Chen Zhaobo, Ren Nanqi, Wang Aijie, Zhang Zhen-Peng, Shi Yue
Research Center of Environmental Biotechnology, 2614#, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 202 Haihe Road, Harbin, PR China.
Water Res. 2008 Jul;42(13):3385-92. doi: 10.1016/j.watres.2008.04.020. Epub 2008 May 3.
A pilot-scale test was conducted with a two-phase anaerobic digestion (TPAD) system and a subsequential membrane bioreactor (MBR) treating chemical synthesis-based pharmaceutical wastewater. The TPAD system comprised a continuous stirred tank reactor (CSTR) and an upflow anaerobic sludge blanket-anaerobic filter (UASBAF), working as the acidogenic and methanogenic phases, respectively. The wastewater was high in COD, varying daily between 5789 and 58,792 mg L(-1), with a wide range of pH from 4.3 to 7.2. The wastewater was pumped at a fixed flow rate of 1m(3)h(-1) through the CSTR, the UASBAF and the MBR in series, resulting in respective HRTs of 12, 55 and 5h. Almost all the COD was removed by the TPAD-MBR system, leaving a COD of around 40 mg L(-1) in the MBR effluent. The pH of the MBR effluent was found in a narrow range of 6.8-7.6, indicating that the MBR effluent can be directly discharged into natural waters. A model, built on the back propagation neural network (BPNN) theory and linear regression techniques, was developed for the simulation of TPAD-MBR system performance in the biodegradation of chemical synthesis-based pharmaceutical wastewater. The model well fitted the laboratory data, and was able to simulate the removal of COD.
采用两相厌氧消化（TPAD）系统和后续膜生物反应器（MBR）对基于化学合成的制药废水进行了中试规模试验。TPAD系统包括一个连续搅拌釜式反应器（CSTR）和一个上流式厌氧污泥床-厌氧滤池（UASBAF），分别作为产酸相和产甲烷相。废水的化学需氧量（COD）很高，每天在5789至58792mg/L之间变化，pH值范围很广，从4.3到7.2。废水以1m³/h的固定流速串联泵入CSTR、UASBAF和MBR，各自的水力停留时间分别为12、55和5小时。TPAD-MBR系统几乎去除了所有的COD，MBR出水的COD约为40mg/L。发现MBR出水的pH值在6.8 - 7.6的狭窄范围内，这表明MBR出水可直接排放到天然水体中。基于反向传播神经网络（BPNN）理论和线性回归技术建立了一个模型，用于模拟TPAD-MBR系统对基于化学合成的制药废水生物降解的性能。该模型与实验室数据拟合良好，能够模拟COD的去除情况。
