Method for restoring chromium-polluted underground water and permeable reaction wall
A permeable reaction wall and groundwater technology, which is applied in water pollutants, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of reaction wall blockage, high cost, iron corrosion, etc. Long-lasting, low-cost effects
Active Publication Date: 2015-04-29
PEKING UNIV
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Problems solved by technology
However, the cost of this treatment system is relatively expensive, and after a period of time, the iron is easily corroded due to the change of pH value, and the precipitation of its own iron minerals (such as hematite and maghemite) is formed. A reaction protective film is formed on the metal surface, which hinders the further progress of the reaction. With the accumulation of iron minerals and the growth of microorganisms, the reaction wall will be blocked, and the porosity and hydraulic conductivity of the reaction medium will decrease.
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Embodiment 1
[0034] Embodiment 1, construct permeable reaction wall and remediate chromium-contaminated groundwater
[0035] 1. Structure and operation of simulated column of permeable reactive wall
[0036] Such as figure 1 As shown, the plexiglass column has a length of 50cm and an inner diameter of 10cm. The bottom and top of the column are filled with 2mm thick asbestos and 1mm thick glass beads respectively, and the middle body part is filled with a mixture of bark and sand (volume ratio 6:4). A water inlet and a water outlet are respectively set at the bottom and the top, and five sampling ports are respectively set at 5cm, 15cm, 25cm, 35cm, and 45cm from the bottom. The operating parameters of the column are shown in Table 2.
[0037] Table 2 Operating parameters of the simulated column of the permeable reactive wall
[0038]
[0039] Composition of simulated water: 1g MgSO 4 ·7H 2 O, 0.5g CaCl 2 2H 2 O, 19g KH 2 PO 4 , 17g Na 2 HPO 4 , 114.6g Na 2 Cr 2 o 7 2H 2 O ...
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Abstract
The invention discloses a method for restoring chromium-polluted underground water and a permeable reaction wall. The filling medium of the permeable reaction wall disclosed by the invention is a mixture of fermented bark and sand in a volume ratio of (10-5):(0-5), but the amount of sand is not zero. The method for restoring chromium-polluted underground water comprises the following step: passing chromium-polluted underground water through the permeable reaction wall. The permeable reaction wall disclosed by the invention has the advantages of low cost and long operating time, and therefore, has wide application prospects in the field of chromium-polluted underground water restoration.
Description
technical field [0001] The invention relates to a method for repairing groundwater polluted by chromium and a permeable reaction wall thereof. Background technique [0002] The groundwater in most parts of my country has been polluted by heavy metal chromium to varying degrees. The sources are the discharge of industrial and mining waste water, the stacking of industrial and domestic waste, the replenishment of polluted surface water, the excessive application of chemical fertilizers and pesticides, and substandard reclaimed water for irrigation. [0003] Permeable reactive wall (PRB) is an in-situ technology for treating polluted groundwater. It usually uses zero-valent iron or iron-based bimetal as the reaction medium, and removes pollutants through the chemical reduction reaction of iron to pollutants. However, the cost of this treatment system is relatively expensive, and after a period of time, the iron is easily corroded due to the change of pH value, and the precipita...
Claims
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IPC IPC(8): C02F3/34C02F3/28C02F101/22
Inventor 卢晓霞杨君君侯珍张琪张姝
Owner PEKING UNIV