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 relates to the technical field of water treatment, in particular to a nitrogen and phosphorus advanced treatment system for sewage treatment. The nitrogen and phosphorus advanced treatment system comprises a pretreatment system, a first-stage biological denitrification and phosphorus-removal system and a second-stage advanced denitrification and phosphorus-removal system, and the pretreatment system is composed of a coarse screen filtering tank, a fine screen filtering tank and a first stage sedimentation tank which are connected in turns through pipelines; the first biological denitrification and phosphorus-removal system is composed of an anaerobic tank, an anoxic tank and an aerobic tank which are connected in turns through pipelines; and the second-stage advanced denitrification and phosphorus-removal system is composed of a secondary sedimentation tank, a filtering tank, a disinfection tank, a zeolite filter, a resin filter and a mixed sedimentation tank which are connected in turns through pipelines. By combining the first-stage biological denitrification and phosphorus-removal system and the second-stage advanced denitrification and phosphorus-removal system, the advanced treatment of nitrogen and phosphorus in sewage is realized, the risk of eutrophication of water bodies is reduced, and by simultaneously adopting novel materials and a regeneration process, the selective adsorption and concentration of nitrogen and phosphorus are realized, and recycling of nitrogen and phosphorus is realized.

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 provides a soft water cyclic heating / cooling system corrosion inhibitor. The corrosion inhibitor is an isothiourea-based and carboxyl-based functional pentitol core hyperbranched macromolecule, and the chemical formula of the corrosion inhibitor is C5H7O5{COC(CH3)[CH2OCOCH2CH(COOH)SC(NH)NH2]2}5. The corrosion inhibitor has the characteristics of being free of phosphorus, biodegradable, free of toxins, low in cost and good in corrosion inhibition effect and has excellent corrosion inhibition performance for equipment of a cyclic heating / cooling system with soft water as water, andthe recycling rate of circulating water can be remarkably increased. The invention further provides a preparation method of the corrosion inhibitor. The process is simple, raw materials are easy to obtain, and industrialization is easy.

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 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 method used for recycling microalgae residue and producing spirulina rich in polysaccharides. According to the method, hydrothermal carbonization is adopted to recycle nutrients in microalgae residue as nitrogen sources, carbon sources, and other nutrient elements in culturing of spirulina, conventional nutritive salt (such as sodium nitrate and urea) supplying method is replaced to produce spirulina rich in polysaccharides, the content of polysaccharide in biomass is 65% or higher, and is increased by 15 to 56% compared with that of common culture medium; polysaccharide yield is increased by 23% to 3.5 times of that of common culture medium. The method is capable of realizing resource utilization of wastes, reducing consumption of nutrient salts, increasing spirulina polysaccharide yield and quality, and reducing production cost, and is beneficial for simplifying of downstream processing operation, and promoting of industrialized production of spirulina.

The invention discloses modified nanometer chlorapatite and a preparation method thereof. The modified nanometer chlorapatite consists of nanometer chlorapatite and rhamnolipid, wherein the rhamnolipid is modified on the surface of the nanometer chlorapatite; the mass ratio of the nanometer chlorapatite to the rhamnolipid is (19.9277 to 47):1. The preparation method comprises the following steps of dripping CaCl2 solution into the rhamnolipid solution; performing stirring; dripping Na3PO4 solution into the obtained mixed solution; performing stirring to obtain modified nanometer chlorapatite. The modified nanometer chlorapatite provided by the invention has the advantages that the particle diameter is small; the cost is low; the dispersion performance is good; the stability is high; the environment-friendly effect is achieved; no toxicity and harmlessness are realized, and the like. The bottom mud heavy metal lead can be more efficiently passivated; meanwhile, the water body eutrophication risk brought by application and use of phosphorated materials can be reduced to a certain degree; the application of the chlorapatite material to the practical field restoration is promoted; the modified nanometer chlorapatite is suitable for large-scale use.

The invention discloses a method for removing heavy metals in waste water by using a magnetic nano chlorapatite adsorbent. The method comprises the following steps: adding the magnetic nano chlorapatite adsorbent in the waste water; oscillating at constant temperature; and then magnetically separating the magnetic nano chlorapatite adsorbent from the solution so as to remove heavy metal ions in the waste water, wherein the magnetic nano chlorapatite adsorbent comprises nano chlorapatite and magnetic powder Fe2O3, and the molar ratio of the magnetic powder Fe2O3 to the nano chlorapatite is 1-11:1. The method is simple to operate, high in removal rate of heavy metals, low in cost, clean and pollution-free, and does not have toxic or harmful effects on the environment.

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 discloses a method for preparing lanthanum-loaded charcoal used for purifying phosphorus polluted water. The method comprises the following steps: adding maize straws which pass through a 60-100-mesh sieve into a lanthanum solution, regulating the pH of the solution to be not less than 10 by using 4-6M of NaOH or ammonium hydroxide, centrifuging, removing supernatant, and cleaning by using 95% ethanol; drying and mashing cleaned solids, and performing pyrolysis in a muffle furnace; cooling a pyrolysis product to room temperature, grinding the materials which pass through the 60-100-mesh sieve, repeatedly cleaning the materials to be pH of below 8 by using distilled water, and drying to obtain products, wherein the product which passes through the 60-100-mesh sieve is the lanthanum-loaded charcoal. The prepared lanthanum-loaded charcoal has the high phosphorus removal efficiency, the preparation process is simple and feasible, the preparation cost is low, straw wastes are fully utilized, the environmental pollution caused by straw incineration is reduced, the lanthanum-loaded charcoal is reutilized for returning to field, and the carbon pool and the phosphorus pool of soil are increased.

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 modified nanometer chlorapatite and a preparation method thereof. The modified nanometer chlorapatite consists of nanometer chlorapatite and rhamnolipid, wherein the rhamnolipid is modified on the surface of the nanometer chlorapatite; the mass ratio of the nanometer chlorapatite to the rhamnolipid is (19.9277 to 47):1. The preparation method comprises the following steps of dripping CaCl2 solution into the rhamnolipid solution; performing stirring; dripping Na3PO4 solution into the obtained mixed solution; performing stirring to obtain modified nanometer chlorapatite. The modified nanometer chlorapatite provided by the invention has the advantages that the particle diameter is small; the cost is low; the dispersion performance is good; the stability is high; the environment-friendly effect is achieved; no toxicity and harmlessness are realized, and the like. The bottom mud heavy metal lead can be more efficiently passivated; meanwhile, the water body eutrophication risk brought by application and use of phosphorated materials can be reduced to a certain degree; the application of the chlorapatite material to the practical field restoration is promoted; the modified nanometer chlorapatite is suitable for large-scale use.

The invention discloses a method for recycling reclaimed water in a circulating cooling water system. The method is characterized by comprising the following steps: (1) adding lime to the reclaimed water to carry out softening treatment and then carrying out solid-liquid separation; (2) adding silicates as corrosion inhibitors to the reclaimed water obtained after solid-liquid separation in the step (1); (3) adding the reclaimed water to which the silicates are added in the step (2) to circulating cooling water of the circulating cooling water system as replenished water of circulating cooling water; (4) adding polymer scale inhibitors and dispersants to the circulating cooling water to which the reclaimed water is added in the step (3). By adopting the method, non-phosphorus operation can be achieved in the whole process from reclaimed water transport to circulating cooling water system operation, thus avoiding the risk of water body eutrophication caused by circulating water pollution discharge and effectively reducing corrosion of transport pipelines caused by the reclaimed water.

The invention discloses a treatment method for bamboo pulp wastewater. The method is improved on the basis of a conventional treatment method for bamboo pulp wastewater, large suspended matters are screened out, filtered and removed from wastewater, trace elements are added before treatment in a primary settling tank, the temperature of the wastewater cooled before entering an aeration tank is increased, and meanwhile, nutritive salt added to the aeration tank is gradually reduced. The nutritive salt containing two trace elements molybdenum and strontium is added, foam generated as a result of addition of a large amount of nitrogen and phosphorus is remarkably reduced, accordingly, expenses required for addition of nitrogen and phosphorus nutritive salt, an antifoaming agent and the like are saved while the biological activity of the aeration tank is guaranteed, and the content of total nitrogen and total phosphorus in discharged wastewater is substantially reduced. Besides, according to the method, the temperature of the wastewater is properly increased, the microorganism activity is still maintained, and the energy consumption required for reduction of the temperature of the wastewater is reduced. The cost for removing 1kg of COD (chemical oxygen demand) is reduced from 1.04 RMB to 0.67 RMB, the total nitrogen in the discharged wastewater is reduced by 28%, the total phosphorus in the discharged wastewater is reduced by 45%, and the treatment method has remarkable environmental benefits and economic benefits.

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 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 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 relates to a feed for culturing rice-fragrance grass carps, and a culturing method of the rice-fragrance grass carps. The feed comprises the following components in weight percentage: 20-30% of algae powder granules, 10-15% of modified soapstone powder, 1-3% of micronutrients, 10-20% of an adhesive, and 40-50% of a mixture of fermented dregs. The feed and the culturing method provided by the invention are adopted to feed the grass carps for 6 months, and the survival rate of the grass carps reaches 100%, and the multiple of weight gaining is 11.07-12.16. Detection indicates that the harvested grass carps are high in protein content, low in fat content, and delicious in meat quality; and meanwhile, in intestinal tracts of the grass carps, the contents of pathogenetic bacteria easily causing enterogastritis are lowered, wherein the pathogenetic bacteria comprise aeromonas hydrophila, aeromonas punctata f. intestinalis, aeromonas caviae, escherichia coli and enterococci, and the contents of probiotics such as lactobacillus and bifidobacteria are increased, so that the risk of enterogastritis occurrence among the grass carps is effectively decreased.

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 special efficient compound base fertilizer for eucalyptus. The special compound base fertilizer for eucalyptus disclosed by the invention still has good phosphorus release efficiency under the condition that a relatively large proportion of ground phosphate rock is used, the utilization rate of total phosphorus is high, the growth of the eucalyptus can be better promoted, and the volume increase rate of the eucalyptus can reach 49% or even more in the annual period. Besides, the special compound base fertilizer for the eucalyptus is simple to prepare and easy for large-scale production, and the used raw materials are rich in source and low in price, so that the special compound base fertilizer has good economical efficiency.

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.

The invention discloses a method of recycling reclaimed water for a recirculating cooling water system. The method comprises steps of: (1) adding a transition metal salt corrosion inhibitor and an azole corrosion inhibitor into the reclaimed water; (2) adding the reclaimed water to which the transition metal salt corrosion inhibitor and the azole 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 assure water conveying safety and simplify a treatment technology of the recirculating cooling water.