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Method for preparing permeable reactive barrier for relieving passivation of zero-valent iron

A technology of permeable reactive walls and zero-valent iron, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of low efficiency and easy passivation of permeable reactive walls, and achieve The effects of avoiding microbial loss, alleviating passivation, and mild reaction conditions

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of low efficiency of the permeable reaction wall caused by easy passivation during the application of zero-valent iron

Method used

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  • Method for preparing permeable reactive barrier for relieving passivation of zero-valent iron
  • Method for preparing permeable reactive barrier for relieving passivation of zero-valent iron
  • Method for preparing permeable reactive barrier for relieving passivation of zero-valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Preparation of double-layer permeable reactive wall 13 fillers:

[0025] CaO 2 The granules and Woshibao granules are evenly mixed at a volume ratio of 3:2, and packed into the first layer to form the oxygen-releasing nutrient layer 131 .

[0026] Cut the corn stalks to 1-3cm with a cutting machine, burn them under anoxic conditions at 300°C for 2 hours, soak them in 1mol / L hydrochloric acid for 12 hours, wash them with deionized water to remove the ash, wash them until the pH value is constant, and dry them in an oven at 105°C. Grind, pass through a 40-mesh sieve, and pass through a 60-mesh sieve for the undersieve, and the oversieve is biochar.

[0027] Prepare 10L of sterile suspension activation medium, inoculate L.acidophilus, and culture with shaking for 24 hours. Concentrate to 1L by aseptic centrifugation (bacteria concentration 10 8 ). After 12 hours, configure 1 L of sterile suspension activation medium, inoculate L.acidophilus, and culture w...

Embodiment 2

[0031] Example 2: The prepared permeable reaction wall 13 repairs Cr-polluted groundwater.

[0032] my country is the largest producer of chromium salts in the world, and chromium and its compounds are widely used in metallurgical industry, electroplating industry, leather making, printing and dyeing and other industries. In recent years, the disorderly accumulation of chromium slag has seriously polluted soil and groundwater, posing a great threat to animals, plants and human health. Due to the close combination of chromium and soil minerals, the harmless treatment of chromium is difficult. Therefore, how to effectively control and control the chromium pollution in soil and groundwater is a very important and urgent task. The toxicity of Cr(VI) is extremely strong. In contrast, Cr(III) is less toxic and less harmful to the environment. Therefore, converting Cr(VI) into Cr(III) is an important way to reduce the harm of Cr pollution. How to effectively reduce Cr(VI) to Cr(III...

Embodiment 3

[0035] Example 3: The prepared permeable reaction wall 13 treats chlorophenol pollutants.

[0036] Chlorophenol pollutants are bioaccumulative, refractory to biodegradation, and have "three causes" effects, so they are a class of pollutants that are prioritized for control. Aiming at the treatment of chlorophenol pollutants in water bodies, a lot of research work has been carried out in related fields at home and abroad, and a variety of treatment technologies have been developed. Among them, the reduction of zero-valent iron is a class of methods that has attracted much attention.

[0037] Raw water containing 100mg / L pentachlorophene was configured (configured using sodium pentachlorophenate). Use a peristaltic pump to feed water at a speed of 10rpm for 30d ( figure 1 ), every 24h high performance liquid chromatography measures the concentration of pentachlorophenol in the water. See the test results image 3 .

[0038] At the initial stage of operation, due to the pass...

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Abstract

The invention discloses a method for preparing a permeable reactive barrier for relieving passivation of zero-valent iron. The permeable reactive barrier is prepared from an oxygen-releasing nutrientlayer and a hydrolyzed microorganism-zero-valent iron layer at a volume ratio of 1 to 1. The oxygen-releasing nutrient layer is prepared from oxygen-releasing agent CaO2 particles and cheap soil slow-release fertilizer Woshibao particles at a volume ratio of 3 to 2. The hydrolyzed microorganisms in the hydrolyzed microorganism-zero-valent iron layer are prepared from biochar-immobilized microorganisms. The microorganism is Lactobacillus acidophilus. Biochar is prepared from corn straw by anoxic burning at 300 DEG C for 2 hours. The invention also discloses a method of immobilizing microorganisms by biochar. The method adopts microorganisms for hydrolyzing a passivation film on the surface of the zero-valent iron for the first time. The reaction condition is mild, the cost is low, and no secondary pollution is caused. The permeable reactive barrier provided by the invention has better removal effects on heavy metals and chlorine-containing organic pollutants. The method is simple in operation, low in cost and environmentally-friendly, and has a broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of a permeable reaction wall for alleviating passivation of zero-valent iron, and belongs to the technical field of environmental protection. Background technique [0002] In recent years, zero-valent iron permeable permeable reactive walls (Fe 0 -PRB) technology has risen rapidly due to its advantages of less investment, no secondary pollution, and basically no energy consumption. However, during the preparation of zero-valent iron, the surface will be covered with an oxide film due to air oxidation; at the same time, Fe(II) / Fe(III) generated during the removal of pollutants by zero-valent iron will form a precipitate and cover the zero-valent iron. A passivation film is formed on the surface to prevent the further reaction of zero-valent iron and pollutants. The passivation of zero-valent iron has become an important obstacle to promote the application of zero-valent iron technology and a bottleneck tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/20C02F101/36
CPCC02F3/34C02F2101/20C02F2101/36
Inventor 胡清远郑聪王思文闫磊黄佳敏方琳姗叶素慧
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