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Method for treating rare earth ore mining wastewater by adding inorganic carbon source reinforced microalgae

A technology of mining wastewater and inorganic carbon source, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of difficult domestication, high operating costs, and unfavorable physiological activity of nitrifying and denitrifying bacteria. impact, etc.

Inactive Publication Date: 2020-06-30
NANCHANG HANGKONG UNIVERSITY
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  • Description
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Problems solved by technology

Although the breakpoint chlorination method has less investment, the operating cost is higher, and the by-products will cause secondary pollution
Moreover, the breakpoint chlorination method and ion exchange method are not suitable for wastewater with high concentration of ammonia nitrogen.
Although the ammonia stripping method is suitable for treating wastewater with high concentration of ammonia nitrogen, the stripping efficiency has many factors and is difficult to control
In the biological nitrification and denitrification method, nitrification and denitrification bacteria have strict requirements on pH and temperature, and are not easy to domesticate. In addition, a large amount of organic matter needs to be added in the later operation, and an anoxic environment must be provided. When the temperature is lower than 30°C, the treatment efficiency is significantly reduced. High concentrations of sulfate radicals can also adversely affect the physiological activity of nitrifying and denitrifying bacteria

Method used

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  • Method for treating rare earth ore mining wastewater by adding inorganic carbon source reinforced microalgae
  • Method for treating rare earth ore mining wastewater by adding inorganic carbon source reinforced microalgae
  • Method for treating rare earth ore mining wastewater by adding inorganic carbon source reinforced microalgae

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preparation example Construction

[0032] The present invention does not specifically limit the source of the mixed microalgae. Specifically, in the present invention, the preparation method of the mixed microalgae preferably includes the following steps:

[0033] Mix rare earth mining wastewater with phosphorus-containing compounds to obtain microalgae domestication wastewater;

[0034] The domesticated microalgae is obtained by mixing the microalgae domestication waste water with the algae source water; the algae source water contains Chlorella and Chlorella;

[0035] The domesticated microalgae are enriched and amplified to obtain mixed microalgae.

[0036] The invention mixes rare earth ore mining wastewater and phosphorus-containing compounds to obtain microalgae domestication wastewater. In the present invention, the nitrogen-to-phosphorus ratio of the microalgae domestication wastewater is preferably 5 to 6:0.5 to 1.5, more preferably 5:1; The optional range is preferably consistent with the above tech...

Embodiment 1

[0052] The preparation method of the mixed microalgae of chlorella and chlorococcus comprises the following steps:

[0053] (1) Add 1L of rare earth ore mining wastewater into the beaker, adjust the nitrogen-phosphorus ratio of the rare earth ore mining wastewater to 5:1 with dipotassium hydrogen phosphate, then add 0.5mL of river water, at a temperature of 28°C and a humidity of 60% 30 days of domestication under natural light conditions (specifically carried out in an open environment exposed to the air), to obtain domesticated microalgae;

[0054] (2) Prepare 1L liquid medium for use, the specific formula is Na 2 CO 3 1500mg / L, K 2 HPO 4 40mg / L, MgSO 4 50mg / L, CaCl 2 20mg / L, ferric citrate 6mg / L, agar 20g / L and the rest of water;

[0055] (3) Take 0.5 mL of the domesticated microalgae at the bottom of the beaker in step (1), inoculate it in the liquid medium of step (2), and then put it into a constant temperature room. Under the condition of 10000Lx (using the LED l...

Embodiment 2

[0057] (1) Dipotassium hydrogen phosphate is used to adjust the nitrogen-phosphorus ratio of rare earth mining wastewater to be 5:1, and then it is divided into three parts, and 0g / L sodium carbonate, 0.5g / L sodium carbonate, and 1g / L sodium carbonate are added respectively to obtain Three parts of waste water to be purified;

[0058] (2) Get the mixed microalgae of Chlorella prepared in Example 1 and Chlorococcus, add respectively in three parts of waste water to be purified in step (1), each part of waste water to be purified is 1L, wherein, with According to the dry weight of the mixed microalgae, the dosage of the mixed microalgae in each part of waste water to be purified is 2.5g, and then the temperature is 26°C, the humidity is 55%, and the light intensity is 8000Lx (using LED lamp tubes to provide light) Purification treatment was carried out for 15 hours under certain conditions; after the purification treatment was completed, the obtained system was naturally settled...

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Abstract

The invention provides a method for treating rare earth ore mining wastewater by adding an inorganic carbon source to reinforce microalgae, and belongs to the technical field of wastewater treatment.The method comprises the following steps: mixing rare earth ore mining wastewater, a phosphorus-containing compound and an inorganic carbon source to obtain wastewater to be purified; and purifying the to-be-purified wastewater by using mixed microalgae, wherein the mixed microalgae are chlorella and chlorococcum-like. According to the method, the performance of the microalgae is enhanced by utilizing an external inorganic carbon source, rapid denitrification of the rare earth ore mining wastewater can be realized, the treatment efficiency is high, the denitrification effect is good, and the method also has the characteristics of low cost, easiness in implementation and environmental friendliness. The result of the embodiment shows that when the method provided by the invention is used fortreating the rare earth ore mining wastewater, the obtained purified water can meet the discharge requirement of the first-grade standard A (50mg / L) of Discharge Standard of Pollutants for MunicipalWastewater Treatment Plant (GB18918-2002).

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for strengthening microalgae to treat rare earth mining wastewater by adding an inorganic carbon source. Background technique [0002] At present, ammonium salt chemical leaching in-situ mining method is usually used in the rare earth mining process, which requires a large amount of ammonium sulfate as the extraction solution, so the wastewater generated by mining contains a large amount of sulfate ions and ammonium ions, which will cause rare earth Ammonia nitrogen and nitrate nitrogen pollutants in mine drainage have increased significantly. This kind of wastewater has monotonous composition and is not easy to treat. It affects the environment and threatens human health. [0003] The methods currently used to treat rare earth mining wastewater include breakpoint chlorination, ion exchange, ammonia stripping, and biological nitrification and denitrification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
CPCC02F3/322
Inventor 杨利明耿燕妮罗旭彪张亚昆熊贞晟邵鹏辉石慧
Owner NANCHANG HANGKONG UNIVERSITY
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