37results about How to "Reduce heavy metal toxicity" patented technology

The invention provides a method for plant-microbial remediation of heavy-metal polluted soil. The method includes the steps: A preparing mycorrhizal fungus inoculants; B performing symbiotic culture on the mycorrhizal fungus inoculants and seeds of host plants; C transplanting young seedlings into the heavy-metal polluted soil; D performing harvest after the growing period of the host plants finishes. According to the method, growth of the host plants is simulated under facilitation of the natural soil conditions, tolerance of the host plants for toxic substances is improved, various heavy metals in the soil are adsorbed, the content of the heavy metals in the soil is greatly reduced, remediation cost is remarkably reduced, remediation cycles are shortened, and the method has an excellent remediation effect on moderate or severe heavy-metal pollution.

The invention discloses an organic selenium-enriched liquid fertilizer and a preparation method thereof. The organic selenium-enriched liquid fertilizer comprises the following components in percentage by weight: more than or equal to 10 percent of total animal keratin hydrolyzed amino acid, 0.1 to 3 percent of organic selenium in terms of selenium, 2 to 3 percent of surfactant, more than or equal to 1.0 percent of trace element zinc required by plants, more than or equal to 1.0 percent of boron, and the balance of water. The invention also provides the preparation method of the organic selenium-enriched liquid fertilizer. The organic selenium-enriched liquid fertilizer is safe in production and application, can improve the selenium absorption efficiency of farm crops and improve disease and insect resisting, drought and flood resisting and yield increasing capacities of the farm crops, has the characteristics of supplementing the selenium, improving the fruit quality of the farm crops and reducing heavy metal toxicity, and has a storage life of 3 years without deterioration.

The invention relates to the technical field of heavy metal remediation of farmland, in particular to a foliar fertilizer, a preparation method and a method for reducing cadmium pollution of crops andaims to reduce the content of heavy metal cadmium in edible parts of crops. The foliar fertilizer is prepared from the following raw materials: 5-10 parts of soluble selenium, 60-80 parts of solublesilicon, 5-10 parts of chitosan, 20-30 parts of ascorbic acid, 140-160 parts of deionized water and 2-5 parts of absolute ethanol. According to the foliar fertilizer, a new idea that the inhibitor issprayed to foliage of crops for inhibiting transfer of heavy metals from the crop section of a soil-plant system to edible parts so as to remedy heavy metal pollution of cultivated land is provided.

The present invention discloses a biological treatment mineralization ecological system for sludge. Said system includes artificial wetland bed which is a pool-shaped structure with four walls, on the four walls and bottom portion a water-proofing layer is respectively laid, on the water-proofing layer a filling material layer is set, said filling material layer includes coarse river sand and turf mixed layer, rice straw layer, large grain size broken stone layer and small grain size broken stone layer which are successively distributed from top to bottom. On the coarse river sand and turf mixed layer several slurry transmission pipes are horizontally laid, in the bottom portion of artificial wetland bed several water discharge pipes are horizontally laid, on the filling material layer the wetland plants can be planted, in its interior the microbe can be added.

The invention provides a method for preparing color blocking layers of liquid crystal display panels. The method includes steps of respectively preparing red quantum dots, yellow quantum dots and green quantum dots; mixing the red quantum dots, the yellow quantum dots and the green quantum dots with one another, dissolving the red quantum dots, the yellow quantum dots and the green quantum dots and centrifugally purifying and treating the red quantum dots, the yellow quantum dots and the green quantum dots to obtain solution of white quantum dots obtained after the red quantum dots, the yellow quantum dots and the green quantum dots are mixed with one another; respectively treating solution of the red quantum dots, solution of the yellow quantum dots, solution of the green quantum dots and the solution of the white quantum dots to obtain red photosensitive dispersion liquid, yellow photosensitive dispersion liquid, green photosensitive dispersion liquid and white photosensitive dispersion liquid; coating the red photosensitive dispersion liquid, the yellow photosensitive dispersion liquid and the green photosensitive dispersion liquid on glass substrates according to preset rules and forming the color blocking layers of the liquid crystal display panels by the aid of exposure and development manufacturing processes. The method has the advantages that the brightness and color expressive force of liquid crystal displays can be effectively improved by the aid of the method, and the color gamut of the liquid crystal displays can be effectively expanded by the aid of the method.

The invention relates to a Chinese herbal medicine preparation for treating a white head-mouth disease of xiphophorus helleri. The invention further relates to a preparation method of the Chinese herbal medicine preparation for treating the white head-mouth disease of the xiphophorus helleri. The Chinese herbal medicine preparation for treating the white head-mouth disease of the xiphophorus helleri is prepared from, by mass, 25-33 parts of aqueous extract of garden burnet roots, 22-28 parts of common cephalanoplos herb juice, 7-14 parts of pu-erh ripe tea, 20-26 parts of bitter herbs, 19-26 parts of cluster mallow, 15-23 parts of morning glories, 19-25 parts of spica prunellae, 21-28 parts of Chinese honeylocust fruit, 17-25 parts of rhizoma atractylodis, 17-23 parts of Chinese milk vetch, 13-22 parts of heartleaf houttuynia herbs, 16-24 parts of honeysuckle flowers, 16-24 parts of common cnidium fruit, 14-22 parts of Chinese gall, 15-24 parts of pagoda tree fruit and the like. The Chinese herbal medicine preparation for treating the white head-mouth disease of the xiphophorus helleri can effectively treat the white head-mouth disease of the xiphophorus helleri.

The invention discloses a method for stabilizing heavy metal lead in bottom mud by virtue of a chlorapatite-loaded charcoal composite material. The method comprises the step of carrying out vibration on the chlorapatite-loaded charcoal composite material and lead-containing bottom mud, so as to finish the stabilization of the lead-containing bottom mud, wherein the chlorapatite-loaded charcoal composite material contains charcoal and chlorapatite, and charcoal is loaded with chlorapatite. The method for stabilizing heavy metal lead polluted bottom mud by virtue of the chlorapatite-loaded charcoal composite material has the advantages of good stabilization effect, simplicity and convenience in operation, low in cost, cleanness, no pollution and high practical application value and can be directly utilized in actual field remediation.

The invention relates to a Chinese herbal medicine feed additive for preventing ichthyophthiriasis of dragonfish and further relates to a preparation method of the Chinese herbal medicine feed additive for preventing ichthyophthiriasis of dragonfish. The Chinese herbal medicine feed additive for preventing ichthyophthiriasis of dragonfish is prepared from, by mass, 15-22 parts of Chinese honeylocust fruit juice, 15-22 parts of calamendiol, 15-22 parts of folium artemisiae argyi, 10-18 parts of torilis japonica, 7-12 parts of pu-erh ripe tea, 10-16 parts of morning glory, 10-16 parts of herba houttuyniae, 8-18 parts of folium isatidis, 12-16 parts of gallnut, 12-18 parts of Chinese thorowax roots, 13-16 parts of garlic, 11-16 parts of coptis chinensis, 7-15 parts of milk vetch, 7-15 parts of fresh ginger, 8-13 parts of cortex phellodendri, 8-13 parts of moutan bark, 9-14 parts of resurrection lily rhizome, 6-13 parts of fructus cnidii and the like. The Chinese herbal medicine feed additive can decrease the morbidity of ichthyophthiriasis of dragonfish.

The invention discloses an anti-radiation vital energy tonifying electuary. The electuary is prepared mainly from the following raw materials in parts by weight: 35-55 parts of puer tea, 12-18 parts of astragalus membranaceus, 8-12 parts of medlar, 6-8 parts of fried jujube kernel, 7-10 parts of cape jasmine, and 8-12 parts of radix pseudostellariae. The electuary has the characteristics of good anti-radiation effect and convenience in portability, can play the effect of quick radiation resistance to whole body under the action of oral administration, can be used for strengthening immunity, reducing blood sugar and beautifying, and has a main function of tonifying qi and nourishing blood. Furthermore, puer tea which is common in local areas is used as a main raw material, so that the electuary is a traditional Chinese medicinal preparation which has tea fragrance, can resist radiation, and can be used for tonifying qi and blood when being prepared from the puer tea and other medicinal materials.

The invention relates to a live fish transportation stress repairing agent and a preparation method thereof, and belongs to the technical field of aquaculture and water quality improvement. The live fish transportation stress repairing agent consists of the following raw materials in parts by weight: 100-200 parts of dried ginger powder, 700-850 parts of sodium thiosulfate and 100-150 parts of zeolite powder. The live fish transportation stress repairing agent provided by the invention is low in cost, high in efficiency and rapid in effect taking, and is capable of effectively preventing ammonia nitrogen pollution in the transportation process, improving fish immunity and increasing the transportation survival rate.

The invention discloses a preparation method of a selenium-rich high protein active peptide additive. The method includes: subjecting feed grade sodium selenite and a yeast dry powder solution to fermentation reaction to prepare organic liquid selenium yeast, conducting mixed fermentation on the organic selenium yeast, fermented chicken manure, feather meal, meat and bone meal, eggshell, an enzymepreparation, molasses and the like, controlling the water content of the obtained fermented material at about 70% and breeding housefly larvae for a period of time, then getting the housefly larvae out and performing washing, then subjecting the washed housefly larvae and liquid selenium yeast to mixed fermentation for 24h to obtain a selenium-rich high protein active peptide extracted liquid, using feed grade calcium powder for adsorption, employing a heat pump for drying, and conducting milling to 300-800 mesh, thus obtaining the selenium-rich high protein active peptide additive raw material. The selenium-rich high protein active peptide additive prepared by the method provided by the invention has the advantages of: safety, no residue and no pollution, is a green feed and fertilizer additive capable of replacing antibiotics and pesticides, and has broad application prospects.

The present invention discloses a resource treatment method for urban sludge, which comprises the following steps of: ultrasonically treating the urban sludge, transferring to an expander, sealing, heating until the internal gas temperature reaches 120-160 DEG C and the pressure reaches 2-5 atm, opening the extruder cover, cooling to room temperature and taking out the sludge. The resource treatment method achieves the volume reduction and dewatering of the urban sludge, improves the combustion value of the sludge, simultaneously reduces the secondary pollution of heavy metals, pathogens and other harmful substances in the urban sludge, and achieves volume reduction, harmlessness and resource treatment of the urban sludge.

The invention relates to a traditional Chinese medicinal herbal preparation for treating ichthyophthiriasis of osteoglossum bicirrhosum, and relates to a preparation method of the traditional Chinese medicinal herbal preparation. The preparation is prepared from the following components in parts by mass: 22-34 parts of gleditsia sinensis juice, 15-22 parts of calamus, 15-22 parts of folium artemisiae argyi, 10-18 parts of torilis japonica, 7-12 parts of Pu-erh ripe tea, 10-16 parts of morning glory, 10-16 parts of herba houttuyniae, 8-18 parts of folium isatidis, 12-16 parts of Chinese gall, 12-18 parts of radix bupleuri, 13-16 parts of garlic, 11-16 parts of coptis chinensis, 7-15 parts of astragalus smicus, 7-15 parts of raw ginger, 8-13 parts of cortex phellodendri, 8-13 parts of moutan bark, 9-14 parts of rhizoma kaempferiae, 6-13 parts of fructus cnidii, 6-10 parts of bamboo salt, 5-11 parts of white vinegar and 5-11 parts of peppermint oil. The traditional Chinese medicinal herbal preparation has a high cure rate on the ichthyophthiriasis of osteoglossum bicirrhosum.

The invention relates to a Chinese herb feed additive for preventing a bacterial gill-rot disease of fancy carps and a preparation method thereof. The Chinese herb feed additive for preventing the bacterial gill-rot disease of the fancy carps is prepared from, by mass, 23-34 parts of onion juice, 20-28 parts of dandelion, 18-25 parts of wahlenbergia marginata, 18-25 parts of calamus, 17-25 parts of Chinese pulsatilla roots, 16-22 parts of folium artemisiae argyi, 16-22 parts of cortex mori, 12-19 parts of torilis japonica, 6-13 parts of Pu-erh ripe tea, 15-24 parts of serrate rabdosia herbs, 9-14 parts of semen oroxyli, 6-13 parts of herba violae, 8-13 parts of calyx seu fructus physalis, 6-11 parts of mint oil, 18-29 parts of dried earthworm powder, 6-12 parts of fish oil and the like. The feed additive has the good preventing effect on the bacterial gill-rot disease of the fancy carps.

The invention discloses a preparation method of a soil Cd and Pb repairing agent. The preparation method comprises the following steps: (1) preparing corn straw biochar powder; (2) performing hydrothermal treatment on the charcoal powder by using a mixed aqueous solution of a zoysia japonica-sedum alfredii hance composite extract, sodium diethylhexyl sulfosuccinate and magnesium chloride; (3) soaking in an aqueous solution of potassium glutamate, citric acid, trimethylpyruvic acid and phenylethylamine; (4) soaking in a mixed aqueous solution of phosphoric acid and sodium pyrophosphate; and (5)performing hydrogen peroxide soaking. The soil repairing agent prepared through the method is good in stabilizing effect on Cd and Pb, Cd and Pb in treated soil are remarkably converted from an acid-soluble state to a residue state, and the toxicity of heavy metals in the soil is obviously reduced.

The invention discloses an organic selenium-enriched liquid fertilizer and a preparation method thereof. The organic selenium-enriched liquid fertilizer comprises the following components in percentage by weight: more than or equal to 10 percent of total animal keratin hydrolyzed amino acid, 0.1 to 3 percent of organic selenium in terms of selenium, 2 to 3 percent of surfactant, more than or equal to 1.0 percent of trace element zinc required by plants, more than or equal to 1.0 percent of boron, and the balance of water. The invention also provides the preparation method of the organic selenium-enriched liquid fertilizer. The organic selenium-enriched liquid fertilizer is safe in production and application, can improve the selenium absorption efficiency of farm crops and improve disease and insect resisting, drought and flood resisting and yield increasing capacities of the farm crops, has the characteristics of supplementing the selenium, improving the fruit quality of the farm crops and reducing heavy metal toxicity, and has a storage life of 3 years without deterioration.

The invention relates to a feed additive preventing the scale protrusion disease of pterophyllum and a preparation method thereof. The feed additive preventing the scale protrusion disease of pterophyllum is prepared from, by mass, 28-35 parts of cactus juice, 19-25 parts of oenanthe stolonifera, 19-23 parts of aqueous extracts of garden burnet, 10-18 parts of cooked puerh tea, 18-23 parts of morning-glory, 17-23 parts of Japonese pearlwort herbs, 16-22 parts of mazus japonicus, 15-21 parts of common cephalanoplos herbs, 14-20 parts of cocklebur fruits, 14-18 parts of selfheal, 12-19 parts of black nightshade, 12-18 parts of polygonum multiflorum, 12-18 parts of roots of bidentate achyranthes, 9-16 parts of rubus pluribracteatus roots, 9-16 parts of aletris lanuginosa bureau et Franch, 7-15 parts of nettlesand the like. The feed additive preventing the scale protrusion disease of pterophyllum can effectively prevent the scale protrusion disease of pterophyllum and improve the immunity of pterophyllum.

The invention discloses a tea cream capable of resisting radiation and tonifying heart and spleen. The tea cream is mainly prepared from the following raw materials in parts by weight: 30-45 parts of Pu'er tea leaves, 15-20 parts of yam, 12-15 parts of astragalus membranaceus, 5-9 parts of codonopsis pilosula, 6-8 parts of polygonum multiflorum and 4-7 parts of fructus psoraleae. The tea cream disclosed by the invention has the characteristics of being good in radiating resisting effect and convenient to carry; the tea cream, which is internally taken, can rapidly take an effect of resisting the radiation for the whole body, and has functions of increasing immunity, reducing blood sugar and beautifying; most importantly, the tea cream can tonify the heart and the spleen, build body, and relieve insomnia, nervousness, palpitation and other symptoms caused by heart-spleen deficiency; the traditional Chinese medicinal tea cream, which is mainly prepared from the common Pu'er tea leaves as well as other medicinal materials, not only can reserve a tea fragrance, but also can resist the radiation and can tonify the heart and the spleen.

The invention relates to a Chinese herbal medicine preparation for treating a bacterial gill-rot disease of cryprinus carpiod, and further relates to a preparation method of the Chinese herbal medicine preparation for treating the bacterial gill-rot disease of the cryprinus carpiod. The Chinese herbal medicine preparation for treating the bacterial gill-rot disease of the cryprinus carpiod provided by the invention is prepared from the following components in parts by weight: 23-34 parts of onion juice, 20-28 parts of dandelion, 18-25 parts of wahlenbergia marginata, 18-25 parts of acorus calamus, 17-25 parts of pulsatilla chinensis regel, 16-22 parts of folium artemisiae argyi, 16-22 parts of cortex mori radicis, 12-19 parts of Xiaoqiecao, 6-13 parts of cooked puerh, 15-24 parts of serrate rabdosia herb, 15-21 parts of shepherd's purse, 13-20 parts of folium isatidis, 11-18 parts of purslane, 12-18 parts of Chinese gall, 11-16 parts of Indian kalimeris herb, 8-18 parts of common cephalanoplos herb, 9-17 parts of creeping oxalis and the like. The Chinese herbal medicine preparation provided by the invention is high in recovery rate on the bacterial gill-rot disease of the cryprinus carpiod.

The invention discloses a preparation method of an anti-radiation electuary capable of replenishing qi and blood. The electuary is prepared by the following raw materials by a weight ratio: 35-55 parts of Pu'er tea leaves, 12-18 parts of Radix Astragali, 8-12 parts of matrimony vine, 6-8 parts of fried jujube, 7-10 parts of cape jasmine and 8-12 parts of radix pseudostellariae. The anti-radiation electuary capable of replenishing qi and blood has characteristics of good radiation prevention effect and convenient carrying, under oral administration effect, the radiation prevention effect for whole body can be affected rapidly, immunity is enhanced, blood sugar is reduced, beauty treatment is realized, and functions of replenishing qi and enriching blood can be realized. According to the invention, locally-common Pu'er tea leaves can be taken as a main raw material, by cooperating with other medicinal materials, the traditional Chinese medicine preparation having tea fragrance capable of replenishing qi and blood can be prepared.

The invention discloses an anti-radiation electuary capable of replenishing qi and blood. The electuary is prepared by the following raw materials by a weight ratio: 35-55 parts of Pu'er tea leaves, 12-18 parts of Radix Astragali, 8-12 parts of matrimony vine, 6-8 parts of fried jujube, 7-10 parts of cape jasmine and 8-12 parts of radix pseudostellariae. The anti-radiation electuary capable of replenishing qi and blood has characteristics of good radiation prevention effect and convenient carrying, under oral administration effect, the radiation prevention effect for whole body can be affected rapidly, immunity is enhanced, blood sugar is reduced, beauty treatment is realized, and functions of replenishing qi and enriching blood can be realized. According to the invention, locally-common Pu'er tea leaves can be taken as a main raw material, by cooperating with other medicinal materials, the traditional Chinese medicine preparation having tea fragrance capable of replenishing qi and blood can be prepared.

The invention discloses an organic bacterial fertilizer for the restoration of manganese ore-polluted soil, as well as a preparation method thereof. The organic bacterial fertilizer comprises the following raw materials in parts by mass: 3-5 parts of basic nutrient solution, 20-25 parts of remissive complex organic raw materials, 70-75 parts of water retention media and 3-5 parts of anti-manganese complex microbial agent. The preparation method comprises the mixing and fermentation steps. The organic bacterial fertilizer for the restoration of manganese ore-polluted soil has the effects that the soil structure is modified, the water retention and constant temperature can be achieved, the toxicity of heavy metals around roots can be reduced, the survival rate of plants can be increased, and the growth of plants can be promoted; in addition, the toxicity of manganese elements in the soil of plant roots can also be effectively relieved, the effect of the organic fertilizer can be enhanced, and the restoration capability of plants can be enhanced.

The invention discloses an anti-radiation electuary capable of replenishing qi and blood and a preparation method thereof. The electuary is prepared by the following raw materials according to a weight ratio: 35-55 parts of Pu'er tea leaves, 12-18 parts of radix astragali, 8-12 parts of Chinese wolfberry fruit, 6-8 parts of fried jujube kernels, 7-10 parts of cape jasmine and 8-12 parts of radix pseudostellariae. The anti-radiation electuary capable of replenishing qi and blood has characteristics of good radiation prevention effect and convenient carrying, under oral administration effect, the radiation prevention effect for the whole body can be affected rapidly, immunity is enhanced, blood sugar is reduced, beauty treatment is realized, and functions of replenishing qi and enriching blood can be realized. According to the invention, locally-common Pu'er tea leaves can be taken as a main raw material, by cooperating with other medicinal materials, the traditional Chinese medicine preparation having tea fragrance capable of replenishing qi and blood can be prepared.

The invention discloses a fat-reducing, anticancer anti-aging hawthorn coarse cereal health-preserving food. The food is prepared from the following raw materials in weight proportions: hawthorn, oat,black rice, buckwheat, phaseolus calcaratus, corns, red dates, sweet potatoes, Chinese wolfberries, Pu-erh tea, brown sugar, sodium benzoate and food glue. The food has the effects of disease resistance, complete and rich nutrition, good absorption, anti-aging and blood fat reduction. Hawthorn products can enhance appetite, improve sleep, keep constant calcium in bones and blood and prevent atherosclerosis when being eaten frequently; the oat is used as a medicine since ancient times, has sweet and warm nature, and has the effects of tonifying spleen and stomach, smoothing intestine, promoting bowel circulation, stopping deficiency sweat, stopping bleeding and the like; and the Pu-erh tea has the more than 20 effects of warming stomach, losing weight, reducing blood fat, preventing arteriosclerosis, preventing coronary heart disease, lowering blood pressure, resisting aging, resisting cancer, reducing blood sugar, inhibiting bacteria, diminishing inflammation, reducing tobacco toxicity, reducing heavy metal toxicity, resisting radiation, preventing dental caries, improving eyesight, assisting digestion, resisting toxicity, preventing constipation, dispelling effects of alcohol andthe like.

The invention discloses tea cream for preventing hematogenesis obstacle caused by radiation. The tea cream is prepared by adopting the following raw materials in parts by weight: 25 to 40 parts of Pu-erh tealeaves, 5 to 12 parts of polygala tenuifolia, 6 to 15 parts of astragalus membranaceus, 10 to 15 parts of colla corii asini and 6 to 8 parts of rhizoma nelumbinis. The tea cream has the characteristics of good radiation protection effect and convenience in carrying; after the tea cream is orally taken by people, the radiation protection effect on the whole body can be rapidly realized, the immunity also can be enhanced, a function of reducing the blood glucose and maintaining the beauty can be realized, and the functions of nourishing yin and kidney, clearing away the internal heat, cooling the blood, generating the blood, tonifying the spleen and supplementing the nutrition can be realized; moreover, the conventional materials are used as the raw materials, so that the cost is low, the tea cream is a pure natural beverage, and no burden is produced for the body after people drink the tea cream for a long time.

The invention discloses an anti-radiation electuary capable of replenishing qi and blood. The electuary is prepared by the following raw materials by a weight ratio: 35-55 parts of Pu'er tea leaves, 12-18 parts of Radix Astragali, 8-12 parts of matrimony vine, 6-8 parts of fried jujube, 7-10 parts of cape jasmine and 8-12 parts of radix pseudostellariae. The anti-radiation electuary capable of replenishing qi and blood has characteristics of good radiation prevention effect and convenient carrying, under oral administration effect, the radiation prevention effect for whole body can be affected rapidly, immunity is enhanced, blood sugar is reduced, beauty treatment is realized, and functions of replenishing qi and enriching blood can be realized. According to the invention, locally-common Pu'er tea leaves can be taken as a main raw material, by cooperating with other medicinal materials, the traditional Chinese medicine preparation having tea fragrance capable of replenishing qi and blood can be prepared.

The invention belongs to the technical field of pollution repairing and relates to a soil conditioner for repairing heavy metal polluted farmland and a production method of same. The soil conditioner includes biochar, minerals and cyclodextrin. The production method includes the steps of: (A) preparation of the biochar: calcining carya cathayensis peel carbon to obtain pyrolyzed biochar and performing high-pressure hydrothermal treatment to the carya cathayensis peel carbon to obtain hydrothermal biochar, and mixing the pyrolyzed biochar and the hydrothermal biochar to obtain the biochar; (B) preparation of the minerals: uniformly diatomite powder and chitosan according to the mass ratio of 3:1 to prepare a diatomite composite; (C) blending: uniformly mixing the pyrolyzed biochar, the hydrothermal biochar, the diatomite composite and sheep manure to prepare the soil repairing agent; and (D) granulation: mixing the soil repairing agent with cyclodextrin and performing granulation to obtain the soil conditioner. The soil conditioner, when being used for rice farmland, is economical and effective, allows in-situ repairing and has no addition of chemical substances.

The invention discloses the application of guava leaves in reduction of heavy metal toxicity of farmland soil. The application comprises the following steps: drying guava leaves by air until constantweight is reached; crushing; screening the crushed guava leaves until 60 meshes are reached; adding the preprocessed guava leaves into soil to be treated, wherein the added guava leaves are 0.5-5% ofthe total amount of soil; uniformly mixing; and leaching the guava leaves for at least 16h in soil. The guava leaves are capable of effectively reducing the heavy metal toxicity of the farmland soil,particularly reducing the heavy metal toxicity of the farmland soil surrounding a lead-zinc mineral area; the guava leaves have passivating effects, and are wide in source, low in cost, green, environmentally friendly, and free from secondary pollution to the soil.

The invention relates to a pure natural non-toxic preparation for treating leprnorthsis of angel fish and further relates to a preparation method of the pure natural non-toxic preparation for treating leprnorthsis of the angel fish. The pure natural non-toxic preparation for treating leprnorthsis of the angel fish comprises components in parts by mass as follows: 28-35 parts of cactus juice, 19-25 parts of bengal waterdropwort herb, 19-23 parts of aqueous extract of garden burnet roots, 10-18 parts of zymic Pu'er tea, 18-23 parts of morning glory, 17-23 parts of Japanese pearlwort herb, 16-22 parts of mazus japonicus, 15-21 parts of common cephalanoplos herb, 14-20 parts of siberian cocklour fruits, 14-18 parts of common selfheal fruit-spike, 12-19 parts of black nightshade herb, 12-18 parts of tuber fleeceflower roots, 12-18 parts of twotooth achyranthes roots, 9-16 parts of roots of multibract raspberry, 9-16 parts of downy aletris, 7-15 parts of nettles and the like. The pure natural non-toxic preparation for treating leprnorthsis of the angel fish has a good treatment effect on leprnorthsis.

The invention discloses a method for modifying biochar, comprising: 1) pyrolyzing wheat straw and fresh whole cattail plants into biochar with limited oxygen and pulverizing them; 2) first soaking the prepared biochar in hydrogen peroxide, and then Soak in an aqueous solution of maleic acid and polyethylene glycol, cool and filter to obtain solid phase A; 3) disperse solid phase A in ethanol to form a suspension, add 2, 2, 6, 6-tetramethylpiperidine-nitrogen-oxide, methacrylic acid to obtain solid phase B; 4) solid phase B is soaked in an aqueous solution of acetic acid, and potassium periodate is added to the solution to obtain solid phase C; 5) The solid phase C was soaked in the mixture of dimethylformamide and N-methylpyrrolidone to obtain the modified biochar. The invention optimizes the modification process of biochar, adopts wheat straw and cattail as composite biochar, and optimizes the modification on the basis of the composite biochar, so that the Cd repair effect of biochar is very significant, and after being applied to cadmium-contaminated soil , significantly reducing the toxicity of heavy metals in the soil.