MBBR工艺中悬浮填料的参数控制及优化组合研究

发布时间：2018-08-24 12:01

【摘要】：移动床生物膜反应器(Moving bed biofilm reactor,MBBR)是在生物滤池和流化床的工艺基础上发展起来的一种水处理新技术。它有效吸取了传统活性污泥法及传统生物膜法的优点,是一种新型高效的复合污水处理工艺。MBBR对污水处理效果的优劣,关键是看悬浮填料表面生物膜的数量与活性。本研究采用MBBR工艺对西南科技大学生活污水(COD_(cr):228~806mg/L,NH_4~+-N:21.49~59.63 mg/L,TN:38.81~77.54 mg/L,p H:6.01~7.84)进行处理,通过系统调节挂膜启动条件、优化悬浮填料的填充率、筛选悬浮填料并进行组合的方式增强反应池内微生物的总含量,提高污水处理效果。主要得出以下研究结论:曝气量和水力停留时间(HRT)是影响挂膜启动的重要因素。随着曝气量的增加和HRT的延长,MBBR对COD_(cr)、NH_4~+-N的去除率都是先增加后减小。当曝气量为5 L/min时污染物去除率最高,挂膜完成后COD_(cr)、NH_4~+-N的去除率分别可达91.1%和95.17%。当HRT为8 h和10 h时,挂膜时污染物的去除效果相近,且高于HRT为6 h和12 h。综合实际因素确定HRT最佳值为8 h,此条件下COD_(cr)、NH_4~+-N的去除率分别可达89.27%和92.18%。填充率对MBBR污水处理效果有着显著的影响。随着填充率的增加,聚乙烯填料和聚氨酯填料对污染物的去除效果都是显著提升后有所下降,综合考虑确定悬浮填料最佳填充率为30%。此时聚乙烯填料对COD_(cr)、NH_4~+-N及TN去除率分别可达94.12%,97.45%,72.15%,出水浓度分别为38 mg/L,1.32 mg/L,17.51 mg/L;聚氨酯填料对COD_(cr)、NH_4~+-N及TN去除率分别可达93.81%,97.41%,70.98%,出水浓度分别为40 mg/L,1.34 mg/L,18.25 mg/L。不同悬浮填料对MBBR污水处理的效果不同。APG悬浮填料对COD_(cr)、NH_4~+-N、TN的去除效果最好,其次为聚乙烯白,聚乙烯黑,最后为聚氨酯悬浮填料。挂膜过程中,APG悬浮填料对污染物的去除效果始终高于其他3种悬浮填料;聚氨酯悬浮填料在挂膜初期对污染物的去除效果高于2种聚乙烯填料,但最终去除效果比2种聚乙烯填料低。悬浮填料的组合投加可以有效提升MBBR的污水处理效果。APG+聚乙烯白悬浮填料组合投加时对COD_(cr)的最终去除率比APG悬浮填料和聚乙烯白悬浮填料单独投加时对COD_(cr)的去除率分别高6.41%和14.6%,对NH_4~+-N的最终去除率比APG悬浮填料和聚乙烯白悬浮填料单独投加时对NH_4~+-N的去除率分别高8.49%和17.19%,对TN的最终去除率比APG悬浮填料和聚乙烯白悬浮填料单独投加时对TN的去除率分别高4.4%和10.37%。APG+聚乙烯白悬浮填料以1:1的比例组合投加后,在第21天时挂膜量就达到了5.37 mg/g,超过了同期APG(4.16 mg/g)和聚乙烯填料(2.78 mg/g)单独投加时的挂膜量。从第21天到27天,APG+聚乙烯白组合填料生物膜量仅提高了4.47%,而聚乙烯白和APG填料挂膜量分别提升了26.26%和17.31%。可以认为第21天组合填料已经基本完成了挂膜。因此,悬浮填料的组合投加可以缩短挂膜时间。
[Abstract]:Moving bed biofilm reactor (Moving bed biofilm reactor,MBBR) is a new water treatment technology developed on the basis of biofilter and fluidized bed. It effectively absorbs the advantages of the traditional activated sludge process and the traditional biofilm process. It is a new and efficient composite wastewater treatment process. The key is to determine the quantity and activity of the biofilm on the surface of suspended filler. In this study, the MBBR process was used to treat the domestic sewage of Southwest University of Science and Technology (COD_ (cr): 2286mg / L). The filling rate of suspended fillers was optimized by adjusting the start-up conditions of the suspensions. The total microbial content in the reactor was enhanced by screening and combining the suspended fillers, and the sewage treatment effect was improved. The main conclusions are as follows: aeration rate and HRT (HRT) are the important factors affecting the start-up of the film. With the increase of aeration rate and the prolongation of HRT, the removal rate of NH4 ~ -N of COD_ (cr) increased first and then decreased. When the aeration rate is 5 L/min, the removal rate of pollutants is the highest, and the removal rate of NH4- N of COD_ (cr) can reach 91.1% and 95.17%, respectively. When HRT was 8 h and 10 h, the removal efficiency of pollutants was similar and higher than that of HRT at 6 h and 12 h. The optimum value of HRT is 8 h, and the removal rate of NH4 ~ -N of COD_ (cr) can reach 89.27% and 92.18% respectively. Filling rate has a significant effect on MBBR wastewater treatment. With the increase of filling ratio, the removal effect of polyethylene and polyurethane fillers on pollutants decreased after significant improvement, and the optimum filling ratio of suspension filler was determined to be 30%. At this time, the removal rates of COD_ (cr) NH4- N and TN by polyethylene filler can reach 94.12 ~ -97.45 and 97.45% respectively. The effluent concentration is 38 mg/L,1.32 mg/L,17.51 mg/L; polyurethane filler to remove COD_ (cr) NH4- N and TN respectively up to 93.81%, 97.41% and 70.98%, respectively. The effluent concentration is 40 mg/L,1.34 mg/L,18.25 mg/L., respectively. The effects of different suspensions on MBBR wastewater treatment were different. APG suspensions had the best removal effect on COD_ (cr) NH4- NTN, followed by polyethylene white, polyethylene black and polyurethane suspensions. The pollutant removal efficiency of APG suspensions was always higher than that of the other three suspensions, and that of polyurethane suspensions was higher than that of two kinds of polyethylene fillers. However, the final removal efficiency was lower than that of two polyethylene fillers. The final removal rate of COD_ (cr) is higher than that of APG suspensions and polyethylene white suspensions compared with that of APG suspensions and polyethylene white suspensions alone. The final removal rate of NH_4~ -N was 8.49% and 17.19% higher than that of APG suspending filler and polyethylene white suspending filler, respectively. The final removal rate of TN was higher than that of APG suspending filler and polyethylene white suspension filler. The removal rate of TN was increased by 4.4% when the filler was added alone, and the 10.37%.APG polyethylene white suspension filler was added in the proportion of 1:1. On the 21st day, the amount of film hanging reached 5.37 mg/g, which was higher than that of APG (4.16 mg/g) and polyethylene filler (2.78 mg/g). From day 21 to day 27, the biofilm amount of polyethylene white filler increased only by 4.47%, while that of polyethylene white filler and APG filler increased by 26.26% and 17.31%, respectively. It can be considered that on the 21 st day the composite packing has basically completed the hanging film. Therefore, the combination of suspending fillers can shorten the time of film suspension.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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