Calcium ion reinforced iron electrochemical water pollution treatment method and application

Abstract

The invention discloses a calcium ion reinforced iron electrochemical water pollution treatment method and application, and relates to the technical field of water treatment. The water body containing phosphorus and organic matters is subjected to electrochemical electrolysis by adopting a calcium ion reinforced iron electrochemical treatment method, the phosphorus and the organic matters in the polluted water body can be efficiently and quickly removed, meanwhile, the use amount of chemical flocculants in the existing process is greatly reduced, the hydraulic retention time is short, the pH fluctuation change is small, and efficient water purification can be realized. The treatment process is simple and efficient, can meet the water body remediation requirements of the karst region where the terrain is steep and structures cannot be built in a large-scale centralized mode, and has very good prospects and value.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a calcium ion-enhanced iron electrochemical water pollution treatment method and application. Background Art

[0002] As an essential element for organisms, phosphorus has an important impact on the aquatic environment. Compared with other essential nutrients, phosphorus has a low relative abundance and is very precious for life activities. With the increase of the world's population, the balance of phosphorus has changed seriously. On the one hand, soil erosion and the uncontrolled application of phosphorus fertilizers have led to excessive phosphorus content in surface waters, causing environmental and ecological problems. For example, the manufacture of phosphorus fertilizers discharges about 2 million tons of phosphogypsum waste each year, resulting in serious water and soil pollution during storage, which may lead to eutrophication of freshwater bodies and harmful algal blooms. The depletion of dissolved oxygen in lakes and the mass death of aquatic organisms pose an increasing threat to human health and aquatic life. On the other hand, areas with scarce phosphorus fertilizer resources face serious survival problems, such as food production cannot meet social life, and recovering phosphorus from water bodies has become a major goal.

[0003] Water bodies and sediments contain a large amount of organic matter, forming one of the most important carbon sink systems on Earth. It plays an important role in regulating the transfer of matter and energy between water, land and atmosphere. After migration and microbial degradation, organic matter can be converted into carbon dioxide and transmitted to the atmosphere, which may aggravate the greenhouse effect and pose a huge threat to global warming. In order to save energy and reduce emissions, it is very important to control organic carbon in water bodies. In addition, organic carbon in water bodies may eventually affect drinking water and human health. For example, it affects the efficiency of pre-treatment processes such as coagulation and filtration in urban drinking water treatment, and organic matter may form potential toxic substances such as chlorinated alkanes during the disinfection of drinking water. Long-term exposure to organic water bodies may cause unknown diseases. Therefore, the situation where carbon and phosphorus co-pollution poses a health threat to aquatic organisms and humans urgently needs to be effectively dealt with.

[0004] There are two common methods for water remediation: 1) biological and 2) physicochemical. The biological method uses polyphosphate accumulating organisms (PAO) in activated sludge to remove phosphorus from the solution under alternating anaerobic and aerobic conditions. Low cost and good performance have led to widespread application in municipal wastewater treatment. However, for karst areas with broken surfaces and steep slopes, traditional centralized municipal sewage treatment structures are difficult to build, and the method of adding chemical agents for flocculation and precipitation remediation is inefficient. Affected by the complex components of the environment, the amount of agents used is large and the cost is expensive. Coagulant is a commonly used low-cost water treatment process, which is often used for the treatment of phosphorus-containing organic wastewater. Adding iron or aluminum salts to sewage can generate iron / aluminum oxide / (hydroxide) adsorbents, thereby effectively removing phosphorus and organic matter. However, chemical flocculation requires the consumption of a large amount of chemicals, such as the need to adjust the pH value before and after treatment to ensure removal efficiency. In addition, chemical coagulation cannot be accurately operated, resulting in excessive secondary pollution or incomplete treatment due to insufficient agents.

[0005] Therefore, it is necessary to provide a system and method that is easy to operate and suitable for water purification in karst areas, thereby effectively reducing water pollution caused by phosphorus and organic matter. Summary of the invention

[0006] The purpose of the present invention is to provide a calcium ion enhanced iron electrochemical water pollution treatment method and application to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] One of the technical solutions of the present invention is to provide a calcium ion enhanced iron electrochemical treatment method for removing phosphorus and organic matter in water, comprising the following steps:

[0009] Adding a salt containing calcium ions to a water body containing phosphorus and organic matter, performing electrochemical electrolysis, stirring for a certain hydraulic retention time, and then removing the precipitate obtained after the electrochemical electrolysis, thereby achieving the removal of phosphorus and organic matter in the water body;

[0010] The electrode material used in the electrochemical electrolysis contains iron.

[0011] More preferably, the cathode of the electrochemical electrolysis is a conductive material such as titanium, iron, stainless steel, graphite plate, etc., and the anode is an iron material with an iron content greater than 90%.

[0012] The second technical solution of the present invention is to provide another calcium ion enhanced iron electrochemical treatment method for removing phosphorus and organic matter from water, the electrochemical treatment method comprising the following steps:

[0013] Electrochemically electrolyzing water containing phosphorus and organic matter, stirring it for a certain hydraulic retention time, and then removing the precipitate obtained after the electrochemical electrolysis to achieve the removal of phosphorus and organic matter in the water;

[0014] The water contains calcium ions;

[0015] The electrode material used in the electrochemical electrolysis contains iron.

[0016] More preferably, the cathode of the electrochemical electrolysis is a conductive material such as titanium, iron, stainless steel, graphite plate, etc., and the anode is an iron material with an iron content greater than 90%.

[0017] Furthermore, the added calcium salt is calcium chloride; the calcium salt is added according to the concentration of phosphorus in the water body, and 0.05-0.1 g / L of calcium salt is added for every 1 mg / L of phosphorus.

[0018] Furthermore, the current density of the electrochemical electrolysis is 25-50 mA / cm 2 , the electrolysis time is 2-5min.

[0019] Furthermore, the water body is a calcium-containing water body in a karst area.

[0020] The third technical solution of the present invention is to provide a calcium ion enhanced iron electrochemical treatment system, including: an anode, a cathode and an electrochemical reaction cell.

[0021] At least one of the anode and the cathode contains iron.

[0022] More preferably, the cathode of the electrochemical electrolysis is a conductive material such as titanium, iron, stainless steel, graphite plate, etc., and the anode is an iron material with an iron content greater than 90%.

[0023] Technical solution four of the present invention: provides the application of the above-mentioned calcium ion enhanced iron electrochemical treatment system in removing phosphorus and organic matter in water bodies.

[0024] Furthermore, the water body is a calcium-containing water body in a karst area.

[0025] Furthermore, the application includes the following steps: adding the water body to the electrochemical reaction cell for electrochemical electrolysis to achieve the removal of phosphorus and organic matter in the water body.

[0026] The electrochemical treatment system of the present invention mainly includes: a hydraulic lifting device, a dosing pump, a power supply system, an anode circuit, a cathode circuit, an anode, a cathode, an electrochemical reaction cell, a stirring device, a sedimentation tank, an overflow port, a sludge pump, a sludge pipe, etc.

[0027] The electrochemical reaction cell is provided with an electrolytic reaction system and a reagent adding system. The power supply system supplies direct current to the anode and cathode through the anode circuit and the cathode circuit.

[0028] The bottoms of the electrochemical reaction tank and the sedimentation tank are connected to sludge pipes;

[0029] The electrochemical reaction tank and the sedimentation tank pump the sediment into the sludge pipeline through a sludge pump, which is preferably a submersible pump;

[0030] Preferably, the electrochemical reaction cell is fed with raw water via a hydraulic lifting device, preferably a submersible pump;

[0031] Preferably, the reagent of the reagent adding system of the electrochemical reaction cell is added via a dosing pump;

[0032] Preferably, the agent added by the dosing pump is calcium chloride;

[0033] Preferably, the electrochemical reaction cell is provided with a stirring device;

[0034] Preferably, the sedimentation tank is provided with an overflow port for outflowing clean water;

[0035] Preferably, the distance between the electrodes is 3-5 cm.

[0036] Preferably, the electrochemical treatment method of the present invention comprises the following steps:

[0037] (1) The water pumped in by the hydraulic lifting device and the reagent added by the dosing pump are mixed evenly and then enter the electrochemical reaction cell to perform an electrolytic reaction. After the electrolytic reaction, stirring is continued for a certain hydraulic retention time. After the reaction, the sediment in the electrochemical reaction cell is pumped into the sludge pipe by the sludge pump, and the reagent is preferably calcium chloride;

[0038] (2) The treated sewage enters the sedimentation tank for precipitation reaction. The sludge and other sediments produced by the electrochemical reaction tank and the sedimentation tank are pumped into the sludge pipe through the sludge pump;

[0039] (3) The supernatant in the sedimentation tank is discharged through the overflow port and released after passing the inspection.

[0040] Preferably, the amount of reagent added is calculated according to the phosphorus concentration of the influent. 0.05-0.1 g / L of reagent is added for every mg / L of phosphorus concentration of the influent. The electrolytic reaction current of the electrochemical reaction cell is 25-50 mA / cm 2 , the electrolysis reaction time is 2-5min, and the hydraulic retention time is 30-40min.

[0041] Preferably, the precipitation reaction time of the precipitation tank is 1.5-3 hours.

[0042] In the electrochemical sedimentation tank, the calcium and iron electrochemical systems jointly produce flocs to absorb and capture P and organic matter, forming sludge precipitation, intercepting P and organic matter pollution. The present invention can control eutrophication, toxic organic matter, reduce carbon emissions and ultimately achieve water pollution remediation.

[0043] Principle of the present invention:

[0044] The electrolytic anode of the present invention dissolves and releases iron ions, and further generates various iron oxide nanoparticles. Phosphorus and organic carbon in the water body are adsorbed by the iron oxides, and are precipitated together and removed from the water body. The added calcium chloride agent can neutralize the potential repulsion, provide more adsorption sites, and overcome the interference of complex organic matter to further enhance the electrochemical interception capacity. Iron flocs and calcium ions synergistically absorb and capture P and organic matter to form sludge precipitation, quickly control eutrophication, reduce toxic organic matter, reduce carbon emissions and ultimately achieve water pollution remediation.

[0045] The chemical reactions involved are as follows:

[0046] Anode: Fe 0 -2e - →Fe 2+

[0047] Cathode: 2H + +2e - →H2

[0048] Iron Oxide Nanoparticles Generation:

[0049] 4Fe 2+ +O2+4H + →4Fe 3+ +2H2O

[0050] Fe 3+ +3H2O→Fe(OH)3+3H +

[0051] Iron oxides and calcium jointly adsorb phosphorus and organic matter:

[0052] Fe(OH)3+Ca 2+ +DOM→Fe(OH)3CaDOM

[0053]

[0054] FePO4+Fe(OH)3CaDOM→coprecipitate.

[0055] The present invention discloses the following technical effects:

[0056] The present invention can achieve efficient and rapid removal of phosphorus and organic matter in polluted water, while greatly saving the amount of chemical flocculants used in the existing process, with a short hydraulic retention time and small pH fluctuation, thus achieving efficient water purification.

[0057] The treatment method of the present invention is simple and easy to operate, and is particularly suitable for the restoration of water bodies such as lakes, rivers, and reservoirs in karst areas where P and organic matter pollution is serious, the terrain is steep and large-scale centralized construction of structures is impossible, and the calcium content is high.

[0058] The treatment process of the present invention is simple and efficient, stable in operation, easy to maintain, has the characteristics of being precisely adjustable, having a short hydraulic retention time, and being able to efficiently intercept P and organic pollution, and has very good prospects and value. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0060] Figure 1 The figure shows the removal of organic matter in the polluted water body after electrolysis for 2 minutes and hydraulic retention time of 30 minutes at different calcium chloride concentrations in Example 1.

[0061] Figure 2 The figure shows the removal of phosphorus in the polluted water after electrolysis for 2 minutes and hydraulic retention time of 30 minutes at different calcium chloride concentrations in Example 1.

[0062] Figure 3 The removal of organic matter in the polluted water body is shown in the experimental group of Example 2 after 30 minutes of hydraulic retention (marked as electrochemistry), the blank control group 1 after 30 minutes of hydraulic retention (marked as FeSO4), and the blank control group 2 after 30 minutes of hydraulic retention (marked as Fe2(SO4)3).

[0063] Figure 4 The removal of phosphorus in the polluted water body is shown in the experimental group of Example 2 after 30 minutes of hydraulic retention after 2 minutes of electrolysis reaction (marked as electrochemistry), the blank control group 1 after 30 minutes of hydraulic retention (marked as FeSO4), and the blank control group 2 after 30 minutes of hydraulic retention (marked as Fe2(SO4)3).

[0064] Figure 5 The total iron content in the polluted water body is shown in the experimental group of Example 2 after 2 minutes of electrolysis reaction and 30 minutes of hydraulic retention (marked as electrochemistry), the blank control group 1 after 30 minutes of hydraulic retention (marked as FeSO4), and the blank control group 2 after 30 minutes of hydraulic retention (marked as Fe2(SO4)3).

[0065] Figure 6The pH changes over time in the experimental group of Example 2 after 2 minutes of hydrodynamic retention (labeled as electrochemistry), the blank control group 1 after 30 minutes of hydrodynamic retention (labeled as FeSO4), and the blank control group 2 after 30 minutes of hydrodynamic retention (labeled as Fe2(SO4)3).

[0066] Figure 7 It is a schematic diagram of the structure of the calcium ion enhanced iron electrochemical system; wherein, 1-submersible pump, 2-dosing pump, 3-photovoltaic power supply system, 4-anode circuit, 5-cathode circuit, 6-anode, 7-cathode, 8-electrochemical reaction cell, 9-stirring device, 10-sedimentation tank, 11-overflow port, 12-sludge pump. DETAILED DESCRIPTION

[0067] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0068] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0069] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0070] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0071] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0072] Example 1

[0073] The batch sequence experiment was used to treat the simulated polluted water. The steps are as follows:

[0074] The simulated polluted water (P = 1mg / L, C = 20mg / L, pH = 8) prepared in the laboratory was added to three beakers, 0.5L in each beaker, and then calcium chloride was added to the three beakers, so that the concentrations of calcium chloride after dissolution were 0mg / L, 55mg / L, and 270mg / L, respectively. After stirring evenly, an electrochemical electrolysis reaction was carried out, with the Ti plate as the cathode and the iron plate as the anode. The electrode size was 10mm×80mm, and the electrode spacing was 30mm. The electrochemical electrolysis reaction time was 2min. After the electrolysis reaction was completed, stirring was maintained and the reaction was stopped for 30min (hydraulic retention time). After that, the precipitation was removed by filtration through a 0.45 micron membrane to complete the purification of the simulated polluted wastewater.

[0075] Figure 1 The figure shows the removal of organic matter in polluted water after 2 minutes of electrolysis and 30 minutes of hydraulic retention time at different calcium chloride concentrations.

[0076] Figure 2 The figure shows the removal of phosphorus from polluted water after 2 minutes of electrolysis and 30 minutes of hydraulic retention time at different calcium chloride concentrations.

[0077] Depend on Figure 1 and Figure 2 It can be seen that as the concentration of calcium chloride increases, the residual rate of organic matter decreases from 97% to 0.39%, and the residual rate of phosphorus decreases from 98% to 0%.

[0078] Example 2

[0079] The experimental group treated polluted water from lakes and reservoirs in real karst areas through batch sequential experiments. The steps are as follows:

[0080] First, 0.5L of real karst lake and reservoir polluted water (P = 0.89mg / L, C = 25.48mg / L, Ca = 100.86mg / L, pH = 8.05) was added to a beaker. After stirring evenly, an electrochemical electrolysis reaction was carried out, with an iron plate as the cathode and an iron plate as the anode. The electrode size was 10mm×80mm, the electrode spacing was 30mm, and the current density was 25mA / cm 2 The electrochemical electrolysis reaction time is 2 minutes. After the electrolysis reaction is completed, stirring is maintained for 30 minutes (hydraulic retention time), and then the precipitate is removed by filtration through a 0.45 micron membrane to complete the purification of the polluted water.

[0081] Blank control group 1: No electrolysis was performed, and ferrous sulfate was directly added to the polluted water for chemical flocculation, so that the total iron concentration after dissolution was 19 mg / L, which was equivalent to the total iron production of the electrochemical system in the experimental group.

[0082] Blank control group 2: No electrolysis was performed, and ferric sulfate was directly added to the polluted water for chemical flocculation, so that the total iron concentration after dissolution was 19 mg / L, which was equivalent to the total iron production of the electrochemical system in the experimental group.

[0083] This embodiment performs electrolytic purification on polluted water in karst areas without adding any reagents, and uses calcium ions in the water to strengthen the electrochemical electrolysis process. The calcium and iron electrochemical systems jointly produce flocs to absorb and capture P and organic matter, forming sludge precipitation, and intercepting P and organic matter pollution.

[0084] Figure 3 The removal of organic matter in the polluted water body is shown in the experimental group after 2 minutes of electrolysis reaction and 30 minutes of hydraulic retention (marked as electrochemistry), the blank control group 1 after 30 minutes of hydraulic retention (marked as FeSO4), and the blank control group 2 after 30 minutes of hydraulic retention (marked as Fe2(SO4)3).

[0085] Figure 4 The removal of phosphorus in polluted water bodies is shown in the experimental group after 30 minutes of hydraulic retention (marked as electrochemical) after 2 minutes of electrolysis reaction, the blank control group 1 after 30 minutes of hydraulic retention (marked as FeSO4), and the blank control group 2 after 30 minutes of hydraulic retention (marked as Fe2(SO4)3).

[0086] Figure 5 The total iron content in the polluted water body is shown in the experimental group after 2 minutes of electrolysis reaction and 30 minutes of hydraulic retention (marked as electrochemistry), the blank control group 1 after 30 minutes of hydraulic retention (marked as FeSO4), and the blank control group 2 after 30 minutes of hydraulic retention (marked as Fe2(SO4)3).

[0087] Figure 6 The pH changes over time in the experimental group after 2 minutes of hydrodynamic retention (labeled as electrochemistry), the blank control group 1 after 30 minutes of hydrodynamic retention (labeled as FeSO4), and the blank control group 2 after 30 minutes of hydrodynamic retention (labeled as Fe2(SO4)3).

[0088] Figure 3 and Figure 4 The results showed that the removal rate of P and C in the experimental group in Example 2 reached 99%, while in the blank control groups 1 and 2, the removal rates of C and P by the ferrous sulfate flocculant were only 91% and 75%, and the removal rates of C and P by the ferric sulfate flocculant were only 66% and 46%.

[0089] Depend on Figure 5 It can be seen that the total iron concentration in the experimental group and the blank control group in Example 2 is the same.

[0090] Depend on Figure 6 It can be seen that the removal rate is related to pH. During the reaction, the pH of the blank group is lower due to the hydrolysis reaction, which is not conducive to the formation of precipitation.

[0091] Example 3

[0092] The schematic diagram of the structure of the calcium ion enhanced iron electrochemical system used is as follows Figure 7 As shown, 1-submersible pump, 2-dosing pump, 3-photovoltaic power supply system, 4-anode line, 5-cathode line, 6-anode, 7-cathode, 8-electrochemical reaction cell, 9-stirring device, 10-sedimentation tank, 11-overflow port, 12-sludge pump.

[0093] The method for repairing polluted water bodies in lakes and reservoirs in karst areas by a calcium ion-enhanced iron electrochemical system is as follows:

[0094] First, the polluted water from the real karst lakes and reservoirs (P=9.89mg / L, C=15.85mg / L, Ca=200.86mg / L, pH=8.01) is pumped into the electrochemical reaction cell 8 through the submersible pump 1. Calcium chloride agent is added through the dosing pump 2, and the amount of agent added is calculated according to the influent phosphorus concentration. Add 0.1g / L agent for every mg / L of influent phosphorus concentration. This embodiment adds 1g / L agent. After stirring evenly, an electrochemical electrolysis reaction is carried out, with a stainless steel plate as the cathode and a carbon steel plate as the anode. The electrode size is 10mm×80mm, and the electrode spacing is 30mm. The current density of the electrochemical electrolysis reaction is 25mA / cm 2 , time is 2min, stirring is maintained after the electrolysis reaction is completed, and the hydraulic retention time is maintained for 30min.

[0095] The water after electrochemical electrolysis treatment enters the sedimentation tank 10 and undergoes a sedimentation reaction for 3 hours. The supernatant is discharged through the overflow port 11 and discharged after passing the test. The calcium and iron electrochemical system of the present invention jointly produces flocs to absorb and capture P and organic matter, forming sludge precipitation, intercepting P and organic pollution.

[0096] In this embodiment, the photovoltaic power supply system 3 supplies direct current to the anode 6 and the cathode 7 via the anode line 4 and the cathode line 5 .

[0097] In this embodiment, the stainless steel plate is the cathode 7, the carbon steel plate is the anode 6, the electrode size is 10mm×80mm, and the electrode plate spacing is fixed at 30mm. The flocculated precipitate in the electrochemical reaction tank 8 is pumped into the sludge pipe by the sludge pump 12 and discharged for subsequent centralized treatment.

[0098] The sludge and other sediments in the sedimentation tank are pumped into the sludge pipe by the sludge pump 12 and discharged for further treatment. The sludge of the entire treatment system can be pumped by a sanitation sludge pumping vehicle and directly used as greening and agricultural basal fertilizer rich in phosphorus organic matter nearby.

[0099] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A calcium ion enhanced iron electrochemical treatment method for removing phosphorus and organic matter from water, characterized in that: The following steps are involved: Adding calcium salt to a water body containing phosphorus and organic matter, performing electrochemical electrolysis, stirring, and then removing the precipitate obtained after the electrochemical electrolysis to achieve the removal of phosphorus and organic matter in the water body; The electrode material used in the electrochemical electrolysis contains iron.

2. A calcium ion enhanced iron electrochemical treatment method for removing phosphorus and organic matter from water, characterized in that: The electrochemical treatment method comprises the following steps: Electrochemically electrolyzing the water containing phosphorus and organic matter, stirring it, and removing the precipitate obtained after the electrochemical electrolysis, thereby achieving the removal of phosphorus and organic matter in the water; The water contains calcium ions; the electrode material used in the electrochemical electrolysis contains iron elements.

3. The calcium ion enhanced iron electrochemical treatment method according to claim 1, characterized in that: The calcium salt is calcium chloride; the calcium salt is added according to the concentration of phosphorus in the water body, and 0.05-0.1 g / L of calcium salt is added for every 1 mg / L of phosphorus.

4. The calcium ion enhanced iron electrochemical treatment method according to claim 1 or 2, characterized in that: The current density of the electrochemical electrolysis is 25-50 mA / cm 2 , the electrolysis time is 2-5min.

5. The calcium ion enhanced iron electrochemical treatment method according to claim 2, characterized in that: The water body is a calcium-containing water body in a karst area.

6. A calcium ion enhanced iron electrochemical treatment system, characterized in that: include: Anode, cathode and electrochemical reaction cell; At least one of the anode and the cathode contains iron.

7. Use of the calcium ion enhanced iron electrochemical treatment system as claimed in claim 6 in removing phosphorus and organic matter from water.

8. The use according to claim 7, characterized in that: The water body is a calcium-containing water body in a karst area.

9. The use according to claim 8, characterized in that: The following steps are involved: The water body is added into the electrochemical reaction cell for electrochemical electrolysis to achieve the removal of phosphorus and organic matter in the water body.

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