LU504773B1 - Ecological treatment system for dispersed kitchen wastewater in rural areas - Google Patents
Ecological treatment system for dispersed kitchen wastewater in rural areas Download PDFInfo
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- LU504773B1 LU504773B1 LU504773A LU504773A LU504773B1 LU 504773 B1 LU504773 B1 LU 504773B1 LU 504773 A LU504773 A LU 504773A LU 504773 A LU504773 A LU 504773A LU 504773 B1 LU504773 B1 LU 504773B1
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- 239000000758 substrate Substances 0.000 claims abstract description 112
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 36
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 5
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 5
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/002—Grey water, e.g. from clothes washers, showers or dishwashers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2826—Anaerobic digestion processes using anaerobic filters
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
An ecological treatment system for dispersed kitchen wastewater in rural areas is provided, including a substrate enhancing treatment system and a wetland absorption system. The substrate enhancing treatment system comprises a sedimentation tank and a plurality of biological substrate treatment units which are sequentially connected in series through communication pipelines. The biological substrate treatment units are filled with a naturally degradable biological substrate filler. The wetland absorption system comprises three or more than three ecological wetlands which are communicated by pipelines. According to the invention, a communicated ecological treatment system in which wastewater flows along the pipelines is constructed, and the technological parameters of the ecological treatment system construction are defined, which mainly include hydraulic retention time, area coefficient of substrate enhancing treatment system, input coefficient of biological substrate , area coefficient of wetland absorption system, etc., so that the ecological treatment system has strong operability and wide applicability.
Description
DESCRIPTION LU504773
ECOLOGICAL TREATMENT SYSTEM FOR DISPERSED KITCHEN
WASTEWATER IN RURAL AREAS
The invention relates to the technical field of wastewater treatment, and in particular to an ecological treatment system for dispersed kitchen wastewater in rural areas.
Under the situation that industrial and urban waste pollution has been gradually controlled, agricultural non-point source pollution has become an important aspect of rural environmental problems in China, which has attracted great attention of the Central
Committee of the Communist Party of China and the State Council. The Outline of the
Thirteenth Five-Year Plan for National Economic and Social Development puts forward to promote the comprehensive improvement of rural environment, and calls for the comprehensive improvement of agricultural and rural water pollution. China's agricultural and rural water pollution mainly comes from village life pollution, livestock and poultry breeding pollution, agricultural products processing wastewater and farmland drainage.
Compared with urban wastewater treatment, rural water pollution sources are complex and widely distributed, and the cost of centralized wastewater collection is too high.
Therefore, dispersed wastewater treatment is often adopted in rural areas where population is not concentrated. Especially, with the rise and development of modern sightseeing agriculture and leisure agriculture, there are more and more agritainment resorts and restaurants, which not only increase farmers' income, but also increase the discharge of kitchen waste wastewater and aggravate the rural environmental pollution.
The kitchen waste wastewater mainly comes from the water contained in the kitchen waste itself and the water produced in the fermentation process of the waste.
The composition of the kitchen waste wastewater is complex, and the organté/504773 matter content is high, mainly including food fiber, starch, fat, animal and vegetable oil, various seasonings, detergents and protein. Because the fatty acids decomposed from kitchen waste under high temperature hydrolysis are not further degraded, the mass concentration of chemical oxygen demand (COD) in the wastewater is increased, and the solid content of kitchen waste is rich in protein, and the protein is ammoniated in the digestion process, resulting in a high level of ammonia nitrogen and total nitrogen concentration in kitchen waste wastewater, further resulting in a low carbon-nitrogen ratio. The low carbon-nitrogen ratio not only affects anaerobic digestion, but also affects the subsequent biochemical treatment of wastewater. Due to the inhibition of high ammonia nitrogen, biochemical treatment is difficult.
At present, subsurface flow wetland and surface flow wetland (including ecological ditches) are widely used in dispersed wastewater treatment in rural areas, and they are also relatively successful ecological wastewater treatment technologies. For example, the invention patent CN102897980A discloses a combined urban wastewater treatment constructed wetland system and urban wastewater treatment method. The system includes a biological regulating tank unit, an aerobic degradation and microbial culture tank, a subsurface flow wetland and a surface flow wetland which are connected in series in sequence. The substrate in the subsurface flow wetland is gravel layer, fine sand layer, mixed layer of vermiculite and fine sand, and mixed layer of fine sand and red soil in sequence from bottom to top, and various aquatic plants of emergent type, floating leaf type, floating type and submerged type are arranged in the surface flow wetland from shallow to deep. However, in the above method, porous media materials such as gravel and fine sand are used as the percolation layer, and the adsorption performance of the percolation layer for pollutants will decrease with the increase of wetland operation time, which will eventually lead to the complete failure of the whole system and increase the cost. Meanwhile, there is a high content of wastewater oil in kitchen wastewater, which degrades slowly and floats on the surface of wastewater.
After entering the surface flow wetland, the wastewater oil will attach to the lebf)504773 surface or stem of wetland plants, which will easily lead to plant death. Moreover, the design and construction of subsurface flow wetland and surface flow wetland are lack of unified technical specifications, which leads to great arbitrariness in the setting of process parameters in actual engineering construction. The invention patent
CN110040850A discloses an Anaerobic-Anoxic-Oxic (A/A/O) and magnesium ammonium phosphate (MAP) combined treatment method for kitchen waste water, which includes the following steps: (1) adjusting the pH of waste water to pH = 6.8-7.5; (2) allowing the wastewater with adjusted pH to enter an A/A/O system, where the A/A/O system includes an anaerobic fermentation tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank, so that the wastewater sequentially enters the anaerobic fermentation tank, the anoxic tank, the aerobic tank and the secondary sedimentation tank; (3) allowing the sediment in the anaerobic fermentation tank and the sludge in the step (2) to enter the MAP system; (4) adding flocculant into the MAP reaction tank; and (5) allowing product treated in step (4) to enter the MAP sedimentation tank and standing until the supernatant and sediment are obviously layered. However, because the kitchen wastewater oil content is high and floats on the surface of wastewater, it is not easy to degrade and remove kitchen wastewater oil by anaerobic bacteria or anoxic bacteria.
Therefore, it is difficult for the commonly used "anaerobic fermentation tank/subsurface flow wetland" to effectively treat kitchen wastewater in rural areas.
SUMMARY LU504773
In view of the shortcomings of the prior art, the invention aims to provide an ecological treatment system for dispersed kitchen wastewater in rural areas, which solves the problems of poor treatment effect and high cost of animal and vegetable oil pollution in kitchen wastewater in the existing methods.
In order to solve the above technical problems, the invention adopts the following technical scheme: an ecological treatment system for dispersed kitchen wastewater in rural areas includes a substrate enhancing treatment system and a wetland absorption system. The substrate enhancing treatment system includes one sedimentation tank and a plurality of biological substrate treatment units which are sequentially connected in series end to end through communication pipelines. The sedimentation tank is communicated with a kitchen wastewater discharge pipeline. the biological substrate treatment units are filled with a naturally degradable biological substrate filler. The substrate enhancing treatment system is connected with the wetland absorption system through the communication pipeline. The wetland absorption system includes more than three ecological wetlands which are communicated by pipelines, and the upper part of the wetland absorption system is planted with vegetation.
The sedimentation tank is the primary place for settling and performing anaerobic treatment of kitchen wastewater, and biological substrate treatment units are the secondary places for putting biological substrate, adsorbing and decomposing wastewater pollutants. The substrate enhancing treatment system generally includes one sedimentation tank or more than two biological substrate treatment units.
Optionally, both the sedimentation tank and the biological substrate treatment units in the substrate enhancing treatment system are regularly closed tanks, and the bottom and peripheral walls of the tanks need to be hardened and impervious to prevent wastewater from leaking out. The top of the tanks is hardened and sealed, but a working wellhead with a diameter of about 60 cm is reserved for removing sediments or putting biological substrate filler during system maintenance. During the operation of the system, each wellhead is closed with a manhole cover.
Optionally, the tank walls of the biological substrate treatment units are providéd/504773 with a plurality of sockets. The sockets are uniformly distributed in a rectangular array and sockets on corresponding tank walls are correspondingly arranged, and blocking rods are arranged between the corresponding sockets. In this way, the biological substrate filler is distributed on a plurality of water layers, and the adsorption of nitrogen, phosphorus, animal and vegetable oil pollution and other pollutants in wastewater by the biological substrate filler is enhanced.
The two adjacent sockets are separated by 1.0-1.5 m in the horizontal direction, and the two adjacent sockets are separated by 0.2-0.8 m in the vertical direction.
Optionally, the water inlets of the biological substrate treatment units and the ecological wetlands are arranged at the bottom of one side wall, and the water outlets are arranged at the top of the other side wall, so that the water outlets and the water inlets of the biological substrate treatment units and the ecological wetlands are arranged diagonally. In this way, the kitchen wastewater enters from the bottom and is discharged from the diagonal top, and the path it passes is long, which makes the adsorption of pollutants such as nitrogen, phosphorus, animal and vegetable oil pollution in the wastewater more thorough and more efficient.
Optionally, the total area of the substrate enhancing treatment system is determined according to the following formula (1):
Sa = N « V, = D/H, (1), where Sa is the total construction area (m?) of substrate enhancing treatment system; N is the maximum number of diners per day; Vs is the volume coefficient of the substrate enhancing treatment system for a single tourist, with a value of 0.1-0.25 m°; D is the retention time of wastewater in the substrate enhancing treatment system; Hs is the highest water level in the substrate enhancing treatment system. In actual construction, the volume coefficient of substrate enhancing treatment system can be flexibly adjusted according to the actual situation.
If the land area is sufficient, the coefficient can be appropriately increased, and tHgJ504773 overall principle is to keep the hydraulic retention time of wastewater in the substrate enhancing treatment system not less than 7 days. Optionally, the construction area ratio of sedimentation tank and biological substrate treatment units is 1:4.
Optionally, the biological substrate filler is one or more of rice straw, wheat straw and corn stalk. Optionally, after the biological substrate filler is expanded, the porosity of cellulose in the biological substrate is increased, the surface groups of cellulose are exposed, and its adsorption capacity and adsorption capacity are improved. Optionally, corn stalks need to be crushed (particle size < 5 mm) and used jointly with a certain amount of rice straw or wheat straw. The ratio of corn stalk to rice straw/wheat stalk is 2:3.
Optionally, the input of the biological substrate filler is determined according to the following formula (2):
W = Vx PB, (2), where W is the total amount of filler (kg) put in by the biological substrate treatment units; V is the total volume of the substrate enhancing treatment system; Ps is the input coefficient of biological substrate filler per unit volume of wastewater, with a value of 20 - kg/m°. In view of the fact that the decomposition time of straw filler is 3 - 4 months, the input frequency of straw filler is 3 times/year, and the total input amount of each time is 1/3(W/3) of the total amount.
Optionally, the total area of the wetland absorption system is determined according to the following formula (3):
S, =N*P, (3), where Sp is the total area (m?) of the wetland absorption system, and N is the maximum number of diners per day; Pa is the wetland construction area coefficient of a single dining visitor, with a value of 1-2.5 m2. The water depth of the ecological wetland is maintained at about 1.5-2.5 m. In actual construction, it is required to flexibly adjust the water depth of the wetlands under the condition that the hydraulic retention of the wetland absorption system is not less than 14 days.
Optionally, large emergent plants, small emergent plants and floating plants as tHdJ504773 aquatic plants in the multistage wetland are arranged in sequence and the corresponding planting area allocation ratio is 3:3:4. Three kinds of aquatic plants, high-medium-low are arranged in the multistage wetland along the direction of wastewater self-flow, which is beneficial to promote the adsorption and degradation of residual sewage oil in the wetlands.
Compared with the prior art, the invention has the following beneficial effects:
Firstly, in view of the characteristics of rural kitchen wastewater, such as dispersion, high organic concentration and high oil pollution content, the ecological treatment system for rural dispersed kitchen wastewater is a coupling process of substrate enhancing treatment system and wetland absorption system, and the traditional anaerobic fermentation/subsurface flow wetland technology is replaced by the technical combination of substrate enhancing treatment and wetland absorption. By putting in naturally degradable biological substrate materials and rational allocation of different wetland plants, organic pollutants such as nitrogen, phosphorus and oil pollution in kitchen wastewater can be effectively absorbed and degraded, with capability of treating dispersed kitchen wastewater in rural areas. It not only solves the problem of removal and degradation of sewage oil in kitchen wastewater, but also overcomes the weakness that traditional subsurface flow wetland needs to be excavated for replacing adsorbing material periodically. In addition, according to the characteristics of dispersed kitchen wastewater in rural areas, the invention defines the technological parameters of the construction of the substrate enhancing treatment system and the wetland absorption system, such as the hydraulic retention time of 14 days, the volume coefficient of the substrate enhancing treatment system of 0.1-0.25 m°/person, the input coefficient of biological substrate of 20-30 kg/m? and the wetland area coefficient of 1-2.5 m?/person, etc., which significantly improves the wastewater treatment effect, has strong operability and has good popularization and application.
Secondly, the invention takes natural biological substrate materials (rice strawiJ504773 wheat straw and corn stalk) as raw materials, which are rich in sources and low in price, and are renewable and environmentally friendly. In the treatment process, the natural biological substrate materials can be directly decomposed without post-treatment, thus increasing the treatment and utilization ways of straw wastes of bulk crops such as rice straw, wheat straw and corn stalk, avoiding environmental pollution and having good application prospects.
Lastly, the structure of the invention is simple, and the operation is convenient. The wetland absorption system can be formed by one or more outdoor drainage ditches and natural or newly excavated pits and ponds, which is suitable for rural dispersion, durable, good in treatment effect, and has strong practicability and wide applicability.
Fig. 1 is a schematic structural diagram of a dispersed kitchen wastewater treatment system in rural areas.
DESCRIPTION OF THE INVENTION LU504773
The present invention will be further described in detail with embodiments.
As shown in FIG. 1, An ecological treatment system for dispersed kitchen wastewater in rural areas provided by the invention includes a substrate enhancing treatment system and a wetland absorption system. The substrate enhancing treatment system includes a sedimentation tank and three biological substrate treatment units which are sequentially connected in series end to end through communication pipelines.
The sedimentation tank is communicated with a kitchen wastewater discharge pipeline.
The biological substrate treatment units are filled with a naturally degradable biological substrate filler. The bottom and the side walls of the sedimentation tank and the biological substrate treatment units are impermeable structures. The substrate enhancing treatment system is connected with the wetland absorption system through the communication pipeline. The wetland absorption system includes more than three ecological wetlands which are communicated by communication pipelines.
The principle and effect of the above technical scheme are as follows: firstly, the insoluble objects in wastewater are precipitated and anaerobically treated by the system through sedimentation treatment. Then nitrogen, phosphorus and sewage oil in the wastewater are absorbed and degraded by a plurality of biological substrate treatment units, and finally pollutants in the wastewater are further absorbed and by a wetland absorption system, so that the nitrogen and phosphorus in the wastewater can be removed, and the animal and plant sewage oil can also be efficiently removed as well, thus completing the ecological treatment of kitchen wastewater.
This Embodiment comes from a wastewater treatment site of an agritainment resort in Zhejiang province. The agritainment resort received about 100 people at the peak of dining tourists per day. Before the construction of wastewater treatment facilities, the kitchen wastewater in agritainment resort mixed with domestic wastewater was not treated, and it was directly discharged into the environment through the sewer, which caused great pollution to the surrounding water environment.
Due to the lack of available ditches and natural pits around, the wastewatét/504773 treatment facility was newly built on abandoned land.
The treatment system for kitchen wastewater includes the substrate enhancing treatment system and the wetland absorption system. The substrate enhancing treatment system includes the sedimentation tank and a plurality of biological substrate treatment units which are sequentially connected in series end to end through the communication pipelines. The sedimentation tank is communicated with the kitchen wastewater discharge pipeline. The biological substrate treatment units are filled with a naturally degradable biological substrate filler. The bottom and the side walls of the sedimentation tank and the biological substrate treatment units are impermeable structures. The tank walls of the biological substrate treatment units are provided with a plurality of sockets. The sockets are uniformly distributed in a rectangular array and sockets on corresponding tank walls are correspondingly arranged, and blocking rods are arranged between the corresponding sockets. The two adjacent sockets are separated by 1.0 m in the horizontal direction, and the two adjacent sockets are separated by 0.3 m in the vertical direction. The substrate enhancing treatment system is connected with the wetland absorption system through the communication pipeline, and the wetland absorption system includes a first-stage ecological wetland, a second-stage ecological wetland and a third-stage ecological wetland which are sequentially connected through the communication pipelines, and the upper part of the wetland absorption system is planted with vegetation, and the third-stage ecological wetland is connected with a clean water tank, and the clean water tank outputs water in the clean water tank through a clean water output pipeline.
1.1 Construction area of substrate enhancing treatment system LU504773
Total area formula of substrate enhancing treatment system:
Sa = N « V, = D/H, (1), where Sa is the total construction area (m?) of substrate enhancing treatment system; N is the maximum number of diners per day; Vs is the volume coefficient of the substrate enhancing treatment system for a single tourist, with a value of 0.1-0.25 m°; D is the retention time of wastewater in the substrate enhancing treatment system; Hs is the highest water level in the substrate enhancing treatment system.
In view of the fact that the maximum number of diners N is 100, and the peaks of wastewater load is concentrated in the summer when the wetland plants grow vigorously, while the discharge is not high at other times. The volume coefficient Vs of the substrate enhancing treatment system takes the average value of 0.18 m3, the hydraulic retention time D of wastewater in the substrate enhancing treatment system takes the value of 7d, and the highest water level Hs of the substrate tank takes the value of 2.5 m. According to formula (1), the construction area Sa of substrate enhancing treatment system is 50.4 m2. 1.2 Sedimentation tank and biological substrate treatment unit area and construction requirements
The sedimentation tank is connected with the biological substrate treatment units by polyvinyl chloride (PVC) pipelines with diameters of 5 cm, and the kitchen wastewater first flows into the sedimentation tank through the kitchen wastewater discharge pipeline and then flows out of the biological substrate treatment units in turn. And the water inlet of each tank is arranged at the bottom of one side wall, and the water outlet is arranged at the top of the other side wall, so that the water outlet and the water inlet of each tank are arranged diagonally. The bottom and side walls of sedimentation tank and biological substrate tank are hardened with cement, and the top of the sedimentation tank and biological substrate tank is hardened and sealed, but there is a working wellhead with a diameter of 60 cm. During the operation of the project, the wellhead of each substrate tank is closed with a manhole cover.
Because the substrate enhancing treatment system includes one sedimentatidrW504773 tank and three biological substrate treatment units connected in series end to end, the construction area ratio of sedimentation tank and biological substrate treatment units is set according to the area ratio of 1:4. In other words, the sedimentation tank area is 10.1 m2. The specifications of the three biological substrate treatment units are the same, with about 13.4 m? for each biological substrate treatment unit. 1.3 biological substrate input input formula of biological substrate:
W = Vx PB, (2), where W is the total amount of stalks (kg) put in by the biological substrate treatment units; V is the total volume of the substrate enhancing treatment system; Ps is the input coefficient of stalks per unit volume of wastewater, with a value of 20 - 30 kg/m°.
In view of the fact that the wastewater treatment project is located in a rice planting area and is rich in straw, the biological substrate treatment units choose straw as the substrate tank filler. The input coefficient Ps of biological substrate per unit volume of wastewater is 25 kg/m°, and the total volume V of substrate enhancing treatment system is 126 m3(50.4 m2x2.5 m). According to formula (2), the total input w of rice straw is 3150 kg. Among them, the input frequency of rice straw is 3 times/year, and each input amount is 1/3 of the total amount, that is, 1050 kg. 1.4 Parameters and construction requirements of wetland absorption system
Formula of total area of wetland absorption system:
Sp =N*P, (3), where Sp is the total area (m?) of the wetland absorption system, and N is the maximum number of diners per day; Pa is the wetland construction area coefficient of a single dining visitor, with a value of 1-2.5m°.
In view of the fact that the maximum number of diners n is 100, and the peak 60504773 wastewater load is concentrated in the summer when wetland plants grow vigorously, and the discharge is not high in other times, the area coefficient Pa of wetland construction is taken as 1 m2. According to formula (3), the total construction area Sp of ecological wetlands is 100 m2.
The first-stage ecological wetland, the second-stage ecological wetland and the third-stage ecological wetland are arranged in a series, which are connected by PVC pipelines. The water inlets of all levels of ecological wetlands are arranged at the bottom of one side wall, and the water outlets are arranged at the top of the other side wall, so that the water outlets and water inlets of each tank are arranged diagonally. The area ratio of first-stage ecological wetland, second-stage ecological wetland and third-stage ecological wetland is 3:3:4, that is, the first-stage ecological wetland is 30 m°, the second-stage ecological wetland is 30 m? and the third-stage ecological wetland is 40 m2. 1.5 Ecological Wetland Plant Configuration Requirements
Pontederia cordata L. (large emergent plants), Hydrocotyle vulgaris L. (small emergent plants) and Myriophyllum verticillatum L. (floating plants) are planted on the upper parts of the first-stage ecological wetland, second-stage ecological wetland and third-stage ecological wetland, respectively. The planting density is 8 plants of
Pontederia cordata L. per m2, 25 plants of Hydrocotyle vulgaris L. per m2 and 6 kg per m? of stems and leaves of Myriophyllum verticillatum L..
The water quality of the wastewater treatment effect of the agritainment resort was monitored by the kitchen wastewater treatment system of this embodiment for one year, and the results are shown in Table 1.
Table 1 LU504773
National urban
Index content pollution discharge (mg/L) standard
Removal
Month Pollutant | Wast Level 1 À | Level 1 B
Waste rate (%) ewat (mg/L) (mg/L) water er outlet inlet
Total 15 25.25 | 5.20 20 79.4 nitrogen
Ammoni 5 a 21.44 | 3.80 82.3 nitrogen
January | Total 0.5 phospho | 422 | 0.55 1 87.0 rus
Animal and 11.42 [1.32 | 1 3 88.4 vegetabl e oil
Total 15 30.53 | 3.36 20 89.0 nitrogen
Ammoni 5 a 26.42 | 2.38 91.0 nitrogen
April 9
Total 0.5 phospho 5.43 | 0.48 1 91.2 rus
Animal and 132 [121 |1 3 90.8 vegetabl
National urban LU504773
Index content Removal
Month Pollutant pollution discharge (mg/L) rate (%) standard
Total 15 26.72 | 3.20 20 88.0 nitrogen ammoni 5 a 22.5 | 2.87 87.2 nitrogen
July Total 0.5 phospho |541 | 0.39 1 92.8 rus
Animal and 12.71 0.91 |1 3 92.9 vegetabl eoil
Total 15 ; 30.32 | 3.03 20 nitrogen
Ammoni 5 a 28.93 | 2.60 91.0 nitrogen
October | Total 0.5 phospho 61 |0.48 1 92.1 rus
Animal and 14.7 | 1.1 1 3 92.5 vegetabl e oil
As can be seen from Table 1, the average contents of pollutant indexes COD, totaU504773 nitrogen, ammonia nitrogen, total phosphorus and animal and vegetable oil in the kitchen wastewater inlet are 114.9 mg/L, 28.2 mg/L, 24.8 mg/L, 5.29 mg/L and 13.1 mg/L respectively. The contents of COD, total nitrogen, ammonia nitrogen and total phosphorus in wastewater outlet after treatment are 11.8 mg/L, 3.7 mg/L, 2.91 mg/L, 0.48 mg/L and 1.13 mg/L, respectively, and the corresponding average removal rates of pollutants are 89.3%, 86.6%, 87.9%, 90.8% and 90.8%, respectively. On the whole, the treatment effect of COD, total nitrogen, ammonia nitrogen and total phosphorus pollutants in the engineering wastewater of this embodiment reaches the national level 1
A standard for urban wastewater discharge, while the treatment effect of animal and vegetable oil pollutants in wastewater reaches the national level 1 B standard for urban wastewater discharge.
To sum up, the invention has a good removal effect on COD, total nitrogen and total phosphorus in kitchen wastewater, especially for animal and plant wastewater oil with high content.
The above is only the preferred embodiment of the present invention, and it is not limited to the present invention. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An ecological treatment system for dispersed kitchen wastewater in rural areas, comprising a substrate enhancing treatment system and a wetland absorption system, wherein the substrate enhancing treatment system comprises one sedimentation tank and a plurality of biological substrate treatment units which are sequentially connected in series end to end through communication pipelines, the sedimentation tank is communicated with a kitchen wastewater discharge pipeline, the biological substrate treatment units are filled with a naturally degradable biological substrate filler, the substrate enhancing treatment system is connected with the wetland absorption system through a communication pipeline, the wetland absorption system comprise three or more than three ecological wetlands which are communicated by pipelines, and aquatic plants are planted on the water surface of the ecological wetlands; the total area of the substrate enhancing treatment system is determined according to the following formula (1): Sa = N « V, = D/H, (1), where Sa is the total construction area (m?) of substrate enhancing treatment system; N is the maximum number of diners per day; Vs is the volume coefficient of the substrate enhancing treatment system for a single tourist, with a value of 0.1-0.25 m°; D is the retention time of wastewater in the substrate enhancing treatment system; Hs is the highest water level in the substrate enhancing treatment system; the total area of the wetland absorption system is determined according to the following formula (3): Sp =N*P, (3), where Sp is the total area (m?) of the wetland absorption system, and N is the maximum number of diners per day; Pa is the wetland construction area coefficient of a single visitor, with a value of 1-2.5 m°.
2. The ecological treatment system for dispersed kitchen wastewater in rural ared$)504773 according to claim 1, wherein both the sedimentation tank and the biological substrate treatment units are regularly closed tanks, the bottom and the side walls of the tanks are impermeable structures, the total area ratio of sedimentation tank and biological substrate treatment units in the substrate enhancing treatment system is 1:4.
3. The ecological treatment system for dispersed kitchen wastewater in rural areas according to claim 1, wherein the biological substrate filler is one or more of rice straw, wheat straw and corn stalk.
4. The ecological treatment system for dispersed kitchen wastewater in rural areas according to claim 1, wherein an input amount of the biological substrate filler is determined according to the following formula (2): W = Vx PB, (2), where W is the total input amount of filler (kg) of the biological substrate treatment units; V is the total volume of the substrate enhancing treatment system; Ps is the input coefficient of filler per unit volume of wastewater, with a value of 20 - 30 kg/m°.
5. The ecological treatment system for dispersed kitchen wastewater in rural areas according to claim 1, wherein the aquatic plants in the ecological wetlands comprises large emergent plants, small emergent plants and floating plants arranged in sequence along the direction of wastewater self-flow and the planting area ratio of the large emergent plants, the small emergent plants and the floating plants is 3:3:4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504773A LU504773B1 (en) | 2023-07-20 | 2023-07-20 | Ecological treatment system for dispersed kitchen wastewater in rural areas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504773A LU504773B1 (en) | 2023-07-20 | 2023-07-20 | Ecological treatment system for dispersed kitchen wastewater in rural areas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU504773B1 true LU504773B1 (en) | 2024-01-22 |
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ID=89621325
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU504773A LU504773B1 (en) | 2023-07-20 | 2023-07-20 | Ecological treatment system for dispersed kitchen wastewater in rural areas |
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| LU (1) | LU504773B1 (en) |
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2023
- 2023-07-20 LU LU504773A patent/LU504773B1/en active
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