NL2032239B1 - Sewage treatment system based on myriophyllum elatinoides gaudich biological oxidation pond and method thereof - Google Patents

Abstract

A sewage treatment system based on a myriophyllum elatinoides gaudich biological oxidation pond and method thereof, including an anaerobic acidification regulating pond, a high—efficiency myriophyllum elatinoides gaudich biological oxidation pond and a myriophyllum elatinoides gaudich aguatic biological pond, bring sewage into the anaerobic sedimentation section of the anaerobic acidification regulating pond; then enter the acidification adjustment section through the water outlet and the flow hole, macromolecular substances such as protein and fat is hydrolyzed and acidified into small molecular substances through the high— efficiency anaerobic biological filler, and complete the pretreatment of sewage; then, the pretreated sewage enters into the high—efficiency myriophyllum elatinoides gaudich biological oxidation pond, and the continuous stirring aerator promotes the complete mixing of the sewage; finally, enters into the green foxtail algae aguatic biological pond, and release a large amount of oxygen into the myriophyllum elatinoides gaudich aquatic biological pond through photosynthesis to purify water.

Description

P1402 /NL

SEWAGE TREATMENT SYSTEM BASED ON MYRIOPHYLLUM ELATINOIDES GAUDICH

BIOLOGICAL OXIDATION POND AND METHOD THEREOF

TECHNICAL FIELD

The present disclosure belongs to the technical field of sew- age treatment, and specifically relates to a sewage treatment sys- tem based on a myriophyllum elatinoides gaudich biological oxida- tion pond and method thereof.

BACKGROUND ART

In prior art, in the control and treatment of agricultural source pollution, a stabilization pond treatment system is gener- ally used, and the stabilization ponds commonly used are divided into the following four types.

First, aerobic pond. The aerobic pond decomposes organic mat- ter by aerobic bacteria, and the decomposed products are used by algae, and the algae then release oxygen through photosynthesis and are absorbed by aerobic bacteria to purify the sewage. The ad- vantages of aerobic ponds are shallow, high dissolved oxygen, bet- ter treatment effect, and relatively simple management. The disad- vantage of the aerobic pond is having a large area, occupying a lot of land and having a high algae content.

Second, anaerobic pond. The anaerobic pond is often used to treat high-concentration organic wastewater. The water depth of the anaerobic pond is more than 2m, the organic load is high, and all the pond water is in an anaerobic state, the anaerobic pond is purified by anaerobic microorganisms, and the purification speed is slow. The advantages of the oxygen pond are strong impact load resistance, less land occupation and can degrade some organic sub- stances that are difficult to be degraded by aerobic. The disad- vantage of anaerobic pond is requiring high humidity.

Third, facultative pond. An upper layer of the facultative pond is an aerobic zone, a lower layer is an anaerobic zone, and a facultative zone is between the aerobic zone and the anaerobic zone. The sewage is purified by the combined action of bacteria in the aerobic zone, the facultative zone and the anaerobic zone. The advantages of facultative pond are less capital investment, lower operating costs, and different parts of the pond play different roles. The disadvantages of facultative pond are large area, large land occupation and unstable effluent quality.

Fourth, aeration pond. The aeration pond is a stable pond with artificial aeration device installed on the pond surface. The advantages of aeration pond are small size, less land occupation, large receiving capacity for influent water quality and high de- gree of treatment. The disadvantages are high operating cost and high solid content in effluent.

Although these four types of stabilization ponds can remove organic matter and nutrients, the overall treatment efficiency is not high, and they cannot be used as a separate process to treat sewage to meet the discharge standards. Moreover, in the design and engineering practice of the previous stabilization pond sys- tem, most of the attention was paid to the pond type, pond depth and construction. Less consideration is given to constructing eco- logical approaches to sewage treatment that utilize the material cycle and energy flow of both plants and microorganisms. In order to solve the problems mentioned above, a sewage treatment system based on a myriophyllum elatinoides gaudich biological oxidation pond and method thereof are provided.

SUMMARY

The present disclosure aims to provide a sewage treatment system based on a myriophyllum elatinoides gaudich biological oxi- dation pond and method thereof.

The object of the present disclosure can be achieved through the following technical solutions: a sewage treatment system based on a myriophyllum elatinoides gaudich biological oxidation pond, including an anaerobic acidification regulating pond, a high- efficiency myriophyllum elatinoides gaudich biological oxidation pond and a myriophyllum elatinoides gaudich aquatic biological pond.

The anaerobic acidification regulating pond is composed of an anaerobic sedimentation section and an acidification regulating section, an upper portion of a front wall of the anaerobic sedi- mentation section is provided with a first water inlet pipe; a first deflector is arranged in the anaerobic sedimentation sec- tion, an upper portion of the rear wall of the anaerobic sedimen- tation is respectively provided with a water outlet trough and a flow hole, the acidification regulating section is provided with a high-efficiency anaerobic biological filler, and a second water outlet pipe is arranged on an upper portion of a rear wall of the acidification regulating section.

An upper portion of a front wall of the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond is pro- vided with a second water inlet pipe, the second water inlet pipe is connected to the first water outlet pipe, a set of continuous stirring aerator is arranged at a front end of the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond, a sec- ond deflector is arranged in the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond, and an arc-shaped guide wall is arranged in the high-efficiency myriophyllum elati- noides gaudich biological oxidation pond; a submerged ecological floating bed is provided at a distance of 20 cm below the water surface, and the submerged ecological floating bed is fixed under- water by a floating body, a fixed rod and a fixed plate, the high- efficiency myriophyllum elatinoides gaudich biological oxidation pond is respectively provided with an outlet channel and a second outlet pipe.

One side of the green foxtail algae aquatic biological pond is provided with a third water inlet pipe, and the third water in- let pipe is connected with the second water outlet pipe, and the third water inlet pipe is connected with the second water outlet pipe; the myriophyllum elatinoides gaudich aguatic biological pond is provided with a third water inlet pipe on one side, and a third water outlet pipe is provided on one end away from the third water inlet pipe.

Further, the anaerobic sedimentation section is cone-shaped with a sludge bucket at a bottom, and a side length of the bottom of the sludge bucket is 0.5m, and an inclination angle of the sludge bucket is 55°.

Further, the high-efficiency anaerobic biological filler (121) is a hydrophilic polypropylene fiber horizontally, and is vertically connected by a strong central rope, fiber filaments are arranged on the center rope every 100mm in the horizontal direc- tion, and the upper and lower fiber filaments are deflected at an angle of 45° to form three-dimensionally distributed in space.

Further, the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond is a runway shape, and a water depth of the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond is 2m.

Further, a water depth of the myriophyllum elatinoides gau- dich aquatic biological pond is 1.5m.

Further, the continuous stirring aerator is composed of a mo- tor, a two-way lcad-bearing transmission shaft and a pump-suction composite impeller, and is vertically installed in the high- efficiency myriophyllum elatinoides gaudich biological oxidation pond.

A sewage treatment method based on myriophyllum elatinoides gaudich biological oxidation pond, including the follow steps.

Step 1: domestic sewage or free-range livestock and poultry sewage entering into the anaerobic sedimentation section of the anaerobic acidification regulating pond.

Step 2: entering the acidification adjustment section through the water outlet pond and the flow hole, the high-efficiency an- aerobic biological filler hydrolyzing and acidifying macromolecu- lar substances into small molecular substances, and completing the pretreatment of sewage.

Step 3: the pretreated sewage entering the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond through the first water outlet pipe and the second water inlet pipe, and the continuous stirring aerator promoting the complete mixing of the sewage.

Step 4: the third water inlet pipe connected with the third water outlet pipe entering the green foxtail algae aquatic biolog- ical pond, and releasing a large amount of oxygen into the myriophyllum elatinoides gaudich aquatic biological pond through photosynthesis to purify water.

The beneficial effects of the present disclosure is adopting ecological purification of water quality, which is a natural and harmonious way. The principle is to use the roots and stems of aquatic plants to precipitate organic matter and nitrogen and 5 phosphorus nutrients in sewage, and adsorb them in the body of the aquatic plants. At the same time, it also uses the biofilm pro- duced around the rhizomes of aquatic plants and the organic matter produced at the interface of the sediment to precipitation, fil- tration, adsorption, decomposition, adsorption, nitrification, de- nitrification and other functions of nitrogen and phosphorus nu- trients to achieve the purpose of purifying sewage.

BRIEF DESCRIPTION OF THE DRAWINGS

To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings required for describ- ing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying draw- ings without creative efforts.

FIG. 1 is an overall diagram of a sewage treatment system based on a myriophyllum elatinoides gaudich biological oxidation pond.

FIG. 2 is a schematic diagram of an anaerobic acidification regulating pond of the sewage treatment system based on the myriophyllum elatinoides gaudich biological oxidation pond.

FIG. 3 is a schematic diagram of an anaerobic sedimentation section of the sewage treatment system based on the myriophyllum elatinoides gaudich biological oxidation pond.

FIG. 4 is a schematic diagram of a high-efficiency myriophyl- lum elatinoides gaudich biological oxidation pond of the sewage treatment system based on the myriophyllum elatinoides gaudich bi- ological oxidation pond.

The reference numbers in the drawings are as follows: 1. an- aerobic acidification regulating pond; 11. anaerobic sedimentation section; 111. first water inlet pipe; 112, first deflector; 113.

water outlet trough; 114. flow hole; 12. acidification regulating section; 121. high-efficiency anaerobic biological filler; 122. first outlet pipe; 2. high-efficiency myriophyllum elatinoides gaudich biological oxidation pond; 21. second water inlet pipe; 22. continuous stirring aerator; 23. second deflector; 24. arc- shaped guide wall; 25. submerged ecological floating bed; 251. floating body; 252. fixed rod; 253. fixed plate; 26. outlet chan- nel; 27. second outlet pipe; 3. myriophyllum elatinoides gaudich aquatic biological pond; 31. third inlet pipe; 32. third outlet pipe.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Referring to FIGS. 1 to 4, a sewage treatment system based on a myriophyllum elatinoides gaudich biological oxidation pond, in- cluding an anaercbic acidification regulating pond 1, a high- efficiency myriophyllum elatinoides gaudich biological oxidation pond 2, and a myriophyllum elatinoides gaudich aquatic biological pond 3.

The anaerobic acidification regulating pond 1 is composed of an anaerobic sedimentation section 11 and an acidification regu- lating section 12. The anaerobic sedimentation section 11 is cone- shaped with a sludge bucket at a bottom, and a side length of the bottom of the sludge bucket is 0.5m, and an inclination angle of the sludge bucket is 55°. An upper portion of a front wall of the anaerobic sedimentation section 11 is provided with a first water inlet pipe, and a first deflector 112 is arranged at 1/3 of a rear wall of the anaerobic sedimentation section 11. An upper portion of the rear wall of the anaerobic sedimentation 11 is respectively provided with a water outlet trough 113 and a flow hole 114. The acidification regulating section 12 is provided with a high- efficiency anaerobic biological filler 121, the high-efficiency anaerobic biological filler 121 is a hydrophilic polypropylene fi- ber horizontally, and is vertically connected by a strong central rope. Fiber filaments are arranged on the center rope every 100mm in the horizontal direction, and the upper and lower fiber fila- ments are deflected at an angle of 45°, which is three- dimensionally distributed in space. A second water outlet pipe 27 is arranged on an upper portion of a rear wall of the acidifica- tion regulating section 12.

In a specific use process, the anaerobic sedimentation sec- tion 11 can separate the inorganic suspended solids and organic suspended solids in the sewage, and carry out anaerobic sedimenta- tion and corrosion on the sewage. The Acidification regulating section 12 can hydrolyze and acidify macromolecular substances such as proteins and fats into small molecular substances such as organic acids. The anaerobic acidification regulating pond 1 plays the role of equalizing the water quantity and quality, and prepro- cessing the sewage.

The high-efficiency myriophyllum elatinoides gaudich biologi- cal oxidation pond 2 is a runway shape, and the water depth of the pond is 2m. An upper portion of a front wall of the pond is pro- vided with a second water inlet pipe 21. The second water inlet pipe 21 is connected to the first water outlet pipe 122. A set of vertical continuous stirring aerator 22 is arranged at a front end of the pond, and the continuous stirring aerator 22 is composed of a motor, a two-way load-bearing transmission shaft and a pump- suction composite impeller. The high-efficiency myriophyllum elat- inoides gaudich biological oxidation pond 2 is provided with a second deflector 23, and the high-efficiency myriophyllum elati- noides gaudich biological oxidation pond 2 is also provided with an arc-shaped guide wall 24. A submerged ecological floating bed 25 is provided at a distance of 20 cm below the water surface, and the submerged ecological floating bed 25 is fixed underwater by a floating body 251 , a fixed rod 252 and a fixed plate 253. The high-efficiency myriophyllum elatinoides gaudich biological oxida- tion pond 2 is respectively provided with an outlet channel 26 and a second outlet pipe 27.

In an actual use process, the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond 2 can play a major role in removing organic pollutants, ammonia nitrogen and phospho- rus, So as to realize the secondary treatment of sewage.

The water depth of the myriophyllum elatinoides gaudich aquatic biological pond 3 is 1.5m, and one side of the myriophyl- lum elatinoides gaudich aquatic biological pond 3 is provided with a third water inlet pipe 31, the third water inlet pipe 31 is con- nected to the second water outlet pipe 27. The end of the myriophyllum elatinoides gaudich aquatic biological pond 3 away from the third water inlet pipe 31 is provided with a third water outlet pipe 32.

In a specific implementation process, the bottom of the myriophyllum elatinoides gaudich aquatic biological pond 3 is pro- vided with a subsoil layer composed of organic clay such as field soil and pond mud, and the thickness of the subsoil layer is 200mm. A biofilm building layer is on the subsoil layer (the bio- film construction layer is made of quartz sand with a particle size of 0.6 to 1.2 mm and a thickness of 100 mm.) an emergent plant belt (the emergent plant is arundo donax var. versicolor) is provided in a shallow water area of the myriophyllum elatinoides gaudich aquatic biological pond 3. A deeper water area is provided with a floating water plant belt (the floating water plant is nym- phaea lotus var. pubescens). A pond bottom submerged plant belt (the submerged plant is myriophyllum elatinoides gaudich) is at the bottom of the pond. Fish can be stocked in the myriophyllum elatinoides gaudich aquatic biological pond 3.

The myriophyllum elatinoides gaudich aquatic biological pond 3 can further remove organic pollutants, ammonia nitrogen and phosphorus, so as to carry out advanced treatment of sewage and three-dimensional cultivation.

A sewage treatment method based on myriophyllum elatinoides gaudich biological oxidation pond, specifically includes: rural domestic sewage or free-range livestock and poultry sewage enter- ing the anaerobic sedimentation section 11 of the anaerobic acidi- fication regulating pond 1 through the first water inlet pipe 111, separating inorganic suspended solids and organic suspended solids in the sewage and performing anaerobic sedimentation and corrosion on the sewage; entering the Acidification regulating section 12 through the water outlet trough 113 and the flow hole 114, the high-efficiency anaerobic biological fillers 121 arranged in the

Acidification regulating section 12, and the fillers composed of hydrophilic propylene fibers with a rough surface and easy to at- tach microorganisms. At the same time, due to the combined action of the sludge attached to the filler and the floating activated sludge, the macromolecular substances such as proteins and fats are hydrolyzed and acidified into small molecular substances such as organic acids, which are suitable for subsequent treatment. The residence time of the anaerobic acidification regulating pond 1 is 16 hours.

The sewage after pretreatment in the anaerobic acidification regulating pond 1 enters the high-efficiency myriophyllum elati- noides gaudich biological oxidation pond 2 through the first water outlet pipe 122 and the second water inlet pipe 21. Because a set of vertical continuous stirring aerator 22 is in the high- efficiency myriophyllum elatinoides gaudich biological oxidation pond 2, the continuous stirring aerator 22 in the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond 2 can promote the complete mixing of sewage, adjust the oxygen and car- bon dioxide concentrations in the pond, balance the water tempera- ture in the pond and promote the stripping effect of ammonia ni- trogen. The residence time of the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond 2 is 12 days. The characteristics mentioned above make the environment favorable for the growth of the myriophyllum elatinoides gaudich grown on the submerged ecological floating bed 25 in the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond 2. Ab- sorption of organic pollutants through the roots, stems and leaves of myriophyllum elatinoides gaudich: nitrogen, phosphorus and mi- croorganisms attached to the surface of roots, stems and leaves transform organic pollutants nitrogen and phosphorus. The myriophyllum elatinoides gaudich has a huge specific surface area due to the special structure of myriophyllum elatinoides gaudich with filamentous below the water surface and feathery above the water surface, and can adsorb and convert the organic pollutants, nitrogen and phosphorus in the sewage to the maximum amount. The high-efficiency myriophyllum elatinoides gaudich biological oxida- tion pond 2 plays a major role in removing organic pollutants, ni- trogen and phosphorus.

The sewage after the organic pollutants, nitrogen and phos- phorus are mainly removed by the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond 2 enters the myriophyllum elatinoides gaudich aquatic biological pond through the the third water outlet pipe 32 and the third water inlet pipe 31 connected with the third water outlet pipe 32. Since there are emergent plant belts in the shallow water area of the pond (the emergent plant is arundo donax var. versicolor) and floating water plant belts (the floating water plant is nymphaea lotus var. pu- bescens) in the deeper water area, and absorb organic pollutants, nitrogen and phosphorus in sewage through roots, stems and leaves respectively, and fix them in the body. The submerged plant belt at the bottom of the full pond (the submerged plant is the myriophyllum elatinoides gaudich) releases a large amount of oxy- gen into the pond through photosynthesis, which is conducive to maintaining a high dissolved oxygen content in the pond, thereby purifying the water quality. In addition, there are fish in the pond, and the residence time of the myriophyllum elatinoides gau- dich aquatic biological pond 3 is 10 days. The myriophyllum elati- noides gaudich aquatic biological pond 3 uses planted aquatic plants and fish to form a food chain. Among them, there are not only decomposer organisms i.e. bacteria and fungi, producer organ- isms i.e. algae and other aquatic plants, and consumer organisms i.e. fish. The decomposer biology, the producer biology and the consumer biology are division cooperation to further treat the or- ganic pollutants, nitrogen and phosphorus in the sewage more ef- fectively, that is, the tertiary biological advanced treatment and three-dimensional planting and breeding.

The foregoing contents are merely embodiments and description of the structure of this application, and a person skilled in the art can make various modifications or supplements to the specific embodiments described or replace them in similar ways, as long as they do not deviate from the structure of the invention or go be- yond the scope defined by the claims shall belong to the protec- tion scope of the present disclosure. In addition, the terms “first” and “second” are merely intended for a purpose of descrip- tion, and shall not be understood as an indication or implication of relative importance or implicit indication of the number of in- dicated technical features. Therefore, a feature limited by

“first” or “second” may explicitly or implicitly include one or more features. In the description of the present disclosure, "plu- rality" means at least two, such as two, three, etc., unless oth- erwise expressly and specifically defined. In the embodiments pro- vided by the present disclosure, it should be understood that the disclosed devices, apparatus and method may be implemented in oth- er manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the modules is only a logical function division, and other division methods may be used in actual implementation. The modules described as sepa- rate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the method in this embodiments.

Also, it is apparent to a person skilled in the art that the present disclosure is not limited to the details of the exemplary embodiments mentioned above, but that the present disclosure may be embodied in other specific forms without departing from the spirit or essential characteristics of the present disclosure.

Accordingly, the embodiments should be considered in all re- spects to be exemplary and non-restrictive, the scope of the in- vention is defined by the appended claims rather than the descrip- tion mentioned above, and therefore all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein. Any reference signs in the claims shall not be construed as limiting the claim related.

Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. A plurality of units or apparatus recited in the sys- tem claims can also be implemented by one unit or apparatus by means of software or hardware.

Finally, it should be noted that the embodiments metioned above are only used to illustrate the technical method of the pre- sent disclosure and not to limit the present disclosure, although the present disclosure has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical method of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present dis- closure.

Claims (9)

CONCLUSIONS A sewage treatment system based on a biological oxidation pond of Myriophyllum elatinoides gaudich, comprising: a biological oxidation pond of Myriophyllum elatinoides gaudich (1), wherein the biological oxidation pond of Myriophyllum elatinoides gaudich (1) is composed of an anaerobic sedimentation section ( 11) and an acidification regulating section (12), using the anaerobic sedimentation section (11) to separate the inorganic suspended solids and organic suspended solids in the sewage and perform anaerobic sedimentation and corrosion on the sewage, the acidification regulating section (12) is used for hydrolyzing and acidifying macromolecular substances such as proteins and fats into small molecular substances, and pre-treating the sewage by the cooperation of the anaerobic sedimentation section (11) and the acidification regulating section (12); wherein an upper part of a front wall of the high efficiency myriophyllum elatinoides gaudich biological oxidation pond (2) is provided with a second water supply line (21) and a set of continuously agitating aerators (22), with a second deflector (23) arranged in the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond (2), and an arc-shaped guide wall {24) is provided in the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond; wherein the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond (2) is used to remove organic pollutants, ammonia nitrogen and phosphorus and to perform secondary treatment of waste water; wherein the myriophyllum elatinoides gaudich aquatic biological pond (3) is provided with a third water inlet pipe (31) on one side, and wherein a third water outlet pipe (32) is provided at one end away from the third water inlet pipe (31), wherein the myriophyllum elatinoides gaudich aquatic biological pond (3) is used for further removal of organic pollutants, ammonia nitrogen and phosphorus, and for performing advanced wastewater treatment and three-dimensional cultivation. The sewage treatment system based on a biological oxidation pond of myriophyllum elatinoides gaudich according to claim 1, wherein the anaerobic sedimentation section (11) is conical with a sludge tank at the bottom and a side length of the bottom of the sludge tank is 0.5 m and the angle of inclination of the sludge tank is 55°. The sewage treatment system based on a biological oxidation pond of myriophyllum elatinoides gaudich according to claim 1, wherein the high-efficiency anaerobic biological filler (121) is horizontally a hydrophilic polypropylene fiber and is connected vertically by a strong central rope, with fiber filaments every 100 mm in are arranged in the horizontal direction on the middle rope, and the upper and lower fiber filaments are deflected at an angle of 45° to form a three-dimensional distribution in space. The sewage treatment system based on a myriophyllum elatinoides gaudich biological oxidation pond according to claim 1, wherein the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond (2) has a web shape, and wherein a water depth of the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond ( 2) is 2m. The sewage treatment system based on a biological oxidation pond of Myriophyllum elatinoides gaudich according to claim 1, wherein a water depth of the biological water pond of Myriophyllum elatinoides gaudich (3) is 1.5 m. The sewage treatment system based on a biological oxidation pond of myriophyllum elatinoides gaudich according to claim 1, wherein the continuously agitating aerator (22) is composed of a motor, a two-way bearing transmission shaft and a pump-suction composite impeller, and vertically has been installed in the high-efficiency myriophyllum elatinoides gaudich biological oxi- dating pond (2). The sewage treatment system based on a biological oxidation pond of myriophyllum elatinoides gaudich according to claim 1, wherein an upper portion of a front wall of the anaerobic sedimentation section (11) is provided with a first water inlet conduit, the first deflector (112) being in the anaerobic sedimentation section (11), an upper portion of the rear wall of the anaerobic sedimentation section (11) is provided with a water drain pan (113) and a flow hole (114), respectively, with a high-efficiency anaerobic biological filler (121 ) is provided in the acidification control section (12), and a second water discharge pipe (27) is provided on an upper portion of a rear wall of the acidification control section (12). The sewage treatment system based on a biological oxidation pond of myriophyllum elatinoides gaudich according to claim 1, wherein the second water inlet conduit (21) is connected to the first water outlet conduit (122), with a submerged ecological floating bed (25) disposed at a distance of 20 cm below the water surface, and the submerged ecological floating bed (25) is fixed underwater by a floating body (251), a fixed rod (252) and a fixed plate (253), where the highly efficient myriophyllum elatinoides gaudich biological oxidation pond ( 2) is respectively provided with an exhaust duct (26) and a second exhaust pipe (27). 9. Method for treating sewage based on Myriophyllum elatinoides gaudich biological oxidation pond, comprising the following steps: step 1: household wastewater or wastewater from free-range animals and poultry entering the anaerobic sedimentation section (11) of the anaerobic acidification control pond (1 ); step 2: entering the acidification regulating section (12) through the water outlet pond (113) and the flow hole (114), the high-efficiency anaerobic biological filler (121) for the hy- drolysing and acidifying macromolecular substances into small molecular substances, and completing the pre-treatment of the sewage water; step 3: the pre-treated sewage entering the high-efficiency myriophyllum elatinoides gaudich biological oxidation pond (2) through the first water outlet line (122) and the second water inlet line (21) and the continuously agitating aerator (22) providing complete mixing of the waste water; step 4: the third water inlet pipe (31) connected to the third water outlet pipe (32) which enters the aquatic biological pond (3) of green foxtail algae and releases a large amount of oxygen to the myriophyllum elatinoides gaudich aquatic biological pond (3) through photosynthesis to make water to purify.