36results about How to "To achieve the effect of resource utilization" patented technology

The invention relates to a method of preparing a lignin-based positive ion organic flocculant by using paper mill sludge. The method comprises the following steps: extracting a raw material and directly dissolving by alkali liquor; carrying out centrifugal separation to obtain supernate; adjusting the pH of the solution; placing the adjusted solution in a reactor and heating to a certain temperature; sequentially adding N,N-dimethylformamide epoxy chloropropane, ethanediamine and triethylamine; and stirring to react. According to the method provided by the invention, a quantity of amino radicals with positive charges are introduced through an ethanediamine crosslinking method to change the charge electrical property of alkali lignin, so that the potential of the prepared flocculant is +20 to 35mV and the flocculant is positive ion type, and the zeta potential is high, the flocculation efficiency is high, and the addition is about 2mg / l. Therefore, the UV254 removal rate and the DOC removal rate respectively reach 80% and 65% without adding other compounding agents. Meanwhile, paper mill sludge is recycled, so that the paper industry is in sustainable development.

The invention discloses a method for preparing a heavy metal adsorbent by using waste polyvinyl chloride plastics, which is characterized in that it comprises the following steps: crushing waste polyvinyl chloride plastics for pretreatment; adding an appropriate amount of catalyst to the crushed plastics, and Stir and mix at high temperature and then airtight, and keep the catalytic reaction warm for a period of time. Cool to room temperature after completion, separate solid and liquid to obtain hydrothermal carbonization product; add appropriate amount of concentrated sulfuric acid, heat and shake for a period of time. After cooling to room temperature, the sulfonated carbonized product is obtained; finally, the sulfonated carbonized product is activated and washed with water to obtain an adsorbent with heavy metal adsorption properties. An appropriate amount of adsorbent can be added to the high-concentration heavy metal solution for adsorption treatment. The invention combines the hydrothermal carbonization method and the concentrated sulfuric acid sulfonation reaction organically to prepare waste polyvinyl chloride plastic resources into an adsorbent, which has a good adsorption effect on high-concentration heavy metals, and at the same time has a simple production process, low cost, low energy consumption, and low resource consumption. recyclable.

The present invention is superior process of preparing nanometer SiO2 with serpentine. Serpentine powder is first refluxed and leached to leach out soluble metal ions and solid matter with porous SiO2 as main component; and the solid matter is further prepared into nanometer SiO2 through a silicon tetrafluoride and sodium silicate process. The present invention has low cost and simple technological process.

The invention relates to a method for preparing a cationic organic flocculant by using paper-making sludge. The method comprises the following steps: directly dissolving a raw material by using an alkali liquid, centrifuging to separate supernate, adjusting the pH value of the solution, putting into a reactor, heating till a certain temperature, adding potassium peroxydisulfate and ethylenediamine tetraacetic acid, introducing nitrogen, stirring to activate for certain time, further adding acrylamide and a dimethyl diallyl ammonium chloride solution to the reactor, continuously introducing nitrogen, stirring for reaction, subsequently pouring into acetone to separate out a reaction product, and drying the filter residue in vacuum, thereby obtaining a flocculant product. When the prepared flocculant is used for treating a simulation water sample, the addition amount is 2mg / l, the UV254 removal rate is about 85%, and the DOC removal rate is about 70%. The method is simple in process, low in equipment requirement and beneficial for industrial production and application, not only is reuse of paper-making wastes achieved, but also the prepared flocculant product is environment-friendly, free of toxicity and high in efficiency, and the water treatment cost can be lowered.

The invention relates to a method for preparing a dispersing-stabilizing agent by using papermaking sludge, which comprises directly dropping NaOH solution in raw materials which are not processed and adding anhydrous sodium sulfite to react for 1.5-2h when temperature rises to 90 DEG C; adding hydrogen peroxide, formaldehyde solution and the anhydrous sodium sulfite for reaction; and finally adding monochloro acetic acid to blend for 2-3h to obtain the dispersing-stabilizing agent containing sodium lignin sulfonate-sodium carboxymethylcellulose. Obtained products have good disperse stability and enable concentration of water-coal-slurry to achieve 67% when using in the water-coal-slurry, viscosity is below 1100mPa*s, no hard sediment is generated after the products are placed for 72h, and mobility is good. The method is simple in process and soft in reaction condition, achieves reutilization of waste, and is capable of being used in industries of water-coal-slurry preparation, oil fields, cement manufacture and the like.

The present invention is a method for efficiently recovering protein from excess sludge. The method comprises the following steps: adding excess sludge WAS into a reaction flask, adding APG in an amount of 0.1-0.5g / gSS, adjusting the initial The pH value is 4.0 to 11.0; after the reaction flask is driven by oxygen and nitrogen for 2-5min, the reaction flask is sealed, and the WAS is hydrolyzed by constant temperature shaking culture; after the pretreated WAS is centrifuged, the excess sludge WAS is completely precipitated , after taking the supernatant, then adding carrageenan to the supernatant, the mass ratio of protein and carrageenan obtained by WAS hydrolysis is 25-1:1, and the pH is adjusted to 1.0-3.0, and the temperature is 30-37 After shaking at ℃ for 15 min, the carrageenan, protein and acid were fully mixed; the mixed solution was centrifuged, and the lower precipitate was the recovered protein. The technology of the invention adopts the technology of combining the complex coagulation method and the acid-base precipitation method after hydrolysis, so that the protein can be recovered to the greatest extent through the combined action of the two.

The invention discloses a method for removing nitrogen and phosphorus from water by using calcium silicate prepared from silicon recycled from red mud, and relates to a method for removing nitrogen and phosphorus from water. By the method, the problems of waste resource utilization and removal of excess nitrogen and phosphorus from water are solved. The method comprises the following steps: leaching most of metal oxides from the red mud by using dilute hydrochloric acid first and then leaching titanium and rare earth elements from the red mud by using concentrated sulfuric acid so as to leave silicon dioxide powder, and then preparing the extracted silicon dioxide into calcium silicate by a hydrothermal method. A certain amount of calcium silicate is added into waste water containing nitrogen and phosphorus, the waste water is oscillated at a certain temperature, ammonia nitrogen is removed from water through gas-liquid separation, and phosphorus is removed from water through ligand exchange and chemical precipitation.

The invention discloses a stabilizing agent for heavy metal contaminated soil and a preparation method and application thereof, and the stabilizing agent comprises the following raw materials: by weight, 20-60% of bone meal; 10-30% of biochar and 20-70% of calcined shell powder. The preparation method is as follows: (1) drying biomass in air and grinding into particles smaller than 60 meshes, cracking in a cracking furnace at 400-800 DEG C for 6-8 hours to obtain the biocar; calcining shell powder with the particle size below 20 meshes in a high temperature furnace at 800-1000 DEG C for 2 to 4 hours, naturally cooling to room temperature to obtain the calcined shell powder; and (2) proportionally mixing the biocar, the calcined shell powder and the bone meal evenly to obtain the stabilizing agent. The stabilizing agent compounding the three components in accordance with a specific proportion solves the problem of high cost, undurable stabilization effect and the like of stabilizing agents for the heavy metal contaminated soil in the prior art.

The invention provides a PEC system for treating ammonia gas and generating electricity by photoelectrically activating persulfate through a transitional bimetallic oxidation composite catalytic material, which belongs to the technology of activating persulfate to purify gas phase pollutants and odorous ammonia gas and other air pollution waste resources. Take advantage of technical areas. The copper-cobalt double metal oxide composite is used as a photocathode for in-situ activation and sprayed on the composite to evaporate and concentrate persulfate to generate sulfate radicals with high oxidation potential. The anode is made of copper rods at K 2 SO 4 Corrosion is formed in the electrolyte solution, and a photoelectrocatalytic system is constructed to accelerate the removal rate of ammonia gas. CuO‑Co in electrocatalytic and photocatalytic systems 3 o 4 Catalytically activated persulfate membranes can not only efficiently remove ammonia, but also use the self-contained energy of ammonia to generate electricity, which provides an idea for the "advanced oxidation technology" based on persulfate activation in the field of air purification.

The invention relates to polyaluminum ferric chloride-paper mill sludge based polymer composite flocculant and a preparation method thereof. The preparation method includes the steps that a paper mill sludge raw material is directly subjected to dissolution and crude extraction through alkali liquor so that lignin can be obtained, a cation-type paper mill sludge based polymer is prepared through graft modification to be reacted with polyaluminum ferric chloride in a mixed mode, and accordingly the novel efficient composite flocculant is prepared. When the obtained flocculant is used for treating a simulated dye water sample and the dosing quantity is 5 mg / L, the chroma removing rate of disperse yellow water samples is stabilized to be above 95%, and meanwhile a good coagulation effect is achieved on both the water samples under the different acidity-alkalinity conditions and other various water samples. The process is simple, the number of needed devices is small, industrialized production and application can be facilitated, and waste recycling is achieved; moreover, the prepared flocculant is high in flocculation efficiency and wide in application range, and a good treatment effect can be achieved on common water body pollutants.

The invention relates to a method for recovering zirconia and yttria from the yttria-stabilized zirconia solid solution waste, which comprises the following steps: mixing the solid solution waste powder, sulfate and salt; acidizing and calcining at 200 to 320 DEG C; leaching the acidizing water and / or mother liquor under self-heating conditions; concentrating the leaching solution to leach zirconium sulfate; dissolving the zirconium sulfate in the water and purifying; neutralizing the zirconium hydroxide with alkali and precipitating; calcining the zirconium hydroxide to obtain zirconia; precipitating zirconium mother liquor to produce by-product of ammonium sulfate; neutralizing yttrium rich mother liquor and precipitating to obtain yttrium; dissolving yttrium rich residue with acid and purifying; precipitating oxalate to obtain yttrium oxalate; calcining to obtain the yttria. The method has the advantages of effectively separating the yttria from the zirconia in stable zirconia solid solution waste with optional yttrium ion under low temperature condition, changing the zirconia solid solution waste into valuables and utilizing the resources.

A VOCs adsorbent prepared by using mycelia solid waste resources and coal and its preparation method, which belong to the field of environmental protection, solid waste utilization and catalysis, can solve the problems of poor adsorption performance and short life of existing adsorbents. , long-flame coal, and semi-coal powder are mechanically mixed in proportion, and uniformly crushed with a sample making machine. The penicillin mycelium is acid-washed and activated, and after being matured, it is mechanically mixed with the above-mentioned coal powder, baking soda and cured starch, and mixed with water. After the mixture is granulated, it is carbonized and washed with water to obtain a high-performance VOCs adsorbent. The invention uses waste mycelium as the main raw material to prepare high-performance VOCs catalyst, which not only solves the problems of low catalyst activity and poor adsorption performance, but also realizes the comprehensive utilization of mycelium solid waste resources and reduces the impact of solid waste on the environment. destroy.

The invention relates to a compound flocculant with polymerization ferric chloride and amination polymers based on papermaking sludge and a method for preparing the compound flocculant. The method includes synthesizing amination polymers from the papermaking sludge generated in the papermaking industry; compounding the amination polymers and the inorganic flocculant polymerization ferric chloride to prepare the compound flocculant with the polymerization ferric chloride and the amination polymers based on the papermaking sludge. The compound flocculant and the method have the advantages that the color removal rate of disperse yellow water samples can reach 95% at least when the compound flocculant is used for treating the simulated dye water samples and the dosing quantity of the compound flocculant is 5 mg / L, excellent flocculation effects can be realized by the compound flocculant for water samples under different acidity and alkalinity conditions and other diversified water samples, the capital construction cost of reaction tanks and sedimentation tanks can be reduced, and the compound flocculant is high in electricity performance and flocculation efficiency, good in dissolving property, long in storage cycle and applicable to the field of water supply, wastewater treatment and the like and suitable for actual application to water treatment.