附加气IC反应器的启动及对油墨废水和城市生活污水处理的研究
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摘要
本论文针对IC(Internal Circulation)反应器启动过程中污泥颗粒化困难、在处理低浓度和有毒废水时因产气量小而内循环无法正常进行的缺点,介绍了一种强制气体循环的试验性附加气IC反应器的设计与制作。比较了试验性附加气IC反应器与普通IC反应器的启动及运行过程,探讨了附加气IC反应器与普通IC反应器在启动时间、有机负荷、颗粒污泥特性等方面的优势,并对其机理进行了分析;研究了附加气IC反应器对油墨废水的处理能力和处理效率;对附加气IC反应器处理城市生活污水的可行性及其对温度的适应性和酸碱度变化的缓冲能力进行了试验性研究,在试验基础上总结了处理该两种废水的工艺流程。得出了如下主要研究结论:
     1.附加气IC反应器比普通IC反应器在启动时间上缩短20%,容积负荷提高25%,培养出的颗粒污泥在沉降性、污泥活性、机械强度等方面均有较大程度的提高。其主要原因是附加气IC反应器膨胀床区具有高的水力和气体上升流速,高的上升流速对颗粒污泥有良好的选择作用,同时也增强了废水与颗粒污泥之间的传质效率。
     2.油墨废水对厌氧颗粒污泥有明显的抑制作用,其抑制程度随油墨废水浓度的增加而增大;当油墨废水与葡萄糖基质之比小于1:4时,油墨废水对颗粒污泥的毒性属代谢毒性,其比例大于1:2时属于杀菌毒性。
     3.附加气IC反应器在以葡萄糖作共基质的前提下可处理色度为1500的油墨废水,其COD去除率为90.9%、色度的去除率为93%以上,但反应器最大容积负荷下降20%,厌氧颗粒污泥必须经历一个从低浓度到高浓度的驯化过程。
     4.附加气IC反应器处理城市生活污水时容积负荷为18 kgCOD/(m~3·d),COD去除率达80%以上,出水中悬浮性COD浓度较高,仅经沉淀、过滤等简单物理处理即可达标排放。
     5.温度对附加气IC反应器处理城市生活污水影响较小,酸碱度的变化对其影响较大,酸度变化对其影响程度大于碱度的变化。
Focusing on the defects of Internal Circulation Reactor of slow process of sludge granulated during the period of start-up and abnormal operation of internal circulation for low gas yield when it was used to treat toxic and low concentration of organic wastcwater , an experimental facility of Additional Gas Internal Circulation Reactor has been designed and made. By detecting the parameters such as start-up period, organic loading rale and characteristic of granular sludge, the advantages of Additional Gas IC Reactor were explored in detail. The functional mechanism of Additional Gas IC Reactor was also analyzed. The capacity, efficiency, availability and amortizing ability of change on temperature, acidity and alkalinity to treat printing ink wastewater and municipal wastewater with Additional Gas IC Reactor were studied. The wastewater treatment process flows of two kinds of wastewater were also summarized basing on the result of experiment. The main conclusions are as follows:
    1.Compared to the traditional IC Reactor, the start-up period of Additional Gas IC Reactor could be shorten by 20% and organic loading rate could be enhanced by 25%. In additional, it improved the sedimentation rate, activity and mechanical intensity of granular sludge. The major reason was probably the excellent selection action to granular sludge for rapid velocity of up-rise water and gas flow in expanding bed of Additional Gas IC Reactor. It also increased the process of mass transfer between wastewater and granular sludge.
    2.The printing ink waslewaler could restrain activity of anaerobic granular sludge. The restraining level increase with concentration of wastewater. When ratio of printing ink wastewater and substrate of glucose is less than 1:4, the toxicity for anaerobic granular sludge owed to metabolic toxic one. When the ratio is more than 1: 2, it owed to germicidal toxic one.
    3.Under using glucose as substrate condition, the Additional Gas IC Reactor could treat printing ink wastewater which the chromaticity is 1500 with 90.9% removed rate on chromaticity and 93% removed rate on COD. On the contrary, the maximal volume loading rate was reduced by 20% and the anaerobic granular sludge must experience a domestication period which the concentration of waslewatcr increased from low to high.
    4.The volume loading rate of Additional Gas IC Reactor for municipal waslewaler is 18 kg COD/(m3. d) with the removing rale of COD above 80%.. Because of high concentralion of suspended COD, effluent could be discharged after operating of primary trcalmenl such as sedimentation, filtration etc.
    
    
    
    5. Unlike the change of temperature, the change of acidity and alkalinity affected seriously the operating capacity of Additional Gas IC Reactor for municipal wastewater. The change of acidity affected the operating capacity of Additional Gas IC Reactor was more serious than that of alkalinity.
    Author: Wu Genyi (Environmental Science and Engineering) Directed by: Professor Yang Renbin
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