Method for remedying tidal flat plants and recycling organic pollutions

A technology of organic pollution and phytoremediation, applied in the restoration of polluted soil, water pollutants, land preparation methods, etc., can solve the problem of difficult plant treatment, underutilization, no harmless recycling of papermaking wastewater, soil improvement, etc. problem, to achieve the effect of promoting plant growth

Inactive Publication Date: 2020-08-28
YANCHENG INST OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Technical problem to be solved: This application mainly proposes a method for recycling organic pollution by phytoremediation of tidal flats, and solves the problem that many coastal wetland resources in the prior art are still growing and rotting naturally, and have not been fully utilized. Most of the artificial wetlands Plants are not recycled in situ, pollutants in wetland soil, such as the accumulation of persistent organic matter discharged from paper mills, polluted plants are difficult to treat, and the nearby papermaking wastewater has not been completely harmless and recycled. Treatment and soil improvement, currently Technical issues such as in situ collection of reed plants for production of biochar and methods for treatment and recycling of wastewater and contaminated soil have not yet been adopted

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  • Method for remedying tidal flat plants and recycling organic pollutions
  • Method for remedying tidal flat plants and recycling organic pollutions
  • Method for remedying tidal flat plants and recycling organic pollutions

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A method for phytoremediation and recycling of organic pollution in tidal flats, such as figure 1 As shown, including the following steps:

[0042] The first step: From 2001 to 2013, the papermaking wastewater from the papermaking wastewater treatment plant was used to irrigate the saline-alkali soils in the wetland with the papermaking wastewater. For 13 years, the refractory pollutants in the papermaking wastewater were left in the soil and were not discharged into the irrigated wetland; One or more of Spartina or Suaeda;

[0043] The second step: Collect the tidal flat plants growing in the contaminated soil of the first step, air-dry until the moisture content is less than 20%, and crush them into powder with a particle size of 0.125-0.250 mm;

[0044] The third step: 60-80% of the tidal flat plants in the second step are used for papermaking, and 20-40% is put into the papermaking wastewater to absorb the pollutants in the papermaking wastewater, kept at 21-29℃ for 2 hour...

Embodiment 2

[0051] Such as figure 2 As shown, the powder of reed A and Spartina alterniflora B adsorbed different concentrations of organic pollution in the solution, such as the removal rate graph of 2,4,6-trichlorophenol.

[0052] The highest percentage of 2,4,6-trichlorophenol (2,4,6-TCP) removed by reed and Alternanthera powder in an aqueous solution at 45°C is 80.1% and 71.6%, respectively; at 25°C, reed powder has a low concentration 10 mg L -1 To high concentration 160 mg L -1 , The removal rate dropped from 75.4% to 30.7%, at 35°C, the removal rate dropped from 78.5% to 32.4%, and at 45°C, 80.1% dropped to 34.7%; while the removal rate of Spartina alterniflora powder was At 25°C, it dropped from 60.3% to 23.9%, at 35°C, it dropped from 66.6% to 28.2%, and at 45°C, it dropped from 71.6% to 32.7%.

Embodiment 3

[0054] Such as image 3 Shown are the changes in soil physical and chemical properties such as SOC, CEC, N, P, and K content changes after the application of biomass charcoal.

[0055] Compared with the control, after the application of biomass charcoal, the soil organic carbon content significantly increased by 64%-243.4% (2014.11), 47.9%-194.5% (2015.5), 122.8%-218.8% (2015.11), 151.8%-218.5% (2016.5), 107.6%-260.9% (2016.11) ( image 3 a). With the increase in the amount of biomass charcoal, the content of organic carbon has also increased significantly and remains stable. This is mainly because the carbon element in biomass charcoal is stable and not easily degraded.

[0056] Soil cation exchange capacity (CEC) also increased significantly with the increase in the amount of biomass charcoal application, which is due to the increase in the number of functional groups in the soil by the application of biomass charcoal ( image 3 b). With the increase in the amount of biomass cha...

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Abstract

The invention discloses a method for remedying tidal flat plants and recycling organic pollutions. Beach plants are used to adsorb and absorb organic pollutants in wetland, then most of the plants arecrushed for papermaking, part of the plants are used to adsorb organic pollutants in wastewater of a paper mill, and then the beach plants and sludge are separated from water and air-dried. The driedtidal flat plant and sludge mixture is pyrolyzed to obtain combustible gas, pyroligneous liquor and biomass charcoal. The sludge of the paper mill is dried by using the combustible gas. The pyroligneous liquor flows back to a sewage treatment plant. Part of the biomass charcoal is used for improving contaminated soil and saline-alkali soil, and the other part of biomass charcoal can be used for adsorbing wastewater pollutants. The disclosed method is a comprehensive technical method for providing wetland plant growth, plant comprehensive utilization, wastewater treatment and soil improvementagents. The above improvement agents are environmentally friendly and can be recycled.

Description

Technical field [0001] The invention belongs to the technical field of waste recycling and utilization, and in particular relates to a method for phytoremediation and recycling of organic pollution in tidal flats. Background technique [0002] Coastal wetland plants, such as reeds, Spartina alterniflora, and Suaeda salsa, play an important role in the protection and improvement of saline-alkali soils. The wetland system is one of the most productive ecosystems on the planet, with important ecological, hydrological and environmental functions. Reed is a particularly promising energy plant and chemical raw material. It becomes dry under natural conditions at the end of autumn and winter, which greatly reduces the cost of the drying process. Therefore, harvesting wetland plants such as reeds will not harm the ecosystem. Later it also promotes the growth of reeds and other plants in the following year. [0003] Wetland sediments are important pollution sinks and play an important ro...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F1/28C10B53/02C10B53/00C10B57/10B09C1/10A01B79/02C01B32/324
CPCA01B79/02B09C1/105C02F1/286C02F3/32C02F2101/36C02F2103/28C10B53/00C10B53/02C10B57/10C01B32/324Y02E50/10
Inventor 崔立强严金龙丁成陈天明
Owner YANCHENG INST OF TECH
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