38results about How to "Reduce the risk of eutrophication" patented technology

The invention belongs to the technical field of fertilizer application, and particularly relates to a method for application of organic fertilizer substituting chemical fertilizer in a quantitative manner. The method comprises the following steps of: S1, according to the crop growth environment, estimating the obtainable yield of a certain field under the best nutrient management measures according to the average yield of the crop in the past several years; S2, respectively calculating the agronomic efficiency of nitrogen fertilizer and the total quantity of nitrogen required to achieve the obtainable yield; S3, according to principle that the nitrogen nutrient of the organic fertilizer substitutes the nitrogen nutrient of the chemical fertilizer in a quantitative manner, respectively calculating the recommended application quantity of the organic fertilizer and the quantity of the nitrogen fertilizer substituted by the organic fertilizer; and S4, performing fertilizer application according to the recommended quantity of the organic fertilizer to the field, wherein the recommended quantity of the organic fertilizer is obtained through calculation. The method disclosed by the invention has the advantages of simplification, quantification, rationalization and the like. By only evaluating the crop growth environment and the soil fertility status, and using the key parameters such as the obtainable yield, nitrogen fertilizer reaction indexes and organic fertilizer substitution indexes, the total application quantity of the nitrogen fertilizer and the organic fertilizer can be quickly and accurately estimated, and the crop yield and the nitrogen use efficiency are effectively increased.

The invention discloses a method of recycling reclaimed water for a recirculating cooling water system. The method comprises steps of: (1) adding a zinc salt corrosion inhibitor and a first corrosion inhibitor into the reclaimed water with the first corrosion inhibitor containing hydroxyl carboxylate and/or a transition metal salt corrosion inhibitor and being different from the zinc salt corrosion inhibitor; (2) adding the reclaimed water to which the zinc salt corrosion inhibitor and the first corrosion inhibitor are added in the step (1) as replenishing water of recirculating cooling water into the recirculating cooling water of the recirculating cooling water system; and (3) adding a non-phosphorus scale inhibitor and a co-polymer scale-inhibiting dispersant into the recirculating cooling water to which the reclaimed water is added in the step (2). The method can effectively inhibit corrosion to the reclaimed water conveying pipelines and the recirculating cooling water system. When the reclaimed water is recycled as the recirculating cooling water, no phosphor corrosion inhibitor is needed to be added into the recirculating cooling water.

The invention provides a preparation method of a wetland plant and pig manure composite biochar, and an application of the composite biochar in the adsorption of heavy metals in water. Typical wetlandplants of Poyang Lake are selected, the aerial parts of the wetland plants are harvested in the growing season, pig manure is obtained from a pig farm, the collected wetland plant biomass is washed with water, dried and crushed, the pig manure is dried and crushed sequentially, and the plant biomass and pig manure biomass are mixed according to a ratio 1:1 to form a mixed biomass; chitosan and alkali residues are dried, and are crushed and mixed according to a mass ratio of 1:1; the mixed biomass and the obtained chitosan and alkali residue powder are mixed according to a ratio of 10:1 to prepare a composite biomass; and the composite biomass is added to an iron solution, anaerobic hydrothermal carbonization is carried out to form the composite biochar, and the composite biochar is used for adsorbing heavy metals in water. The preparation method fully utilizes several typical wastes in the Poyang Lake basin, achieves the purpose of treating pollution with wastes, and also has the advantages of wide sources of raw materials, low cost, simplicity, and easiness in operation, and the prepared biochar adsorbent is nontoxic and harmless, and is friendly to the environment.

The invention relates to a method for biologically eliminating and controlling the eutrophication of an open water body on the basis of a daphnia magna food chain relationship according to the principle of in-situ ecosystem remediation, and particularly relates to a daphnia magna domestication method. The method comprises the following steps: selecting a target water body to be treated; monitoring the water quality and pollution sources of the water body; according to the water quality and the pollution sources, domesticating and cultivating daphnia magna by stages with scenedesmus obliquus and eutrophic water mixed liquids until the daphnia magna is completely adapted to the environmental condition of the target water body to be treated, wherein the scenedesmus obliquus and eutrophic water mixed liquids have different scenedesmus obliquus concentrations; then continuously, regularly and uniformly putting the daphnia magna into the target water body according to a low concentration; and finally introducing specific fish, such as aristichthysnobilis, which feeds on the daphnia magna. Through the method, the problem of eutrophication of the open water body can be solved effectively, an original ecosystem is recovered, and in-situ remediation of the water body is realized.

The invention relates to environment-friendly corrosion inhibitor 5-isothiourca succinic acid adonitol ester for deionized water and a preparation method thereof. The corrosion inhibitor is 5-isothiourca succinic acid adonitol ester, and a chemical formula thereof is C5H7[OCOCH2CH(COOH)SC(NH)NH2]5. The 5-isothiourca succinic acid adonitol ester has the advantages of being biodegradable, non-toxic, low in cost and good in treatment effect, and is suitable for corrosion inhibition treatment of a deionized water system.

The invention relates to a novel biological floc. The biological floc includes microalgae aggregates and commensalism heterotrophic bacteria, and the commensalism heterotrophic bacteria are Pesudomonas sp. and Bacillus sp. The biological floc significantly improves the water quality of the nursing pond of the litopenaeus vannamei, improves the survival rate, growth index and immunity of the litopenaeus vannamei, reduces the application amount of compound feed and external carbon sources, and reduces the aeration intensity and quantity of exchanged water.

The invention discloses a treatment method of pig manure. The treatment method comprises the following steps of 1, uniformly mixing fresh pig manure and water according to a solid-liquid ratio of 1:(1to 2), so as to obtain a manure and water mixture; putting the obtained manure and water mixture into a sealed reaction kettle, performing hydrothermal carbonizing reaction under the oxygen-free condition, stirring at the rotation speed of 80 to 120r/min, and reacting for 30 to 60min at constant temperature of 150 to 300 DEG C; after reaction is finished, stopping heating and stirring, and cooling to room temperature, so as to obtain a reaction product; finally, filtering the reaction product, or freely settling to separate solid and liquid, wherein the filter liquid is the crude liquid of liquid fertilizer, and the filter residue is charcoal. The treatment method has the advantages that the fermenting treatment on the pig manure is not required, the collected fresh pig manure is directlyused for processing and production, and the production cycle is short; the adding of other additives is not required, so that the dewatering treatment is not required before treatment, and the cost is lower; the amount-reduction and harmless effects of the pig manure can be realized, and most of fertilizer nutrients in the pig manure can be reserved.

The invention discloses an environment-friendly corrosion and scale inhibitor for a boiler. The environment-friendly corrosion and scale inhibitor is prepared from deionized water, sodium sulfonate, potassium sulfonate, benzotriazole, 2-acrylamide-2-methyl propane sulfonic acid, dodecyl dimethyl benzyl ammonium chloride, methyl alcohol, alkylphenol polyoxyethylene, hexamine, sodium tungstate and lignin sulfonate. The environment-friendly corrosion and scale inhibitor is applicable to dealing with scaling and corrosion problems of heat equipment such as the boiler; the phosphorus value in discharged water is 0.1 to 0.3 mg/L, appear of calcium phosphate scale precipitates can be prevented, the risk of eutrophication of water is reduced, the quality is reliable, and the tolerance is high; the inhibitor is high in applicability and can be prevented from being deposited on a high-temperature heat exchanger, and the service life of the boiler can be greatly prolonged; with the advantages of low dosage, efficiency and energy conservation, the inhibitor can be used in water with high alkalinity, high hardness, high pH value and high concentration multiple; all the components generate the synergistic effect; and the corrosion rate to carbon steel is 0.001 to 0.003 mm a<-1>, and the scale inhibition rate is 98.5 percent to 99.5 percent.

The invention discloses a method for treating organophosphorus-containing wastewater. The method comprises the following steps: step 1, pretreating wastewater by adopting an electrode; and 2, adding polymeric ferric as a flocculating agent into a flocculation tank to carry out flocculation treatment on the pretreated wastewater to obtain iron phosphate and phosphorus-containing up-to-standard discharge wastewater. The method has the beneficial effects that a BDD electrode or graphene electrode is used for pretreatment, so that COD in the sewage is reduced, organic matter which is difficult tobiodegrade is decomposed into small molecular organic matter, and meanwhile, organic phosphorus is converted into inorganic phosphorus for subsequent flocculation treatment; and by controlling the number of the BDD electrodes, the cost is reduced, organophosphorus is effectively degraded through a coupling system of the BDD electrode and the graphene electrode. The method is easy to operate, efficient control over the organophosphorus content in the wastewater is achieved, it is guaranteed that the treated wastewater can be discharged up to the standard according to the high standard, and theeutrophication risk of the water body is greatly reduced.

The invention discloses a method for passivating heavy metal lead in bottom mud by using modified nanochlorapatite. The method comprises the following steps of airing lead-containing bottom mud, and crushing the lead-containing bottom mud to obtain crushed lead-containing bottom mud; and adding the modified nanochlorapatite to the crushed lead-containing bottom mud for standing, and passivating heavy metal lead in the bottom mud, wherein the modified nanochlorapatite is prepared from nanochlorapatite and rhamnolipid; the rhamnolipid is modified on the surface of the nanochlorapatite; and the mass ratio of the nanochlorapatite to the rhamnolipid is (19.9277-47):1. The method is simple and convenient to operate, significant in passivation effect on the heavy metal lead and suitable for in-situ repairing of the bottom mud, and has the characteristics of being environment-friendly and harmless.

The invention discloses an ecological improvement method for a sandy river channel matrix. The method comprises gravel river reach matrix improvement and fine sandy river reach matrix improvement. The gravel river reach matrix improvement comprises the steps of pretreatment, matrix layer improvement, maintenance layer laying, reinforcement treatment and the like. The fine sandy river reach matrix improvement comprises the steps of pretreatment, matrix layer laying, maintenance layer laying, reinforcement treatment and the like. According to the method, different treatment methods are adopted for sandy river channels with different characteristics, targeted treatment can be conducted on the river channel matrix, and the optimal improvement effect can be achieved. After the sandy river channel matrix is improved by the improvement method, the stability of a river channel slope is greatly improved, the water seepage performance is reduced, the good water and fertilizer retention capacity is achieved, vegetation can be well planted on the improved river channel, and the improvement of the ecological environment of the river channel is facilitated.

The invention provides a cleaning and pre-filming method for a circulating water system in a park. The method comprises a primary cleaning stage, a secondary cleaning stage and a pre-filming stage. Aphosphorus-free corrosion inhibitor and a silicon-free defoaming agent are adopted in the method provided by the invention, so that the risk of eutrophication of a water body caused by pollution discharge of circulating water can be reduced due to a low phosphorus content while generation of dirt is effectively slowed down.

The invention discloses a nitrogen-reduced ecological fertilizer capable of increasing the yield of Wuchang fragrant rice. The weight ratio of nitrogen to sulfur in the ecological fertilizer is (90-180):45. High yield, the yield increasing benefit of a nitrogen element and the highest utilization ratio of the nitrogen element are realized by the matched application of the nitrogen element and a sulfur element, so that the nitrogen-reduced ecological fertilizer capable of increasing the yield of the Wuchang fragrant rice and a fertilizer application method are matched.

The invention discloses an in-situ water treatment method for a portunus trituberculatus culture pond in the technical field of aquaculture. The in-situ water treatment method comprises the followingsteps of (1) early-stage culture preparation; (2) jellyfish culture; (3) portunus trituberculatus culture; and (4) daily management. According to the invention, jellyfishes can eat portunus trituberculatus residual feed and zooplankton, and frequent fertilizer and water are not needed, so that the culture cost can be reduced, and the growth speed of the jellyfishes is increased; compared with a traditional single species culture mode for portunus trituberculatus culture, the method has the advantages that water resources are saved, the pollution to the environment is reduced, and relatively good ecological benefits are achieved; and compared with jellyfish culture, the method has the advantages that bait feeding is reduced, limited resources are reasonably utilized, secondary pollution isavoided, and relatively good economic benefits are achieved.

The invention provides a slow-release solid scale inhibitor as well as a preparation method and application thereof. The calcium polyepoxysuccinate comprises the following components: 80-94% of calcium polyepoxysuccinate, 5-19% of a binder and 1-2% of a lubricant. Or, the calcium polyepoxysuccinate comprises the following components: 50-79% of calcium polyepoxysuccinate, 5-19% of soluble alginate, 15-30% of a soluble curing agent and 1-2% of a lubricant. The invention also provides a preparation method of the slow-release solid scale inhibitor, and the preparation method can be a wet tabletting method or a microcapsule method. The slow-release solid scale inhibitor is a phosphorus-free and biodegradable environment-friendly scale inhibitor, is resistant to water flow scouring, has slow release performance, has good scale inhibition and dispersion performance on calcium carbonate, calcium sulfate, barium sulfate, silicon scale and the like in water due to the slow release amount, and is long in scale inhibition time and resistant to high temperature. When the scale inhibitor is used in the water heater, the scale inhibition performance of the water heater is improved, the scale inhibitor can be directly discharged, and the eutrophication risk in a water body is reduced.