Yilmaz Gulsum, Lemaire Romain, Keller Jurg, Yuan Zhiguo
Advanced Water Management Centre (AWMC), The University of Queensland, St. Lucia, QLD 4072, Australia.
Biotechnol Bioeng. 2008 Jun 15;100(3):529-41. doi: 10.1002/bit.21774.
The biological removal of nitrogen and phosphorus from nutrient-rich abattoir wastewater using granular sludge has been investigated. A lab-scale sequencing batch reactor, seeded with granular sludge developed using synthetic wastewater, was operated for 13 months under alternating anaerobic and aerobic conditions. It is demonstrated that the granules could be sustained and indeed further developed with the use of abattoir wastewater. The organic, nitrogen, and phosphorus loading rates applied were 2.7 gCOD L(-1) day(-1), 0.43 gN L(-1) day(-1), and 0.06 gP L(-1) day(-1), respectively. The removal efficiency of soluble COD, soluble nitrogen and soluble phosphorus were 85%, 93%, and 89%, respectively. However, the high suspended solids in the effluent limited the overall removal efficiency to 68%, 86%, and 74% for total COD, TN, and TP, respectively. This good nutrient removal was achieved through the process known as simultaneous nitrification, denitrification, and phosphorus removal, likely facilitated by the presence of large anoxic zones in the center of the granules. The removal of nitrogen was likely via nitrite optimizing the use of the limited COD available in the wastewater. Accumulibacter spp. were found to be responsible for most of the denitrification, further reducing the COD requirement for nitrogen and phosphorus removal. Mineral precipitation was evaluated and was not found to significantly contribute to the overall nutrient removal. It is also shown that the minimum HRT in a granular sludge system is not governed by the sludge settleability, as is the case with floccular sludge systems, but likely by the limitations associated with the transfer of substrates in granules.
研究了利用颗粒污泥对营养丰富的屠宰场废水进行生物脱氮除磷。一个实验室规模的序批式反应器，接种了使用合成废水培养的颗粒污泥，在厌氧和好氧交替条件下运行了13个月。结果表明，使用屠宰场废水可以维持颗粒污泥并使其进一步发展。所应用的有机、氮和磷负荷率分别为2.7 gCOD L(-1)天(-1)、0.43 gN L(-1)天(-1)和0.06 gP L(-1)天(-1)。可溶性COD、可溶性氮和可溶性磷的去除效率分别为85%、93%和89%。然而，出水的高悬浮固体将总COD、TN和TP的总体去除效率分别限制在68%、86%和74%。这种良好的营养物去除是通过同步硝化、反硝化和除磷过程实现的，这可能得益于颗粒中心存在的大缺氧区。氮的去除可能是通过亚硝酸盐实现的，从而优化了废水中有限COD的利用。发现聚磷菌属负责大部分反硝化作用，进一步降低了脱氮除磷所需的COD。对矿物沉淀进行了评估，发现其对总体营养物去除的贡献不显著。研究还表明，颗粒污泥系统中的最小水力停留时间不像絮状污泥系统那样受污泥沉降性能的控制，而是可能受颗粒中底物转移相关限制的控制。
