阅读说明：本技术 一种改性蛋壳去除水中总氮的方法 (Method for removing total nitrogen in water by using modified eggshells ) 是由 李红翠 颜菲菲 于 2019-08-28 设计创作，主要内容包括：本发明提供一种改性蛋壳去除水中总氮的方法,属于含氮污水的处理领域,该改性蛋壳去除水中总氮的方法具体步骤为准备工作；改性过程,选取废弃蛋壳,对蛋壳进行加工,对蛋壳进行干燥处理；除氮过程,选取蛋壳粉,对蛋壳粉进行加工。本发明改性后的蛋壳吸附能力大大提升,对于废水中总氮的处理效率也显著提升,为废水处理提供了一个效果良好的吸附剂。(The invention provides a method for removing total nitrogen in water by using a modified eggshell, belonging to the field of treatment of nitrogen-containing sewage; in the modification process, waste eggshells are selected, processed and dried; and in the nitrogen removal process, selecting the eggshell powder, and processing the eggshell powder. The modified eggshell greatly improves the adsorption capacity, obviously improves the treatment efficiency of the total nitrogen in the wastewater, and provides an adsorbent with good effect for wastewater treatment.)

1. A method for removing total nitrogen in water by using modified eggshells is characterized by comprising the following steps:

the method comprises the following steps: preparing, namely respectively placing an iron salt solution and waste eggshells on a workbench in a greenhouse;

step two: modification process;

the first step is as follows: selecting waste eggshells, and removing impurities in the waste eggshells placed on a workbench;

the second step is that: processing eggshells, grinding the eggshells into powder by using a grinder, then preparing 0.5mol/L ferric salt solution, mixing the concentration of the ferric salt solution and the mass of the eggshell powder in a ratio of three to one, and simultaneously stirring the ferric salt solution and the eggshell powder for twenty-two hours to twenty-five hours by using a stirrer in a greenhouse;

the third step: drying the eggshells, placing the ferric salt solution and the eggshell powder in a drying oven after stirring, drying the material obtained by mixing the ferric salt solution and the eggshell powder by using a temperature controller at seventy-five to fifty ℃, simultaneously screening by using a screen of ninety to one hundred and ten meshes, and then placing the ferric salt solution and the eggshell powder in the drying oven for later use;

step three: a nitrogen removal process;

the first step is as follows: selecting eggshell powder, weighing 0.025 g, 0.075 g, 0.1 g, 0.25 g, 0.5 g, 0.75 g and 1.0 g of modified eggshell powder, and adding the modified eggshell powder into 100 ml of nitrogen-containing solution with the concentration of 100m g/L;

the second step is that: processing eggshell powder, adjusting the pH value of the solution to 1, 3, 5, 7, 9 and 11, and stirring in a magnetic stirrer at room temperature for ten minutes to seventy minutes;

the third step: filtering the processed material, and filtering the modified eggshell powder by using a filter membrane of 0.5-0.4 mu m.

2. The method for removing total nitrogen in water by modifying eggshells as recited in claim 1, wherein in step two, the time for water drainage in said second step is set to be ten minutes to fifteen minutes.

3. The method of claim 1, wherein in step two, the concentration of the ferric salt solution in step two is mixed with the mass of the eggshell powder in a two to one ratio.

4. The method of claim 1, wherein in step two, the concentration of the ferric salt solution in the second step is mixed with the weight of the eggshell powder in a ratio of two to two.

5. The method of modifying eggshells to remove total nitrogen from water as in claim 1 wherein in step two of said second step said solution of ferric salt and eggshell are agitated for a period of time in the range of twenty three hours to twenty five hours.

6. The method of modifying eggshells to remove total nitrogen from water as in claim 1 wherein said second step is conducted by stirring said solution of iron salt and said eggshell for twenty-four hours.

7. The method of modifying egg shells to remove total nitrogen from water as recited in claim 1, wherein in step S, said third step is dried within sixty degrees celsius.

8. The method of claim 1, wherein in step two, the third step is performed by using a one hundred mesh screen.

9. The method of modifying egg shells to remove total nitrogen from water of claim 1, wherein in step three of S, said second step is stirred for twenty to seventy minutes.

10. The method for removing total nitrogen in water with modified eggshell as claimed in claim 1, wherein in step three, said modified eggshell powder is filtered with a 0.45 μm filter membrane in said third step.

Technical Field

The invention belongs to the technical field of treatment of nitrogen-containing sewage, and particularly relates to a method for removing total nitrogen in water by using modified eggshells.

Background

The continuous development of society and economy and the use of a large amount of chemical fertilizers and pesticides enable substances rich in nitrogen to continuously flow into water bodies such as lakes, rivers, oceans and the like, so that algae and plankton are rapidly propagated, dissolved oxygen in the water body is consumed, aquatic organisms die due to oxygen deficiency, water pollution is increasingly serious, and the problem of water eutrophication is obvious. Disasters such as water bloom, red tide and the like occur frequently, not only influence the survival of aquatic organisms, but also seriously threaten human health. One of the keys to reducing the eutrophication problem of water is to remove the total nitrogen in water.

At present, the methods for removing nitrogen at home and abroad are biological methods, precipitation methods, adsorption methods, ion exchange methods and the like. The adsorption method for removing the total nitrogen in the water is a current research hotspot, the adsorption method is simple in process, various in adsorbent types and wide in application range, and the method is concerned about the treatment of wastewater. Common adsorbents include activated carbon, biochar, zeolite and the like, and eggshell has a utilization value as a waste. At present, researches on living wastes such as banana peels, peanut peels, shaddock peels, straws and the like are carried out, and a series of experiments prove that the treatment effect is similar to that of the traditional adsorption effect. The eggshell, as a domestic waste, has rich resources and low cost, and the main component of the eggshell is calcium carbonate, so that the eggshell has a developed pore structure and good adsorption capacity.

However, the prior art has the problem that the eggshell has poor capability of removing nitrogen in wastewater.

Therefore, it is necessary to develop a method for removing total nitrogen in water by modifying eggshells.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for removing total nitrogen in water by modifying eggshells, which aims to solve the problem of poor capability of removing nitrogen in wastewater by the eggshells in the prior art, and the method for removing the total nitrogen in water by modifying the eggshells specifically comprises the following steps:

the method comprises the following steps: preparing, namely respectively placing an iron salt solution and waste eggshells on a workbench in a greenhouse;

step two: modification process;

the first step is as follows: selecting waste eggshells, and removing impurities in the waste eggshells placed on a workbench;

the second step is that: processing eggshells, grinding the eggshells into powder by using a grinder, then preparing 0.5mol/L ferric salt solution, mixing the concentration of the ferric salt solution and the mass of the eggshell powder in a ratio of three to one, and simultaneously stirring the ferric salt solution and the eggshell powder for twenty-two hours to twenty-five hours by using a stirrer in a greenhouse;

the third step: drying the eggshells, placing the ferric salt solution and the eggshell powder in a drying oven after stirring, drying the material obtained by mixing the ferric salt solution and the eggshell powder by using a temperature controller at seventy-five to fifty ℃, simultaneously screening by using a screen of ninety to one hundred and ten meshes, and then placing the ferric salt solution and the eggshell powder in the drying oven for later use;

step three: a nitrogen removal process;

the first step is as follows: selecting eggshell powder, weighing 0.025 g, 0.075 g, 0.1 g, 0.25 g, 0.5 g, 0.75 g and 1.0 g of modified eggshell powder, and adding the modified eggshell powder into 100 ml of nitrogen-containing solution with the concentration of 100m g/L;

the second step is that: processing eggshell powder, adjusting the pH value of the solution to 1, 3, 5, 7, 9 and 11, and stirring in a magnetic stirrer at room temperature for ten minutes to seventy minutes;

the third step: filtering the processed material, and filtering the modified eggshell powder by using a filter membrane of 0.5-0.4 mu m.

Preferably, in the second step, the concentration of the iron salt solution in the second step and the mass of the eggshell powder are mixed in a two-to-one ratio.

Preferably, in the second step, the concentration of the iron salt solution in the second step is mixed with the mass of the eggshell powder in a ratio of two to two.

Preferably, in step two, the iron salt solution and the ground eggshell are stirred for twenty-three hours to twenty-five hours in the second step.

Preferably, in step two, the iron salt solution and the ground eggshell are stirred for twenty-four hours in the second step.

Preferably, in step two, the third step is dried within sixty-five to fifty degrees celsius.

Preferably, in step two, the third step is dried within sixty degrees celsius.

Preferably, in the second step, the third step is performed by using a screen with one hundred meshes to one hundred and ten meshes.

Preferably, in step two, the third step is performed by using a one-hundred mesh screen.

Preferably, in step three, the second step is stirred for twenty to seventy minutes.

Preferably, in step three, the second step is stirred for fifty-ten minutes.

Preferably, in step three, the modified ground eggshell is filtered in the third step with a 0.45 μm to 0.4 μm filter membrane.

Preferably, in step three, the modified ground eggshell is filtered in the third step with a 0.45 μm filter membrane.

Compared with the prior art, the invention has the following beneficial effects: the method for removing the total nitrogen in the water by using the modified eggshell is widely applied to the field of treatment of nitrogen-containing sewage. The modified eggshell greatly improves the adsorption capacity, obviously improves the treatment efficiency of the total nitrogen in the wastewater, and provides an adsorbent with good effect for wastewater treatment.

Drawings

Fig. 1 is a flow chart of a method for removing total nitrogen in water by modifying eggshells.

Fig. 2 is a modification process flow diagram.

Fig. 3 is a flow chart of a nitrogen removal process.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

in the figure:

as shown in figures 1 to 3

The method for removing total nitrogen in water by using modified eggshells specifically comprises the following steps:

s101: preparing, namely respectively placing an iron salt solution and waste eggshells on a workbench in a greenhouse;

s102: modification process;

s201: selecting waste eggshells, and removing impurities in the waste eggshells placed on a workbench;

s201: processing eggshells, grinding the eggshells into powder by using a grinder, then preparing 0.5mol/L ferric salt solution, mixing the concentration of the ferric salt solution and the mass of the eggshell powder in a ratio of three to one, and simultaneously stirring the ferric salt solution and the eggshell powder for twenty-two hours to twenty-five hours by using a stirrer in a greenhouse;

s203: drying the eggshells, placing the ferric salt solution and the eggshell powder in a drying oven after stirring, drying the material obtained by mixing the ferric salt solution and the eggshell powder by using a temperature controller at seventy-five to fifty ℃, simultaneously screening by using a screen of ninety to one hundred and ten meshes, and then placing the ferric salt solution and the eggshell powder in the drying oven for later use;

s103: a nitrogen removal process;

s301: selecting eggshell powder, weighing 0.025 g, 0.075 g, 0.1 g, 0.25 g, 0.5 g, 0.75 g and 1.0 g of modified eggshell powder, and adding the modified eggshell powder into 100 ml of nitrogen-containing solution with the concentration of 100m g/L;

s302: processing eggshell powder, adjusting the pH value of the solution to 1, 3, 5, 7, 9 and 11, and stirring in a magnetic stirrer at room temperature for ten minutes to seventy minutes;

s303: filtering the processed material, and filtering the modified eggshell powder by using a filter membrane of 0.5-0.4 mu m.

Preferably, in S102, the concentration of the ferric salt solution in S202 is mixed with the mass of the eggshell powder in a two-to-one ratio.

Preferably, in S102, the concentration of the iron salt solution in S202 is mixed with the mass of the eggshell powder in a ratio of two to two.

Preferably, in S102, the iron salt solution and the eggshell powder are stirred in S202 for twenty-three hours to twenty-five hours.

Preferably, in S102, the iron salt solution and the eggshell powder are stirred for twenty-four hours in S202.

Preferably, in S102, the drying in S203 is performed within sixty-five degrees celsius to fifty degrees celsius.

Preferably, in S102, the drying in S203 is performed within sixty degrees celsius.

Preferably, in S102, the screen is sifted in S203 by using a screen of one hundred meshes to one hundred and ten meshes.

Preferably, in S102, the screen is moved by using one hundred screens in S203.

Preferably, in S103, the stirring in S302 is performed for twenty to seventy minutes.

Preferably, in S103, the mixture is stirred in S302 for fifty-ten minutes.

Preferably, in S103, the modified ground eggshell is filtered in S303 by using a 0.45 μm to 0.4 μm filter membrane.

Preferably, in S103, the modified ground eggshell is filtered in S303 by using a 0.45 μm filter membrane.

Table 1 orthogonal experimental results of total nitrogen adsorption by unmodified eggshells

Table 2 modified eggshell adsorption total nitrogen orthogonal experimental results