Optimization of phosphorus removal in municipalities served by regional sludge processing facilities

生物营养物去除（BNR）将逐步在加拿大和世界各地的所有城市污水处理设施中实施。加拿大最新的BNR设施温尼伯西部于2008年10月投产，温尼伯南部和北部BNR升级将于2014年完成。该CRD项目将开发新工艺，这些工艺将在其中至少一个设施中进行试点和全面推广。建议加强目前的方法，总磷（TP）的去除在BNR工厂，以满足/超过新的监管要求。其目的是开发一种方法，其中快速生物降解碳（缩写为rbCOD），将在该过程中从活性污泥生物质中产生，并用于增强磷和硝酸盐的去除。该工艺还将通过加拿大使用镁的新工艺（由其他人）促进磷回收，并将减少产生的废弃生物质的数量。在加拿大和其他地方，在输入的原废水中具有低CIN和C/P比的工厂中对rbCOD有很大的需求。购买rbCOD的中型设施，这样的温尼伯南部是昂贵的（估计超过100万美元/年），而使用这种石化产品显着增加工厂'！碳足迹对当前BNR技术的拟议修改将允许市政当局利用现有基础设施，同时提高污水质量并实施磷的过程中回收。目前的工厂升级项目的成本往往高于预期，因为工厂必须在改造期间充分发挥作用，而传统的单生物质工艺很少允许添加，而是需要新的罐。CRD的结果将使加拿大工程师在世界市场上更具竞争力，因为他们将能够展示传统BNR设计的替代品，这些设计成本更低，环境更可持续。有关市政当局和工程公司的积极参与表明了对拟议研究的兴趣。

Biological nutrient removal (BNR) will gradually be implemented in all municipal wastewater treatment facilities in Canada and around the world. Canada's newest BNR facility Winnipeg-West came on stream in October, 2008 and Winnipeg-South and North BNR upgrades are due by 2014. This CRD Project will develop new processes that would be transferred to pilot and full scale in at least one of those facilities. It is proposed to enhance present methods of total phosphorus (TP) removal in BNR plants to meet/exceed the new regulatory requirements. The objective is to develop a process where rapidly biodegradable carbon (abbreviated rbCOD), would be produced from the activated sludge biomass within the process and used to enhance both phosphorus and nitrate removal. The process would also facilitate phosphorus recovery through a novel Canadian process using magnesium (by others) and will also reduce the amount of waste biomass produced. There is a large demand in Canada and elsewhere for rbCOD in plants with low CIN and C/P ratio in the incoming raw wastewater. Purchasing rbCOD for a medium-size facility, such Winnipeg South is expensive (estimated at over $1M/year) while the use of such petrochemicals significantly increases the plant'! carbon footprint. The proposed modifications to the current BNR technology will allow the municipalities to utilize the existing infrastructure while upgrading effluent quality and practicing in-process recovery of phosphorus. The current plant upgrade projects often cost more than expected as the plants have to fully Function during the retrofit and the traditional one-biomass processes seldom allow add-ons, requiring instead new tanks. Results of this CRD will make the Canadian engineers more competitive on the world markets as they will be able to show alternatives to traditional BNR design that are less expensive and more environmentally sustainable. Eager participation of the municipality involved and the engineering company demonstrates the level of interest in the proposed research.