Aerobic domestic waste water treatment in a pilot plant with complete sludge retention by cross-flow filtration
Aerobic domestic waste water treatment in a pilot plant with complete sludge retention by cross-flow filtration
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DOI：
10.1016/0043-1354(94)00267-b
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发表时间：
1995-04
期刊：
影响因子：
12.8
通讯作者：
E. Muller;A. H. Stouthamer;H. W. Verseveld;D. Eikelboom
中科院分区：
文献类型：
--
作者：
E. Muller;A. H. Stouthamer;H. W. Verseveld;D. Eikelboom
一个好氧污水处理中试厂与错流过滤运行超过300天，以检查是否减少污泥产量和稳定的处理性能时，可以实现污泥完全保留。容积负荷在0.9和2.0 g COD·1 - 1·day-1之间。技术意见如下：在高污泥浓度下，氧传递速率变差;膜容量下降，但可通过清洗基本上充分恢复。当混合液悬浮固体（MLSS）浓度增加到40-50 g·1 - 1时，几乎不产生污泥。然后，污泥负荷仅为0.021 g CD·g MLSS-1·day-1，仅6%的碳被同化。在过去的200天里，随着污泥中无机化合物的含量从21.6%增加到23.5%，非挥发性化合物几乎没有积累，而碳、磷和凯氏氮含量则保持稳定。300天后，污染的微量元素，如汞，铅和镉的含量，类似于传统的处理厂供应这种废水。碳和凯氏氮的去除总是相当令人满意的。碳总是被去除超过90%，未被同化的凯氏氮在任何时候都被完全硝化。在30°C下，硝化能力恒定在0.2 mmol·g MLSS−1·h−1左右，这表明硝化种群的活力并未停止。此外，高达40%的氮供应的损失作为反硝化的结果。因此，当在高水力负荷下应用完全污泥保留时，可以实现稳定的处理性能和非常低的污泥产生。
An aerobic wastewater treatment pilot plant with cross-flow filtration was operated for more than 300 days to examine whether reduced sludge production and stable treatment performance can be achieved when sludge is completely retained. The volumetric loads ranged between 0.9 and 2.0 g COD·1−1·day−1. Technical observations were: the oxygen transfer rate became poor at high sludge concentrations; membrane capacities declined but could be mostly sufficiently restored by cleaning. Sludge was hardly produced when the mixed liquor suspended solid (MLSS) concentration had increased to 40–50 g·1−1. Then, the sludge load was only 0.021 g CD·g MLSS−1·day−1and only 6% of the carbon supplied was assimilated. Non-volatile compounds hardly accumulated as the fraction of inorganic compounds in sludge increased from 21.6 to 23.5% during the last 200 days, whereas the carbon, phosphor and kjeldahl nitrogen contents were stable. After 300 days the content of polluting trace elements, such as mercury, lead and cadmium, were similar to that of a conventional treatment plant supplied with this wastewater. Carbon and kjeldahl nitrogen removal was always quite satisfactory. Carbon was always removed for more than 90% and kjeldahl nitrogen that was not assimilated was completely nitrified at all times. The nitrification capacity at 30°C was constantly around 0.2 mmol·g MLSS−1·h−1, which shows that the viability of the nitrifying population did not cease. In addition, up to 40% of nitrogen supplied was lost as a result of denitrification. Hence stable treatment performance and a very low sludge production can be achieved when complete sludge retention is applied at high hydraulic loads.