Discuss methods for treating polyvinyl formaldehyde wastewater
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This post was last edited by mywlyx on 2009-10-11 at 14:15. Our company produces polyvinyl formal, and a large amount of wastewater is generated during the precipitation process. This wastewater contains lipids, alcohols, acids, as well as unprecipitated low-molecular-weight PVF and PVA. Among them, lipids, alcohols, and acids are easy to handle; they account for only 50% of the COD. The remaining 50% consists of those water-soluble low-molecular-weight substances, some of which are dissolved in water while others are dissolved in organic solvents. For biological treatment, it is necessary to remove those low-molecular-weight PVA and PVF first; but what methods are there to remove these substances? The wastewater volume is 25 T per day, of which 1% consists of soluble solids. The COD level is 400,000 mg/L. The methods I know right now are: 1. Flocculation. This method is effective, but it requires a large amount of flocculant, and it generates a lot of sediment, resulting in secondary pollution. Dealing with these precipitates is also very troublesome. 2. Filtration: Using membrane filtration as it is currently available is likely not feasible, as what needs to be filtered are not solid particles but soluble, viscous substances that can clog the filter pores and are difficult to clean. 3. Distillation: The liquid is evaporated, leaving behind a solid substance (a very viscous material). However, using this method to process 25T per day requires a large amount of energy, so the costs are likely to be too high. Do anyone else have any good ideas? ? ? ? ? Everyone is welcome to discuss; there are scores! ! {:3_57:} Manufacturers with relevant processing equipment are also welcome to get in touch with me! {:3_57:}
I’m not sure whether internal electrolysis can be used to decompose small-molecule PVA and PVF, followed by anaerobic biological treatment or hydroxyl acidification and aerobic biological treatment – I wonder what the results would be No tests have been conducted to determine whether strong oxidants can decompose PVA and PVF. LZ, you can conduct experiments using oxidative or biochemical methods.
This post was last edited by cdpulin on 2009-10-12 at 13:10. Internal electrolysis and oxidative decomposition are difficult to apply to PVA and PVF, and they are also very costly! {:2_33:}
Are there any other good ways? ? ? {:2_41:}