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CN-122006657-A - Iron-manganese composite oxidation modified filter material and method for removing short-chain chlorinated paraffin in groundwater

CN122006657ACN 122006657 ACN122006657 ACN 122006657ACN-122006657-A

Abstract

The invention belongs to the technical field of in-situ restoration of groundwater pollution, and discloses a ferromanganese composite oxidation modified filter material and a method for removing short-chain chlorinated paraffin in groundwater, wherein a continuously coated ferromanganese composite oxidation film layer with a porous structure is constructed on the surface of quartz sand, and stable consolidation is realized by an inorganic gelation mode, the filter material has high specific surface area and good mechanical stability, not only obviously improves the adsorption and enrichment capacity of short-chain chlorinated paraffin, but also avoids the problem of falling of active components in long-term operation, and fundamentally improves the service life and engineering feasibility of the filter material.

Inventors

  • CHENG YA
  • ZHANG RUI
  • GAO YIJIE
  • WEN GANG
  • WAN QIQI

Assignees

  • 西安建筑科技大学

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. The ferromanganese composite oxidation modified filter material is characterized by comprising quartz sand, wherein the surface of the quartz sand is coated with a ferromanganese composite oxidation film layer formed by slurry consolidation, and the ferromanganese composite oxidation film layer is of a continuous coating structure and has a porous surface morphology.
  2. 2. The ferromanganese composite oxidation modified filter material according to claim 1, wherein the ferromanganese composite oxidation film layer accounts for 20% -35% of the total mass of the filter material, the ferromanganese composite oxidation film layer comprises iron oxide and manganese oxide, and the mass ratio of the iron oxide to the manganese oxide is (1.5-2.5): 1.
  3. 3. The ferromanganese composite oxidation modified filter material according to claim 1, wherein the ferromanganese composite oxidation film layer is fixed on the surface of quartz sand through inorganic gelation.
  4. 4. The ferro-manganese composite oxidation modified filter material according to claim 1, wherein the iron oxide is a composite of ferric oxide and ferric hydroxide, and the manganese oxide is a composite of manganese dioxide and trimanganese tetroxide.
  5. 5. The ferro-manganese composite oxidation modified filter material according to claim 1, wherein the ferro-manganese composite oxidation film layer is of a loose porous structure and has micron-sized pores and an irregular rough surface.
  6. 6. A method for preparing the ferro-manganese composite oxidation modified filter material of any one of claims 1-5, comprising the steps of: Step one, adding iron oxide, manganese oxide and inorganic cementing material into water to form uniform slurry; Step two, quartz sand is added into the slurry, and homogenization treatment is carried out under the constant temperature condition, so that the slurry is coated on the surface of the quartz sand; And thirdly, drying and solidifying the coated quartz sand to enable the ferro-manganese composite oxide film layer to be stably attached to the surface of the quartz sand, so as to obtain the ferro-manganese composite oxidation modified filter material.
  7. 7. The method of preparing the ferro-manganese composite oxidation modified filter material according to claim 6, wherein the prepared ferro-manganese composite oxidation modified filter material is stored in a wet storage mode.
  8. 8. A method for removing short-chain chlorinated paraffin in groundwater by using the ferromanganese composite oxidation modified filter material according to any one of claims 1-5, which is characterized in that the ferromanganese composite oxidation modified filter material is used as an adsorption medium to be filled in a water treatment device, so that groundwater flows through the ferromanganese composite oxidation modified filter material, and the short-chain chlorinated paraffin is adsorbed and enriched through the porous structure of the ferromanganese composite oxidation film of the ferromanganese composite oxidation modified filter material.
  9. 9. The method for removing short-chain chlorinated paraffin from groundwater by using the ferromanganese composite oxidation modified filter material according to claim 8, wherein the water treatment device is a permeable reactive barrier device.
  10. 10. The method for removing short-chain chlorinated paraffin from groundwater by using the ferromanganese composite oxidation modified filter material according to claim 9, wherein only a single filter material layer is arranged in the permeable reactive barrier device.

Description

Iron-manganese composite oxidation modified filter material and method for removing short-chain chlorinated paraffin in groundwater Technical Field The invention belongs to the technical field of in-situ restoration of groundwater pollution, and particularly relates to a ferromanganese composite oxidation modified filter material and a method for removing short-chain chlorinated paraffin in groundwater. Background Short-chain chlorinated paraffins (SCCPs) are chlorinated alkane mixtures with 10-13 carbon atoms, are typical persistent organic pollutants, have the characteristics of difficult degradation, strong bioaccumulation and obvious toxicity, and are widely applied to links such as industrial plasticization, flame retardance and the like. The pollutants can enter underground water through the ways of industrial wastewater discharge, solid waste leakage and the like, are frequently detected in various underground water in China, have serious threat to drinking water safety and ecological environment stability for a long time, and become a key problem in the field of underground water pollution restoration. The technology for removing short-chain chlorinated paraffin from underground water mainly comprises a physical adsorption method, a chemical oxidation method, a biodegradation method and a composite repair technology, and can be classified into ectopic repair and in-situ repair according to repair modes. The in-situ repair can realize the on-site treatment of the underground water with little disturbance to the environment, wherein the permeable reactive barrier technology is used as one of core technologies for in-situ repair of the underground water, and the in-situ repair has the advantages of no need of large-scale water pumping, low running cost and simple and convenient operation and maintenance, thereby being widely focused and applied in pollutant interception and removal. At present, although ferromanganese composite oxidation modified filter materials are used for removing water-soluble organic pollutants such as bisphenol A, tetracycline and the like, special removal researches on durable chlorinated alkanes such as short-chain chlorinated paraffin in groundwater are not deep, and a technical scheme of a system is not formed yet by adapting filter material preparation processes, permeable reactive barrier device parameters and practical application process conditions of the pollutants. When the existing permeable reactive barrier technology is used for repairing the organic pollution of the underground water, conventional filter materials or composite functional fillers are mostly adopted, and aiming at the removal of short-chain chlorinated paraffin, a special process for adapting to the ferromanganese composite oxidation modified filter material is not formed, so that the removal advantage of the filter material is difficult to develop. Therefore, the permeable reactive barrier application process based on the ferromanganese composite oxidation modified filter material is developed, key parameters of filter material preparation and device application are optimized, a method for removing short-chain chlorinated paraffin in underground water is established, and the method has important practical application value for realizing high-efficiency and low-cost in-situ restoration of the pollutants and adapting to multi-scene application requirements. Disclosure of Invention The invention aims to solve the problem that the removal efficiency and engineering applicability are difficult to be compatible due to the lack of a systematic application scheme for synergistically optimizing the ferro-manganese composite oxidation modified filter material, the permeable reactive barrier structure and the operation parameters in the prior art, and provides the ferro-manganese composite oxidation modified filter material and a method for removing short-chain chlorinated paraffin in groundwater. In order to achieve the above purpose, the invention adopts the following technical scheme: In the first aspect, the invention provides a ferromanganese composite oxidation modified filter material, which comprises quartz sand, wherein the surface of the quartz sand is coated with a ferromanganese composite oxide film layer formed by slurry consolidation, and the ferromanganese composite oxide film layer is in a continuous coating structure and has a porous surface morphology. The invention is further improved in that the iron-manganese composite oxide film layer accounts for 20% -35% of the total mass of the filter material, and comprises iron oxide and manganese oxide, and the mass ratio of the iron oxide to the manganese oxide is (1.5-2.5): 1. The invention is further improved in that the iron-manganese composite oxide film layer is fixed on the surface of quartz sand through inorganic gelation. The invention is further improved in that the iron oxide is a compound of ferric oxide and ferric hydroxide, and the man