论文部分内容阅读
湖北西北部某工业园已建成污水处理厂(反应沉淀/水解酸化/MBR工艺)以处理合成制药废水为主,由于其预处理段处理效果难以满足后续MBR工艺要求,导致出水水质不能达到国家相关标准,急需升级改造。针对该合成制药废水污染物成分复杂、污染当量大、冲击负荷高、可生物降解性差以及水量水质变化大等特点,采用铁碳微电解/水解酸化两级预处理工艺对该制药废水进行强化预处理,并建立两级预处理/MBR工艺进行小试实验,实验结果表明,铁碳投加量为400g·L~(-1),铁碳质量比为4∶5,HRT=3 h,pH=4,曝气量为3 L·min-1时,一级预处理效果较好,铁碳微电解对COD去除率达47.50%,废水可生化性由0.23提升到0.38;二级预处理水解酸化将废水可生化性由0.38提升至0.46,促使MBR工艺运行效果大幅提升,最终出水达到《化学合成类制药工业水污染排放标准》(GB 21904-2008)。
A wastewater treatment plant (reaction precipitation / hydrolytic acidification / MBR process) has been built in an industrial park in the northwestern part of Hubei Province for the treatment of synthetic pharmaceutical wastewater. Because of its pretreatment section treatment effect is difficult to meet the requirements of subsequent MBR process, the effluent quality can not reach the national level Standard, urgent need to upgrade. In view of the complex composition of contaminants, large pollution equivalent, high impact load, poor biodegradability and large changes of water quality and so on, the pharmaceutical wastewater was intensively pretreated with iron carbon micro-electrolysis / hydrolysis acidification The experimental results showed that the optimum conditions were as follows: iron and carbon dosage 400g · L -1, iron-carbon mass ratio 4: 5, HRT = 3 h, pH = 4, the aeration rate is 3 L · min-1, the first-order pretreatment is better, the COD removal efficiency of iron-carbon micro-electrolysis reaches 47.50%, the biodegradability of wastewater increases from 0.23 to 0.38; Acidification increased the biodegradability of wastewater from 0.38 to 0.46, which promoted the operation effect of MBR technology to increase substantially. The effluent finally reached the “Emission Standard of Water Pollution of Chemical Synthesis Pharmaceutical Industry” (GB 21904-2008).