6results about How to "The reduction effect is obvious" patented technology

The invention relates to the technical field of sludge treatment, and discloses a sludge treatment method based on sludge reduction and ammonia nitrogen recovery, which comprises the following steps: 1) alkali thermal hydrolysis: adding alkali into sludge to adjust the pH value to 9-11, and carrying out thermal hydrolysis reaction; (2) wet oxidation: heating after reaction and discharging, and carrying out wet oxidation reaction; (3) flash evaporation: carrying out heat recovery after reaction discharging, and carrying out flash evaporation to obtain a sludge mixed solution and flash evaporation steam; (4) dewatering: performing heat recovery on the sludge mixed solution, and then dewatering to obtain a sludge cake and filtrate; and (5) ammonia nitrogen air stripping: carrying out ammonia nitrogen air stripping on the filtrate by adopting steam, wherein the filtrate after air stripping can be reused as a carbon source for sewage treatment. According to the method, the oxidative degradation efficiency of the sludge is improved through coupling of alkali thermal hydrolysis and wet oxidation treatment, ammonia nitrogen recovery and sludge reduction are facilitated, and the filtrate has the characteristics of high COD and low total nitrogen and is more suitable for being used as a carbon source.

The invention discloses a municipal sludge and kitchen waste cooperative treatment system and method. The treatment system comprises a sludge bin, a kitchen waste bin, a sludge storage tank, an anaerobic digestion tank, a conditioning reactor, a rear sludge storage tank and a plate-and-frame filter press. The sludge bin and the kitchen waste bin are respectively connected to the sludge storage tank through pipelines, so that municipal sludge and kitchen waste are mixed in the sludge storage tank; the sludge storage tank, the anaerobic digestion tank, the conditioning reactor, the rear sludge storage tank and the plate-and-frame filter press are sequentially connected through pipelines, and the conditioning reactor is further connected with the ozone generator, the UV photocatalytic oxidation equipment and the H2O2 dosing device, so that the purpose of treating municipal sludge and kitchen waste through ozone and hydrogen peroxide coupled photocatalytic oxidation is achieved. The sludge dewatering device has the characteristics of compact structure, high stability, high treatment efficiency and the like, and achieves the effects of high-efficiency sludge dewatering, obvious reduction and low operation cost.

The invention discloses a continuous arsenic sulfide slag drying treatment system and method for corrosive waste gas filtration, and belongs to the technical field of hazardous waste treatment.The system comprises a box, and a closed feeding unit, a sectional type low-temperature drying unit and a discharging unit are arranged in the box; the sectional type low-temperature drying unit is circularly communicated with the corrosion protection unit and the heating air supply unit; the corrosion protection unit comprises a dry type filter unit, a wet type filter unit, a water condenser and a steam preheating recoverer, and is used for realizing graded purification, condensation dehumidification and heat energy recovery of corrosive waste gas; the heating air supply unit provides heated circulating air for the drying unit, and the sectional type low-temperature drying unit adopts a PVC + nylon anti-corrosion mesh belt and an ash removal scraping belt, so that closed drying and anti-scattering ash removal of materials are realized. According to the method, the whole-process closed drying of the arsenic sulfide slag is achieved, the weight reduction rate reaches 40% or above, the corrosive gas removal rate reaches 98% or above, the energy utilization rate is high, and the method is suitable for large-scale treatment of the arsenic sulfide slag in the non-ferrous metal smelting industry.

This invention relates to a method for the resource recovery of rare earth, thorium, and iron from iron-thorium slag. The method includes the following steps: (1) finely grinding the iron-thorium slag; (2) uniformly mixing the finely ground iron-thorium slag with reducing carbon powder, and then roasting them together in a muffle furnace to obtain roasted slag; (3) mixing the roasted slag with alkaline solution and then placing it in a sealed container for high-temperature alkaline conversion reaction to obtain alkaline conversion slag; (4) washing the alkaline conversion slag with water to remove fluoride and aluminum, and then filtering and drying it to obtain water-washed slag; (5) subjecting the water-washed slag to acid dissolution reaction, and after separation, obtaining a thorium-containing rare earth solution and an acid-leached slag respectively; (6) after deep impurity removal, transferring the thorium-containing rare earth solution to an extraction system to separate and purify rare earth and thorium elements. This invention solidifies most of the iron in the iron-thorium slag in the form of goethite through high-temperature roasting, avoiding the loss of rare earth caused by the subsequent leaching process, and has the advantages of high rare earth recovery rate, low slag rate, and low auxiliary material consumption.

The invention relates to the technical field of water treatment, in particular to an iron phosphate production wastewater treatment method and system. The method comprises the following steps: carrying out first desalination on iron phosphate production wastewater to obtain first concentrated water and first fresh water; combining the first concentrated water with the mother solution to obtain a first combined solution, carrying out second desalination on the first fresh water under a first pH condition to obtain second fresh water, and recovering the second fresh water; removing a first type of impurities from the first combined liquid under a second pH condition to obtain first produced water and first sludge; carrying out third desalination on the first produced water under an acidic condition to obtain third concentrated water and third fresh water; sending the third concentrated water to MVR evaporation crystallization recovery, and carrying out fourth desalination on the third fresh water to obtain fourth fresh water; the fourth fresh water and the first fresh water are combined for desalination, or the fourth fresh water is subjected to second desalination under the first pH condition. Therefore, the problems that the TDS content is low and the water amount is large when the ammonium-process ferric phosphate production wastewater enters the MVR are solved.

The invention discloses an efficient resourceful treatment method of firework and firecracker waste residues, which comprises the following steps: S1, sulfur dissolving separation: placing the firework and firecracker waste residues in a sulfur dissolving agent, and carrying out hot filtration separation to obtain a sulfur-containing clear liquid and desulfurized residues; cooling and separating out the sulfur-containing clear liquid, and carrying out solid-liquid separation to obtain sulfur and a sulfur dissolving liquid; s2, slurrying and leaching: adding the desulfurization residues into concentrated sulfuric acid to carry out slurrying reaction, dissolving magnesium and aluminum components, and carbonizing and decomposing lead fibers at the same time; s3, solid-liquid separation and flotation: diluting and cooling the material after the pulpifying reaction, and carrying out solid-liquid separation to obtain a leachate containing magnesium and aluminum ions and residues after leaching; and S4, magnesium aluminate spinel preparation: adjusting the pH value of the leachate to separate out magnesium and aluminum in a precipitation form, filtering, drying filter residues, and calcining to obtain the magnesium aluminate spinel. According to the method, sulfur, magnesium, aluminum and other resources in the waste residues can be safely and efficiently separated and recycled, meanwhile, the final residues are subjected to harmlessness, the amount and volume of the residues are greatly reduced, and the method is suitable for industrial-scale continuous production.