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Oxygen releasing material for permeable reactive barrier aerobic biodegradation of groundwater

A reaction grid, aerobic biological technology, applied in sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as limited life, achieve low cost, easy production, release Oxygen rate flattening effect

Inactive Publication Date: 2010-12-22
BEIJING INST OF WATER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010]Oxygen-releasing materials are used for in-situ remediation of groundwater, and their lifespan is limited. Generally, the filler has to be replaced after the grid has been in operation for 5-6 months (Kao C.M. , et al, Chemosphere, 2001, 44(5): 925-934)

Method used

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  • Oxygen releasing material for permeable reactive barrier aerobic biodegradation of groundwater
  • Oxygen releasing material for permeable reactive barrier aerobic biodegradation of groundwater
  • Oxygen releasing material for permeable reactive barrier aerobic biodegradation of groundwater

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Embodiment 1

[0038] 1.1 Materials and instruments

[0039] Calcium peroxide: industrial grade, 40% purity, the main impurity is Ca(OH) 2 (Tianjin Chilong Chemical Co., Ltd.);

[0040] Bentonite: Natural bentonite produced in Lin'an;

[0041] Sand: natural river sand, particle size less than 2mm;

[0042] Cement: 325# ordinary slag portland cement;

[0043] JJ-4A six-connected electric mixer.

[0044] 1.2 Preparation of two different oxygen-releasing materials

[0045] 1.2.1 Preparation of oxygen-releasing material 1 (without bentonite)

[0046] As shown in Table 1-1, weigh the set ratio of CaO 2 Put / cement / sand in a container, add a set amount of tap water, stir evenly, make cubes with a side length of 2-5cm, and air-dry under natural conditions.

[0047] 1.2.2 Preparation of oxygen-releasing material 2 (including bentonite)

[0048] (1) As shown in Table 1-1, weigh calcium peroxide and bentonite in a set ratio in a reaction vessel, and use a JJ-4A six-connected electric stirrer a...

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Abstract

The invention relates to an oxygen releasing material for permeable reactive barrier aerobic biodegradation of groundwater, which comprises the following components in percentage by weight: 5-20% of oxygen releasing compound, 5-20% of bentonite and the balance of coagulant. The oxygen releasing material added with the bentonite has the advantages of large oxygen releasing amount, long oxygen releasing time, low cost and easy preparation; and moreover, the used materials are all natural and easy to obtain and do not cause secondary pollution to the groundwater environment, thereby remarkably improving the in situ bioremediation technology of the contaminated groundwater.

Description

technical field [0001] The invention relates to an oxygen-releasing material for bioremediation of polluted groundwater, in particular to a novel oxygen-releasing material for aerobic biodegradation of groundwater permeable reaction grids. Background technique [0002] Permeable Reactive Barriers (PRBs) are an in-situ remediation technique for groundwater contamination, consisting of a permeable reactive medium placed downstream of a groundwater contamination plume, usually perpendicular to groundwater flow. When the polluted groundwater passes through the PRBs, a series of reactions such as precipitation, adsorption, oxidation-reduction, and biodegradation will occur between the pollutants and the active medium of the grid, thereby effectively removing the pollutants in the groundwater (Wu Junwen et al., 2005 ; Eykholt et al., 1999). Because this technology does not need to use pumps to pump out groundwater and above-ground treatment systems, it has low treatment costs, go...

Claims

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Application Information

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IPC IPC(8): C02F3/10C04B28/00
CPCY02W10/10
Inventor 刘培斌张崎伟刘菲谢李缪德仁刘海飞
Owner BEIJING INST OF WATER
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