56 results about "Heavy metal binding" patented technology

The present invention relates to heavy metal chelate compositions, which are used as fungicides and bactericides, and methods of using the compositions. In particular, the present invention relates to a chelate, that is an EDDHA (copper-ethylenediamine-di-o-hydroxyphenylacetic acid), combined with a heavy metal, including iron, tin, zinc, manganese, copper, and combinations thereof.

The invention relates to a treatment system and a treatment method for reducing the amount of volatile heavy metal sludge in desulfurization wastewater. A two-stage chemical precipitation technique is adopted to treat desulfurization wastewater, hydrochloric acid is added to regulate the wastewater in the first stage of chemical precipitation, so that the wastewater becomes acidic, polyaluminium chloride as polycoagulant and polyacrylamide as coagulant aid are added for flocculation reaction, consequently, the content of the volatile heavy metal in the sludge in the first stage of chemical precipitation is greatly reduced, while the amount of the sludge is increased, and thereby the sludge can be added into a boiler and burnt; calcium hydroxide is added to regulate the wastewater in the second stage of chemical precipitation, so that the wastewater becomes alkaline, heavy metal precipitator-organic sulfur (TMT15) is added to combined with the heavy metal in the wastewater to form highly stable chelate, molysite as polycoagulant and polyacrylamide as coagulant aid are added, so that the sludge in the second stage of precipitation is rich in the heavy metal, while the amount of the sludge is little, and thereby the sludge can be buried alone. Hydrochloric acid and sodium hypochlorite are added into clean water, so that the treated discharged water can meet the requirements of GB8978-1996 and DL/T 997-2006 standards.

The invention discloses a heavy metal adsorbent based on plant straws. The heavy metal adsorbent is characterized by being prepared from the following raw materials in parts by weight: 10-15 parts of reed straws, 10-15 parts of corn straws, 3-5 parts of corn cobs, 3-5 parts of peat, 1-2 parts of carboxymethyl chitosan, 2-4 parts of malic acid, 0.3-0.5 part of gamma-polyglutamic acid, 1-2 parts of sodium gluconate, 2-4 parts of calcium chloride, 1-2 parts of sodium citrate, 4-6 parts of auxiliaries and 40-50 parts of water. According to the heavy metal adsorbent based on plant straws and the preparation method for the heavy metal adsorbent disclosed by the invention, agricultural wastes are effectively recycled to prepare the heavy metal adsorbent, so that the raw material source is wide, the price is low, the heavy metal bonding and adsorbing capacity is strong, and pollutants such as nitrogen and phosphor in water can be adsorbed. Moreover, the heavy metal adsorbent is safe, environmentally friendly, non-toxic and harmless, free of secondary pollution to the environment in a wastewater treatment process, good in economical efficiency and strong in practicability.

The invention relates to a DTPA modified material and a preparation method for a rapid-full-dissociation type DGT (Diffusive gradients in thin films) coupling phase prepared therefrom. DTPA reacts with Mg<2+> and Al<3+> under alkaline conditions. The method comprises the steps: (1) adding 24.4ml of ammonia water (NH4(OH)) and methanol into 73.20ml of water, uniformly mixing the ammonia water, the methanol and the water, then, adding 32.78g of DTPA into the mixture, and thoroughly dissolving DTPA; (2) fetching another beaker, adding 593.34ml of water and 197.78ml of ammonia water into the beaker, uniformly mixing the water and the ammonia water thoroughly; and (3) simultaneously adding solutions obtained in the step (1) and the step (2) into a solution containing MgCl2.6H2O and AlCl3.6H2O so as to prepare the DTPA modified material, carrying out spray drying, then, sieving the dried DTPA modified material by a sieve with the pore size of 200 meshes (75 microns) so as to form a heavy-metal adsorption material for a DGT coupled film, then, adding the heavy-metal adsorption material into a polyacrylamide gel solution, and carrying out reaction at a certain temperature, thereby preparing the DGT coupled film. The gel film prepared by the method disclosed by the invention has the effects of heavy-metal adsorption and short-time full dissociation, and the disadvantage that the dissociation of the former heavy-metal coupling phase is slow and incomplete is overcome. The materials used are cheap and are easily prepared, and no secondary pollution is caused, so that the popularization and application of a DGT technology are facilitated.

The invention discloses a heavy metal ion adsorbent prepared from lotus leaves. The heavy metal ion adsorbent is characterized by being prepared from the following raw materials in parts by weight: 20-30 parts of fresh lotus leaves, 5-10 parts of attapulgite, 1-2 parts of calcium chloride, 1-2 parts of sodium chloride, 0.5-1 part of sodium alginate, 0.5-1 part of sodium oxalate, 1-2 parts of Arabic gum, 0.5-1 part of hydroxyethyl cellulose, 0.1-0.2 part of gallic acid, 4-6 parts of an auxiliary agent and 40-60 parts of water. The heavy metal ion adsorbent is prepared from the lotus leaves as the main raw material, so that the source is wide, and the price is low; furthermore, the combining capacity and the adsorbability of heavy metals are strong, the adsorption capacity is large, safety and environmental protection are achieved, and toxic and harmful effects are avoided; secondary pollution to the environment during sewage treatment is avoided, the efficiency is high, the cost is low, and high economical value and practicability are achieved.

The invention discloses a soil heavy metal activator and a preparation method thereof, and belongs to the technical field of soil repairing. The activator is composed of the following raw materials in parts by weight: 60 to 140 parts of activating substance, 50 to 500 parts of sulfur-containing compound, 0 to 1000 parts of organic material assuming that the organic material has a water content of 10%, 0 to 500 parts of alkaline substance calculated by sodium hydroxide, 0 to 500 parts of reducing substance, and 0 to 200 parts of water. The activator has a strong binding force on heavy metals and extremely strong specificity. The heavy metal content in the soil solution is greatly improved after the activator is applied to the soil, especially the contents of cadmium, copper, and lead. Moreover the arsenic content in soil solution is greatly improved under a water flooding condition, and thus the activator can be directly applied to repairing of plants and soil polluted by heavy metals. During the application process, the operation is simple, the using amount is low, the price is cheap, the cost is low, and the activator can be used in Chinese dry lands polluted by cadmium in different degrees.

The invention relates to a coupling method for treating wastewater containing heavy metal ions by algae and preparing biomass fuel from the algae. The coupling method comprises: introducing the wastewater into an algae pond, and removing heavy metal by the algae through biological adsorption and biological absorption, wherein an algae cell wall contains a lot of polysaccharides and proteins and is combined with the heavy metal; after finishing wastewater treatment, collecting the used algae through a fishing and filtering method; carrying out airing treatment; putting the algae into a vacuum reactor and carrying out dry distillation; heating to 400 DEG C to 600 DEG C and naturally cooling to room temperature; cooling a gas product, generated by pyrolyzation, through a condensation device, and collecting to obtain a liquid product; discharging uncondensed gas through an exhausting pipe; after centrifuging and separating the liquid product, obtaining a water-phase product and biomass oil, wherein gas is a fuel gas product, liquid is fuel oil and residues in the reactor are carbonized algae residues and heavy metal grains conglobated at high temperature; collecting reactant residues and calcining to obtain metal powder. The total resource utilization efficiency is improved.

The invention discloses application of polysaccharide functionalized nano-selenium to selenium-enriched rice planting. Polysaccharide functionalized nano-selenium is sprayed on the part of the rice oris sprayed on soil for planting the rice in different planting periods of the selenium-enriched rice, wherein the polysaccharide functionalized nano-selenium comprises one or at least two of chitosannano-selenium, pachymaran nano-selenium and lentinan nano-selenium. The polysaccharide functionalized nano-selenium can increase the selenium content of brown rice and is good for human health. The polysaccharide functionalized nano-selenium can be combined with heavy metal in the brown rice, chaff and straws, so that the heavy metal content of the rice is effectively reduced.

The invention discloses an aerogel type heavy metal adsorbent high in adsorbing capacity and high in adsorbing efficiency and a preparing method thereof. The aerogel type heavy metal adsorbent is prepared by being compounded by an aerogel material and organic matter containing chelation groups. The aerogel material and a chelating agent are combined, the large specific surface area and pore volumeof the aerogel material and the heavy metal combining effect of the chelating agent are utilized, and the adsorbent has the advantages of being high in adsorbing capacity and high in adsorbing efficiency; dopamine is used as a bridging material, aerogel and the chelating agent are combined together through a chemical bond, the stability is high, and the preparation is convenient.

The invention belongs to the technical field of chemical industry, and relates to a production formula and manufacturing method of a compound fertilizer. The compound fertilizer is mainly composed of urea, potassium chloride, ammonium dihydrogen phosphate, zinc sulfide, organic sulfur TMT-15, peat and kieselguhr. The compound fertilizer not only contains nitrogen, phosphorus and potassium required by plant growth, but also contains zinc, iron, calcium, magnesium, sodium, silicon, sulfur and other minor elements required by plant production as well as peat capable of improving soil aggregate structure. Besides, the compound fertilizer also contains a complexing agent zinc sulfide capable of being complexed with heavy metals in soil and a chelator organic sulfur TMT-15, which can be combined with mercury, lead, copper, cadmium, nickel, manganese, chromium and other heavy metals in soil to form water-insoluble sulfides, thereby preventing the plants from absorbing the heavy metals in the soil and achieving the goal of treating heavy metals in soil.

The invention provides a soil heavy metal passivator. The soil heavy metal passivator comprises, in percentage by weight, 88%-94% of chitosan, 4%-6% of glacial acetic acid and 2%-6% of water. The chitosan can be combined with heavy metal in soil, the passivation function on the heavy metal in the soil is realized, the condition that crops absorb the heavy metal in the soil in the production period is prevented, and the crops are protected from pollution of the heavy metal.

The invention discloses a heavy metal adsorbent prepared from grape wine residues. The heavy metal adsorbent is prepared from the following raw materials in parts by weight: 20-30 parts of grape wine residues, 5-10 parts of rice husk, 1-2 parts of boric acid, 0.1-0.2 part of lauric acid, 3-5 parts of hydroxyethyl cellulose, 0.1-0.2 part of polyaspartic acid, 1-2 parts of ethylenediaminetetraacetic acid disodium salt, 3-5 parts of sodium chloride, 1-2 parts of sodium lignosulfonate, 4-6 parts of additives and 40-50 parts of water. The heavy metal adsorbent is prepared from waste grape wine residues as a main raw material, has the characteristics that heavy metals can be combined, the adsorption property is high and the adsorption capacity is large, is safe and environmentally friendly, free of toxicity or harm, free of secondary pollution to the environment in the wastewater treatment process, can save the energy and reduce emission, and is economical and practical.

The invention discloses an agarose hydrogel microsphere prepared by compounding an agarose hydrogel and a heavy metal binding agent. According to the invention, lipoic acid and a polycarboxyl compoundare compounded to form a compound heavy-metal chelating agent which is grafted and immobilized on the agarose hydrogel microsphere so as to give full play to the synergistic effect of the lipoic acidand the polycarboxyl compound on removal of heavy metals, so the agarose hydrogel microsphere with a heavy metal binding function is obtained. As the agarose hydrogel microsphere with the heavy metalbinding function is applied to cosmetics or medicines for binding to toxic heavy metals on the surface of skin, the toxic heavy metals on the surface of skin can be effectively, rapidly and selectively bound and removed, and the agarose hydrogel microsphere has high selectivity, large adsorption capacity and high adsorption rate and can avoid adverse reactions in oral administration of detoxification drugs; and a preparation method for the agarose hydrogel microsphere in the invention has the advantages of simple process, convenient operation and good material stability, and the prepared agarose hydrogel microsphere has a wide application scope and practical application value.

The invention discloses a preparation method of a mariculture heavy metal pollution treating agent. The preparation method comprises steps as follows: step 1, seafood waste is processed into powder, and after water is added to the powder, a mixed solution is subjected to ultrasonic and irradiation treatment; step 2, protease is added to the mixed solution for high-pressure enzymolysis, then the solution is subjected to enzyme deactivation in water bath at the temperature of 100-120 DEG , centrifuged and filtered, a filtrate is obtained and subjected to reduced-pressure concentration to reach 1/2 of the original volume, and the mariculture heavy metal pollution treating agent is obtained. According to the preparation method, the seafood waste is utilized for preparing the treating agent, protein in the seafood waste can be effectively extracted through ultrasonic and irradiation treatment and taken as an active substance of the treating agent, the protein in the seafood waste can form small-molecule amino acid after protease treatment, an amino acid chelating agent is formed by the small-molecule amino acid and citric acid and can be bound with heavy metal in water to sink the heavy metal into the pond, and culture water quality is improved.

The invention belongs to the technical field of environment treatment, and discloses a waste fly ash treatment agent, and a preparation method and an application thereof. The waste fly ash treatment agent has a plurality of heavy metal binding sties and a long hydrophobic chain, can realize long-acting and high-efficiency stability of heavy metals, and forms a hydrophobic coating on the surface of ash to prevent the re-dissolving of the stable metals and reduce the surface energy of treated waste fly ash, so the compatibility with asphalt and cement is increased, and harmless treatment and recycling of the waste fly ash are convenient.