Two-stage sulfide wastewater degradation device based on hydrodynamic cavitation

Abstract

A two-stage sulfide wastewater degradation device based on hydrodynamic cavitation comprises a cavitation jet pipe and a reaction cavity, one end of the cavitation jet pipe is provided with a liquid inlet and an oxidizing agent channel, the other end of the cavitation jet pipe is provided with a nozzle, a throat part is arranged between the liquid inlet and the nozzle in the cavitation jet pipe, and a conical incidence section is arranged between the liquid inlet and the throat part. A conical ejection section is arranged between the nozzle and the throat part, a reaction cavity is formed in the reaction cavity, one end of the nozzle of the cavitation jet pipe is connected with the reaction cavity, the nozzle is located in the reaction cavity, a fluid changing body is arranged in the reaction cavity, and a liquid discharging opening is formed in the other end of the reaction cavity. According to the device, wastewater and an oxidizing agent injected by the oxidizing agent channel are mixed at the throat part of the jet pipe, a cavitation effect is generated, and a first-stage cavitation reaction is carried out; the high-speed fluid injected into the reaction chamber from the nozzle impacts the modified fluid, and the secondary cavitation reaction is completed in the reaction chamber, so that the sulfide in the wastewater is efficiently degraded, the treatment effect is good, the treatment capacity is large, and continuous operation can be realized.

Description

technical field [0001] The invention relates to a device for realizing the degradation of sulfide in waste water through a two-stage hydraulic cavitation technology, and belongs to the technical field of pollutant degradation. Background technique [0002] Sulfides are pollutants, and their content is an important evaluation standard for water quality. They are mainly derived from the processing and use of fossil fuels. Their acidity poses a serious threat to the entire ecosystem, causing corrosion of metal and concrete elements and a large consumption of water and oxygen. In addition, wastewater containing trace amounts of sulfide will poison the catalyst, resulting in the failure of the catalytic reaction to proceed normally. Sulfide-rich industrial wastewater must be treated before being discharged into the environment. At present, the treatment methods of sulfur-containing wastewater mainly include physical, chemical and biological methods. [0003] Among them, the phy...

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Problems solved by technology

Among the three methods, the physical method is the simplest. The chemical method consumes a lot of chemicals and produces a large amount of waste residue when the sulfur content in the wastewater is high, so it is not suitable for treating wastewater with a high sulfur content; the biological method uses microorganisms to oxidize sulfide In addition, due to the limitation of microbial tolerance, the efficiency of treating wastewater with high sulfur content is low, so it is not suitable for treating wastewater with high sulfur content

The use of advanced oxidation techniques, such as Fenton oxidation, is not feasible if pH adjustment from strongly alkaline to acidic would result in the emission of hydrogen sulfide gas

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