CN115893621A - Composite plant water purifying agent and preparation method and application thereof - Google Patents
Composite plant water purifying agent and preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of water purification, and particularly relates to a compound plant water purifying agent and a preparation method and application thereof; the water purifying agent comprises the following components in parts by weight: 10-20 parts of quaternary ammonium salt chitosan, 15-25 parts of moringa seed extract, 15-25 parts of goldenrain tree seed extract, 10-20 parts of Chinese yam extract, 10-20 parts of sweet potato extract, 10-20 parts of banana peel extract, 10-20 parts of shaddock peel extract and 5-15 parts of polyacrylamide.
Description
Technical Field
The technical field of water purification, in particular to a compound plant water purifying agent and a preparation method and application thereof.
Background
Under the severe situation of water resource shortage, the problem of water resource pollution still continuously appears and becomes increasingly serious. The continuous occurrence of the problems of water resource shortage, pollution and the like highlights that the application of the water treatment technology is indispensable in the global scope and accelerates the research and development of the water treatment technology.
The water treatment technology is a technology for removing pollutants in a water body and purifying the water body to ensure that the water body can reach relevant specified standards by certain methods or equipment. The coagulation/flocculation process can be combined with other treatment units as well as with a separate treatment system. Compared with other water treatment technologies, the coagulation/flocculation method has the advantages of low cost, low energy consumption and easy operation, can remove 65-95% of colloidal particles and 80-95% of suspended particles and algae organic matters in the water body, is most effective in treating turbidity and chromaticity of the water body, and can reduce COD. Therefore, it has wide application in both feedwater and wastewater treatment, where coagulation/flocculation is the most frequently and centrally used method. At present, millions of tons of coagulation/flocculating agents are needed for domestic industrial water, urban water supply and sewage treatment every year, and the research and development trend of the coagulation/flocculating agents gradually goes from a single-component low-molecular form to a composite high-molecular form, so that the research on novel, efficient, cheap and pollution-free coagulation/flocculating agents has very important significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, one purpose of the invention is to provide a compound plant water purifying agent, the other purpose of the invention is to provide a preparation method of the compound plant water purifying agent, and the third purpose of the invention is to provide an application of the compound plant water purifying agent in water purification. The water purifying agent has the advantages of rich raw material sources, low price, easy obtainment, low residual toxicity in water, easy biodegradation, excellent water purifying effect of the compound formula, capability of effectively removing turbidity, chroma, suspended matters, COD (chemical oxygen demand) and the like in water, simple operation of the treatment method, stable operation and particular suitability for application in water supply treatment and advanced treatment.
The technical scheme of the invention is as follows:
a compound plant water purifying agent comprises the following components: quaternary ammonium salt chitosan, plant extract and polyacrylamide.
Preferably, the plant extract is moringa seed extract, goldenrain seed extract, chinese yam extract, sweet potato extract, banana peel extract, and grapefruit peel extract.
Preferably, the components consist of: 20-40 parts of quaternary ammonium salt chitosan, 15-25 parts of moringa seed extract, 15-25 parts of goldenrain seed extract, 10-20 parts of Chinese yam extract, 10-20 parts of sweet potato extract, 10-20 parts of banana peel extract, 10-20 parts of shaddock peel extract and 5-15 parts of polyacrylamide.
Further preferably, the components consist of: 25-35 parts of quaternary ammonium salt chitosan, 18-22 parts of moringa seed extract, 18-22 parts of goldenrain seed extract, 13-18 parts of Chinese yam extract, 13-18 parts of sweet potato extract, 15-20 parts of banana peel extract, 15-20 parts of shaddock peel extract and 8-12 parts of polyacrylamide.
The applicant has unexpectedly found in a large number of experiments that the water purifying effect of the water purifying agent of the invention is realized under the following specific component ratios
The best fruit is obtained, wherein the quaternary ammonium salt chitosan accounts for 30 parts, the moringa seed extract accounts for 20 parts, the goldenrain seed extract accounts for 20 parts, the Chinese yam extract accounts for 15 parts, the sweet potato extract accounts for 15 parts, the banana peel extract accounts for 16 parts, the shaddock peel extract accounts for 16 parts, and the polyacrylamide accounts for 10 parts.
A preparation method of a compound plant water purifying agent comprises the following preparation methods of extracts:
the preparation method of the moringa seed extract comprises the following steps: drying moringa seeds in the sun, removing shells, crushing by a crusher, adding 10-20 times of distilled water, fully stirring for 30 minutes, leaching in a water bath at 40 ℃ for 4-5 hours, filtering, collecting filtrate, centrifugally separating to obtain a wet extract, and drying at 40 ℃ to constant weight to obtain the moringa seed extract.
The preparation method of the Luan Shuzi extract comprises the following steps: luan Shuzi air drying, removing shell, pulverizing, adding 10-20 times of distilled water, stirring for 30 min, leaching in 40 deg.C water bath for 4-5 hr, filtering, collecting filtrate, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain Moringa seed extract.
The preparation method of the Chinese yam extract comprises the following steps: peeling and cleaning rhizoma Dioscoreae, pulverizing with a pulverizer, adding 3-5 times of distilled water, stirring thoroughly for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, adding 3-5 times of anhydrous ethanol into the filtrate, stirring thoroughly for 30 min, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain rhizoma Dioscoreae extract.
The preparation method of the sweet potato extract comprises the following steps: peeling and cleaning sweet potato, pulverizing with a pulverizer, adding 3-5 times of distilled water, stirring thoroughly for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, adding 3-5 times of anhydrous ethanol into the filtrate, stirring thoroughly for 30 min, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain sweet potato extract.
The preparation method of the banana peel extract comprises the following steps: drying banana peel at 60 ℃, crushing by a crusher, adding 10-15 times of 1.5mol/L sodium chloride solution, fully stirring for 30 minutes, leaching in water bath at 40 ℃ for 2-3 hours, filtering, collecting filtrate, performing centrifugal separation to obtain a wet extract, and drying at 40 ℃ to constant weight to obtain the banana peel extract.
The preparation method of the shaddock peel extract comprises the following steps: drying pericarpium Citri Grandis at 60 deg.C, pulverizing, adding 10-15 times of 1.5mol/L sodium chloride solution, stirring for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, centrifuging to obtain wet extract, and drying at 40 deg.C to constant weight to obtain pericarpium Citri Grandis extract.
The application of the compound plant water purifying agent in water purification comprises the following steps:
firstly, sequentially adding quaternary ammonium salt chitosan, plant extract and polyacrylamide into purified water, stirring and mixing uniformly to obtain a mixture, and then putting the mixture into a water body for water body purification.
Preferably, the mass ratio of the purified water, the quaternary ammonium salt chitosan, the plant extract and the polyacrylamide is (30-80): (2-5): (5-15): (1-3).
The applicant has unexpectedly found in a large number of experiments that the water purifying effect of the water purifying agent of the present invention is optimal under the following specific mass ratio, wherein the mass ratio of the purified water, the quaternary ammonium salt chitosan, the plant extract and the polyacrylamide is 50:3:10:1.
Further preferably, the adding amount of the mixture in the water body is 0.5-1.5g/L.
The invention has the technical effects that:
1. the quaternary ammonium salt chitosan, the plant extract and the polyacrylamide are selected to prepare the compound formula, the using efficiency of the water purifying agent is enhanced through the synergistic effect and the synergistic effect among different components, the solid plant extract not only retains the active ingredients of the plants, but also is not easy to decay and deteriorate, is convenient to transport and store, can realize industrial production and large-scale use, and is particularly suitable for application in feedwater treatment and advanced treatment.
The invention selects plants in nature as main raw materials, the raw materials are cheap and easy to obtain, the preparation process is simple, the invention is safe and nontoxic, the water purification effect is excellent, the invention can replace the conventional aluminum-series and iron-series water purifiers, extracts containing active groups are obtained by respectively adopting different extraction methods for moringa seeds, luan Shuzi, chinese yam, sweet potato, banana peel and shaddock peel, the problem of increase of organic matters in water body caused by directly adding the plants is solved, the bioavailability is high, and the water purification effect is good.
Detailed Description
The invention is further illustrated by the following examples, which should be properly understood: the examples of the present invention are merely illustrative and not restrictive, and therefore, the present invention may be modified in a simple manner without departing from the scope of the invention as claimed.
The quaternary ammonium salt chitosan and the polyacrylamide are all commercially available products, and the moringa seeds, luan Shuzi, chinese yam, sweet potatoes, banana peel and shaddock peel are all obtained from the nature.
In the following examples, various procedures and methods not described in detail are conventional methods well known in the art.
In the following examples, the extracts were prepared as follows:
the preparation method of the moringa seed extract comprises the following steps: drying Moringa seed in the sun, removing shell, pulverizing, adding 10-20 times of distillationWater, stirring thoroughly for 30 min, leaching in 40 deg.C water bath for 4-5 hr, filtering, collecting filtrate, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain Moringa seed extract. />
The preparation method of the Luan Shuzi extract comprises the following steps: luan Shuzi air drying and shelling, pulverizing with a pulverizer, adding 10-20 times of distilled water, stirring for 30 min, leaching in 40 deg.C water bath for 4-5 hr, filtering, collecting filtrate, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain Moringa seed extract. />
The preparation method of the Chinese yam extract comprises the following steps: peeling and cleaning rhizoma Dioscoreae, pulverizing with a pulverizer, adding 3-5 times of distilled water, stirring thoroughly for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, adding 3-5 times of anhydrous ethanol into the filtrate, stirring thoroughly for 30 min, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain rhizoma Dioscoreae extract. />
The preparation method of the sweet potato extract comprises the following steps: peeling and cleaning sweet potato, pulverizing with a pulverizer, adding 3-5 times of distilled water, stirring thoroughly for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, adding 3-5 times of anhydrous ethanol into the filtrate, stirring thoroughly for 30 min, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain sweet potato extract. />
The preparation method of the banana peel extract comprises the following steps: drying banana peel at 60 ℃, grinding the banana peel by a grinder, adding 10-15 times of 1.5mol/L sodium chloride solution, fully stirring for 30 minutes, leaching in water bath at 40 ℃ for 2-3 hours, filtering, collecting filtrate, performing centrifugal separation to obtain a wet extract, and drying the wet extract at 40 ℃ to constant weight to obtain the banana peel extract. />
The preparation method of the shaddock peel extract comprises the following steps: drying pericarpium Citri Grandis at 60 deg.C, pulverizing, adding 10-15 times of 1.5mol/L sodium chloride solution, stirring for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, centrifuging to obtain wet extract, and drying at 40 deg.C to constant weight to obtain pericarpium Citri Grandis extract.
Example 1
30 parts of quaternary ammonium salt chitosan, 20 parts of moringa seed extract, 20 parts of goldenrain seed extract, 15 parts of Chinese yam extract, 15 parts of sweet potato extract, 16 parts of banana peel extract, 16 parts of shaddock peel extract and 10 parts of polyacrylamide. Adding the quaternary ammonium salt chitosan, the moringa seed extract, the goldenrain seed extract, the Chinese yam extract, the sweet potato extract, the banana peel extract, the shaddock peel extract and the polyacrylamide into 500 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture A.
Example 2
25 parts of quaternary ammonium salt chitosan, 18 parts of moringa seed extract, 22 parts of goldenrain seed extract, 13 parts of Chinese yam extract, 18 parts of sweet potato extract, 15 parts of banana peel extract, 20 parts of shaddock peel extract and 8 parts of polyacrylamide. Adding the quaternary ammonium salt chitosan, the moringa seed extract, the goldenrain seed extract, the Chinese yam extract, the sweet potato extract, the banana peel extract, the shaddock peel extract and polyacrylamide into 600 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture B.
Example 3
35 parts of quaternary ammonium salt chitosan, 22 parts of moringa seed extract, 18 parts of goldenrain seed extract, 18 parts of Chinese yam extract, 13 parts of sweet potato extract, 20 parts of banana peel extract, 20 parts of shaddock peel extract and 12 parts of polyacrylamide. Adding the quaternary ammonium salt chitosan, the moringa seed extract, the goldenrain seed extract, the Chinese yam extract, the sweet potato extract, the banana peel extract, the shaddock peel extract and polyacrylamide into 700 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture C.
Example 4
20 parts of quaternary ammonium salt chitosan, 15 parts of moringa seed extract, 25 parts of goldenrain seed extract, 10 parts of Chinese yam extract, 20 parts of sweet potato extract, 10 parts of banana peel extract, 20 parts of shaddock peel extract and 5 parts of polyacrylamide. Adding the quaternary ammonium salt chitosan, the moringa seed extract, the goldenrain seed extract, the Chinese yam extract, the sweet potato extract, the banana peel extract, the shaddock peel extract and polyacrylamide into 300 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture D.
Example 5
40 parts of quaternary ammonium salt chitosan, 25 parts of moringa seed extract, 15 parts of goldenrain seed extract, 20 parts of Chinese yam extract, 10 parts of sweet potato extract, 20 parts of banana peel extract, 10 parts of shaddock peel extract and 15 parts of polyacrylamide. Adding the quaternary ammonium salt chitosan, the moringa seed extract, the goldenrain seed extract, the Chinese yam extract, the sweet potato extract, the banana peel extract, the shaddock peel extract and polyacrylamide into 600 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture E.
Example 6
This example separately examined the effect of the mixtures obtained in examples 1 to 5 and the effect of conventional flocculants commercially available as polyaluminum chloride and polyferric chloride on water purification. The water sample is taken from the water inlet of a tap water plant in a certain city, the using effect of the water purifying agent in the water supply treatment is investigated, and the water quality is as follows: the chroma is 92 times, the turbidity is 510NTU, the COD is 18mg/L, and the adding amount of the mixture is 0.5g/L. The purification effect is shown in table one.
Table-the effect of the water purifying agent of the present invention in the treatment of feedwater
As can be seen from the first table, the water purifying agent has excellent effects of removing chromaticity, turbidity and COD of the inlet water of tap water, and is superior to polyaluminium chloride and polymeric ferric chloride, wherein the best effect is shown in example 1, the water quality index after being purified by the water purifying agent is superior to the water quality standard of GB5749-2006 domestic drinking water, and the water quality index after being treated by the polyaluminium chloride and the polymeric ferric chloride can not meet the water quality standard of GB5749-2006 drinking water.
Example 7
This example separately examined the effect of the mixtures obtained in examples 1 to 5 and the effect of conventional flocculants commercially available as polyaluminum chloride and polyferric chloride on water purification. Water samples are respectively taken from secondary biochemical water outlets of certain municipal sewage treatment plants, and the use effect of the water purifying agent in advanced treatment is investigated. Wherein, the water quality of the secondary biochemical water outlet of the municipal sewage treatment plant is as follows: 108mg/L suspended matter, 34mg/L, COD mg/L ammonia nitrogen and 1.5g/L mixture adding amount. The purification effect is shown in table two.
TABLE II Effect of the Water purifying agent of the present invention in advanced treatment
As can be seen from the table II, the water purifying agent has excellent removal effects on suspended matters, ammonia nitrogen and COD of the secondary biochemical effluent of municipal sewage, and are all superior to polyaluminium chloride and polymeric ferric chloride, wherein the best effect is obtained in the example 1, the water quality index after advanced treatment by the water purifying agent is superior to the GB18918-2002 primary A discharge standard, and the water quality index after treatment by the polyaluminium chloride and the polymeric ferric chloride cannot meet the GB18918-2002 primary A discharge standard.
Comparative example 1
20 parts of moringa seed extract, 20 parts of goldenrain seed extract, 15 parts of Chinese yam extract, 15 parts of sweet potato extract, 16 parts of banana peel extract, 16 parts of shaddock peel extract and 10 parts of polyacrylamide. Adding the moringa seed extract, the goldenrain seed extract, the Chinese yam extract, the sweet potato extract, the banana peel extract, the shaddock peel extract and polyacrylamide into 500 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture H.
Comparative example 2
30 parts of quaternary ammonium salt chitosan, 20 parts of moringa seed extract, 20 parts of goldenrain seed extract, 15 parts of Chinese yam extract, 15 parts of sweet potato extract, 16 parts of banana peel extract and 16 parts of shaddock peel extract. Adding the quaternary ammonium salt chitosan, the moringa seed extract, the goldenrain seed extract, the Chinese yam extract, the sweet potato extract, the banana peel extract and the shaddock peel extract into 500 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture I.
Comparative example 3
30 parts of quaternary ammonium salt chitosan, 15 parts of Chinese yam extract, 15 parts of sweet potato extract, 16 parts of banana peel extract, 16 parts of shaddock peel extract and 10 parts of polyacrylamide. Adding the quaternary ammonium salt chitosan, the yam extract, the sweet potato extract, the banana peel extract, the shaddock peel extract and the polyacrylamide into 500 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture J.
Comparative example 4
30 parts of quaternary ammonium salt chitosan, 20 parts of moringa seed extract, 20 parts of goldenrain seed extract, 16 parts of banana peel extract, 16 parts of shaddock peel extract and 10 parts of polyacrylamide. And (3) sequentially adding the quaternary ammonium salt chitosan, the moringa seed extract, the goldenrain seed extract, the banana peel extract, the shaddock peel extract and polyacrylamide into 500 parts of purified water, and stirring and uniformly mixing to obtain a mixture K.
Comparative example 5
30 parts of quaternary ammonium salt chitosan, 20 parts of moringa seed extract, 20 parts of goldenrain seed extract, 15 parts of Chinese yam extract, 15 parts of sweet potato extract and 10 parts of polyacrylamide. Adding the quaternary ammonium salt chitosan, the moringa seed extract, the goldenrain seed extract, the Chinese yam extract, the sweet potato extract and the polyacrylamide into 500 parts of purified water in sequence, and stirring and mixing uniformly to obtain a mixture L.
Verification example 1
In order to verify the effect of the technical scheme of the invention, the use effect of the embodiments in the water supply treatment is examined, a water sample is taken from a water inlet of a tap water plant in a certain city, and the water quality is as follows: the chroma is 92 times, the turbidity is 510NTU, the COD is 18mg/L, and the adding amount of the mixture is 0.5g/L. The purification effect is shown in table three.
Comparison of use effects of water purifying agents in feedwater treatment
From the third table, the removal effect of the water purifying agent on the inflow water of tap water is obviously reduced after the formula of the water purifying agent is deleted, which shows that the water purifying agent prepared by mixing quaternary ammonium salt chitosan, moringa seed extract, goldenrain tree seed extract, chinese yam extract, sweet potato extract, banana peel extract, shaddock peel extract and polyacrylamide according to a certain proportion has synergistic and synergistic effects, and the good water purifying effect can be achieved only by using the water purifying agent at the same time.
Verification example 2
In order to verify the effect of the technical scheme of the invention, the use effect of each embodiment in advanced treatment is considered, a water sample is taken from secondary biochemical effluent of a certain municipal sewage treatment plant, and the water quality is as follows: 108mg/L suspended matter, 34mg/L, COD mg/L ammonia nitrogen and 1.5g/L mixture adding amount. The purification effect is shown in table three.
Comparison of use effects of water purifying agents in advanced treatment
As can be seen from the table four, after the formula of the water purifying agent disclosed by the invention is deleted, the removal effect on the municipal wastewater secondary biochemical effluent is obviously reduced, so that the water purifying agent prepared by mixing quaternary ammonium salt chitosan, moringa seed extract, goldenrain tree seed extract, chinese yam extract, sweet potato extract, banana peel extract, shaddock peel extract and polyacrylamide in a certain proportion has a synergistic effect, and a good deep treatment effect can be achieved only by using the water purifying agent at the same time.
Claims (13)
1. The compound plant water purifying agent is characterized by comprising the following components: quaternary ammonium salt chitosan, plant extract and polyacrylamide.
2. The water purifying agent of claim 1, wherein the plant extract is moringa seed extract, goldenrain seed extract, yam extract, sweet potato extract, banana peel extract, grapefruit peel extract.
3. The water purifying agent of claim 1, wherein said water purifying agent consists of: 20-40 parts of quaternary ammonium salt chitosan, 15-25 parts of moringa seed extract, 15-25 parts of goldenrain seed extract, 10-20 parts of Chinese yam extract, 10-20 parts of sweet potato extract, 10-20 parts of banana peel extract, 10-20 parts of shaddock peel extract and 5-15 parts of polyacrylamide, wherein the water purifying agent preferably comprises the following components in parts by weight: 25-35 parts of quaternary ammonium salt chitosan, 18-22 parts of moringa seed extract, 18-22 parts of goldenrain seed extract, 13-18 parts of Chinese yam extract, 13-18 parts of sweet potato extract, 15-20 parts of banana peel extract, 15-20 parts of shaddock peel extract and 8-12 parts of polyacrylamide, wherein the most preferable water purifying agent comprises the following components in parts by weight: 30 parts of quaternary ammonium salt chitosan, 20 parts of moringa seed extract, 20 parts of goldenrain seed extract, 15 parts of Chinese yam extract, 15 parts of sweet potato extract, 16 parts of banana peel extract, 16 parts of shaddock peel extract and 10 parts of polyacrylamide.
4. The water purifying agent of claim 2, wherein the moringa seed extract is prepared by the following steps: sun-drying and shelling Moringa seed, pulverizing with a pulverizer, adding 10-20 times of distilled water, stirring for 30 min, leaching in 40 deg.C water bath for 4-5 hr, filtering, collecting filtrate, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain Moringa seed extract.
5. The water purifying agent of claim 1, wherein the Luan Shuzi extract is prepared by the method comprising: luan Shuzi air drying, removing shell, pulverizing, adding 10-20 times of distilled water, stirring for 30 min, leaching in 40 deg.C water bath for 4-5 hr, filtering, collecting filtrate, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain Moringa seed extract.
6. The water purifying agent of claim 1, wherein the yam extract is prepared by the following steps: peeling and cleaning rhizoma Dioscoreae, pulverizing with a pulverizer, adding 3-5 times of distilled water, stirring thoroughly for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, adding 3-5 times of anhydrous ethanol into the filtrate, stirring thoroughly for 30 min, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain rhizoma Dioscoreae extract.
7. The water purifying agent of claim 1, wherein the sweet potato extract is prepared by the following steps: peeling and cleaning sweet potato, pulverizing with a pulverizer, adding 3-5 times of distilled water, stirring thoroughly for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, adding 3-5 times of anhydrous ethanol into the filtrate, stirring thoroughly for 30 min, centrifuging to obtain wet extract, and oven drying at 40 deg.C to constant weight to obtain sweet potato extract.
8. The water purifying agent according to claim 1, wherein the banana peel extract is prepared by the following steps: drying banana peel at 60 ℃, crushing by a crusher, adding 10-15 times of 1.5mol/L sodium chloride solution, fully stirring for 30 minutes, leaching in water bath at 40 ℃ for 2-3 hours, filtering, collecting filtrate, performing centrifugal separation to obtain a wet extract, and drying at 40 ℃ to constant weight to obtain the banana peel extract.
9. The water purifying agent of claim 1, wherein the preparation method of the shaddock peel extract comprises: drying pericarpium Citri Grandis at 60 deg.C, pulverizing, adding 10-15 times of 1.5mol/L sodium chloride solution, stirring for 30 min, leaching in 40 deg.C water bath for 2-3 hr, filtering, collecting filtrate, centrifuging to obtain wet extract, and drying at 40 deg.C to constant weight to obtain pericarpium Citri Grandis extract.
10. The use of the water purifying agent of any one of claims 1 to 8 in the purification of a body of water, wherein the method of use is as follows: sequentially adding quaternary ammonium salt chitosan, plant extracts and polyacrylamide into purified water, stirring and mixing uniformly to obtain a mixture, and putting the mixture into a water body for water body purification.
11. The use of the water purifying agent in water purification according to claim 9, wherein the mass ratio of the purified water, the quaternary ammonium salt chitosan, the plant extract and the polyacrylamide is (30-80): (2-5): (5-15): (1-3).
12. The use of the water purifying agent of claim 10 in water purification, wherein the mass ratio of the purified water, quaternary ammonium salt chitosan, plant extract and polyacrylamide is 50:3:10:1.
13. The use of the water purifying agent of claim 11 for the purification of a body of water, wherein the amount of said mixture added to the body of water is from 0.5 to 1.5g/L.
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