英文摘要 |
Facing the increasingly stringent ammonia nitrogen wastewater discharge standards, there has been a continuous development of emerging wastewater treatment technologies over the years, aiming to separate ammonia nitrogen from wastewater for resource recycling and reuse. This year, building on the results of previous ammonia nitrogen wastewater treatment technologies, the focus will be on refining the ammonia nitrogen resource recovery techniques, including the "Capacitive Ammonia Nitrogen Enrichment System" and the "Energy-Efficient Ammonia Nitrogen Stripping System." Plans are in place to gradually scale up the technology, conduct pilot plant verification, and proceed with technology transfer and demonstration promotion starting next year. The ultimate goal is to encourage the industry to make good use of valuable nitrogen resources in wastewater, fostering collaboration between the industrial, governmental, and academic sectors to move toward the goal of "net-zero carbon emissions and resource recycling" in wastewater treatment.
This year's project plans to build a semi-automated laboratory-scale "Capacitive Ammonia Nitrogen Enrichment System" based on the outcomes of previous projects. It targets industrial ammonia nitrogen wastewater with low concentrations that are difficult to treat. Through the regulation of the charging/discharging operation mode, ammonium ions will be separated from the water during the charging adsorption process for water regeneration. At the same time, during the discharging desorption process, system circulation operations will be conducted through system-controlled design, effectively enriching ammonium ions. This ensures that the ammonia nitrogen concentrate discharged during the complete discharging phase reaches the target concentration. The control modes will be upgraded from the previous three modes (desalination, regeneration, and concentration discharge) to five modes (desalination, regeneration, concentration, concentration discharge, and replenishment), enhancing the efficiency of subsequent resource recycling processes.
After ammonia nitrogen enrichment and concentration is completed using high-efficiency ammonia nitrogen concentration technology, the "Energy-Efficient Ammonia Nitrogen Stripping System" will be introduced. Heat will be transferred from the washing solution (hydrochloric acid or pure water) to the concentrated ammonia nitrogen wastewater, improving the ammonia nitrogen stripping and separation efficiency by raising the temperature of the ammonia nitrogen wastewater. Additionally, by lowering the temperature of the washing solution, the ammonia concentration in the washing solution is increased, allowing the ammonia nitrogen in the wastewater to be refined and reused as ammonia water.
Finally, following the life cycle assessment method, carbon emissions will be quantified to calculate the environmental benefits, and recommendations for technology development will be proposed to maximize the carbon reduction benefits of ammonia nitrogen wastewater treatment, aiming to achieve the goals of resource recycling and net-zero emissions. Moreover, through expert consultation meetings, suggestions from various sectors, including industry, government, and academia, will be consolidated to propose improvements for net-zero emissions and ammonia nitrogen resource recovery technology. On-site interviews will also be conducted to facilitate ammonia nitrogen wastewater treatment technology exchanges, providing solutions to the issues encountered by industry players and helping them improve the efficiency of their ammonia nitrogen wastewater treatment technologies.
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