Method for reducing organic carbon in sediment of polluted water body based on voltage dynamic adjustment

Abstract

The application discloses a method for reducing organic carbon in contaminated water body sediment based on voltage dynamic adjustment, which comprises the following steps: placing a nano-diamond film electrode into a contaminated water body to be treated; under the driving of an electric field generated at a voltage of 16V-35V, free electrons are released from the surface of the nano-diamond electrode chip; the free electrons attack organic pollutants in the contaminated water body to be treated, so that organic complex components are dispersed and further degraded and converted into small molecular substances; and the voltage of the nano-diamond film electrode is dynamically adjusted according to the COD (Chemical Oxygen Demand) of the contaminated water body and the reduction effect of the sediment, so that the generated free electrons effectively act on the organic carbon in the sediment. The method can effectively reduce the organic carbon in the sediment of the contaminated water area, improve the water quality, and the adopted nano-diamond film electrode will not pollute the environment.

Description

TECHNICAL FIELD

[0001] The application relates to a method for reducing organic carbon in contaminated water body sediment, in particular to a method for reducing organic carbon in contaminated water body sediment based on dynamic voltage adjustment. BACKGROUND

[0002] In a river or lake, sediment is the main accumulation place of land-derived pollutants (such as nutrients, heavy metals, organic poisons, etc.) into the river. Under different environmental influences (such as temperature, wind and dissolved oxygen, etc.), sediment can not only purify the water body of the lake, but also become a potential endogenous pollution source to pollute the water body and increase the pollution load of the upper water body due to the rich pollutants. Sediment improvement technology is an effective means to effectively curb the release of such endogenous pollutants, and common means include: sediment dredging and in-situ remediation technology, landscape river ecological remediation type sediment dredging and treatment technology, etc.

[0003] At present, the treatment of sediment pollution has transformed from single dredging, hardening, water diversion and pollution flushing, aeration and other treatment technology research into integrated application research of multiple treatment technologies to reduce the investment, operation cost and ensure the sustained and stable treatment effect of river and lake treatment.

[0004] According to the existing engineering effect, the traditional technical method has the problems of large investment, long engineering cycle and secondary pollution, and it is urgent to develop a low-energy-consumption and high-efficiency sediment reduction technology for contaminated water body. SUMMARY

[0005] The application aims to provide a method for reducing organic carbon in contaminated water body sediment based on dynamic voltage adjustment, which solves the problems of easy secondary pollution and low efficiency of the traditional method. The method can effectively reduce the organic carbon in the sediment of the contaminated water area through dynamic voltage adjustment, improve the water quality, and the nano diamond film electrode used will not pollute the environment.

[0006] In order to achieve the above object, the application provides a method for reducing organic carbon in sediment of polluted water body based on dynamic voltage adjustment, which comprises the following steps: placing a nano-diamond thin film electrode into the polluted water body to be treated; under the driving of an electric field generated at a voltage of 16V-35V, free electrons are released from the surface of the nano-diamond electrode chip, the free electrons attack the organic pollutants in the polluted water body to be treated, the organic complex components are dispersed, and are further degraded and converted into small molecular substances; the voltage of the nano-diamond thin film electrode is dynamically adjusted according to the COD of the polluted water body and the reduction effect of the sediment, so as to realize the adjustment of the power, and make the generated free electrons effectively act on the organic carbon in the sediment; during the dynamic adjustment, when the COD of the polluted water body is higher than 8 mg / L, low voltage and low frequency are adopted to remove the pollutants, and the working voltage of the equipment is controlled between 16V and 20V; when the COD of the polluted water body is lower than 6 mg / L and the content of the organic carbon in the sediment is higher than 3%, the working voltage of the equipment is controlled between 25V and 35V, so as to realize the reduction of the organic carbon in the sediment.

[0007] Preferably, the nano-diamond thin film electrode device is composed of a nano-diamond electrode chip (substrate 1-2mm) module and a polyethylene and polypropylene framework. The diamond electrode chip is constructed by taking a metal material as a substrate to form a special thin film electrode structure, so as to realize the emission of electron groups under a low voltage and weak electric field in water. Compared with the prior art, the negative affinity potential low-energy electrons emitted by the electrode have the same principle and the same range of purification for sediment / soil or air pollution, and truly realize the full ecological restoration of a large watershed.

[0008] Preferably, the nano-structured diamond thin film electrode has a negative electron affinity film, and the surface of the electrode material has a porous structure.

[0009] The method for reducing organic carbon in sediment of polluted water body based on dynamic voltage adjustment solves the problems of secondary pollution and low efficiency caused by the traditional method, and has the following advantages:

[0010] (1) According to the reduction effect of the sediment pollutants and the water pollutants, the voltage of the equipment is dynamically adjusted, so as to realize the adjustment of the power, and the organic complex in the sediment can be more effectively dispersed. After the organic matter is dispersed, it is mineralized or oxidized into small molecular substances, which are absorbed and utilized by aquatic plants and animals and microorganisms, so as to achieve the purpose of treating and purifying the water body, removing the black and smelly sediment pollution and purifying, and finally restore the natural ecological environment of the water body and the sediment.

[0011] (2) The nano-structured diamond thin film electrode material used in the method is composed of carbon elements, and the carbon elements are the main elements in nature. The material itself does not pollute the environment.

[0012] (3) The method can realize improvement and ecological restoration of the quality of the contaminated water area sediment and water body, has simple process, low cost and high efficiency, and has prominent economic and social environmental benefits. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Figure is the reduction effect of organic carbon of the application at a voltage of 12V.

[0014] Figure 2 Figure is the reduction effect of organic carbon of the application under dynamic pressure and constant voltage. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0016] Embodiment 1

[0017] A pollution water body sediment organic carbon reduction method based on voltage dynamic adjustment is implemented according to the following steps:

[0018] The nano-diamond thin film electrode is put into the pollution water body to be treated. Under the driving of the electric field generated at 16V-35V voltage, the nano-diamond electrode chip surface releases free electrons, which attack the organic pollutants in the pollution water body to be treated, so that the organic complex components are dispersed and further degraded and converted into small molecular substances. According to the water quality and sediment reduction effect of the pollution water body, the voltage of the nano-diamond thin film electrode is dynamically adjusted, and the power is adjusted, so that the generated free electrons effectively act on the organic carbon in the sediment. During the dynamic adjustment process, when the COD of the pollution water body is higher than 8mg / L, low voltage is used for removing the pollutants, and the working voltage of the equipment is controlled between 16-20V (16V and 20V are used in this embodiment, first removing at 16V voltage, and then adjusting to 20V); when the COD of the pollution water body is lower than 6mg / L and the organic carbon content of the sediment is higher than 3%, the working voltage of the equipment is controlled between 25-35V (35V is used in this embodiment), so as to realize the reduction of the organic carbon in the sediment.

[0019] The nano-structured diamond thin film electrode has a negative electron affinity film, and the surface of the electrode material has a porous structure, and the specific surface area per square centimeter of the surface area is between 200000-300000, which is beneficial to injecting low-energy electrons into water through the surface. The nano-diamond thin film electrode equipment is composed of a nano-diamond electrode chip (substrate 1-2mm) module and a polyethylene and polypropylene framework.

[0020] like Figure 1 As shown, during the treatment of polluted water body sediment, after 21 days of treatment, the removal rate of total organic carbon in the sediment can reach 4%. During the treatment process, the sediment reduction effect gradually becomes more apparent as the treatment time increases, demonstrating the characteristics of rapid effectiveness, low cost, and excellent results.

[0021] like Figure 2 As shown, different voltage adjustments cause variations in the power of the nanostructured diamond thin-film electrode device, thereby achieving different effects. The figure reveals that under a constant voltage of 12V, the removal rate of organic carbon in the sediment is less than 4%, and even after 40 days of reaction, the removal rate remains very low. However, during dynamic voltage and frequency regulation, the removal rate of organic carbon in the sediment continuously increases, with the best effect exceeding 10%. After 6 months, the removal rate of organic carbon in the sediment can reach 60-70%, achieving effective dissociation and removal of pollutants in the sediment.

[0022] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A method for reducing organic carbon in the sediment of a contaminated water body based on voltage dynamic adjustment, characterized in that, The method comprises the following steps: The nanodiamond thin film electrode is put into the contaminated water to be treated, under the driving of the electric field generated at a voltage of 16-35 V, free electrons are released from the surface of the nanodiamond electrode chip, the free electrons attack the organic pollutants in the contaminated water to be treated, the organic complex components are dispersed, and are further degraded and converted into small molecular substances; According to the COD of the contaminated water and the total organic carbon reduction effect of the sediment, the voltage of the nanodiamond thin film electrode is dynamically adjusted, so that the generated free electrons effectively act on the organic carbon in the sediment; During the dynamic adjustment, when the COD of the contaminated water is higher than 8 mg / L, low voltage and low frequency are adopted to remove the pollutants, and the working voltage of the equipment is controlled to be between 16-20 V; when the COD of the contaminated water is lower than 6 mg / L and the organic carbon content of the sediment is higher than 3%, the working voltage of the equipment is controlled to be between 25-35 V, so as to reduce the organic carbon of the sediment.

2. The method for reducing organic carbon in the sediment of a polluted water body based on voltage dynamic regulation according to claim 1, characterized in that, The nanodiamond thin film electrode is composed of a nanodiamond electrode chip module and a polyethylene and polypropylene framework.

3. The method for reducing organic carbon in the sediment of a polluted water body based on voltage dynamic regulation according to claim 1, characterized in that, The nanodiamond thin film electrode has a negative electron affinity film, and the surface of the electrode material has a porous structure.

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