Development of a 2-sludge, 3-stage system for nitrogen and phosphorous removal from nutrient-rich wastewater using granular sludge and biofilms.
Development of a 2-sludge, 3-stage system for nitrogen and phosphorous removal from nutrient-rich wastewater using granular sludge and biofilms.
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DOI：
10.1016/j.watres.2008.04.012
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发表时间：
2008-06
期刊：
影响因子：
12.8
通讯作者：
Yan Zhou;M. Pijuan;Zhiguo Yuan
中科院分区：
文献类型：
--
作者：
Yan Zhou;M. Pijuan;Zhiguo Yuan
采用颗粒污泥与生物膜相结合的两泥三级工艺处理富营养化废水。该系统由一个颗粒序批式反应器（SBR）交替厌氧/缺氧条件下工作，辅以短的好氧相和好氧生物膜SBR。首先将废水进料至颗粒SBR反应器，其中容易生物降解的碳源主要被聚磷酸盐积累生物体（PAO）吸收。然后将颗粒污泥快速沉降产生的上清液进料至生物膜SBR进行硝化，其产生的氧化氮返回至颗粒反应器进行同时脱氮和除磷。在最大限度地利用有机基质和降低运行成本，如其他2污泥工艺以前在文献中报道，所提出的系统解决了传统的2污泥系统的瓶颈问题，即高出水氨浓度，由于其高体积交换比。在生物膜SBR中，氨氧化速率达到32 mgN/Lh，最终产物为亚硝酸盐。这亚硝酸盐流被认为是造成主要抑制缺氧的P吸收，也导致N2 O的积累。这些问题通过将含亚硝酸盐的流连续进料到缺氧阶段的颗粒反应器中来解决。该系统对总氮270 mgN/L、总磷40 mgP/L的污水处理后，出水氮、磷去除率分别为81%和94%。
A novel 2-sludge 3-stage process using a combination of granular sludge and biofilm was developed to achieve biological removal of nitrogen and phosphorus from nutrient-rich wastewater. The system consists of a granular sequencing batch reactor (SBR) working under alternating anaerobic/anoxic conditions supplemented with a short aerobic phase and an aerobic biofilm SBR. The wastewater is first fed to the granular SBR reactor, where easily biodegradable carbon sources are taken up primarily by polyphosphate accumulating organisms (PAOs). The supernatant resulting from quick settling of the granular sludge is then fed to the biofilm SBR for nitrification, which produces oxidized nitrogen that is returned to the granular reactor for simultaneous denitrification and phosphorus removal. While maximizing the utilization of organic substrates and reducing operational costs, as do other 2-sludge processes previously reported in literature, the proposed system solves the bottleneck problem of traditional 2-sludge systems, namely high effluent ammonia concentration, due to its high-volume exchange ratios. An ammonia oxidation rate of 32mgN/Lh was achieved in the biofilm SBR, which produced nitrite as the final product. This nitrite stream was found to cause major inhibition on the anoxic P uptake and also to result in the accumulation of N2O. These problems were solved by feeding the nitrite-containing stream continuously to the granular reactor in the anoxic phase. With a nitrogen and phosphorus removal efficiency of 81% and 94%, respectively, the system produces an effluent that is suitable for land irrigation from a wastewater stream containing 270mgN/L of total nitrogen and 40mgP/L of total phosphorus.