Istanbul Technical University, Civil Engineering Faculty, Environmental Engineering Department, Maslak, 34469, Istanbul, Turkey; Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Watermanagement, Sanitary Engineering Section, Stevinweg 1, 2628, CN Delft, The Netherlands.
Universidade Nova de Lisboa, Faculdade de Ciências e Tecnologia, Departamento de Química, Lisbon, Portugal.
Water Res. 2018 Jun 15;137:164-172. doi: 10.1016/j.watres.2018.03.015. Epub 2018 Mar 7.
The impact of nitrogen on biological performance and sludge filterability of anaerobic membrane bioreactors was investigated in two lab-scale cross-flow anaerobic membrane bioreactors that were fed with cheese whey at two different COD:TKN ratios (50 and 190). Nitrogen deprivation adversely affected the biological treatment performance and reactor stability, as indicated by volatile fatty acids accumulation. On the other hand, nitrogen (urea) supplementation resulted in a reduced sludge median particle size and decreased sludge filterability. Standard filterability parameters such as capillary suction time and specific resistance to filtration tended to rapidly increase in the nitrogen supplemented reactor. The critical fluxes in the nitrogen limited and supplemented reactors were 20 and 9 L m h, respectively. The rapid deterioration of sludge filterability under nitrogen supplemented conditions was attributed to abundant growth of dispersed biomass. Thus, the COD:TKN ratio of wastewater affected both bioconversion and filterability performance in the anaerobic membrane bioreactors.
在两个采用切向流厌氧膜生物反应器的实验室规模实验中，考察了氮对厌氧膜生物反应器生物性能和污泥过滤性能的影响，这两个反应器分别以两种不同的 COD:TKN 比（50 和 190）进料奶酪乳清。氮的缺乏会对生物处理性能和反应器稳定性产生不利影响，这表现为挥发性脂肪酸的积累。另一方面，氮（尿素）的添加会导致污泥中值粒径减小，污泥过滤性能降低。在添加氮的反应器中，标准过滤性能参数如毛细抽吸时间和过滤比阻力往往会迅速增加。在氮受限和添加氮的反应器中的临界通量分别为 20 和 9 L m h。在添加氮的条件下，污泥过滤性能的迅速恶化归因于分散生物质的大量生长。因此，废水的 COD:TKN 比会影响厌氧膜生物反应器中的生物转化和过滤性能。
