厌氧-好氧-缺氧短程硝化同步反硝化除磷工艺研究

构建了主要由厌氧-好氧-缺氧构成的短程硝化同步反硝化除磷工艺,并在常温条件下用于生活污水的处理.研究发现,通过调节反应器内好氧区的pH(8.2～8.7)和溶解氧(DO为3～5mg·L-1)能实现该工艺的快速启动,在好氧区内实现亚硝酸盐的累积.在稳定运行期内,DO是影响短程硝化的主要影响因素,好氧1区DO控制在1.5～2.0mg·L-1,好氧2区DO控制在0.5～1.0mg·L-1,好氧区内亚硝酸盐氮累积浓度稳定在5～10mg·L-1,氨氮去除率达到90%以上.各反应单元内碳源、硝酸盐和亚硝酸盐对除磷贡献的研究表明,该工艺的缺氧段实现了在不外加碳源的情况下以亚硝酸盐和硝酸盐共同作为电子受体的反硝化除磷,反硝化除磷量占系统总除磷量的80%以上.

Anaerobic-aerobic-anoxic shortcut nitrification coupled with simultaneous denitrifying phosphorus removal

A novel process consisting of anaerobic-aerobic-anoxic units is designed to achieve shortcut nitrification coupled with simultaneous denitrifying phosphorus removal, and its treatment performance with domestic wastewater was investigated at ambient temperature. This process could start-up quickly by adjusting pH 8.2~8.7 and DO 3~5 mg·L-1 in the aerobic reactor, and nitrite accumulation was obtained. DO was the main factor affecting nitrite accumulation in the steady operating period. The nitrite concentration accumulated to 5~10 mg·L-1 with DO 1.5~2.0 mg·L-1 in aerobic unit 1 and 0.5~1.0 mg·L-1 in aerobic unit 2, while the ammonia removal was above 90% in this system. Analysis of the contributions of COD, nitrite and nitrate to denitrifying phosphorus removal indicated that the denitrifying phosphorus removal using nitrite and nitrate as electron acceptors was achieved in the anoxic unit without addition of an external carbon source, and contributed about 80% to the total phosphorus removal.