Municipal biological nutrient removal bioreactor upgrade using integrated fixed-film activated sludge (IFAS): Pilot scale investigation

未经处理的含氮磷废水会引起富营养化，延长藻类的生长时间，降低河流和湖泊的氧气浓度。为了防止富营养化和节约饮用水水源，必须对废水中的氮和磷进行去除。活性污泥生物脱氮(BNR)系统是污水生物脱氮工艺的核心技术。然而，在加拿大，在寒冷的冬季和高流量(融雪)季节，这些类型的系统在氨去除方面经常受到影响。 拟议的研究将评估在现有活性污泥生物反应器中添加固定和流动生物膜基质(即IFAS系统)的效果，以便在寒冷的冬季和高流量条件下显著增强生物营养物质的去除。在埃德蒙顿市的EPCOR Gold Bar污水处理厂，将分别在两个中试规模的生物反应器中对固定和移动生物膜载体进行评估，以实现最佳的营养去除效率。本研究的结果将为现有生物脱氮系统的升级改造确定合适的基质，并为今后的大规模试验提供参考。这种处理方式将为加拿大带来显著的经济和环境效益。参加这一CRD项目的高素质人员将获得学术和行业知识和经验，这将加强艾伯塔省和加拿大在废水处理管理方面的能力。

Untreated wastewater containing nitrogen and phosphorus can cause eutrophication which extends algae growth and decreases oxygen concentration in river and lake. To prevent eutrophication and conserve drinking water source, nitrogen and phosphorus should be removed from wastewater. Biological nutrient removal (BNR) systems using activated sludge are the core technology of the biological wastewater treatment process for ammonia removal. However, these types of systems are often compromised in Canada during cold winter and high flow (snow melting) seasons in terms of ammonia removal. The proposed study will evaluate the effectiveness of fixed and mobile biofilm media addition (i.e., IFAS systems) to the existing activated sludge bioreactors for significantly enhanced biological nutrient removal under cold winter and high flow conditions. Fixed and mobile biofilm support media will be evaluated separately in two pilot scale bioreactors that are operated to achieve optimal nutrient removal efficiency at the EPCOR Gold Bar Wastewater Treatment Plant in the City of Edmonton. The results of this research will determine the appropriate media to upgrade a full-scale existing biological nutrient removal system, and will provide a reference for full-scale testing in the future. Such treatment will provide significant economic and environmental benefits to Canada. The highly qualified personnel participating in this CRD Program will obtain academic and industrial knowledge and experience that will strengthen Alberta's and Canada's capacities in wastewater treatment management.