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Method and system for enhancing constructed wetland to remove microcystis and toxins in water

A technology of microcystin and artificial wetlands, which is applied in chemical instruments and methods, water pollutants, biological water/sewage treatment, etc., can solve the problem of unsatisfactory removal of extracellular toxins, toxic and harmful by-products, and increased extracellular toxins and other problems, to achieve the effect of reducing the water body residence time, good removal effect, and efficient treatment

Pending Publication Date: 2018-01-09
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the physical methods remove intracellular toxins (IMC) by removing Microcystis cells, but the removal effect on extracellular toxins (EMC) in water is not ideal, and it is easy to rupture algae cells and increase the number of cells in water. exotoxin
Chemical methods mainly destroy the structure of MCs through oxidation, and most of them have a good treatment effect on intracellular and extracellular toxins, but the extensive use of chemical agents is likely to produce toxic and harmful by-products, causing secondary pollution, and the treatment cost Extremely high, difficult to apply on a large scale
[0004] At present, there are no related technical reports on the application of constructed wetland treatment technology to the removal of Microcystis and toxins in water

Method used

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  • Method and system for enhancing constructed wetland to remove microcystis and toxins in water
  • Method and system for enhancing constructed wetland to remove microcystis and toxins in water
  • Method and system for enhancing constructed wetland to remove microcystis and toxins in water

Examples

Experimental program
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Effect test

Embodiment 1

[0051] This example provides a method for strengthening constructed wetlands to remove microcystins and toxins from water bodies, which uses the combined action of exogenous microcystin-degrading bacteria and indigenous microorganisms in constructed wetland biofilms to improve the removal efficiency of constructed wetlands for algae and their toxins ; The method of using exogenous microcystin-degrading bacteria is to enrich and increase the concentration of microcystins from the water body of the outbreak of Microcystis blooms, and regularly detect the gene mlrA of the degrading bacteria during the enrichment process to confirm that the degrading bacteria culture time, until the concentration of microcystin-degrading bacteria in the microcystin-degrading bacteria solution is 1×10 6 ~2×10 6 cell / m 2 After the above, the bacterial solution is applied to the constructed wetland.

[0052] The constructed wetland adopts subsurface flow constructed wetland, and the wetland matrix ...

Embodiment 2

[0082] Embodiment 2 The present invention is to the removal effect test of nutrient salts such as nitrogen and phosphorus

[0083] Construct and utilize the subsurface flow constructed wetland system and method described in Example 1, use a 10 L PVC plastic barrel to construct a constructed wetland with an effective volume of 2.5 L, and fill the substrate with 5 cm soil layer and 15 cm gravel ( The gravel was washed with tap water before filling, and the bottom layer was filled with 5 cm large-grained zeolite (20 mm) to prevent the water outlet from being clogged, and 3 yellow calamus plants were evenly planted in each device.

[0084] Device operation: After the device is completed, eutrophic lake water is used for irrigation and cultivation for one year, and nutrients are artificially added. The concentrations of nutrients such as nitrogen and phosphorus in the influent are shown in Table 2:

[0085] Table 2 Influent Water Quality

[0086]

[0087] Nitrogen and phosphorus ...

Embodiment 3

[0088] Example 3: Removal test of algae cells and soluble microcystin LR by enhanced constructed wetlands

[0089] Construct and utilize the subsurface flow constructed wetland system and method described in Example 1, evenly invert the degrading bacteria composite bacteria solution on the surface soil of the wetland, mix the composite bacteria solution and the soil matrix evenly by plowing, and domesticate for a week. The initial microcystin MC-LR concentrations were set at 3.61 μg / L, 6.80 μg / L, and 16.07 μg / L, respectively. After one-time water intake, stay in the wetland for 7 days, and collect 1mL water samples at 0h, 6h, 12h, 24h, 48h, 72h, 96h, 120h, 144h, and 168h for the determination of EMC-LR.

[0090] The optimal hydraulic retention time of the wetland system is 3 days. Under this hydraulic retention time, the removal rate of the constructed wetland system for toxin-producing algal cells (endotoxin IMC-LR) is 73.5%-95.4%, and for Microcystis extracellularis The rem...

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Abstract

The invention discloses a method and system for enhancing a constructed wetland to remove microcystis and toxins in water. By adding exogenous degrading bacteria liquid, the synergistic physical, chemical and biological effects achieved by a matrix in the wetland system are enhanced, and innocent treatment on microcystis and toxins is further performed. According to the method and system disclosedby the invention, the efficiency of treating microcystis toxins in sewage by the constructed wetland system can be enhanced, drainage is accelerated to reach the national sanitary standard for domestic drinking water, the total nitrogen removal efficiency reaches 67.5%or higher, the ammoniacal nitrogen removal efficiency reaches 52.6% or higher, the nitrate nitrogen removal efficiency reaches 91.6% or higher, the total phosphorus removal efficiency reaches 76.0% or higher, toxic microcystis removal efficiency reaches 95.4%, and the microcystis toxin removal efficiency reaches 98.4%. Accordingto the method, the purification effect of the constructed wetland system on the sewage is enhanced, secondary pollution is avoided, the construction and operation cost can be effectively reduced, thewater treatment effect is stable, and the system can adapt to impact on different microcystis toxin polluted loads.

Description

technical field [0001] The invention relates to the technical field of water treatment, and more specifically, relates to a treatment method for strengthening artificial wetlands to remove toxin-producing algae and microcystins from water bodies, which is suitable as a drinking water source or as an efficient and effective treatment method for microcystins and toxins in eutrophic water bodies. Easy handling. Background technique [0002] The problem of toxic cyanobacterial blooms caused by eutrophication and climate change has become increasingly prominent. Toxic cyanobacterial blooms not only seriously damage the water ecosystem, but also release algal toxins that threaten the health of aquatic animals, plants and humans. Microcystins (Microcystins, referred to as MCs) are the most common and most harmful cyanotoxins. Microcystins are generally produced and exist in algal cells, but under certain conditions, algal cells will rupture and intracellular cyanotoxins (IMCs) will...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F101/16C02F101/10
CPCC02F3/34Y02W10/10
Inventor 邰义萍万翔杨扬满滢王瑞王佳希杨瑜芬段杰瀚
Owner JINAN UNIVERSITY
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