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水解酸化对好氧颗粒污泥脱氮除磷的影响
苑泉
作者单位E-mail
苑泉 清华大学 yuanquan1990@Hotmail.com 
摘要:
通过引入水解酸化相,研究了不同基质对好氧颗粒污泥脱氮除磷的影响。结果表明,当进水基质为葡萄糖时,水解酸化(R1)+SBR(R2)的两段式和SBR(R3)一段式都能够成功培养出颗粒致密、沉降性能好的好氧颗粒污泥。接种活性污泥后的第13 d R2反应器中形成粒径大小为1.0~1.6 mm的颗粒污泥,而R3反应器仍以絮状污泥为主,颗粒污泥成熟后,R2的粒径增长至1.0~2.0 mm间,R3的粒径主要分布在1.0~1.6 mm 间。葡萄糖经水解酸化后主要产物是乙酸。两种颗粒污泥对COD和NH3-N均有很好的去除效果,去除率均接近100%。R2的TN和TP的去除率分别为88.5% 和72.8%,明显高于R3(TN和TP去除率分别为67.2% 和60.1%),出水TN最低可达3 mg/L,TP可达1.0 mg/L。利用高通量测序对水解酸化污泥(R1)、和R2、R3运行初期和运行后期的颗粒污泥的微生物群落结构进行解析,发现Proteobacteria 和Bacteroidetes 始终是主要菌种,随着好氧颗粒污泥的成熟,R2和R3的shannon指数均显著增加,成熟的R2的颗粒污泥的shannon指数最高,表现出良好的生物多样性和系统稳定性。总的来说,水解酸化为好氧颗粒污泥的形成提供了关键基质,促进了好氧污泥颗粒化,培养出的好氧颗粒污泥运行稳定,脱氮除磷效果好,微生物种群丰富。
关键词:  水解酸化,好氧颗粒污泥,关键基质,脱氮除磷
DOI:
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Effects of hydrolytic acidification on the nitrogen and phosphorus removal of aerobic granular sludge
YuanQuan
Abstract:
Effects of different substrates on the nitrogen and phosphorus removal of aerobic granular sludge (AGS) were studied after introducing hydrolytic acidification phase. The results showed that both two-stage (hydrolytic acidification (R1) + SBR (R2)) and one-stage (R3) methods could cultivate AGS with dense structure and good settling performance. The 13th day after inoculating activated sludge, 1.1 ~1.6 mm size particles were formed in R2, while flocculent sludge was the dominant in R3. After the AGS matured, the particles in R2 and R3 were mainly distributed between 1.0~2.0 mm and 1.0~1.6 mm, respectively. Acetate was the main product after glucose hydrolytic acidification. Both kinds of AGS showed excellent removal performance on COD and NH3-N with almost 100% removal rate. TN and TP removal rate in R2 were 88.5% and 72.8%, which were much higher than that of R3 with 67.2% for TN and 60.1% for TP removal. The minimum effluent in R2 were 3.0 mg/L for TN and 1.0 mg/L. High-throughput sequencing was applied to analyze the microbial community structure in R2 and R3 in the early stage and mature stage. The result showed that Proteobacteria and Bacteroidetes were always the main bacteria. With the maturing of AGS, Shannon index increased greatly, and the mature AGS in R2 showed the highest biodiversity and stability. In general, hydrolytic acidification phase provided the key substrate for the formation of AGS, and stimulated the granulation of activated sludge, the AGS cultivated by coupling hydrolytic acidification showed stable performance with good nitrogen and phosphorus removal rate and abundant microbial community.
Key words:  hydrolytic acidification, aerobic granular sludge, key substrate, nitrogen and phosphorus removal