprising a spray aeration water distribution module and a biomineralization module, wherein the arsenic is removed through Fe... 2+ Oxidizing bacteria attach to filter media (such as manganese sand) and utilize the Fe naturally present in the water. 2+ Biomineralization can effectively reduce arsenic levels in water to below my country's drinking water standards. This process requires no external oxidant and does not suffer from adsorption saturation, allowing for long-term stable arsenic removal.
[0039] (2) The reactor for arsenic removal by biological mineralization in water provided by this utility model further includes Fe at the inlet end. 2+ Supplementary module, when native Fe in the water body 2+ When the concentration is low, Fe can be supplemented. 2+ To ensure effective arsenic removal, it is applicable to arsenic-containing water bodies with different water quality conditions, ensuring that the arsenic in the effluent meets my country's drinking water hygiene standards (GB 5749-2022).
[0040] (3) The present invention provides a reactor for arsenic removal through biological mineralization in water, Fe 2+ Most of the iron oxides produced by oxidation are deposited on the surface of the filter media. A small amount of free iron oxides are physically intercepted when passing through the filter media layer, thus not affecting the turbidity of the effluent. At the same time, the reactor is equipped with a backwashing module, which can effectively remove the intercepted free iron oxides and ensure the stable and efficient operation of the reactor.
[0041] (4) The present invention provides a reactor for the biological mineralization and arsenic removal of water bodies. The equipment is simple to operate, has high processing efficiency, small footprint, low operating cost, energy saving and environmental protection, easy maintenance, flexible adjustment and wide applicability. Moreover, the effluent water quality meets the national drinking water quality standards and has broad application prospects. Attached Figure Description
[0042] Figure 1 This is a schematic diagram of a reactor used for biomineralization and arsenic removal in water.
[0043] In the picture:
[0044] 110-Sprayer head;
[0045] 210 - Filter media layer; 220 - Support layer; 230 - Perforated baffle; 240 - Water collection area; 250 - First outlet;
[0046] 310-Fe 2+ Concentrate storage tank; 320-pipeline mixer;
[0047] 410 - Backwash inlet; 420 - Backwash outlet; 430 - Backwash tank;
[0048] 510 - Water inlet tank. Detailed Implementation
[0049] The present invention will be further described below with reference to specific embodiments.
[0050] It should be noted that terms such as "upper", "lower", "left", "right", and "middle" used in this specification are only for clarity of description and are not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.
[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.
[0052] Unless otherwise specified in the examples, the procedures should be performed under standard conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products.
[0053] As used herein, the term “about” is used to provide for the flexibility and imprecision associated with a given term, measure, or value. Those skilled in the art can readily determine the degree of flexibility for a particular variable.
[0054] As used herein, the term “at least one of…” is intended to be synonymous with “one or more of…”. For example, “at least one of A, B, and C” explicitly includes only A, only B, only C, and combinations thereof.
[0055] Concentration, amount, and other numerical data may be presented in range format herein. It should be understood that such range format is used solely for convenience and brevity and should be flexibly interpreted to include not only the values explicitly stated as the limits of the range, but also all individual values or subranges encompassed within the range, as if each value and subrange were explicitly stated. For example, a range of values from about 1 to about 4.5 should be interpreted to include not only the explicitly stated limits of 1 to 4.5, but also individual numbers (such as 2, 3, 4) and subranges (such as 1 to 3, 2 to 4, etc.). The same principle applies to ranges that describe only a single value, such as "less than about 4.5," which should be interpreted to include all the values and ranges described above. Furthermore, this interpretation should apply regardless of the breadth of the range or characteristic described.
[0056] For example, the reactor used in this paper for the biomineralization and arsenic removal of water bodies has its parameters such as size, capacity, water flow rate and residence time optimized according to the treatment requirements and scale of the water body to be treated (such as groundwater).
[0057] The spray aeration and water distribution module or spray head used in this article can change the DO concentration by adjusting its height to meet the oxidation-reduction requirements of microbial strains and maintain the best treatment effect in the reactor.
[0058] As illustrated in this paper, the application of a reactor for arsenic removal through biomineralization in water bodies allows for adjustments to the water flow rate and the contact time between the water and the filter media based on the influent water quality, ensuring sufficient reaction time for the biomineralization process.
[0059] Example 1
[0060] This embodiment provides a reactor for arsenic removal through biomineralization in water bodies.
[0061] like Figure 1 As shown, the reactor includes a spray aeration and water distribution module and a biomineralization module, wherein:
[0062] The spray aeration and water distribution module includes a spray head 110, which is located at the top of the biomineralization module and connected to the inlet pipe. The dissolved oxygen (DO) concentration in the water is significantly increased after spray aeration by the spray aeration and water distribution module, which is beneficial for accelerating the growth of microorganisms on the filter media and for iron-oxidizing bacteria to oxidize Fe. 2+ The process provides electron acceptors;
[0063] The biomineralization module, from top to bottom, includes: a filter media layer 210, a support layer 220, a perforated partition 230, a water collection area 240, and a first outlet 250 located on one side of the water collection area 240; the filter media layer 210 is beneficial for the presence of Fe 2+ Oxidative microorganisms attach to its surface and then remove arsenic from the water through biomineralization. The perforated baffle 230 and the water collection area 240 can achieve uniform water distribution and reduce the impact on the biofilm on the filter media during reactor backwashing.
[0064] In one embodiment, the filter media in the filter layer 210 is manganese sand; the manganese sand serves as a biological carrier, transferring functional Fe... 2+ Oxidizing microorganisms attach to the filter media surface. Manganese sand filter media has good hydrophilicity, which is conducive to the attachment of microorganisms, and also has good Fe content. 2+ Adsorption properties are beneficial to functional Fe 2+ Growth of oxidizing microorganisms.
[0065] In one embodiment, the manganese sand filter media has a particle size range of 1 to 2 mm and a filling thickness of 50 cm.
[0066] In one embodiment, the filler in the support layer 220 is pebbles, quartz sand and gravel, and the particle size range of the filler in the support layer is 0.5~1.5 cm.
[0067] In one embodiment, an inlet tank 510 is also included, which is connected to the spray head 110 via a pipe and can be used to temporarily store water to be treated.
[0068] Example 2
[0069] This embodiment provides a reactor for arsenic removal through biomineralization in water bodies.
[0070] like Figure 1 As shown, the reactor includes a spray aeration and water distribution module, a biomineralization module, and an Fe module. 2+ Supplementary modules, including:
[0071] The spray aeration and water distribution module includes a spray head 110, which is located at the top of the biomineralization module and connected to the inlet pipe.
[0072] The biomineralization module includes, from top to bottom: a filter layer 210, a support layer 220, a perforated partition 230, a water collection area 240, and a first outlet 250 located on one side of the water collection area 240.
[0073] Fe 2+ The supplementary modules include: Fe 2+ The concentrate storage tank 310 is connected to the inlet pipe at the first connection point, and the first connection point is connected to the spray head 110; when Fe in the groundwater 2+ Fe is enabled when / As is low. 2+ Supplement the system, supplement Fe 2+ Used for biomineralization, enabling the reactor to treat groundwater arsenic contamination under varying water quality conditions. In application, when Fe in the water... 2+ When / As (mass ratio) is greater than or equal to 150, Fe does not need to be enabled. 2+ The supplementary module can remove arsenic to meet the standards; when Fe in groundwater 2+ When / As is less than 150, Fe is enabled. 2+ Supplementary module supplements Fe 2+ .
[0074] In one implementation, Fe 2+ The concentrate includes a ferrous sulfate solution.
[0075] In one implementation, Fe 2+ The supplementary module also includes: a pipe mixer 320, located between the spray head 110 and the first connection point, for mixing the inlet water with Fe. 2+ The concentrate is thoroughly mixed.
[0076] Example 3
[0077] This embodiment provides a reactor for arsenic removal through biomineralization in water bodies.
[0078] like Figure 1 As shown, the reactor includes a spray aeration and water distribution module, a biomineralization module, and an Fe... 2+ The supplementary module and the backwashing module, wherein:
[0079] The spray aeration and water distribution module includes a spray head 110, which is located at the top of the biomineralization module and connected to the inlet pipe.
[0080] The biomineralization module includes, from top to bottom: a filter layer 210, a support layer 220, a perforated partition 230, a water collection area 240, and a first outlet 250 located on one side of the water collection area 240.
[0081] Fe 2+ The supplementary modules include: Fe 2+ The concentrate storage tank 310 is connected to the water inlet pipe at the first connection point, and the first connection point is connected to the spray head 110.
[0082] The backwashing module includes a backwash inlet 410 and a backwash outlet 420. The backwash inlet 410 is located on one side of the water collection area 240, and the backwash outlet 420 is located on the upper part of one side of the biomineralization module, between the spray head 110 and the filter media layer 210. During reactor backwashing, the perforated baffle 230 and the water collection area 240 can achieve uniform water distribution and reduce the impact on the biofilm on the filter media. In application, the backwashing module is activated every 3-5 days. Activation can also be determined based on the degree of clogging of the filter layer by free iron oxides in the reactor, in order to remove free iron oxide particles from the device, ensuring effective contact time between the water and the biofilm on the filter media surface, and long-term operation of the reactor.
[0083] In one embodiment, the backwash module further includes a backwash water tank 430, which is pipe-connected to the backwash inlet 410.
[0084] In this embodiment, the reactor used for arsenic removal through biomineralization in water is applied by first determining the Fe content in the water... 2+ / As determines whether Fe is enabled 2+ Supplementary module, when Fe in the water body 2+ When / As is greater than or equal to 150, Fe does not need to be enabled. 2+ Supplementary module; Fe in groundwater 2+ When / As is less than 150, Fe is enabled. 2+ Supplementary module supplements Fe 2+ Secondly, whether or not Fe was supplemented.2+ The water enters the biomineralization module after passing through the spray aeration and water distribution module; then, the water passes through the filter layer 210, undergoes biomineralization to remove arsenic, and is discharged from the first outlet 250. The Fe in the water... 2+ And filter media layer 210 filter media surface Fe 2+ The oxidizing bacteria biofilm undergoes a biomineralization reaction to remove arsenic from the water. Finally, backwashing is performed using a backwashing module. The backwash water enters the biomineralization module through the backwash inlet 410 and is discharged through the backwash outlet 420. The backwashing module is activated every 3 to 5 days. The backwashing system can also be activated when a large amount of free iron oxides accumulate in the filter media layer 210.
Claims
1. A reactor for biological mineralization of arsenic removal from water bodies, characterized in that, The reactor comprises a spray aeration water distribution module and a biomineralization module, wherein: The spray aeration water distribution module is arranged at the top of the biomineralization module and connected with the water inlet pipeline; The biomineralization module comprises, from top to bottom, a filter material layer, a supporting layer, a perforated partition, a water collecting area and a first water outlet arranged at one side of the water collecting area.
2. The reactor for biological mineralization of arsenic removal from water bodies according to claim 1, characterized in that, The filter material in the filter material layer is manganese sand filter material.
3. The reactor for biological mineralization of arsenic removal from water bodies according to claim 2, characterized in that, The reactor further comprises a backwashing module, which comprises a backwashing water inlet and a backwashing water outlet, the backwashing water inlet is arranged at one side of the water collecting area, and the backwashing water outlet is arranged at the upper part of one side of the biomineralization module between the spray head and the filter material layer.
4. The reactor for biological mineralization of arsenic removal from water bodies according to claim 3, characterized in that, The reactor also comprises Fe 2+ The supplementary module comprises Fe 2+ The supplementary module comprises Fe 2+ The concentrated liquid storage tank is connected with the water inlet pipeline at a first connection point, and the first connection point is connected with the spray head pipeline.
5. The reactor for biological mineralization of arsenic removal from water bodies according to claim 4, characterized in that, The manganese sand filter material has a particle size range of 1-5 mm and a filling thickness of 40-60 cm.
6. The reactor for biological mineralization of arsenic removal from water bodies according to claim 5, characterized by the fact that, The filler in the supporting layer is any one of rain flower stone, quartz sand and gravel, and the particle size range of the filler is 0.5-1.5 cm.
7. The reactor for biological arsenic removal by mineralization in water bodies according to any one of claims 4-6, characterized in that, The Fe 2+ The supplementary module further comprises a pipe mixer arranged between the spray head and the first connection point.
8. The reactor for biological mineralization of arsenic removal from water bodies according to claim 7, characterized by the fact that, The Fe 2+ The concentrated solution comprises a ferrous sulfate solution.
9. The reactor for biological arsenic removal by mineralization in water bodies according to claim 8, characterized in that, The spray aeration water distribution module comprises a spray head.
10. The reactor for biological mineralization of arsenic removal from water bodies according to claim 9, characterized in that, The backwashing module further comprises a backwashing water tank connected with the backwashing water inlet pipeline.