75results about How to "Ensure ecological safety" patented technology

The invention discloses a remote sensing estimation method for grassland vegetation coverage, which belongs to the field of remote sensing applications. The method includes the steps of field test data collection and processing, Modis satellite data download and processing, data analysis and modeling, and precision inspection. The present invention establishes the ground spectral model for predicting vegetation coverage and corrects the Modis spectral model through ground hyperspectral tests, which is different from the methods of directly using satellite remote sensing data or using simple visual estimation and instrumental measurement and calculation in other similar researches, which helps to improve the prediction Accuracy is conducive to the scientific management and rational utilization of grassland resources, and has important practical significance for correctly evaluating the real production status of grasslands and sustainable use of grassland resources.

The invention discloses a grassland dry matter mass remote sensing estimating method, which belongs to the field of remote sensing application. The method comprises the following steps of: collecting and processing field test data; downloading and processing Modis (Moderate Resolution Imaging Spectroradiometer) satellite data; analyzing and modeling the data and detecting the accuracy and the like. The method for establishing a ground spectrum model for predicating ground dry matter mass and correcting a Modis spectrum model through ground hyperspectral experiments is different from the method for directly predicating biomass liveweight by using NDVI (Normalized Difference Vegetation Index) data of the Modis remote sensing satellite in other like researches so that the grassland dry matter mass remote sensing estimating method is helpful for improving the predicating accuracy, is beneficial for scientific management and reasonable utilization of the grassland resources and has important practical significance in correct evaluation of the real productivity of the grassland and the sustainable use of the grass resources.

Disclosed are a method for processing rubbish percolating water and its system. The processing technique realizes the procession by combining the procession, biological processing technology and ecological procession. The system mainly comprises of adjusting pool, biological coagulation pool, high effective biological filtration pool, comprehensive ecological pool and so on. Compared with the present technology, it has rapid processing speed, high quality of water processed which can reach the first-class drainage standard, and can realize naugh drainage of waste water in rubbish processing factory.

The invention discloses a deep-layer infiltration method for apple orchards at dry highland areas through rainwater collected by tree disks. The deep-layer infiltration method comprises the following steps of selecting orchards; making deep-layer infiltration buckets for the collected by rainwater; trimming tree disks; burying the rainwater collection deep-layer infiltration buckets; and covering black mulching films. The deep-layer infiltration method disclosed by the invention has the beneficial effects that in the deep-layer infiltration method for the apple orchards at the dry highland areas through the rainwater collected by the tree disks, the black mulching films are covered, so that the water content of soil is effectively increased, the spring temperature and the summer temperature of the soil are effectively increased, and the microenvironment of the soil is effectively improved; the infiltration buckets of 40cm are buried, so that the water content of the soil below root layers is increased, the physical properties of the soil are changed, the growing environment of root systems is improved, water consumed for the growth of fruit trees in winter and spring drought seasons are compensated, drought stress on apple trees is small, the yield of a single plant is increased, the quality of 100 leaves of the apple trees is increased, the ratio of new shoots to short shoots is increased, the shape index of the fruit trees is increased, and the appearance of on-year and off-year of the apple trees is effectively prevented; and besides, water in rainy seasons can be effectively accumulated into deep layers, the trans-seasonal utilization of precipitation is realized, and the collected rainwater can also be used as a water soluble fertilizer for irrigation use.

The invention discloses a Bacillus alcalophilus SD 7903 with the preservation number of CGMCC No. 3158, belonging to the field of microbial technology; the invention also discloses a culture method thereof and an application in producing Ectoine. The Bacillus alcalophilus has higher Ectoine synthesis capability and is a strain of Gram positive bacteria, thus expanding biological resource utilization space and having good industrial application prospect in respect to production of Ectoine mainly by applying Gram negative bacteria in the current industry.

The invention discloses an in-situ soil remedying composite material capable of efficiently removing heavy metals. The in-situ soil remedying composite material comprises the following components: 10-20 parts of sodium persulfate, 5-10 parts of sodium polyepoxysuccinate, 1-5 parts of polyvinylpyrrolidone, 1-3 parts of nanocarbon, 1-5 parts of serpentine, 5-10 parts of lignite humate, 1-3 parts ofa surfactant, 4-8 parts of calcium dioxide, 4-8 parts of Chinese herbal residue, 1-3 parts of potassium permanganate, 1-5 parts of red mud particles, 1-5 parts of chitosan dithiocarbamate and 1-3 parts of methacryloyloxyethyl trimethylammonium chloride. The in-situ soil remedying composite material can remedy soil contaminated by various heavy metals (such as Pb, Cd, Cu, Zn, Cr and As) and toxic organic substances (such as chlorinated organic compounds, brominated organic compounds and antibiotics), reduces conditions of strong heavy metal activity and strong bioavailability in the soil, prevents transfer of the heavy metals from the soil to plants, prevents bioenrichment and amplification of the heavy metals, can efficiently remove the heavy metals such as chromium and mercury from the soil, and restores original functions of the soil, so that needs of agricultural development are met, and the ecological safety of crops and other plants is guaranteed, and the ecological risks of the bioamplification and the enrichment of the heavy metals to people are avoided.

The invention discloses a wireless alarming fire-extinction terminal monitor for forest fire. The terminal monitor is characterized in that temperature, moisture and smoke data in the forest can be automatically collected by the terminal monitor and is automatically and intelligently analysed and judged by the terminal monitor; once data exceeds the normal range, fire-extinction equipment is automatically started to extinct fire after the terminal monitor receives a fire-extinction order, thus, the forest fire is monitored in real time, and the forest fire can be automatically put off in time, thereby realizing the purpose of putting off fire as soon as finding the fire; and in the system, the solar cell plate is adopted to supply power in on need of manually erecting and maintaining power grids, which is more convenient for the terminal monitor to implement and apply.

The invention discloses a method for processing organic waste water, which comprises the following steps that: a cladding-typed iron-based material is prepared by utilizing organic plastic to incompletely wrap an iron-based material, and the cladding-typed iron-based material is arranged in organic waste water with the pH value of 3 to 7 to process; and the organic plastic is polyethylene, polypropylene or polyfluortetraethylene, and the iron-based material is zero-valent iron. The iron-based material has vast raw material source, low cost, simple production process, stable performance, environmental friendliness, high reaction efficiency, repeatability and long service life. The method can be used for processing water having different organic pollution, can be adjusted according to characteristics of typical organic pollutants in different industries and according to the local conditions, can overcome the weaknesses of the different traditional technologies, is convenient and easy to operate and has high efficiency.

The invention discloses a plant protection system and method for a multispectral fixed wing unmanned aerial vehicle matched with a plant protection unmanned aerial vehicle. The Plant protection systemand method for the multispectral fixed wing unmanned aerial vehicle matched with the plant protection unmanned aerial vehicle comprises a multispectral fixed wing unmanned aerial vehicle, a ground software analysis system and a plant protection unmanned aerial vehicle. The multispectral fixed wing unmanned aerial vehicle is provided with a multispectral imager on the fixed wing unmanned aerial vehicle. The fixed wing unmanned aerial vehicle is provided with a GPS locator. Four one-million-and-two-hundreds- thousand pixel narrow-band monochromatic sensors and a 16 million pixel RGB tricolor sensor are arranged on the multispectral imager. The four one-million-and-two-hundreds-thousand pixel narrow-band monochromatic sensors are a green light narrow-band monochromatic sensor, a red light narrow-band monochromatic sensor, a red edge light narrow-band monochromatic sensor, and a near-infrared narrow- band monochromatic sensor. A SD card slot facilitating to export data is formed in the multispectral imager. A plastic medicine box is carried on the plant protection unmanned aerial vehicle. The variations of land resources and crop groups are fully understood, the management measures and the amount of material inputs are accurately and accurately adjusted according to the specific conditions of each operation unit in a field Adapt to local conditions, so as to obtain the maximum economic benefit.

The invention discloses a Trichoderma harzianum strain, and its application in the control of potato late blight. The Trichoderma harzianum strain HNA-14 provided in the invention has a preservation number of CGMCC No.5990. The Trichoderma harzianum strain HNA-14 can be used for inhibiting pathogens, promoting the growth of potato plants, and controlling the potato late blight generation of the potato plants. The Trichoderma harzianum strain has a wide application prospect in the sustainable agriculture development.

The invention discloses a saline soil conditioner, comprising the following raw materials by weight percent in dry weight: 25-55% of oxalis corniculala, 30-55% of soybean straw, 5-15% of straw biochar and 10-25% of wheat bran. The components are mixed by the weight percent after being crushed, and fully mixed evenly. By adopting the saline soil conditioner, the required cost for improving saline soil can be reduced when an ecological and safe farmland environment is ensured, and the efficiency for improving the saline soil is improved.

The invention discloses a fertilizer special for organic cultivation of Camellia oleifera and a preparation method thereof. The fertilizer comprises the following raw materials: soybean meal, a calcium magnesium phosphate fertilizer, a potassium-magnesium sulphate fertilizer, tea bran of Camellia oleifera, zinc sulfate heptahydrate, borax, etc. The fertilizer is prepared by the following steps: crushing, sieving, fermentation, stirring, and uniform mixing. The fertilizer comprises the following raw materials in percentages by weight: 25-75% of the soybean meal, 5-52% of the tea bran of Camellia oleifera, 6-23% of the calcium magnesium phosphate fertilizer, 9-19% of the potassium-magnesium sulphate fertilizer, 0.1-2% of zinc sulfate heptahydrate, and 0.1-2% of borax. The fertilizer has a scientific and reasonable formula, weight percentages of the raw materials are adjusted according to growth conditions for preparing the special-purpose fertilizer, in order to equalize nutrition of Camellia oleifera, improve better growth of Camellia oleifera, and improve soil environment as well as quality and oil output of Camellia oleifera; the fertilizer is safe and does not have pollution.

The invention discloses a ridge type wet cultivation technology for paddy rice. The ridge type wet cultivation technology includes steps of (1), carrying out manure and rice rotation, sowing green manure in winters, to be more specific, planting astragalus sinicus or soybeans or oilseed rapes in slack seasons in winters, or returning straw to fields, combining land maintaining with land utilizing and biologically remedying the soil fertility; (2), forming ridges, directly sowing sprout rice, to be more specific, forming the ridges by means of water plowing and quantitatively directly sowing the sprout rice according to the ridges; (3), irrigating rice crops, to be more specific, managing water according to growth periods in a wet cultivation and dry management mode, controlling water consumption on the premise that physiological water requirements of the paddy rice are met, and only forming water layers for fertilization and pesticide application irrigation by the aid of natural rainfall instead of establishing water layers in the complete growth periods. The widths of the surfaces of the ridges range from 3 meters to 5 meters, and the widths and the depths of furrows respectively range from 0.3 meter to 0.5 meter. The ridge type wet cultivation technology has the advantages that lands can be maintained by the aid of the green manure, the paddy rice is subjected to ridge type wet cultivation, irrigation water consumption can be effectively controlled, cores of targets include production stabilization and cost economization and are supplemented by water conservation and land maintenance, accordingly, energy can be saved by the aid of the technology for the rice crops, environments can be protected by the aid of the technology for the rice crops, and the food and ecological safety can be guaranteed.

The invention relates to a preparation method of a compound microbial flocculant for cyanobacterial bloom. The preparation method comprises the following steps: respectively inoculating Serratia and Bacillus into a sterilized nutrient broth medium for culture; respectively taking out 1mL of bacterial liquids of Serratia and Bacillus after culturing for 24h, and inoculating into a sterilized fermentation medium for fermentation culture; treating a broth as a seed liquid after culturing for 72 h and carrying out complex culture for 72h under conditions of a culture temperature of 35 DEG C, a rotation speed of 160rpm, an initial pH of a medium of 8.0, and an inoculation amount of the seed liquid of 10 ml / L; and carrying out centrifugal separation on the broth, and taking out a supernatant liquor. So the compound microbial flocculant is obtained. The preparation method is simple, fast and low cost, the flocculant prepared in the invention has the advantages of small dosage in use, strong stability and easy storage, can effectively flocculate cyanobactreial water samples with a flocculation rate of 92%, and has an excellent application prospect.

The invention relates to an ethinyl estradiol high-efficiency degrading strain and a preparation method thereof. The thallus length of the strain is 0.4-0.8um; and the bacterial colony has a diameter of 1-2.5mm, is round in shape, has regular edges and a low convex surface, is golden yellow in color with no luster and no transparency, and appears as negative through Gram staining. The preparation method comprises the following steps: carrying out directional domestication and culture on active sludge, enriching, separating, and purifying to obtain the ethinyl estradiol high-efficiency degrading strain. The ethinyl estradiol high-efficiency degrading strain can effectively degrade ethinyl estradiol, has an ethinyl estradiol degradation rate up to 80% or above, has no resistance to common antibiotics, and can be inactivated easily, thereby ensuring the ecological safety in use. Besides, the ethinyl estradiol high-efficiency degrading strain has the advantages of easy acquisition of sources and convenient separation and purification method.

The invention provides a separation type Venturi tube hybrid electrocatalysis ozonizing method and device, and belongs to the technical fields of water treatment and environmental friendliness. The method is a novel pollutant removing process combining efficient dissolution of ozone and a carbon material three-dimensional transmission electrode, is economical and efficient, has a relatively high capability for removing insoluble novel pollutants (medicines and personal-care supply pollutants PPCPs, such as antibiotics, endocrine disrupting chemicals (EDCs), drinking-water disinfection by-products (DBPs), perfluoro organic compounds representative compounds perfluorooctane sulfonate (PFOS) and perfluorooctanic acid (PFOA), brominated flame retardant polybrominated diphenyl ethers (PBDEs) and the like), and has complete removing effect. In the effluent treated by the method, a target pollutant mineralization removal rate is higher than 90 percent, and the water quality safety can be guaranteed.

The invention provides an Ethereum phishing account detection method based on deep learning, and the method combines transaction time and weight features, enables an Ethereum transaction network to be modeled into a time sequence weighted directed graph, and can effectively capture the properties of a more comprehensive dynamic transaction network. Then, a ski-gram model is adopted to obtain graph embedded feature vectors of all account nodes in the time sequence weighted directed graph, and compared with traditional manual features, the graph embedded feature vectors obtained by the model can adaptively capture implicit features among all accounts; and finally, the obtained graph embedding feature vector is input into a classifier, the classifier effectively combines a k-means clustering algorithm in unsupervised learning and a support vector machine algorithm in supervised learning, and a more robust phishing account classification result can be obtained under the condition of a small amount of label data. According to the method provided by the invention, the phishing accounts can be accurately classified from a large number of accounts, and the ecological security of the Ethereum transaction platform is ensured.

The invention provides an estuary ecological water requirement estimation method based on the response of shellfish coupled biomarkers and belongs to the field of estuary ecological water requirement calculation. The estuary ecological water requirement estimation method comprises the following steps: selecting a type of shellfish scattered within a wide range as the experimental subjects, setting different salinity regions according to a local actual salinity scope, and taking the normal salinity of the estuary as a control salinity region; throwing equal shellfish to the set different salinity regions, measuring the antioxidant system enzyme activity values of samples collected at different points in time and screening out enzyme activity indexes having remarkable response to salinity change; next, standardizing the well-chosen antioxidant enzyme activity values by use of a novel coupled biomarker response method before coupling and determining the salinity region having remarkable difference as a biological response threshold range; and finally, estimating the biological ecological water requirement by use of the difference value of the biological response threshold range and the normal salinity concentration. According to the estuary ecological water requirement estimation method based on the response of the shellfish coupled biomarkers, the shellfish, namely the species having poor motility, is selected and the interference risk is reduced; meanwhile, the research level is promoted to the molecular level and the accuracy of the estuary ecological water requirement calculation is improved.

The invention relates to a method for preparing an ibuprofen-degrading bacterial agent, which comprises the following steps of: (1) inoculating activated sludge in a secondary sedimentation tank of a sewage treatment plant into a culture medium, domesticating by using a gradient pressure domestication method, standing, taking an upper-layer water sample, gradually diluting, streaking for separation, culturing, purifying, inoculating the separated strain into a beef extract peptone culture medium, and performing shake culture until a logarithmic phase; and (2) inoculating the cultured strain into the culture medium to prepare the ibuprofen-degrading bacterial agent. The method has the advantages of simpleness and low cost; and the prepared ibuprofen-degrading bacterial agent has the advantages of convenient use, high efficiency of degrading ibuprofen, easy inactivation of the strain, and application to ibuprofen removal in water treatment.

The invention discloses an Edwardsiella tarda high-efficiency virulent bacteriophage vBEtaMIME523 and an application thereof, and relates to biological treatment of Edwardsiella tarda pollution and infection. The vB_EtaM-IME523 is preserved in the General Microbiological Culture Collection Center, and the preservation number of the vB_EtaM-IME523 is CGMCC No. 18191. The vB_EtaM-IME523 is providedwith an icosahedron approximately spherical head, the diameter of the icosahedron approximately spherical head is 95nm, the vB_EtaM-IME523 is provided with a shrinkable tail with the length being 125nm; the vB_EtaM-IME523 can form transparent plaque on a bacteria plate of the Edwardsiella tarda, and can be used for cracking the Edwardsiella tarda to clarify bacteria liquid; and the vB_EtaM-IME523has an obvious protection effect on animals. The application of the vB_EtaM-IME523 is used for specifically inhibiting and killing Edwardsiella tarda.

The invention relates to the technical field of improvement of saline land, and discloses a formula of a compound improving agent for planting of allium polyrhizum in saline land. The formula consists of the following raw materials in parts by weight: 30 parts of humic acid, 150 parts of desulfurizing gypsum, 18 parts of residue of furfural, 12 parts of ferrous sulfate, 25 parts of calcium superphosphate, 110 parts of ammonium sulfate, 10 parts of calcium nitrate, 50 parts of urea, 65 parts of plant ash, and 20 parts of fly ash. The formula has the advantages that the soil environment of saline land is effectively improved, the salt content of saline land is greatly reduced, the PH (potential of hydrogen) value in soil is reduced, the content of nutrient matter required in the planting process of alkali scallion is greatly increased, the cost of used raw materials is low, the preparation is convenient, the survival rate of allium polyrhizum in saline land is greatly increased, and the diet condition of local residents is improved.

The invention relates to an advanced treatment and reuse method for bio-chemical effluent of chemical wastewater. The advanced treatment and reuse method comprises the following steps: (1) using a spraying-suspending polymerization method to prepare magnetic resin with high capacity of Fe3O4; (2) performing advanced treatment on the bio-chemical effluent of the chemical wastewater with the magnetic resin prepared in step (1), adding 3-5mmol / L of H2O2 into the bio-chemical effluent of the chemical wastewater, and performing a mixing reaction for 60-600min; (3) performing solid-liquid separation on mixed wastewater treated in step (2) and disinfecting the separated bio-chemical effluent of the chemical wastewater. According to the advanced treatment and reuse method for the bio-chemical effluent of the chemical wastewater, persistent organic pollutants in the wastewater can be effectively removed, and the toxicity of the persistent organic pollutant is reduced, so that the standard requirement of reusing water quality is met, and the ecological security in a reusing process of the wastewater can be ensured.

The invention discloses a compound fertilizer special for tea-oil tree cultivation and a preparation method thereof. The fertilizer is prepared from, by weight, 15%-35% of beam pulp, 10%-25% of calcium magnesium phosphate fertilizer, 9%-19% of potash magnesium sulphate fertilizer, 15%-45% of tea-oil tree pulp, 15%-25% of walnut pulp, 9%-19% of manure of livestock and poultry, 0.1%-2% of heptahydrate and 0.1%-2% of borax through smashing, screening, fermentation, stirring and uniform mixing. The formula is scientific and reasonable, the compound fertilizer special for tea-oil tree cultivation is prepared by blending the weight percent of the raw materials according to the soil condition of Yuexi Country to balance the nutrition of oil tea, oil-tea trees are promoted to grow better, meanwhile, the soil environment is improved, the quality and oil output of the oil-tea trees are improved, and the compound fertilizer is safe and free of pollution.

The invention discloses a method for repairing plant community structure of Alternanthera philoxeroides invasive slash in Caohai wetland, and particularly relates to the field of Caohai wetland treatment. The method is specifically a method of using native plants of economic or ecological value to replace foreign invasive plants according to the successive law of plant communities, wherein the replacement plants include native species naturally distributed in the Caohai lake, such as Scirpus tabernaemontani, Scirpus yagara, Zizania latifolia, Juncellus serotinus and Leersia hexandra. A specific method of constructing communities includes: S1, constructing plant communities in a riparian area, with Juncellus serotinus community and Leersia hexandra community subjected to grid planting; S2,constructing plant communities in a shallow water area, with Scirpus tabernaemontani community and Scirpus yagara community subjected to belt planting; ad S3, constructing a plant community in a deepwater area, with Zizania latifolia community subjected to belt planting. According to the method, different plants are planted in water areas with different depths, the invasion of Alternanthera philoxeroides can be effectively inhibited, the species diversity of wetland plant communities is restored, and the stability of the wetland ecosystem and the ecological safety of the Caohai wetland are guaranteed.

The invention discloses a plant of pseudomonad and the application thereof in the biological removal of nitrogen heterocyclic compound. The pseudomonad adopts Pseudomonas sp. BC001 CGMCC NO.2223. The strain not only can utilize quinoline as a sole carbon source and a nitrogen source to perform metabolism, but also can well grow under the condition of highly concentrated pyridine and quinoline double stroma (pyridine is about 400 mg / L, quinoline is about 500 mg / L). The removal of the invention to the pyridine mainly passes through the biological absorption, the removal to the pyridine comprises two phases of biological absorption and biological degradation, and simultaneously, the additional carbon source with proper amount has the acceleration function to the pyridine degradation. Through the detection, the intermediate product of the pyridine degradation mainly adopts 2-hydroxyquinoline and 8-hydroxyl coumarin, the main end product adopts NH 4 <+>. BC001 bacteria have no resistance to penbritin, kanamycin sulfate, chloromycetin, cyclomycin and spectinomysin, and the used ecological security is ensured.

The invention discloses a sustainable flexible slope protection method and system for soft sandstone high and steep slope vegetation greening, and the method comprises the steps: digging a slope top intercepting ditch which is used for intercepting rainfall runoff of a slope top; the slope surface is sprayed, and a corrosion-resistant seepage-control layer with a certain thickness and micropores is formed through the seepage and wrapping effects; laying a layer of fine steel wire mesh on the soft sandstone slope surface to control infiltration; 2, two layers of continuous vegetation bags are laid, then the vegetation base material is injected through mechanical pressure feeding equipment, the vegetation bags are in a saturated state, and the tightness between the vegetation bags is guaranteed; the vegetation bag and the steel wire mesh are fixed through fixing pieces; a waterproof retaining wall is built at the bottom of the slope surface; slope drainage ditches are arranged to converge part of rainwater runoff from the slope surface and the slope bottom; vegetation is planted on the slope surface, and later maintenance is conducted. According to the method, an integral multi-layer flexible slope protection structure is formed on the whole, corrosion resistance protection can be effectively conducted on the soft sandstone high and steep slope, and sustainable treatment and repairing can be achieved through surface greening.

The invention discloses a special compound fertilizer for Edgeworthia chrysantha cultivation and a preparation method thereof. The fertilizer is prepared by pulverizing, screening, fermenting, stirring and uniformly mixing the following raw materials in percentage by weight: 20-45% of bean pulp, 30-45% of oil tea pulp, 10-25% of calcium magnesia phosphate fertilizer, 9-19% of potassium sulfate magnesium fertilizer, 35-35% of walnut pulp, 10-21% of livestock / poultry manure, 0.1-2% of white vitriol and 0.1-2% of borax. The formula is scientific and reasonable; the special fertilizer is prepared by blending the raw materials in percentage by weight according to the soil situation in Yuexi County; and the special fertilizer is capable of balancing the nutrients of the Edgeworthia chrysantha and promoting better growth of the Edgeworthia chrysantha, improves the soil environment, enhances the Edgeworthia chrysantha quality and blooming quantity, and is safe and pollution-free.

The invention discloses an ecological unit control method and device for urban rainwater runoff pollutants. The method includes separating garbage and suspended substances in rainwater runoff by a solid-liquid separation device; pumping the rainwater runoff into a sewage treatment tank; precipitating and decomposing harmful substances in sewage by the sewage treatment tank; discharging the purified rainwater to a water seepage layer; and finally filtering and purifying the rainwater by the water seepage layer. The device comprises the solid-liquid separation device, the sewage treatment tank and the water seepage layer, wherein the solid-liquid separation device comprises an outer barrel shell, a motor, a rotary shaft and a rotary hollow barrel. The separation of the rainwater runoff fromlarge particle solids is adopted, then the harmful substances such as phosphorus, nitrogen and the like are removed in the rainwater runoff by an aeration biological tank, and finally, phenol, cyanogen and sulfide in water are removed by a photo-oxidation reaction and a flocculation reaction of a three-stage treatment tank, so that the water seepage layer not only filters the rainwater, but also avoids soil erosion.