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两相厌氧-MBR处理化学制药废水实验及数学模型
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摘要
化学合成类制药废水属于高浓度难降解有机废水,采用常规的生物处理方法难以达标排放。通过分析化学合成类制药废水水质特点,采用两相厌氧-膜生物反应器这一工艺流程处理该种废水。
     采用两相厌氧-膜生物反应器处理化学合成类制药废水,实验结果表明:两相厌氧-膜生物反应器处理该种制药废水在技术上是可行的,能够长期稳定运行。产酸相启动42天后平均COD去除率为32.4~51.6%,容积负荷可达到30.1~41.6kgCOD/(m~3·d)。液相末端发酵产物中以乙酸、丁酸、乙醇为主,丙酸、戊酸含量较少,呈混合酸发酵类型,挥发酸含量从3.7%提高到23.1%。产甲烷相启动20天后COD平均去除率为86.7%,平均容积负荷为4.5kgCOD/(m~3·d)。MBR出水COD小于80mg/L,可达到排放标准,日平均容积负荷在5.0~6.2kgCOD/(m~3·d)之间。MBR中污泥浓度高于传统活性污泥法,而且当污泥浓度大于7637mg/L时,COD去除率大于97.0%。
     以国际水质污染与控制协会IAWQ推出的活性污泥数学模型(ASM1)和厌氧活性污泥数学模型(ADM1)为基础,建立了两相厌氧-膜生物反应器处理化学制药废水的数学模型,并对试验过程进行了模拟。模拟结果表明该模型可以模拟两相厌氧-膜生物反应器的运行情况。ADM1模型可以直接用于CSTR反应器的模拟,而UASB内部的流体流态比较复杂,经研究发现轴向离散模型和全混串联模型能够较好的反映UASB反应器内部的流体流动状态。ASM1能够有效的模拟膜生物反应器的运行情况,可以对膜生物反应器影响因素进行评价,优化膜生物反应器的运行和管理。
The chemical synthetic pharmacy wastewater is a kind of high concentration organic wastewater, which pollutants was difficult to degrade. Using conventional the biological treatment method is difficult to reach the wastewater discharge standard.By analyzing the characteristics of chemical synthetic pharmacy wastewater, we put forward a scheme to treat the produced wastewater, through the technological process of two phase anaerobic-membrane bioreactor.
     Using two phase anaerobic-membrane bioreactor treating chemical synthetic pharmacy wastewater, the result shows that two anaerobic-membrane bioreactor treat this kind of drugs manufacture wastewater is feasible. Acidogenic-phase start-up in 42d. average removal rates of COD is 32.4~51.6%, while the volume loading rate in CSTR is ranging from 30.1 to 41.6 kgCOD/(m~3·d), most of the fermented products in the end of this process are acetic acid, butyric acid and ethanol, propionic acid and valeric acid content are few, it is mixed acids-type fermentation. The average content of effluent volatile fatty acids (VFA) of acidogenic-phase is 23.1%, and the biodegradability of the wastewater has been improved greatly. Methanogenic-phase start-up in 20d, average removal rates of COD is 86.7%, the volume loading rate is 4.5 kgCOD/(m~3·d). The effluent COD of MBR is less than 80 mg/L. the volume loading rate is ranging from 5.0 to 6.2kgCOD/(m~3·d). In MBR the sludge density is higher than the traditional active sludge reactor, the sludge density is higher than 7637mg/L, COD removal rate is higher than 97.0%.
     Based on ADM1 and ASM1, established a mathematical model of two phase anaerobic-membrane bioreactor treating chemical synthetic pharmacy wastewater. The model was able to reflect the trends that were observed in the experimental data, basely. ADM 1 used a hypothesis of ideal mixing. For acidogenic-phase, the reactor continuous stirred tank reactor was considered to be completely mixed. for methanogenic-phase,which internal fluid state is complex, so using the axial direction discrete model and mixed series connection model to simulate the flow model.ASM1 is able to reflect the trends of membrane bioreactor operation, and may carry on the appraisal to the membrane bioreactor influencing factor, can optimize the operation and the management of membrane bioreactor.
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