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

生物去除营养物质(BNR)将逐步在加拿大和世界各地的所有市政污水处理设施中实施。加拿大最新的温尼伯-韦斯特BNR设施于2008年10月投产，温尼伯-南部和北部的BNR升级将于2014年完成。这个CRD项目将开发新的工艺，这些工艺将在至少其中一个设施中转移到试点和全面规模。建议改进BNR厂现有的总磷(TP)去除方法，以达到/超过新的法规要求。其目的是开发一种工艺，其中快速生物降解碳(简称rbCOD)将从工艺中的活性污泥生物质中产生，并用于加强磷和硝酸盐的去除。该过程还将通过(由其他人)使用镁的加拿大新工艺促进磷的回收，并将减少产生的废物生物质的数量。加拿大和其他地方对原水中CIN和C/P比值较低的工厂的rbCOD的需求量很大。购买rbCOD用于中等规模的设施，这样的温尼伯南部是昂贵的(估计超过100万美元/年)，而这种石化产品的使用显著增加了工厂‘！碳足迹。对当前BNR技术的拟议修改将使市政当局能够利用现有的基础设施，同时提高污水质量并进行过程中的磷回收。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，而传统的单一生物质工艺很少允许增加设备，而需要新的储罐。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设计的替代方案，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热切参与表明了对拟议研究的兴趣程度。

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.