Method for removing refractory organic matter in polluted bottom mud based on calcium peroxide Fenton-like enhancement technology and application

A technology for refractory organic matter and polluted sediment, applied in the field of environmental treatment, can solve the problems of low utilization rate of chemicals and high cost, and achieve the effect of broadening the scope of pH application, avoiding waste and improving stability.

Inactive Publication Date: 2020-12-22
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Application Information

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Problems solved by technology

At the same time CaO 2 -Fenton-like system can compensate for H 2 o 2 - The disadvantages of Fenton oxidation method, such as low utilization rate and high cost

Method used

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  • Method for removing refractory organic matter in polluted bottom mud based on calcium peroxide Fenton-like enhancement technology and application
  • Method for removing refractory organic matter in polluted bottom mud based on calcium peroxide Fenton-like enhancement technology and application
  • Method for removing refractory organic matter in polluted bottom mud based on calcium peroxide Fenton-like enhancement technology and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] refer to figure 1As shown, in this example, the black and odorous bottom mud of a certain tidal river in a certain city was used for the test, and the background value pollutant content of the bottom mud was: TOC=3.2%; AVS=1800mg / kg dw; ΣPAHs=14000μg / kg dw ; TPHs=300mg / kgdw. According to the background value content of sediment pollutants, according to CaO 2 The weight ratio of sediment / sediment is: 0.05:1, and the treatment agent is added by injection, and the treatment agent is CaO with a molar ratio of 6:2:1. 2 , Fe 2+ and oxalic acid (OA), pH 7, temperature 40°C. One day (24h) later, the observed sediment pollutant contents were: TOC=2.4%; AVS=15mg / kg dw; ∑PAHs=5000μg / kgdw; TPHs=203mg / kg dw. The content of TPHs and TPHs will also decrease, and the content of sediment pollutants will be significantly reduced after restoration, and there will be no phenomenon of returning to black and odor.

Embodiment 2

[0031] refer to figure 1 As shown, in this example, the polluted bottom mud of a river course in a living area of ​​a certain city is used for testing. The background value pollutant content of the bottom mud is respectively: TOC=2.7%; AVS=2400mg / kg dw; ∑PAHs=28000 μg / kg dw; TPHs = 110 mg / kg dw. According to the background value content of sediment pollutants, according to CaO 2 The weight ratio of sediment / sediment is: 0.05:1, the treatment agent is added by injection, and the treatment agent is CaO with a molar ratio of 6:2:1. 2 , Fe 2+ and oxalic acid (OA), the pH is 6-7, and the temperature is 60°C. One day (24h) later, the observed sediment pollutant content changed to: TOC=1.2%; AVS=18mg / kg dw; ∑PAHs=6700.8μg / kg dw; TPHs=56.3mg / kg dw. The content was significantly reduced, and there was no phenomenon of returning to black and odor, and the pollutants were further degraded under the action of microorganisms in the later stage.

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Abstract

The invention provides a method for removing refractory organic matter in polluted bottom mud based on a calcium peroxide Fenton-like enhancement technology and application. A Fenton-like strengthening system is formed by adding a certain proportion of Fe<2+> and a metal chelating agent oxalic acid on the basis of adding calcium peroxide, HO. and O2<->. free radicals with strong oxidizing abilityare generated, and removal of residual refractory organic matters in the bottom mud is strengthened at optimized reaction time, medicament adding proportion, pH and temperature. The method can effectively remove the refractory organic matter in the polluted bottom mud of the black and odorous riverway, has the advantages of simple actual operation, wide application range, high removal efficiency,economy, applicability and the like, and has important significance for strengthening urban black and odorous water body treatment.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and provides a method and application for removing refractory organic matter from polluted sediment based on calcium peroxide-like Fenton strengthening technology, especially involving chemical-CaO 2 Application of Fenton-like oxidation method to remove refractory organic matter from black and odorous river sediment. Background technique [0002] Sediment, as an important component of the river ecosystem, is not only the main reservoir of pollutants, but also the intermediate node of the river pollutant cycle. Its condition will directly affect the quality of the overlying water, the quality of the environment and the health of the water system. When the water area is polluted, the substances that enter the body can be attached to the sediment through physical and chemical effects such as adsorption, precipitation, and complexation. Sediment pollution. At the same time, the sed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06
CPCC02F11/06
Inventor 王宏杰董文艺王锋李文婷吴紫荆赵玥
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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