基于固态碳源的同步硝化反硝化反应器对海水养殖废水中氮的去除性能

通过批次实验考察了非生物作用下3-羟基丁酸/戊酸酯共聚物(PHBV)的有机碳释放规律；以PHBV颗粒和陶粒作为填料建立了填充柱生物膜反应器，并通过长期(90 d)运行考察了其对海水养殖废水中氮的去除性能。结果表明，非生物作用下PHBV难以向水体中释放有机碳；以PHBV作为固态碳源的生物膜反应器可以实现同步硝化反硝化。反应器运行状态(HRT为2 h)稳定后，氨氮和总氮的去除率分别为(91.8±1.3)%和(87.5±2.2)%，硝化速率和反硝化速率分别为0.11 g·(L·d)⁻¹和0.20 g·(L·d)⁻¹。
填充柱沿水流方向可以分为2个区段，0~20 cm柱体内主要进行同步硝化反硝化过程，20~100 cm柱体内主要进行反硝化过程；反应器中微弱的亚硝酸盐积累可以归因于短程反硝化。以上研究成果可以为海水养殖业绿色发展提供参考。

Performance of simultaneous nitrification and denitrification reactor based on solid-phase carbon source on nitrogen removal from mariculture wastewater

Batch experiments were conducted to investigate the organic carbon release of poly-3-hydroxybutyrate-co-hyroxyvelate (PHBV) under abiotic condition. A biofilm reactor packed with PHBV granules and ceramsite was established and operated for 90 d to determine its performance on nitrogen removal from mariculture wastewater. Batch experiment results indicate that the negligible release of organic carbon from PHBV to water occurred under abiotic condition. Simultaneous nitrification and denitrification could be achieved in the biofilm reactor utilizing PHBV as solid-phase carbon source. When the biofilm reactor reached steady-state operation status (HRT = 2 h), the removal efficiencies of ammonia and total nitrogen were (91.8±1.3)% and (87.
5±2.2)%, respectively, together with the nitrification rate of 0.11 g·(L·d)−1and the denitrification rate of 0.20 g·(L·d)−1. The packed-bed reactor could be divided into two distinct sections, namely, the section of 0~20 cm for simultaneous nitrification and denitrification and the section of 20~100 cm for denitrification. Slight nitrite accumulation in the packed-bed reactor could be attributed to the short-cut denitrification. Therefore, the achievements of this study could provide a technical support for the green development of mariculture.