naa a22 4500 51075211X CHVBK 20180411092755.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11270-013-1543-z doi (NATIONALLICENCE)springer-10.1007/s11270-013-1543-z Bioclogging in Porous Media Under Discontinuous Flow Condition [Elektronische Daten] [Xiaoqing Zhong, Yanqing Wu, Zengguang Xu] Bioclogging extensively exists in porous media, such as permeable reactive barrier (PRB), constructed wetland, reverse osmosis, and biofilter systems and affects efficiency of sewage treatment. In this paper, variation in biochemical and hydraulic parameters under discontinuous flow condition during the clogging process was obtained. Hydraulic conductivity (K) first decreased sharply to 34.22% of the original value during the initial 12th day and, finally, decreased to 13.70%. Hydrodynamic dispersion (D) went through slow increase, fast increase, fast decrease, slow increase, and ultimately decreased to 44.25%. Porosity (n) decreased obviously, especially during the initial 12days, and total bacterial counts in the inlet of the column had more than one order of magnitude increase. The bioclogging process can be divided into four stages: (1) severe bioclogging occurred and aerobic microorganisms reproduced rapidly in the inlet, (2) bioclogging existed in the entire sand column and the hydrodynamic dispersion increased drastically as anaerobic microorganisms generated some gas, (3) aerobic and anaerobic microorganisms reproduced and hydrodynamic dispersion decreased rapidly, and (4) microorganisms multiplied continuously and the hydraulic parameters (hydrodynamic dispersion, hydraulic conductivity, and porosity) decreased steadily. Bioclogging then transformed into steady stage. Based on analysis of experimental data, hydraulic conductivity (K) follows the rule of negative exponent relationship, porosity (n) accords with power exponent relationship, and hydrodynamic dispersion (D) is polynomial equation under bioclogging process. Springer Science+Business Media Dordrecht, 2013 Bioclogging nationallicence Porous media nationallicence Hydraulic conductivity nationallicence Hydrodynamic dispersion nationallicence Porosity nationallicence Zhong Xiaoqing School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240, Shanghai, China aut Wu Yanqing School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240, Shanghai, China aut Xu Zengguang School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240, Shanghai, China aut Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-12 0049-6979 224:5<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1543-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1543-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhong Xiaoqing School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240, Shanghai, China aut NATIONALLICENCE 700 1- Wu Yanqing School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240, Shanghai, China aut NATIONALLICENCE 700 1- Xu Zengguang School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240, Shanghai, China aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-12 0049-6979 224:5<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 51075211X BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer