With the rapid development of the high-tech industry and its related supply chains, Taiwan has seen a significant increase of NH3-N and NO3-N in the effluent. In response to the strengthened or newly introduced discharge standards by the Ministry of Environment, industries have begun to search for optimal treatment methods for nitrogen-containing wastewater. Particularly, industries such as the chemical and metal surface treatment sectors, which generate NO3-N containing wastewater, often face challenges like poor denitrification performance in existing units and limited space for expansion. Thus, there is an urgent need for innovative solutions. Furthermore, in certain areas, such as camping sites, public areas, and communities, sewage lacks proper management and is constrained by limited space, making traditional nitrification-denitrification biological treatment ineffective in these specific regions. Therefore, there is a pressing need to develop a biological treatment system that is low in sludge production, energy-efficient, and resilient to environmental impacts. Last year, our team successfully utilized catalytic reduction technology and polyvinyl alcohol (PVA) bio-pellet technology to treat nitrate nitrogen in wastewater. This year, we have further improved both of these technologies and constructed packaged modular systems. For the treatment of refractory NO3-N wastewater, we have modified the denitrification catalyst (DNC+) with reduced dosing of reducing agents, resulting in a significant increase in NO3-N removal compared to the unmodified catalyst used last year. The denitrification bio-pellets have shown good performance in treating higher conductivity wastewater from metal surface treatment industries. In addition, sewage can be divided into three groups based on the carbon/nitrogen (C/N) ratio of the site-specific water quality characteristics. Bio-pellet tests were conducted using different biological aerobic/anoxic units, confirming the feasibility of intermittent aeration to save 50% of aeration power cost while maintaining stable concentrations of NH3-N and NO3-N to meet the discharge standards. In terms of on-site verification of industrial NO3-N wastewater, our team has constructed denitrification bio-pellets and catalytic reduction modular systems, each equipped with pretreatment dosing systems and remote data collection and monitoring functions. These systems have been tested and have shown promising results at a stainless steel plant. For on-site verification of sewage treatment, our team successfully verified the bio-pellet treatment technology in the Shunshi Village in Taoyuan, and also assisted a high-tech company in designing, building, and start-up the bio-pellet nitrification system for 120 CMD of sewage. We conducted on-site interviews with six companies and organized expert consultation meetings. We also held the Promotion of Emerging Wastewater Treatment Technologies ＆ Taiwan-India Forum on Sustainable Water Environment. In addition, 2 brochures were made as technical textbooks, the contents of this project were filmed, and the results of this project were published in domestic journals and seminars.

Ammonia, Nitrate, Catalyst, Bio-pellet, Pilot