改进型IC厌氧反应器处理印染废水的特性研究
发布时间：2018-08-19 14:35
【摘要】：内循环式厌氧反应器(Internal circulation anaerobic reactor,IC)是荷兰PAQUES公司于80年代中期在UASB反应器的基础上研发的第三代高效厌氧反应器。IC反应器处理生化性差的高浓度工业废水时,反应初期产气量少,不足以形成高效的液压混合,使得污泥停留在反应器底部,影响了废水与污泥之间的传质,从而限制了该反应器的应用范围。纺织业是我国重要的传统工业,每年排放大量的印染废水,因此,开展印染废水的处理研究具有重要的意义。为了克服IC反应器在工程应用中的局限性,本文采用改进型的IC厌氧反应器处理印染废水。不同于一般的IC反应器,改进型IC厌氧反应器在第一反应室与进口混合区设置循环管,强化了污泥与污染物基质之间的混合和传质,提高了反应器的处理效果。主要研究结果如下:(1)本试验利用颗粒污泥作为接种污泥,在外循环流量为420L/h下,逐步提高印染废水比例来驯化颗粒污泥,经过48天完成启动阶段。随着印染废水比例的增加,COD去除率从93.8%降至85%,出水VFA浓度呈现上升趋势。通过提高进水流量和进水浓度来逐步地提高容积负荷,使其从4.8 kg COD/(m3·d)提高到9.6 kg COD/(m3·d),COD去除率达到75%,其中最高为87.2%,产气量从1.5 L/(L·d)增加到2.92 L/(L·d)。反应器在稳定运行后,容积负荷为8.4kg COD/(m3·d)时,COD去除率达到85%,出水中VFA稳定在200 mg/L以下。(2)改进型IC厌氧反应器最佳的外循环流量为420 L/h(上升流速为23.9 m/h),在该流速下COD去除率达到85%。过低的上升流速(0.1 m/h)会引起泥水的混合不均和反应器内存在死角区,降低COD去除效率,而过大的上升流速(40.9 m/h)会加强污泥间碰撞,造成污泥破碎。(3)对接种污泥和稳定运行后的颗粒污泥进行特性研究,发现随着反应器的运行,颗粒粒径分布发生变化,粒径2mm的颗粒污泥占总质量比例从77.9%增加到85.5%。颗粒污泥表面存在许多不同形状的空隙和洞穴。接种前后的颗粒污泥中都存在大量的产甲烷菌,主要是甲烷杆菌、甲烷鬓毛菌、甲烷绳菌。(4)对改进型IC厌氧反应器在上升流速分别为23.9 m/h和0.1m/h两种情况下的动力学特性进行研究,发现Grau second-order和Modified Stover-Kincannon动力学模型都适用,R20.98,其线性相关性高。
[Abstract]:The internal circulation anaerobic reactor (Internal circulation anaerobic) is the third generation of high efficiency anaerobic reactor based on the UASB reactor developed by Netherlands PAQUES Company in the mid-1980s. When the reactor is used to treat high concentration industrial wastewater with poor biodegradability, the initial gas production of the reactor is less. It is not enough to form efficient hydraulic mixing, which makes the sludge stay at the bottom of the reactor, which affects the mass transfer between wastewater and sludge, thus limiting the application of the reactor. Textile industry is one of the most important traditional industries in our country, and a large amount of printing and dyeing wastewater is discharged every year. Therefore, it is of great significance to study the treatment of printing and dyeing wastewater. In order to overcome the limitation of IC reactor in engineering application, an improved IC anaerobic reactor was used to treat dyeing wastewater. Different from the conventional IC reactor, the improved IC anaerobic reactor is equipped with circulating tubes in the first reactor and the inlet mixing zone, which enhances the mixing and mass transfer between sludge and pollutant matrix, and improves the treatment efficiency of the reactor. The main results are as follows: (1) in this experiment, granular sludge was used as inoculation sludge, and the proportion of printing and dyeing wastewater was gradually increased to acclimate the granular sludge under the external circulation flow rate of 420L/h. After 48 days, the start-up stage was completed. With the increase of the proportion of printing and dyeing wastewater, the removal rate of VFA decreased from 93.8% to 85wt%, and the effluent VFA concentration showed an increasing trend. By increasing the influent flow rate and influent concentration, the volumetric load was gradually increased from 4.8 kg COD/ (m 3 d) to 9.6 kg COD/ (m 3 d). The removal rate of COD was 75%, of which the highest was 87.2%, and the gas production increased from 1.5 L / (L d) to 2.92 L / (L d). After stable operation, the COD removal rate of the reactor is 85mg / h when the volumetric loading is 8.4kg COD/ (m3 / d), and the VFA in the effluent is below 200 mg/L. (2) the optimal external circulation flow rate of the improved IC anaerobic reactor is 420L / h (the rising velocity is 23.9 m/ h), and the removal rate of COD reaches 85g / h at this flow rate. Too low up flow rate (0.1 m / h) will lead to uneven mixing of mud water and dead corner zone in reactor, which will reduce COD removal efficiency, while too high rising velocity (40.9 m / h) will enhance sludge collision. (3) the characteristics of the inoculated sludge and the granular sludge after stable operation were studied. It was found that the particle size distribution changed with the operation of the reactor, and the proportion of granular sludge with the particle size of 2mm increased from 77.9% to 85.5%. There are many different forms of voids and caverns on the granular sludge surface. There are a lot of methanogenic bacteria in granular sludge before and after inoculation, mainly methanobacterium, methanophora. (4) the kinetic characteristics of the improved IC anaerobic reactor were studied under the condition of rising velocity of 23.9 m / h and 0.1m/h, respectively. It was found that the kinetic models of Grau second-order and Modified Stover-Kincannon were both suitable for R20.98, and the linear correlation was high.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X791
[Abstract]:The internal circulation anaerobic reactor (Internal circulation anaerobic) is the third generation of high efficiency anaerobic reactor based on the UASB reactor developed by Netherlands PAQUES Company in the mid-1980s. When the reactor is used to treat high concentration industrial wastewater with poor biodegradability, the initial gas production of the reactor is less. It is not enough to form efficient hydraulic mixing, which makes the sludge stay at the bottom of the reactor, which affects the mass transfer between wastewater and sludge, thus limiting the application of the reactor. Textile industry is one of the most important traditional industries in our country, and a large amount of printing and dyeing wastewater is discharged every year. Therefore, it is of great significance to study the treatment of printing and dyeing wastewater. In order to overcome the limitation of IC reactor in engineering application, an improved IC anaerobic reactor was used to treat dyeing wastewater. Different from the conventional IC reactor, the improved IC anaerobic reactor is equipped with circulating tubes in the first reactor and the inlet mixing zone, which enhances the mixing and mass transfer between sludge and pollutant matrix, and improves the treatment efficiency of the reactor. The main results are as follows: (1) in this experiment, granular sludge was used as inoculation sludge, and the proportion of printing and dyeing wastewater was gradually increased to acclimate the granular sludge under the external circulation flow rate of 420L/h. After 48 days, the start-up stage was completed. With the increase of the proportion of printing and dyeing wastewater, the removal rate of VFA decreased from 93.8% to 85wt%, and the effluent VFA concentration showed an increasing trend. By increasing the influent flow rate and influent concentration, the volumetric load was gradually increased from 4.8 kg COD/ (m 3 d) to 9.6 kg COD/ (m 3 d). The removal rate of COD was 75%, of which the highest was 87.2%, and the gas production increased from 1.5 L / (L d) to 2.92 L / (L d). After stable operation, the COD removal rate of the reactor is 85mg / h when the volumetric loading is 8.4kg COD/ (m3 / d), and the VFA in the effluent is below 200 mg/L. (2) the optimal external circulation flow rate of the improved IC anaerobic reactor is 420L / h (the rising velocity is 23.9 m/ h), and the removal rate of COD reaches 85g / h at this flow rate. Too low up flow rate (0.1 m / h) will lead to uneven mixing of mud water and dead corner zone in reactor, which will reduce COD removal efficiency, while too high rising velocity (40.9 m / h) will enhance sludge collision. (3) the characteristics of the inoculated sludge and the granular sludge after stable operation were studied. It was found that the particle size distribution changed with the operation of the reactor, and the proportion of granular sludge with the particle size of 2mm increased from 77.9% to 85.5%. There are many different forms of voids and caverns on the granular sludge surface. There are a lot of methanogenic bacteria in granular sludge before and after inoculation, mainly methanobacterium, methanophora. (4) the kinetic characteristics of the improved IC anaerobic reactor were studied under the condition of rising velocity of 23.9 m / h and 0.1m/h, respectively. It was found that the kinetic models of Grau second-order and Modified Stover-Kincannon were both suitable for R20.98, and the linear correlation was high.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X791
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