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Method and device for reducing endogenous nitrogen in eutrophic water body by utilizing submerged plant to couple sediment microbial fuel cell

A technology for eutrophic water and submerged plants, applied in the field of ecological restoration, can solve problems such as high nitrogen and phosphorus concentrations, difficulties, and large water level waves, and achieve the effects of promoting denitrification and denitrification, strengthening nitrogen reduction, and promoting absorption

Pending Publication Date: 2018-10-26
INST OF AQUATIC LIFE ACAD SINICA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the early stage of recovery, submerged plants face some stress habitat obstacles such as too deep water level, too strong wind and waves, substrate anaerobic, too high concentration of nitrogen and phosphorus, too hard substrate, too low transparency of water body, competition of planktonic algae, etc., resulting in submerged plants. It is difficult for water plants to colonize and survive. It is necessary to seek other technical methods to improve or create a habitat suitable for submerged plants to restore

Method used

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  • Method and device for reducing endogenous nitrogen in eutrophic water body by utilizing submerged plant to couple sediment microbial fuel cell
  • Method and device for reducing endogenous nitrogen in eutrophic water body by utilizing submerged plant to couple sediment microbial fuel cell
  • Method and device for reducing endogenous nitrogen in eutrophic water body by utilizing submerged plant to couple sediment microbial fuel cell

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Effect test

Embodiment 1

[0046] A method for reducing nitrogen in eutrophic water by coupling submerged plants with microbial fuel cells, the steps of which are as follows:

[0047] A. Plant submerged plants in the bottom mud layer of eutrophic water bodies; use the roots of submerged plants to release oxygen to form an aerobic-anoxic-anaerobic microenvironment around the rhizosphere, which is conducive to the occurrence of nitrification and denitrification processes, and at the same time The organic matter secreted by the roots of aquatic plants can be used as a carbon source for denitrification to make up for the lack of carbon source in the denitrification process that cannot proceed smoothly.

[0048] B, bury the anode plate at 3cm-10cm below the bottom mud layer-water interface, near the root system of submerged plants (5 or 7 or 8 or 10cm in diameter around the root); It is released into the overlying water layer, and the root system length of submerged plants is generally 3-10cm. The anode plat...

Embodiment 2

[0060] A device that uses microbial fuel cells coupled with submerged plants to reduce nitrogen in eutrophic water. The device is laid with a bottom mud layer 1, an anode plate 2, submerged plants 3, an overlying water layer 4, and a cathode plate from bottom to top. 5. Outer wire 6, outer resistor 7. It is characterized in that: the anode plate 2 is located 3 or 5 or 8 or 10 cm below the surface of the bottom mud 1, the roots of the submerged plants 3 pass through the openings of the anode plate 2 and penetrate into the bottom mud 1, and the cathode plate 5 is suspended on the top. In the water-covered layer 4, 30%-50% (all within this range) area is exposed to the air, one end of the outer lead 6 is connected to the anode plate 2, and the other end of the outer lead 6 is respectively connected to the external resistance 7 and the cathode plate 5 connected.

[0061] The thickness of the bottom mud layer 1 is 10 or 15 or 22 or 27 or 30 cm, which is the bottom mud in eutrophic...

Embodiment 3

[0075] The experiment compared the effect of M-SMFC system and SMFC system on nitrogen reduction in sediment and overlying water under the same environmental conditions. The results showed that:

[0076] 1) The M-SMFC group achieved the strongest endogenous ON mineralization, making the TN content in both sediment and overlying water smaller. The electricity generation process of the SMFC group promoted the conversion of organic nitrogen in the sediment to ammonia nitrogen, and the conversion of ammonia nitrogen to nitrate nitrogen, and the accumulation of nitrate in the sediment and the reduction of ammonia nitrogen. In the M-SMFC group, in addition to absorbing the sediment and overlying water, the submerged plants enriched the ammonia nitrogen in the body (see Table 4, the nitrogen content in the C. galerica was 32.2% higher), and further promoted nitrification by releasing oxygen through plant photosynthesis effect.

[0077] 2) SMFC promotes the removal of endogenous TN, ...

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Abstract

The invention discloses a method and a device for reducing endogenous nitrogen in an eutrophic water body by utilizing submerged plants to couple sediment a sediment microbial fuel cell. The method comprises the following steps: A, planting the submerged plants in sediment of the eutrophic water body; B, embedding a positive plate under a bottom mud layer-water interface and near root systems of the submerged plants; C, setting a negative plate on a water-air interface, enabling a positive material to suspend in water and the negative plate to be partially exposed in the air; D, connecting thepositive plate with the negative plate by using a guide lines and an external resistor, thus forming a current loop. The submerged plants are rooted in bottom mud, holes in the middle part of the positive plate penetrate through the submerged plants and are located at the lower part of a mud-water interface, an upper water covering layer is located on the mud-water interface, the negative plate is suspended on an upper water covering layer-air interface, one end of an external guide wire is connected with the positive plate, and the other end is respectively connected with the external resistor and the negative plate. The method disclosed by the invention is simple, the operation is convenient, and the structure is simple; the endogenous nitrogen is changed into gaseous nitrogen through adenitrificaiton process and is removed out of the water body, and the concentration of nitrogen nutrient in the bottom mud is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration of polluted water bodies such as lakes, rivers, ditches, etc., and more specifically relates to a method for reducing source nitrogen in eutrophic water, and also relates to a method for reducing eutrophication by coupling microbial fuel cells with submerged plants It is a device for nitrogen source in water, which is used for nitrogen removal in eutrophic water body, especially water body with high content of endogenous nitrogen. Background technique [0002] Water eutrophication is a major water environment problem that the world is facing at present and for a considerable period of time in the future. As nutrients necessary for the growth of phytoplankton, the accumulation of nitrogen and phosphorus is an important cause of eutrophication in water bodies. With the implementation of exogenous control measures such as sewage interception and drainage, the release of nitrogen and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/32C02F3/00C02F3/34C02F101/16
CPCC02F3/005C02F3/301C02F3/32C02F3/325C02F3/34C02F2101/16C02F2103/007
Inventor 肖恩荣吴振斌许鹏龙忆年武俊梅鲁汭徐栋周巧红贺锋
Owner INST OF AQUATIC LIFE ACAD SINICA
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