A method for treating heavy metals in groundwater by using biological manganese oxides and hydroxyapatite
A technology of biological manganese oxide and hydroxyapatite, which is applied in the restoration of polluted soil and other directions, can solve the problems of inability to deal with different types of heavy metals at the same time, the microbial activity is easily affected by the environment, and the inability to deal with multiple types at the same time. To achieve the effect of environmental friendliness, low treatment cost and convenient operation
Active Publication Date: 2022-07-26
ZHEJIANG UNIV OF TECH
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Problems solved by technology
Although this technology has high efficiency, it has high cost, single pollutant treatment, cannot treat multiple types of heavy metal pollutants at the same time, and is prone to secondary pollution.
In-situ bioremediation refers to the technology of using indigenous microorganisms or cultivated engineering bacteria to degrade pollutants in groundwater, but bioremediation can only degrade part of pollutants, and microbial activity is easily affected by the environment
[0005] Heavy metal pollution in groundwater is complex and diverse. Conventional treatment methods have disadvantages such as high cost and inability to treat different types of heavy metals at the same time.
Method used
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Embodiment
[0038] 1) Amplify the manganese oxidizing bacteria
[0039] The manganese oxidizing bacteria (Pseudomonas putida MnB1) were inoculated into liquid medium (nutrient broth 18g / L, the solvent was deionized water), and cultured for 2 days in a shaker at 150rpm at a temperature of 30°C . After the bacterial liquid is centrifuged, the original bacterial agent is obtained, and the original bacterial agent after centrifugation is suspended with clean water to obtain the manganese-oxidizing bacterial liquid. 600 is about 0.8. Then, biological manganese oxidation stimulators such as ferric citrate and ammonium chloride are added to the manganese-oxidizing bacteria solution to obtain a manganese-oxidizing bacteria repair solution containing 0.5 mg / L ferric citrate and 0.2 g / L ammonium chloride.
[0040] 2) In situ synthesis of hydroxyapatite
[0041] like figure 1 As shown, use quartz sand to simulate soil, and evenly fill the glass tank with quartz sand (the sand pile is a cuboid, a...
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The invention discloses a method for treating heavy metals in groundwater by utilizing biological manganese oxides and hydroxyapatite, that is, utilizing a low-temperature hydrothermal method to synthesize hydroxyapatite in situ, and then utilizing a manganese oxidizing bacterial agent and a biological manganese oxidizing stimulator. Finally, under the combined action of biological manganese oxide and hydroxyapatite, the purpose of in-situ simultaneous removal of Fe, Mn, As, Pb, Cu, Zn and other metal pollutants in groundwater is achieved. Compared with the simple in-situ synthesis of hydroxyapatite or manganese oxides for the treatment of various metal pollutants such as Fe, Mn, As, Pb, Cu, Zn in groundwater, the combination of hydroxyapatite and biological manganese oxides. Use to make pollutant removal more efficient. In addition, the invention has the characteristics of simple process, convenient operation, low cost, obvious effect and the like, and can be widely applied to heavy metal restoration of sandy soil and groundwater in my country.
Description
technical field [0001] The invention relates to a method for treating heavy metals in groundwater by utilizing biological manganese oxides and hydroxyapatite, and belongs to the field of heavy metal restoration in groundwater in environmental protection. Background technique [0002] Groundwater is an important water resource in my country, and it plays an important role in the survival and development of human beings. However, in recent years, due to the rapid development of industry and agriculture in my country and the unreasonable development and utilization of various resources by human beings, heavy metals enter groundwater through various channels, which eventually leads to serious heavy metal pollution of groundwater. According to reports, the Fe content in groundwater in the North China Plain is seriously exceeding the standard. In addition, 7.6% of the groundwater in this area is polluted by heavy metals, among which As, Pb and other heavy metals are distributed in...
Claims
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IPC IPC(8): B09C1/00
CPCB09C1/002
Inventor 何崭飞姬晴晴陈鑫潘响亮
Owner ZHEJIANG UNIV OF TECH