Galí A, Dosta J, Macé S, Mata-Alvarez J
Department of Chemical Engineering, University of Barcelona, Martí i Franquès, 1, 6th floor, 08028 Barcelona, Spain.
Environ Technol. 2006 Aug;27(8):891-9. doi: 10.1080/09593332708618699.
Treating the supernatant (reject water) from an anaerobic sludge digestion (800-1200 mg NH4(+)-N l(-1)) may be a good solution for meeting local requirements. As reject water represents 0.6% of the total wastewater influent flow and contains 10-30% of the total N it is recirculated to the head plant. In this study, a lab-scale start-up of biological nitrification/denitrification process to treat reject water was developed in a sequencing batch reactor. Sludge acclimation to the denitrification process was quite fast (6-7 days) for both NO2(-)-N and NO3(-)-N, whereas in nitrification it was slower (20 days). The use of a sequencing batch reactor to treat reject water produced a complete biological reduction of the NH4(+)-N via nitrite, working with sludge age of 15 days, hydraulic retention time of 1.3 days, temperature of 28 degrees C, pH between 7-8.5 and biomass concentration around 3500 mg VSS l(-1). Specific efficiencies were 14 mg NH4(+)-N (g VSS h(-1)) and 30 mg NO2(-)-N (g VSS h)(-1).
处理厌氧污泥消化产生的上清液（排水）（800 - 1200毫克铵态氮/升）可能是满足当地需求的一个好办法。由于排水占总进水流量的0.6%，且含有总氮的10 - 30%，所以将其再循环至污水处理厂前端。在本研究中，在序批式反应器中开展了处理排水的生物硝化/反硝化过程的实验室规模启动。对于亚硝酸盐氮和硝酸盐氮，污泥适应反硝化过程相当快（6 - 7天），而在硝化过程中则较慢（20天）。使用序批式反应器处理排水，在污泥龄为15天、水力停留时间为1.3天、温度为28摄氏度、pH值在7 - 8.5之间且生物量浓度约为3500毫克挥发性悬浮固体/升的条件下，实现了通过亚硝酸盐对铵态氮的完全生物还原。特定效率为14毫克铵态氮/（克挥发性悬浮固体·小时）和30毫克亚硝酸盐氮/（克挥发性悬浮固体·小时）。
