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Chemical waste salt purification

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Chemical waste salt refers to solid waste or high-salt waste liquid with inorganic salts as the main component produced in chemical production (such as chlorination, diazotization, acidification, nitrification, oxidation, condensation, etc.) or wastewater treatment processes (such as neutralization, filtration, evaporation, crystallization), mainly including sodium salts, calcium salts, ammonium salts, potassium salts, etc. Its composition is complex and often contains residual reactants, by-products and toxic and harmful organic impurities.

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Traditional treatment methods for chemical waste salt primarily include landfill, dissolved salt crystallization, incineration (high-temperature oxidation), and salt washing. Removing organic matter from chemical waste salt is crucial for purification, and UV-based advanced oxidation technology is an effective method for removing organic matter.

Advanced Oxidation Processes (AOPs)

Organic matter contained in chemical waste salt is often not a single component, but rather a complex mixture of multiple parent compounds, intermediates, and byproducts, each with varying chemical structures, reactivities, and concentrations. While UV-AOPs are considered broad-spectrum oxidation technologies, their degradation rates and pathways for different organic compounds can vary significantly. Achieving the simultaneous, efficient, and complete removal of all organic pollutants requires selecting the appropriate UV-AOP process. UV/H₂O₂ and UV/O₃/H₂O₂ processes offer different options for different waste salt purification processes.

UV-AOPs are typically used as a unit in the entire waste salt treatment process chain (such as pretreatment or advanced treatment). Their efficient operation relies on good coordination and system integration with upstream and downstream process units (such as waste salt dissolution, prefiltration, pH adjustment, subsequent biological treatment, membrane concentration, evaporation and crystallization, etc.). The synergy between different units, the connection of operating conditions, and the placement of intermediate buffers all require careful design and optimization.

Advantages of Advanced Oxidation Technology

· Clean Production: Applying UV-AOPs to the end-of-pipe treatment of chemical waste salts or as an in-process purification enhancement technology can help chemical companies reduce the amount and harmfulness of final waste and improve overall clean production standards.

· Environmentally Friendly: The oxidant H₂O₂ used in the UV/H₂O₂ process ultimately decomposes into water and oxygen, making it considered a relatively green oxidation technology.


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