CN219279694U - Breeding wastewater treatment system - Google Patents

Abstract

The utility model discloses a cultivation wastewater treatment system, which comprises a biological matrix purifying tank and an ecological wetland, wherein the biological matrix purifying tank is connected to the ecological wetland through a pipeline and is used for enabling cultivation wastewater treated by the biological matrix purifying tank to enter the ecological wetland through the pipeline; the ecological wetland is an open square pool, aquatic plants are planted in the pool, clay is adopted to tamp the bottom of the pool, and an impermeable geomembrane is paved; the ecological wetland comprises multistage ecological wetlands which are sequentially connected, the multistage ecological wetlands are arranged in a stepwise gradually descending mode, the water level of the upper-stage ecological wetland is higher than that of the lower-stage ecological wetland according to a preset height difference value, and the effluent of the upper-stage ecological wetland enters the lower-stage ecological wetland. By adopting the cultivation wastewater treatment system, ecological environment treatment and planting can be organically combined, and the cultivation environment pollution treatment problem of cultivation wastes is fundamentally solved.

Description

Breeding wastewater treatment system

Technical Field

The utility model relates to an automatic livestock breeding technology, in particular to an environment-friendly technology in the pig breeding process.

Background

The wastewater which is not treated is discharged into rivers, lakes, paddy fields and the like to cause serious hypoxia (DO) and algae flooding of the water body, so that the water quality is further deteriorated. For example, one pig excretes about 2.2 tons of manure per year, and currently most pig farms use water-soaked manure, with about 30 kg/day of wastewater per pig per day, about 11 tons per year, and 10 ten thousand tons per 10000 years of wastewater per 10000 columns. Generally, the COD (chemical oxygen demand) of the water-soaked manure (15600-46800 mg/L) is 21600mg/L, NH on average ₃ -N (127-1780 mg/L) average 590mg/L, TN (141-1970 mg/L) average 805mg/L and TP (32.1-293 mg/L) average 127mg/L; therefore, the livestock and poultry breeding wastewater mainly contains organic pollutants such as nitrogen, phosphorus and the like; meanwhile, a large amount of fecaluria is accumulated, so that a large amount of pathogens and parasitic ova are bred to seriously threaten the health of a human body.

For realizing effective treatment of livestock and poultry raising wastewater and realizing high-quality pollution discharge management, a series of pollution discharge technical specifications are formulated in China, for example, the environmental protection agency in 2010 promulgates pollution control technical policy for livestock and poultry raising industry (the number of the environmental protection agency in 2010 is the specification of livestock and poultry raising pollution control content, and guidance is provided for livestock and poultry raising wastewater treatment. Meanwhile, the preparation of technical specifications for pollution control engineering of livestock and poultry farming (HJ 497-2009) and emission standards for pollutants of livestock and poultry farming (GB 18596-2001) provides substantial requirements for livestock and poultry farming wastewater emission and treatment work.

In the prior art, the livestock and poultry breeding wastewater treatment technology mainly comprises a physicochemical method and a biological method. The physicochemical method is to treat the breeding wastewater by physical or chemical means, such as adsorption method, electrochemical oxidation method and flocculation precipitation method, which belongs to physicochemical treatment technology and can effectively treat the livestock and poultry breeding wastewater. More common biological treatment techniques include anaerobic treatment techniques and aerobic treatment techniques; the anaerobic treatment technology mainly comprises an anaerobic baffle treatment method and an internal circulation anaerobic reactor treatment method; the aerobic treatment technology comprises an activated sludge method, a contact oxidation method, a biological rotating disc method and an A/O treatment method. The concentration of the wastewater passing through the livestock breeding wastewater treatment system reaches the national standard, and the wastewater can be discharged to be used as irrigation water. Therefore, the livestock breeding wastewater treatment system meets the wastewater discharge requirement and has the wastewater reutilization capability, so that the efficient control of the breeding wastewater is realized; the livestock and poultry breeding wastewater treatment relates to the ecological environment safety of a breeding area and also relates to the physical health level of local residents. Therefore, reasonable technology and technology are adopted to strengthen the wastewater treatment, and the multi-technology combined technology is selected to improve the quality and efficiency of the cultivation wastewater treatment.

The existing cultivation wastewater meets the emission of 'quality standard of surface water environment' (GB 3838-2002) after solid-liquid separation and biogas slurry anaerobic fermentation, wherein equipment operation such as solid-liquid separation, flocculation, aeration, stirring treatment and the like in the processes of flocculation, anaerobic treatment, aeration and biomembrane culture activated sludge digestion and denitrification treatment increase the cost and require special maintenance and management; meanwhile, a large amount of catalyst (such as steel slag) and flocculant (such as polyaluminium ferric chloride) are added to reduce COD, nitrogen and phosphorus content in the wastewater, so that the content of chloride ions in the water body is increased to form secondary pollution, and the generated sludge needs to be treated again. Generally, a 5000-head-scale sow farm adopts engineering treatment, the construction cost is about 500-600 ten thousand yuan, the average water treatment cost is 15-18 yuan/ton, and part of farms are idle facilities for a long time to run for saving the wastewater treatment cost.

The ecological wetland is mainly adopted for the biotechnological treatment of the livestock and poultry breeding wastewater, and has the advantages of low investment, low operation cost, low technical threshold, high efficiency and the like, and is more and more valued and popularized and utilized by breeding enterprises. However, the conventional wetland has the disadvantages of incapability of directly treating sewage, poor adaptability, advanced treatment of the pretreated sewage, great influence (temperature) by environmental conditions, easiness in breeding mosquitoes in summer and the like. The existing constructed wetland treatment technology comprises three types of surface flow type, vertical flow type and subsurface flow type; the water depth of the surface flow wetland is generally 0.2-0.4m, the occupied area is large, and the hydraulic load is small; the vertical flow wetland has weak capability of removing organic pollutants and is easy to breed mosquitoes in summer; insufficient dissolved oxygen content in the undercurrent wetland leads to the problems of poor nitrification and denitrification capacity and the like. For example, patent CN112979087a discloses a large-scale three-dimensional subsurface flow constructed wetland system for treating livestock and poultry raising sewage; patent CN113233716a discloses a livestock and poultry cultivation sewage treatment system with combination of precipitation, natural fermentation and wetland; patent CN105967328A discloses a technology for treating cultivation wastewater by a straw-biochar-biological integrated constructed wetland. However, the technology has the defects of small hydraulic load, low concentration of treated wastewater and the like when being applied to livestock and poultry cultivation wastewater treatment, and cannot fully play the ecological and landscape functions of the wetland.

Disclosure of Invention

In order to solve the technical problems that in the prior art, the livestock and poultry breeding wastewater treatment has the defects of small hydraulic load, low concentration of the treated wastewater and the like, and the ecological and landscape functions of the wetland cannot be fully exerted, the utility model provides a breeding wastewater treatment system which organically combines ecological environment treatment with planting, fundamentally solves the problem of the pollution treatment of the breeding environment of breeding wastes, realizes the standard treatment of the breeding wastewater, improves the ecological environment and simultaneously obviously reduces the pollution control cost of enterprises, further extends an industrial chain under the pollution control condition, and utilizes a purified breeding wastewater to produce water celery (Bl.) DC by a series ecological floating bed, so that the standard discharge of the wastewater is realized, the planting water is met, the running cost is saved, and the economic benefit is improved.

In order to achieve the object, the utility model adopts the following technical scheme.

The culture wastewater treatment system comprises a biological matrix purifying tank and an ecological wetland, wherein the biological matrix purifying tank is connected to the ecological wetland through a pipeline and is used for enabling the culture wastewater treated by the biological matrix purifying tank to enter the ecological wetland through the pipeline; the ecological wetland is an open square pool, aquatic plants are planted in the pool, clay is adopted to tamp the bottom of the pool, and an impermeable geomembrane is paved; the ecological wetland comprises multistage ecological wetlands which are sequentially connected, the multistage ecological wetlands are arranged in a stepwise gradually descending mode, the water level of the upper-stage ecological wetland is higher than that of the lower-stage ecological wetland according to a preset height difference value, and the effluent of the upper-stage ecological wetland enters the lower-stage ecological wetland.

In addition, in the cultivation wastewater treatment system, the water outlet of the last stage in the multistage ecological wetland is connected to the ecological impounding reservoir, the ecological impounding reservoir is an open square pool, the bottom of the ecological impounding reservoir is tamped by clay, a fine sand layer is paved on the clay layer, a gravel layer is filled on the fine sand layer, and aquatic plants are planted on the gravel layer.

In addition, in the cultivation wastewater treatment system, the water outlet of the ecological reservoir is connected to the ecological floating bed planting area, the ecological floating bed planting area is of a pool structure, a plurality of ecological floating bed monomers which are connected with each other are arranged in the pool, and the ecological floating bed comprises square frame-shaped floating bed supports which are formed by polyvinyl chloride pipes and float on the water surface of the ecological floating bed planting area; the square floating bed support is internally provided with fixing ropes which are distributed vertically and horizontally at equal intervals, and the inner side of the square floating bed support and the fixing ropes are provided with mounting grooves for distributing a plurality of floating bed planting holes inside the square floating bed support; the floating bed planting hole is in a hollow cylinder shape, and the hollow part is provided with a sponge for fixing emergent aquatic plants planted in the hollow part, so that the emergent aquatic plant root system is immersed in the water in the ecological floating bed planting area.

In addition, in the cultivation wastewater treatment system, the U-shaped mounting frame is arranged on the outer side of the periphery of the floating bed support, the U-shaped mounting frame is horizontally arranged, two ends of an opening part of the U-shaped mounting frame are fixed on the outer side wall of the floating bed support through limit bolts, cantilever-shaped mounting columns extending outwards are fixed at two ends of the bottom of the U-shaped mounting frame, and limit slots are formed in the free ends of the mounting columns; the spacing slot of the free end of the mounting column of the adjacent ecological floating bed monomers is fixed by a spacing bolt, and a plurality of ecological floating bed bodies are connected with each other.

In addition, in the cultivation wastewater treatment system, the biological matrix purifying tank comprises a primary biological matrix purifying tank and a secondary biological matrix purifying tank, and the biological matrix purifying tank is used for introducing wastewater treated by the primary biological matrix purifying tank into the secondary biological matrix purifying tank through a pipeline; the primary biological matrix purifying tank and the secondary biological matrix purifying tank are filled with carbon sources according to a preset period.

In addition, in the culture wastewater treatment system, the front end of the biological matrix purifying tank also comprises a solid-liquid separation and grid tank and an adjusting temporary storage sedimentation tank; the solid-liquid separation and grid pool is used for carrying out secondary sludge separation and solid floating object interception after the culture wastewater is introduced through a pipe network or a ditch; the temporary storage adjusting sedimentation tank is used for adding a polymer sludge flocculant, rice straws, wheat straws and microbial agents into the cultivation wastewater, adjusting the carbon-nitrogen ratio and the pH value of the cultivation wastewater and optimizing the microbial community structure.

The cultivation wastewater treatment system can achieve the following technical effects.

1. Compared with the subsurface flow constructed wetland, the horizontal surface flow constructed wetland adopted in the utility model is similar to a natural wetland, the aquaculture wastewater flows through the surface of the wetland, and pollutants in the wastewater are removed by virtue of plant rhizome interception and biological film degradation generated on the rhizomes, so that the construction cost is low, the operation and the management are convenient, and the decontamination effect is good.

2. The sewage in the horizontal surface flow constructed wetland system flows through the wetland bed, such as a stepped structure of the multistage ecological wetland, can fully utilize the adsorption effect of the wetland bottom mud, has large hydraulic load, and has good removal effect on biological oxygen demand substances BOD, chemical oxygen demand substances COD, solid suspended substances SS and the like.

3. Carbon sources such as straw and wheat straw are added into the biological matrix purifying tank, the carbon-nitrogen ratio of the cultivation wastewater is adjusted, and part of nitrogen and phosphorus nutrition in the wastewater can be adsorbed, so that the subsequent ecological wetland treatment load is reduced, and the treatment efficiency is improved.

4. The tail ends of the multistage ecological wetlands are connected with ecological floating beds in series, so that the standard of the ecological wetlands is improved from meeting the pollutant emission standard of livestock and poultry farming (GB 18596-2001) to meeting the V standard of the surface water environment quality standard (GB 3838-2002).

5. Increasing the utilization income of ecological wastewater, and enabling an ecological floating bed to be 70 yuan/m according to the price ² The method comprises the steps of carrying out a first treatment on the surface of the The yield of the cress per mu in the ecological floating bed is 4000-5000kg, the selling price is 5 yuan/kg, 2-3 seasons can be planted in 1 year, and the investment cost is recovered in the same year.

Drawings

FIG. 1 is a schematic diagram showing the overall structure of a cultivation wastewater treatment system according to an embodiment of the present utility model.

FIG. 2 is a schematic view of an ecological floating bed unit of a wastewater treatment system for aquaculture according to an embodiment of the present utility model.

FIG. 3 is a schematic view of an ecological floating bed unit of a wastewater treatment system for aquaculture according to an embodiment of the present utility model.

FIG. 4 is a schematic view showing the structure of a plurality of ecological floating bed units of a cultivation wastewater treatment system according to an embodiment of the present utility model.

FIG. 5 is a schematic view of the structure of an ecological floating bed unit of a wastewater treatment system for aquaculture according to an embodiment of the present utility model.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

Detailed exemplary embodiments are disclosed below. However, specific structural and functional details disclosed herein are merely for purposes of describing example embodiments.

It should be understood, however, that the utility model is not limited to the particular exemplary embodiments disclosed, but is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure. Like reference numerals refer to like elements throughout the description of the drawings.

Referring to the drawings, the structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the disclosure of the present utility model, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, proportional changes, or adjustments of sizes may be made without affecting the efficacy of the utility model or achieving the purpose, and are therefore within the scope of the disclosure. In addition, the positional limitation terms recited in the present specification are used merely for convenience of description, and are not intended to limit the scope of the utility model, in which the relative changes or modifications are regarded as the scope of the utility model without any substantial modification to the technical content.

It should also be understood that the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. It will also be understood that when a component or element is referred to as being "connected" or "coupled" to another component or element, it can be directly connected or coupled to the other component or element or intervening components or elements may also be present. Moreover, other words used to describe the relationship between components or units should be interpreted in the same manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.).

FIG. 1 is a schematic diagram showing the overall structure of a cultivation wastewater treatment system according to an embodiment of the present utility model. As shown in the figure, in the specific embodiment of the utility model, the cultivation wastewater treatment system comprises a biological matrix purifying tank and an ecological wetland, wherein the biological matrix purifying tank is connected to the ecological wetland through a pipeline, and cultivation wastewater treated by the biological matrix purifying tank enters the ecological wetland through the pipeline; the ecological wetland is an open square pool, aquatic plants are planted in the pool, clay is adopted to tamp the bottom of the pool, and an impermeable geomembrane is paved; the ecological wetland comprises multistage ecological wetlands which are sequentially connected, the multistage ecological wetlands are arranged in a stepwise gradually descending mode, the water level of the upper-stage ecological wetland is higher than that of the lower-stage ecological wetland according to a preset height difference range, and the effluent of the upper-stage ecological wetland enters the lower-stage ecological wetland.

In addition, in the cultivation wastewater treatment system of the specific embodiment of the utility model, the water outlet of the last stage in the multistage ecological wetland is connected to an ecological impounding reservoir, the ecological impounding reservoir is an open square pool, the bottom of the ecological impounding reservoir is tamped by clay, a fine sand layer is paved on the clay layer, a gravel layer is filled on the fine sand layer, and aquatic plants are planted on the gravel layer.

In a more specific embodiment, the multistage ecological wetland comprises 5 stages of ecological wetland, each of which is specifically set as follows.

Primary ecological wetland treatment; constructing a primary ecological wetland with the production amount of 2-2.5 times of the volume of the culture wastewater, wherein the primary ecological wetland keeps the clear width of the bottom 6m, the upper port 6m, the length 10m and the height 0.6m, a frame adopts a brick-concrete structure with the thickness of 37cm, the bottom is compacted by clay with the diameter smaller than 0.01mm, the thickness is 40-50cm, a high-density polyethylene film HDPE composite impermeable geomembrane is paved, the water depth is kept at 30-35cm, the planting height is 10-15cm, green fox tail algae is planted for 7-10 days, after the culture wastewater is treated by the primary ecological wetland, the ammonia nitrogen and total nitrogen content are reduced by 80-90%, the total phosphorus content is reduced by 60-70%, and the COD content is reduced by 80-90%; the green foxtail algae with strong nitrogen and phosphorus absorption capacity can be used as green manure for orchards or processed into poultry feed after harvesting and airing. The water surface of the first-stage ecological wetland is about 15cm higher than that of the second-stage ecological wetland, and the effluent enters the bottom of the second-stage ecological wetland.

Secondary ecological wetland treatment: building a secondary ecological wetland with 2-2.5 times of the production amount of the aquaculture wastewater, wherein the wetland keeps the clear width of the bottom 6m, the upper port 6m, the length 10m and the height 0.6m, a frame adopts a brick-concrete structure with the thickness of 37cm, the bottom is compacted by clay with the diameter less than 0.01mm, the thickness is 20-25cm, an HDPE composite impermeable geomembrane is paved, the water depth is kept at 50-60cm, the planting height is 10-15cm, green foxtail algae is 7-10 days, after the wastewater is treated by the secondary foxtail algae ecological wetland, the ammonia nitrogen and the total nitrogen content are reduced by 50-60%, the total phosphorus content is reduced by 65-75%, and the COD content is reduced by 30-40%; the water surface of the secondary ecological wetland is about 15cm higher than that of the tertiary ecological wetland, and the effluent of the secondary ecological wetland enters the bottom of the tertiary ecological wetland.

Three-stage ecological wetland treatment: constructing a three-stage ecological wetland with 2-2.5 times of the production amount of the aquaculture wastewater, wherein the wetland keeps the clear width of the bottom 6m, the upper port 6m, the length 10m and the height 0.6m, a frame adopts a brick-concrete structure with the thickness of 37cm, the bottom is compacted by clay with the diameter smaller than 0.01mm, the thickness is 40-50cm, an HDPE composite impermeable geomembrane is paved, the water depth is kept at 30-35cm, the planting height is 10-15cm, green foxtail algae is 7-10 days, after the wastewater is treated by the three-stage foxtail algae ecological wetland, the ammonia nitrogen and total nitrogen content are reduced by 50-60%, the total phosphorus content is reduced by 65-75%, and the COD content is reduced by 30-40%; the water surface of the three-stage ecological wetland is about 15cm higher than that of the four-stage ecological wetland, and the water discharged from the three-stage ecological wetland enters the bottom of the four-stage ecological wetland.

Four-stage ecological wetland treatment: building a four-stage ecological wetland with 2-2.5 times of the production amount of the aquaculture wastewater, wherein the wetland keeps the clear width of the bottom 6m, the upper port 6m, the length 10m and the height 0.6m, a frame adopts a brick-concrete structure with the thickness of 37cm, the bottom is compacted by clay with the diameter smaller than 0.01mm, the thickness is 20-25cm, an HDPE composite impermeable geomembrane is paved, the water depth is kept at 50-60cm, the planting height is 10-15cm, green algae is 7-10 days, after the wastewater is treated by the four-stage algae ecological wetland, the ammonia nitrogen and the total nitrogen content are reduced by 35-45%, the total phosphorus content is reduced by 65-75%, and the COD content is reduced by 25-35%; the water surface of the four-stage ecological wetland is about 15cm higher than that of the five-stage ecological wetland, and the water discharged from the four-stage ecological wetland enters the bottom of the five-stage ecological wetland.

Five-stage ecological wetland treatment; building a three-stage ecological wetland with 2-2.5 times of the production amount of the aquaculture wastewater, wherein the wetland keeps the clear width of the bottom 6m, the upper port 6m, the length 10m and the height 0.6m, a frame adopts a brick-concrete structure with the thickness of 37cm, the bottom is compacted by clay with the diameter smaller than 0.01mm, the thickness is 40-50cm, an HDPE composite impermeable geomembrane is paved, the water depth is kept at 30-35cm, the planting height is 10-15cm, green algae is 7-10 days, after the wastewater is treated by the four-stage algae ecological wetland, the ammonia nitrogen and total nitrogen content are reduced by 35-40%, the total phosphorus content is reduced by 60-70%, and the COD content is reduced by 30-40%; and the effluent of the five-stage ecological wetland enters the bottom of an ecological reservoir.

In the above arrangement, the thickness of the clay layer is different from the first-stage ecological wetland to the fifth-stage ecological wetland, because the whole wetland is in stepped descent, and in general, the water storage height of the upper-stage ecological wetland is 15cm more than that of the lower-stage ecological wetland. Firstly, in order to prolong the hydraulic retention time, the self-flow of the aquaculture wastewater in the system is maintained, and nitrogen is absorbed, nitrified and denitrified in the flowing process, and phosphorus is absorbed and fixed. Meanwhile, the clay with different thickness can reduce the infiltration of phosphate and ammonia nitrogen in high-concentration cultivation wastewater to the underground, and the setting required by the adsorption of the matrix and the growth and absorption of the aquatic plants is considered. In addition, the different water depths of the wastewater are to keep a certain water potential of the ecological wetland, so that the flowing water body is in contact with air to increase the content of dissolved oxygen in the water body, and the conversion of ammonia nitrogen in the wastewater into nitrate nitrogen by microorganisms is promoted.

The height difference from the front end to the tail end of the ecological wetland is 15cm, and the aquaculture wastewater uniformly flows from the front end to the tail end and from the surface to the bottom in the system, so that the wastewater is fully contacted with biological matrix carbon sources such as straw, wheat straw and the like, the wastewater is fully contacted with the foxtail algae plants and microorganisms attached to the foxtail algae plants, nitrogen and phosphorus absorption of the foxtail algae and ammonia nitrogen and COD conversion of the microorganisms are accelerated, and the main pollutant contents such as COD, ammonia nitrogen, total phosphorus and the like of the discharged water of the tail end of the system (five-stage ecological wetland) meet the requirement of the highest allowable daily discharge concentration of pollutant discharge standards of livestock and poultry farming industry (GB 18596-2001). If the water quality does not meet the above standard, the wastewater in the ecological reservoir can be pumped to the first-stage wetland for cyclic purification treatment until the water quality standard is met.

In addition, fig. 2 is a schematic structural view of an ecological floating bed unit of a cultivation wastewater treatment system according to an embodiment of the present utility model; FIG. 3 is a schematic view of an ecological floating bed unit of a wastewater treatment system for aquaculture according to an embodiment of the present utility model; FIG. 4 is a schematic view showing the structure of a plurality of ecological floating bed units of a cultivation wastewater treatment system according to an embodiment of the present utility model; FIG. 5 is a schematic view of the structure of an ecological floating bed unit of a wastewater treatment system for aquaculture according to an embodiment of the present utility model. As shown in the figure, in the cultivation wastewater treatment system of the specific embodiment of the utility model, the water outlet of the ecological reservoir is connected to the ecological floating bed planting area, the ecological floating bed planting area is of a pool structure, a plurality of ecological floating bed monomers which are connected with each other are arranged in the pool, the ecological floating bed comprises a square frame-shaped floating bed bracket formed by polyvinyl chloride (PVC) pipes 21, an elbow 20 is formed around the PVC pipes 21, and the square frame-shaped floating bed bracket floats on the water surface of the ecological floating bed planting area; the square floating bed support is internally provided with fixing ropes 22 which are distributed vertically and horizontally at equal intervals, and the inner side of the square floating bed support and the fixing ropes 22 are provided with mounting grooves 102 for distributing a plurality of floating bed planting holes 23 in the square floating bed support; the floating bed planting hole 23 is in a hollow cylinder shape, the hollow part is provided with a sponge for fixing the emergent aquatic plant 3 planted in the hollow part, and the emergent aquatic plant 3 is cress, so that the root system of the emergent aquatic plant 3 is immersed in the ecological floating bed planting area water.

In order to further improve the transparency of water discharged into an ecological floating bed planting area, the root system of emergent aquatic plants (water fennel) planted in the ecological floating bed is utilized to absorb nitrogen, phosphorus, organic matters and the like in water to transfer water nutrition, thereby reducing the water fishy smell and eutrophication phenomenon caused by the closed water or the self-circulation deficiency of the water; finally, the effluent reaches the quality standard of the surface water environment (GB 3838-2002) to meet the requirements of irrigation and greening water, the ecological system of the water body is restored to realize economic benefits, and natural ecological balance is achieved.

In addition, in the cultivation wastewater treatment system, the U-shaped mounting frames 105 are arranged on the outer sides of the periphery of the floating bed support, the U-shaped mounting frames 105 are horizontally arranged, two ends of an opening part of each U-shaped mounting frame 105 are fixed on the outer side wall of the floating bed support through limiting bolts, and specifically, the U-shaped mounting frames are fixed on the mounting slots 101 of the outer side wall through limiting bolts. Cantilever-shaped mounting columns 103 extending outwards are fixed at two ends of the bottom of the U-shaped mounting frame 105, and limiting slots are formed in the free ends of the mounting columns 103; the spacing slot of the free end of the mounting column of the adjacent ecological floating bed monomers is fixed by a spacing bolt, and a plurality of ecological floating bed bodies are connected with each other.

The growth period of the ecological floating bed of the cress is divided into a growing period, a vigorous period and a withering period; generally, fertilizer application is not needed for planting cress in the cultivation wastewater, and if the cress leaves are yellowing, urea solution with the concentration of 0.2% can be sprayed for 1 time every 7-10 days and continuously sprayed for 3 times; harvesting until the height of the cress reaches 40-45 cm. After harvesting the cress, the water quality of the temporary wastewater storage pool is detected to reach the standard of surface water environment quality (GB 3838-2002) V, and then the water can be discharged or green in the park.

In the specific embodiment of the utility model, the price of the ecological floating bed planting area is 70 yuan/m ² The construction cost per mu is 46690 yuan; the average yield of cress per mu is 4000-5000 kg/stubble, the average selling price is 5 yuan/kg, the average growing period is 2 months, 2-3 seasons can be planted in 1 year in northern areas, and the cost can be recovered in the same year. Therefore, the specific embodiment of the utility model has the advantages of good economic benefit and low cost.

In addition, in the cultivation wastewater treatment system of the specific embodiment of the utility model, the biological matrix purifying tank comprises a primary biological matrix purifying tank and a secondary biological matrix purifying tank, and the biological matrix purifying tank is used for introducing wastewater treated by the primary biological matrix purifying tank into the secondary biological matrix purifying tank through a pipeline; the primary biological matrix purifying tank and the secondary biological matrix purifying tank are filled with carbon sources according to a preset period.

More specifically, primary biological matrix decontamination cell treatment: constructing a primary matrix purifying tank, for example, the bottom of the primary biological matrix purifying tank has an optimal clear width of 6m, an upper port of 6m, an optimal length of 10m and an optimal height of 0.6m, and the specific size of 10-12m (length) ×6-8m (width) ×0.6-0.8m (height) can be properly adjusted, and each time, 2-2.5 tons of carbon sources such as straw and wheat straw are added (the straw and the wheat straw are gradually degraded and are added every 4-5 months), so as to absorb, consume and reduce COD, nitrogen and phosphorus in the wastewater; generally, the primary biological matrix purifying pond can reduce ammonia nitrogen and total nitrogen content in the cultivation wastewater by 12-22%, reduce total phosphorus content by 40-50%, reduce COD content of chemical oxygen demand substances by 18-25%, and introduce the wastewater treated by the primary biological matrix purifying pond into the secondary biological matrix purifying pond for treatment through a pipeline.

The second biological matrix purification tank treatment is carried out: constructing a secondary matrix purifying tank, wherein the optimal clear width of the bottom of the secondary biological matrix purifying tank is 6m, the upper port is 6m, the optimal length is 10m, the optimal height is 0.6m, the specific size is 10-12m (length) ×6-8m (width) ×0.6-0.8m (height) can be properly adjusted, and 2-2.5 tons of carbon sources such as straw, wheat straw and the like are added each time (the straw and the wheat straw are gradually degraded and are added every 4-5 months); generally, the primary biological matrix is purified and reduced to reduce the ammonia nitrogen and total nitrogen content in the wastewater by 7-17%, the total phosphorus content by 50-60% and the COD content by 25-35%, and the wastewater treated by the secondary biological matrix purifying pond is introduced into the bottom of the primary ecological wetland through a pipeline.

In addition, in the cultivation wastewater treatment system of the specific embodiment of the utility model, the front end of the biological matrix purifying tank also comprises a solid-liquid separation and grid tank and a temporary storage sedimentation tank; the solid-liquid separation and grid pool is used for carrying out secondary sludge separation and solid floating object interception after the culture wastewater is introduced through a pipe network or a ditch; the temporary storage adjusting sedimentation tank is used for adding a polymer sludge flocculant, rice straws, wheat straws and microbial agents into the cultivation wastewater, adjusting the carbon-nitrogen ratio and the pH value of the cultivation wastewater and optimizing the microbial community structure.

Application example 1:

purifying the cultivation wastewater discharged by solid-liquid separation and biogas fermentation of the waste of the cultivation farm according to the process flow shown in fig. 1: delivering the culture wastewater to a primary biological matrix purifying pond 30-40 days after the culture wastewater is purified and precipitated in a secondary oxidation pond, performing denitrification and dephosphorization and adjusting the carbon-nitrogen ratio of the wastewater to obtain primary treated wastewater, wherein 5-6 tons of straw carbon sources are added into the front-end primary biological matrix purifying pond, and the primary treated wastewater is replaced every 6 months; the effluent of the primary biological matrix purifying tank enters a secondary biological matrix purifying tank to carry out denitrification and dephosphorization and adjust the carbon-nitrogen ratio of the wastewater to obtain the secondary treated wastewater, and 5-6 tons of straw carbon source is added into the secondary biological matrix purifying tank and is replaced every 6 months.

And (3) conveying the effluent of the secondary biological matrix purifying pond to a primary ecological wetland (the length multiplied by the width multiplied by the height is 10m multiplied by 6m multiplied by 0.6 m) for purification to obtain effluent, and sequentially passing through secondary, tertiary, quaternary and fifth ecological wetlands to an ecological reservoir.

In the embodiment, the COD value of the pond culture wastewater is 2123mg/L, the ammonia nitrogen content is 370mg/L, the total phosphorus content is 66.9mg/L, five times of periodic sampling analysis are performed in advance, and the treatment conditions of each process section are shown in the following table:

TABLE 1COD monitoring results (mg/L)

The ammonia nitrogen monitoring results are shown in the following table:

TABLE 2 Ammonia nitrogen monitoring results (mg/L)

In addition, the total phosphorus monitoring results are shown in the following table:

TABLE 3 Total phosphorus monitoring results (mg/L)

As can be seen from tables 1 to 3, the COD value of the effluent after being treated by the cultivation wastewater treatment system of the specific embodiment of the utility model is 263mg/L on average, the ammonia nitrogen content is 61.2mg/L, the total phosphorus content is 7.6mg/L, and the effluent meets the standards of livestock and poultry cultivation pollutant emission Standard (GB 18596-2001) that COD is lower than 400mg/L, ammonia nitrogen is lower than 80mg/L and total phosphorus is lower than 8.0 mg/L; the average removal rate of COD is 87.6%, the average removal rate of ammonia nitrogen is 83.5%, and the average removal rate of total phosphorus is 88.6%, which indicates that the system can effectively remove pollutants such as COD, ammonia nitrogen, total phosphorus and the like in the cultivation wastewater; the cultivation wastewater treatment system of the specific embodiment of the utility model can still meet the emission standard after one year of operation, which indicates that the wetland has large load and good operation. In addition, the cultivation wastewater treatment system of the specific embodiment of the utility model has the advantages of simple structure, low operation and maintenance cost and good application prospect.

In the cultivation wastewater treatment system of the specific embodiment of the utility model, the water yielding standard of the five-stage ecological wetland is that the water quality condition of the cultivation of the water cress with an ecological floating bed, namely the COD value is 263mg/L, the ammonia nitrogen content is 61.2mg/L, the total phosphorus content is 7.6mg/L, the cultivation is carried out for two times in 2022 in 4-9 months, and the water quality and the water cress growth condition are shown in the following table.

TABLE 4 monitoring of Oenanthe Javanica growth status and Water yield

As can be seen from Table 4, the average plant height of the Oenanthe Javanica before cultivation is 14.7cm, and the average plant height at harvest is 32.7cm; the fresh weight of the single plant before cultivation is increased to 41.7 g/plant when harvesting by 12.2 g; the average COD value of the wastewater is 34.3mg/L, the ammonia nitrogen is 1.65mg/L, the total phosphorus is 0.37mg/L, the average COD removal rate of the ecological floating bed is 87.0%, the average ammonia nitrogen removal rate is 97.3%, the average total phosphorus removal rate is 95.1%, the effluent accords with the standard of the quality Standard of surface Water environment (GB 3838-2002) V, the income of 8000-10000 yuan/mu is realized, and the sustainable treatment of the aquaculture wastewater is promoted.

Therefore, the cultivation wastewater treatment system according to the embodiment of the present utility model can achieve the following technical effects.

1. Compared with the subsurface flow constructed wetland, the horizontal surface flow constructed wetland adopted in the utility model is similar to a natural wetland, the aquaculture wastewater flows through the surface of the wetland, and pollutants in the wastewater are removed by virtue of plant rhizome interception and biological film degradation generated on the rhizomes, so that the construction cost is low, the operation and the management are convenient, and the decontamination effect is good.

2. The sewage in the horizontal surface flow constructed wetland system flows through the wetland bed, such as a stepped structure of the multistage ecological wetland, can fully utilize the adsorption effect of the wetland bottom mud, has large hydraulic load, and has good removal effect on biological oxygen demand substances BOD, chemical oxygen demand substances COD, solid suspended substances SS and the like.

3. Carbon sources such as straw and wheat straw are added into the biological matrix purifying tank, the carbon-nitrogen ratio of the cultivation wastewater is adjusted, and part of nitrogen and phosphorus nutrition in the wastewater can be adsorbed, so that the subsequent ecological wetland treatment load is reduced, and the treatment efficiency is improved.

4. The tail ends of the multistage ecological wetlands are connected with ecological floating beds in series, so that the standard of the ecological wetlands is improved from meeting the pollutant emission standard of livestock and poultry farming (GB 18596-2001) to meeting the V standard of the surface water environment quality standard (GB 3838-2002).

5. Increasing the utilization income of ecological wastewater, and enabling an ecological floating bed to be 70 yuan/m according to the price ² The method comprises the steps of carrying out a first treatment on the surface of the The yield of the cress per mu in the ecological floating bed is 4000-5000kg, the selling price is 5 yuan/kg, 2-3 seasons can be planted in 1 year, and the investment cost is recovered in the same year.

While the foregoing description illustrates and describes the preferred embodiments of the present utility model, it is to be understood that the utility model is not limited to the form disclosed herein, but is not to be construed as limited to other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or skills of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims (6)

1. The culture wastewater treatment system comprises a biological matrix purifying tank and an ecological wetland, wherein the biological matrix purifying tank is connected to the ecological wetland through a pipeline and is used for enabling the culture wastewater treated by the biological matrix purifying tank to enter the ecological wetland through the pipeline; the ecological wetland is an open square pool, aquatic plants are planted in the pool, clay is adopted to tamp the bottom of the pool, and an impermeable geomembrane is paved; the ecological wetland is characterized by comprising multiple stages of ecological wetlands which are sequentially connected, wherein the multiple stages of ecological wetlands are arranged in a stepwise gradually descending mode, and the water level of the upper stage of ecological wetland is higher than that of the lower stage of ecological wetland according to a preset height difference value, and the effluent of the upper stage of ecological wetland enters the lower stage of ecological wetland.

2. The aquaculture wastewater treatment system according to claim 1, wherein the effluent of the last stage of the multistage ecological wetland is connected to an ecological reservoir, the ecological reservoir is an open square pond, the bottom is tamped with clay, a fine sand layer is laid on the clay layer, a gravel layer is filled on the fine sand layer, and aquatic plants are planted on the gravel layer.

3. The aquaculture wastewater treatment system according to claim 2, wherein the effluent of the ecological reservoir is connected to an ecological floating bed planting area, the ecological floating bed planting area is of a pool structure, a plurality of ecological floating bed monomers connected with each other are arranged in the pool, the ecological floating bed comprises a square floating bed bracket formed by polyvinyl chloride pipes, and the square floating bed bracket floats on the water surface of the ecological floating bed planting area; the square floating bed support is internally provided with fixing ropes which are distributed vertically and horizontally at equal intervals, and the inner side of the square floating bed support and the fixing ropes are provided with mounting grooves for distributing a plurality of floating bed planting holes inside the square floating bed support; the floating bed planting hole is in a hollow cylinder shape, and the hollow part is provided with a sponge for fixing emergent aquatic plants planted in the hollow part, so that the emergent aquatic plant root system is immersed in the water in the ecological floating bed planting area.

4. The aquaculture wastewater treatment system according to claim 3, wherein the outer sides of the periphery of the floating bed support are provided with U-shaped mounting frames which are horizontally arranged, two ends of an opening part of each U-shaped mounting frame are fixed on the outer side wall of the floating bed support through limit bolts, two ends of the bottom of each U-shaped mounting frame are fixedly provided with cantilever-shaped mounting columns which extend outwards, and the free ends of the mounting columns are provided with limit slots; the spacing slot of the free end of the mounting column of the adjacent ecological floating bed monomers is fixed by a spacing bolt, and a plurality of ecological floating bed bodies are connected with each other.

5. The aquaculture wastewater treatment system of claim 1 wherein the biological substrate purification tank comprises a primary biological substrate purification tank and a secondary biological substrate purification tank for introducing wastewater treated by the primary biological substrate purification tank into the secondary biological substrate purification tank through a conduit; the primary biological matrix purifying tank and the secondary biological matrix purifying tank are filled with carbon sources according to a preset period.

6. The aquaculture wastewater treatment system according to claim 1, further comprising a solid-liquid separation and grid tank at the front end of the biological substrate purification tank, and a temporary storage sedimentation tank; the solid-liquid separation and grid pool is used for carrying out secondary sludge separation and solid floating object interception after the culture wastewater is introduced through a pipe network or a ditch; the temporary storage adjusting sedimentation tank is used for adding a polymer sludge flocculant, rice straws, wheat straws and microbial agents into the cultivation wastewater, adjusting the carbon-nitrogen ratio and the pH value of the cultivation wastewater and optimizing the microbial community structure.

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