5 results about "Ammonium oxidation" patented technology

The application relates to the technical field of ammonium oxidation, and discloses an anode material for ammonium oxidation under a low-concentration chloride ion condition and a preparation method thereof.The anode material takes manganese dioxide as a carrier and is loaded with monatomic silver, and the loading amount of the monatomic silver is less than 0.1 wt%.In the preparation process, first, constant current density electrodeposition is carried out to prepare a MnO2 / platinum-coated titanium mesh; then, a wet chemical immersion method is used to load Ag on the MnO2 substrate; finally, high-temperature air atmosphere calcination is carried out to prepare a monatomic Ag / MnO2 anode material.The application utilizes the acid resistance of MnO2 itself and the strong metal carrier interaction between metal Ag and MnO2 to realize stable and continuous electrolysis operation; and Ag and MnO2 realize the enrichment of low-concentration chloride ions at the anode interface through chemical affinity and physical adsorption, thereby realizing the efficient generation of active chlorine under the condition of low-concentration chloride ions.

The invention relates to the technical field of hot sherardizing coatings, in particular to a production process for improving the corrosion resistance of a hot sherardizing coating, which comprises the following steps: after a metal workpiece is subjected to acid pickling derusting treatment, stainless steel grit is adopted for shot blasting treatment; preparing furnace charge, mixing 50 parts by mass of zinc powder with a specific particle size, 30 parts by mass of aluminum oxide, 20 parts by mass of zinc oxide, 3 parts by mass of graphite powder, 2 parts by mass of cerium oxide, 2 parts by mass of lanthanum oxide, 2 parts by mass of ammonium oxide and 3 parts by mass of zirconium oxide according to a set mass ratio, adding a zircon sand carrier, and uniformly stirring; according to the method, the pretreatment process is standardized, a 10% hydrochloric acid solution is adopted for acid pickling and matched with deionized water for flushing, and then stainless steel grit shot blasting is conducted according to specific parameters, so that the effects of thoroughly removing oxide skin, rust and residual acid liquor on the surface of the workpiece, optimizing the surface roughness and providing a good substrate for zinc atom diffusion bonding are achieved.

This invention belongs to the field of wastewater treatment. It provides a manganese-supported sulfur-rich Spartina alterniflora denitrification material, its preparation method, and its application. This manganese-supported sulfur-rich Spartina alterniflora denitrification material is obtained by alkali-modified sulfur-rich Spartina alterniflora or alkali-modified sulfur-rich Spartina alterniflora biochar loaded with manganese oxides. The manganese-supported sulfur-rich Spartina alterniflora denitrification material of this invention has abundant pores and a large specific surface area, which is beneficial for the adsorption, catalytic oxidation, and microbial biofilm formation of nitrogen pollutants. It is also rich in carbon, sulfur, and manganese, and can directly release organic carbon sources. It can achieve efficient denitrification through multiple processes such as coupled nitrification, manganese ammonium oxidation, heterotrophic denitrification, manganese autotrophic denitrification, and sulfur autotrophic denitrification. The manganese-supported sulfur-rich Spartina alterniflora denitrification material of this invention is fixed on the surface of hard aggregates, elastic or soft carriers, and can be widely used in constructed wetlands, biological filters, deep denitrification in wastewater treatment plants, rural and agricultural wastewater treatment, and initial rainwater purification.

The present application relates to a kind of road vehicle carbon ceramic brake disc with organic ceramic brake pad and its preparation method, raw material includes the following components by weight percentage: phenolic resin 1~4%, boron modified phenolic resin 1~5%, aluminum metaphosphate 4~15%, sodium silicate 3~7%, ammonium fluoride 1~3%, magnesium oxide 1~5%, copper oxide 3~5%, aluminum powder 2~6%, carbon fiber 1~6%, aramid pulp 1~6%, steel fiber 8~15%, reduced iron powder 15~20%, red copper powder 6~12%, antimony oxide 1~3%, zinc borate 5~8%, diantimony trisulfide 2~6%, molybdenum disulfide 4~6%, calcined petroleum coke 5~8%, aluminum titanate 1~5%, titanium oxide 1~4%, zirconium oxide 5~12%, silicon carbide 4~8%, dichromic anhydride 2~6%.The brake pad of the present application has good friction coefficient stability, wear resistance, solves the technical bottleneck of existing carbon ceramic brake disc brake pad.

This invention discloses an apparatus and method for coupling ferroammonia oxidation and anaerobic ammonia oxidation of Fenton waste sludge, comprising an influent tank, a five-stage reactor, a secondary sedimentation tank, and a Fenton reactor connected in sequence. This invention enriches the ferroammonia-oxidizing bacteria in the activated sludge by recirculating the sludge (containing ferric iron) produced in the Fenton reactor to the five-stage reactor. The nitrite and nitrate nitrogen produced by ferroammonia oxidation are directly or indirectly utilized by anaerobic ammonia-oxidizing bacteria on the packing material for anaerobic ammonia oxidation. The nitrate nitrogen produced in the aerobic zone can be denitrified using carbon sources and ammonia nitrogen in the influent through short-cut denitrification anaerobic ammonia oxidation. This invention achieves volume reduction and harmless treatment of Fenton waste sludge, achieving high nitrogen and phosphorus removal efficiency in industrial wastewater while removing recalcitrant organic matter.