阅读说明：本技术 一种改性粘土的制备方法及其定向回收微藻的应用方法 (Preparation method of modified clay and application method of modified clay for directionally recycling microalgae ) 是由 李纪 高咏卉 暴雅琳 于源 于 2020-06-12 设计创作，主要内容包括：本发明公开了一种改性粘土的制备方法及其定向回收微藻的应用方法,涉及生物领域,将改性剂与粘土放入反应器中,加入一定量的去离子水,充分搅拌、混合均匀,配制成改性粘土悬浊液；在一定温度下老化一段时间之后,再离心、干燥、过筛,获得所述改性粘土。将所述改性粘土喷撒到富营养化水体中,在水体中形成絮凝,并吸附藻细胞；然后将铁粉微粒撒入水体,与所述水体已形成絮凝结合形成含铁粘土与藻细胞的絮凝复合物；最后将电磁回收装置下放水体中,通电后装置具有磁性,吸引所述含铁粘土与藻细胞的絮凝复合物于装置外壁后,从水体中取出并收集。本发明将被粘土吸附的藻类回收上岸,避免藻细胞沉降后营养盐的再释放,同时粘土改性后去除效率提高了。(The invention discloses a preparation method of modified clay and an application method of directionally recovering microalgae, relating to the field of biology.A modifier and clay are put into a reactor, a certain amount of deionized water is added, and the mixture is fully stirred and uniformly mixed to prepare modified clay suspension; after aging for a period of time at a certain temperature, centrifuging, drying and sieving to obtain the modified clay. Spraying the modified clay into eutrophic water to form flocculation in the water and adsorb algae cells; then, scattering iron powder particles into a water body, and forming flocculation combination with the water body to form a flocculation compound of iron-containing clay and algae cells; and finally, the electromagnetic recovery device is placed in the water body, the device has magnetism after being electrified, and the flocculation compound of the iron-containing clay and the algae cells is attracted to the outer wall of the device, taken out of the water body and collected. According to the invention, the algae adsorbed by the clay is recovered to shore, so that the re-release of nutrient salts after settlement of algae cells is avoided, and the removal efficiency after clay modification is improved.)

1. A process for the preparation of a modified clay, characterized in that it comprises the following steps:

step 1, putting a modifier and clay into a reactor, adding a certain amount of deionized water, fully stirring and uniformly mixing to prepare a modified clay suspension;

and 2, aging for a period of time at a certain temperature, centrifuging, drying and sieving to obtain the modified clay for later use.

2. The process for preparing a modified clay according to claim 1, wherein the modifier in step 1 is polyaluminum chloride.

3. The method of preparing a modified clay according to claim 2, wherein the clay in step 1 is kaolin.

4. The method of preparing a modified clay according to claim 3, wherein the kaolin clay to polyaluminum chloride mass ratio in step 1 is 5: 1.

5. The process for preparing a modified clay according to claim 1, wherein the certain temperature in step 2 is room temperature.

6. The process for preparing a modified clay according to claim 1, wherein the aging period of step 2 is 24 hours.

7. The method for applying the modified clay to directional recovery of microalgae according to claim 1, characterized in that the application method comprises the following steps:

step 1, spraying the modified clay into eutrophic water to form flocculation in the water and adsorb algae cells;

step 2, scattering iron powder particles into a water body, and forming a flocculation combination with the water body to form a flocculation compound containing iron clay and algae cells;

and 3, putting the electromagnetic recovery device into the water body, electrifying the electromagnetic recovery device, and then putting the electromagnetic recovery device into the water body, wherein the electromagnetic recovery device has magnetism, and the electromagnetic recovery device is taken out of the water body after attracting the flocculation compound containing the iron clay and the algae cells to the outer wall of the device.

8. The process for producing a modified clay according to claim 7, wherein the modified clay concentration in step 1 is 1.0 g/L.

9. The method for preparing modified clay according to claim 7, wherein the iron powder particles in step 2 are nano iron powder.

10. The method of preparing the modified clay of claim 9, wherein the nano iron powder concentration is 0.1 g/L.

Technical Field

The invention relates to the field of biology, in particular to a preparation method of modified clay and an application method of the modified clay for directionally recovering microalgae.

Background

The clay is the soil with little sand and viscosity, and the water is not easy to pass through the clay, so the clay has better plasticity. The clay mineral has plasticity after being wetted by water, can deform under a smaller pressure and can keep the original shape for a long time, has a large specific surface area, and particles with electronegativity, so the clay mineral has good physical adsorption and surface chemical activity, and has the capacity of exchanging with other cations, thereby having good adsorption and sedimentation properties in a water body.

At present, the problem of water environment pollution is gradually aggravated, and the water body often has the phenomena of large-density harmful microalgae blooms erupting in the water body and causing death of a large number of fishes, which are related to water eutrophication. How to better solve the problem of water pollution has attracted people's attention. Therefore, a method for adsorbing and settling harmful algal blooms in a water body by using clay appears. However, after the mixture is settled to the bottom of the water body, the phenomenon that the algae is remineralized and releases nutritive salt still occurs, and the problem of water body eutrophication cannot be solved well from the source. Therefore, there is a need to design a method for directionally recovering algae, which removes the algae from the water body and ensures that the algae and the nutrient salts contained therein are not released back into the water body again.

Therefore, those skilled in the art have been devoted to developing a method for preparing modified clay for the directed recovery of microalgae.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to directionally recover algae, so as to remove the algae from the water body and ensure that the algae and the nutritive salts contained therein are not released back into the water body again.

In order to achieve the above object, the present invention provides a method for preparing a modified clay, characterized in that the method comprises the steps of: step 1, putting a modifier and clay into a reactor, adding a certain amount of deionized water, fully stirring and uniformly mixing to prepare a modified clay suspension; and 2, aging for a period of time at a certain temperature, centrifuging, drying and sieving to obtain the modified clay for later use.

Further, the modifier in the step 1 is polyaluminium chloride.

Further, the clay in the step 1 is kaolin.

Further, the mass ratio 334 of the kaolin to the polyaluminium chloride in the step 1 is 5: 1.

Further, the certain temperature in step 2 is room temperature.

Further, the aging time of step 2 is 24 h.

The application method of the modified clay for directionally recovering the microalgae comprises the following steps: step 1, spraying the modified clay into eutrophic water to form flocculation in the water and adsorb algae cells; step 2, scattering iron powder particles into a water body, and forming a flocculation combination with the water body to form a flocculation compound containing iron clay and algae cells; and 3, putting the electromagnetic recovery device into the water body, electrifying the electromagnetic recovery device, and then putting the electromagnetic recovery device into the water body, wherein the electromagnetic recovery device has magnetism, and the electromagnetic recovery device is taken out of the water body after attracting the flocculation compound containing the iron clay and the algae cells to the outer wall of the device.

Further, the concentration of the modified clay in the step 1 is 1.0 g/L.

Further, the iron powder particles in step 2 are nano iron powder.

Further, the concentration of the nanometer iron powder is 0.1 g/L.

The invention has the following technical effects:

1) the algae adsorbed by the clay is recovered to shore, so that the re-release of nutrient salts after the settlement of algae cells is avoided;

2) the removal efficiency is improved after the clay is modified.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic illustration of a clay flocculation process according to a preferred embodiment of the present invention;

FIG. 2 is a schematic view of the process of combining iron powder with clay according to a preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of a directional adsorption process of an electromagnetic device according to a preferred embodiment of the present invention.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.