Method for denitrifying rare earth ore wastewater by using supported microalgae

A rare earth ore, load-type technology, applied in mining wastewater treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of no carbon source in wastewater, long process flow, waste of resources, etc., and achieve total nitrogen and ammonia nitrogen removal capacity. High, simple process operation equipment, the effect of improving the nitrogen removal capacity

Pending Publication Date: 2020-07-31
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, rare earth mine wastewater has brought serious pollution and damage to the mine and surrounding areas.
Moreover, rare earth elements in wastewater are precious resources, direct discharge will not only damage the environment, but also a great waste of resources
[0003] At present, there are stripping methods, air stripping methods, chemical precipitation methods, breakpoint chlorination methods, electrodialysis methods, soil irrigation methods, liquid film methods, direct evaporation crystallization methods, etc. for the treatment of various rare earth ammonia nitrogen wastewater, but there are conditions Strict, high cost, complicated operation, general effect, etc., and the traditional biological law also has the problems of no carbon source for wastewater, long process flow, and can only deal with low and medium concentrations of ammonia nitrogen, and the treatment is difficult to meet the standard, so there is an urgent need for a effective treatment
[0004] Although the Chinese patent CN201810350723.2 effectively treats rare earth mine wastewater, the treatment period of half a month is too long, and there is still a long way to go before engineering, and further improvement is needed

Method used

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  • Method for denitrifying rare earth ore wastewater by using supported microalgae
  • Method for denitrifying rare earth ore wastewater by using supported microalgae
  • Method for denitrifying rare earth ore wastewater by using supported microalgae

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: Contrast experiment with or without corn cob carrier

[0051]Two groups of experiments, the first group of experiments only added the screened specific microalgae (Scenedes), and the second group added corn cob carrier (corncob) while adding Scenedesmus. The initial algae density of the experiment was 1g / L, and the amount of corncob carrier added in the second group of experiments was 20g / L. figure 1 Microalgae-loaded pictures for corncobs, figure 2 is the graph of total nitrogen and ammonia nitrogen changing with time, from figure 2 It can be observed that the addition of corn cob can effectively improve the removal efficiency of ammonia nitrogen and total nitrogen, and the removal rate of total nitrogen is from 4.7 mg·L without corn cob carrier. -1 d -1 Increased to 86.7mg·L -1 d -1 , and the removal capacity of ammonia nitrogen reaches 83.3mg·L -1 d -1 .

Embodiment 2

[0052] Embodiment 2: Different carrier comparative experiments

[0053] The initial algae density of the four experiments was 1.0g / L, the carrier of the first group was sponge, the carrier of the second group was straw, the carrier of the third group was a common biofilm carrier, and the carrier of the fourth group was corn core (corncob), the amount of carrier added is 20g / L, image 3 It is a graph showing the change of total nitrogen with time. Depend on image 3 It was evident that the optimal carrier was a corn cob carrier.

[0054] The average value of water quality in Example 1 and Example 2 after three days of corn-loaded microalgae treatment was compared before and after treatment, and the data are shown in Table 2. From Table 2, it can be concluded that within three days, corncob-loaded flocculation microalgae can completely denitrify rare earth mine wastewater, but the residence time of three days makes water acidification and COD exceed the standard during denitr...

Embodiment 3

[0058] After the microalgae pool reaction, although the ammonia nitrogen and total nitrogen in the purified water can reach the standard, the death and renewal of the algae metabolism and the hydrolysis of the corn cob will cause the COD of the water quality to slightly exceed the standard, and the water body will be weakly acidified. Therefore, the traditional activated sludge method is used to further treat the purified water, and the hydraulic retention time is initially optimized. Figure 4 It is the flow chart of the denitrification method of rare earth mine wastewater by loaded microalgae in Example 3. After the raw water of rare earth mine wastewater is treated with quicklime precipitation, a clarification tank is obtained, and then denitrification treatment is carried out through the microalgae pool, and then passed through the traditional active sewage. The mud method is used for post-treatment, followed by disinfection in turn to obtain effluent.

[0059] At the begi...

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Abstract

The invention provides a method for denitrifying rare earth ore wastewater by using supported microalgae, and belongs to the technical field of wastewater treatment. The invention provides a method for denitrifying rare earth ore wastewater by using supported microalgae, which comprises the following steps: carrying out quicklime precipitation on rare earth ore wastewater raw water to obtain clarified water; and denitrifying the clarified water, wherein the denitrification is carried out under the condition that flocculation microalgae and corncobs exist at the same time. According to the method provided by the invention, rapid, effective and economic treatment of the high-ammonia-nitrogen rare earth ore wastewater is realized; the total nitrogen and ammonia nitrogen removal capacity is high, the average ammonia nitrogen removal capacity is 83.3 mg. L <-1 >. d <-1 >, the average total nitrogen removal capacity is 86.7 mg.L <-1 >. d <-1 >, and the method further has a series of advantages of being low in treatment cost, simple in process operation equipment, stable in effect, environmentally friendly, capable of achieving rare earth element recycling and algae colony recycling and the like.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for denitrification of rare earth mine wastewater by loaded microalgae. Background technique [0002] Gannan ionic rare earth mine wastewater is now mainly using the "in-situ leaching process", and the leaching agent is mainly ammonium sulfate. Although this process has the potential to avoid huge mountain damage caused by ore mining and save A lot of manpower, material resources and sites, protecting the surface vegetation in the mining area, greatly slowing down the weathering of the mine by the original leaching agent sodium chloride, but the in-situ leaching process also brings new hazards, especially when the in-situ leaching process is compared with the "pool leaching process". ", the amount of leaching agent is larger, and an excessive amount of ammonium sulfate is generally used, which leads to high-concentration ammonium sulfate wastewater rich in r...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/16C02F103/10
CPCC02F3/322C02F1/66C02F2305/06C02F2101/16C02F2101/163C02F2103/10
Inventor 熊贞晟丁严严张亚昆罗旭彪杨利明邵鹏辉罗露
Owner NANCHANG HANGKONG UNIVERSITY
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