铝盐在好氧污泥颗粒化过程中的强化作用及其分布特征
发布时间：2018-12-15 09:39
【摘要】：好氧颗粒污泥具有沉降性好、生物量较高且耐冲击负荷能力更强的优点,但较长的培养周期限制了它的发展。为了缩短颗粒污泥的形成时间,投加铝盐进行强化造粒。为考察铝盐在颗粒污泥形成过程中的作用,本文探讨了不同铝盐混凝剂的投加对颗粒污泥形态及基本特性的影响;解析铝元素在污泥成长过程中的含量变化和空间分布规律;分析造粒过程中EPS的含量及分布变化;并研究不同SBR反应器中颗粒污泥对污染物的处理效果。主要结果如下:(1)在SBR运行的第10-16 d,通过投加PAC和硫酸铝的方式培养好氧颗粒。投加PAC(R2)和硫酸铝(R3)均加速了污泥颗粒化的进程,与对照相比,投加铝盐的污泥颗粒化时间提前了10 d,且污泥的粒径增长较快。在反应器运行的32 d时,R1、R2和R3中颗粒污泥的MLSS分别为3.9 g/L、5.0 g/L、5.2 g/L;SVI分别为74 m L/g、78 m L/g、58 m L/g,投加硫酸铝污泥的物理性能优于PAC。(2)EPS分析结果表明:在颗粒污泥的成长期(8-25 d),和对照组相比较(R1),投加PAC(R2)和投加硫酸铝(R3)使得LB-EPS和TB-EPS含量均增加,且LB-EPS含量的增幅较大,进而加快了颗粒污泥的形成。而各类EPS中蛋白物质的含量均为先增加后降低再缓慢增加的过程。三维荧光图谱表明,在反应器的运行过程中,21 d污泥EPS中峰B、D和E的荧光强度大于50 d,投加铝盐对成熟的颗粒污泥EPS化学结构影响小,红外图谱表明,R1、R2和R3中污泥EPS的官能团均为蛋白质二级结构AmideⅢ和多糖类。(3)在16-29 d的阶段内,投加PAC的污泥中铝元素含量由30.46%降至0.43%。而投加硫酸铝的污泥中铝元素含量由45.69%降至13.29%。反应器运行至第42 d时,投加硫酸铝的污泥中铝元素含量为1.09%,明显高于经PAC强化的污泥(0.02%)。(4)投加不同类铝盐强化造粒的作用可能并不相同,PAC的投加通过絮凝作用粘结微生物,并强化EPS的分泌,EPS与细菌间的桥连作用聚集了微生物。硫酸铝的投加使生物聚集体内部形成了一个富含铝元素的核心,并促使EPS总量的增多,从而加快好氧污泥的颗粒化进程。(5)在颗粒污泥的成长阶段,对照组(R1)、投加PAC(R2)和投加硫酸铝(R3)污泥的细菌总数均呈现增加趋势,铝盐的投加对污泥中的细菌总数无明显影响。在30-41 d时,好氧颗粒中的细菌总数基本不变,R1、R2和R3好氧污泥的细菌总数分别为:6.7×109 cfu/g,1.03×1010 cfu/g和7×109 cfu/g。通过FISH技术分析18 d时好氧污泥中的微生物分布,发现R2污泥中微生物均匀分布,R3中微生物分布不均,且中心微生物较少。投加铝盐的好氧污泥均为类似圆形的外形,R1中好氧污泥的形态无规则。(6)投加PAC(R2)和硫酸铝(R3)的颗粒污泥COD平均去除率均为98%,而未投加混凝剂(R1)的污泥去除率为93%;R1、R2和R3中好氧颗粒污泥对氨氮的去除率分别为75%、81%和75%。
[Abstract]:Aerobic granular sludge has the advantages of good sedimentation, high biomass and stronger impact load resistance, but its development is limited by the long culture period. In order to shorten the forming time of granular sludge, aluminum salt was added to strengthen granulation. In order to investigate the role of aluminum salt in the formation of granular sludge, the effects of different aluminum salt coagulants on the morphology and basic characteristics of granular sludge were discussed, and the changes of aluminum content and spatial distribution in sludge growth were analyzed. The content and distribution of EPS in granulation process were analyzed, and the effects of granular sludge in different SBR reactors on the treatment of pollutants were studied. The main results are as follows: (1) aerobic particles were cultured by adding PAC and aluminum sulfate at 10-16 days of SBR. The process of sludge granulation was accelerated by adding PAC (R2) and aluminum sulfate (R3). Compared with the control, the granulation time of the sludge added with aluminum salt was 10 days earlier, and the particle size of sludge increased faster. The MLSS of granular sludge in R _ 1 ~ 2 ~ 2 and R _ 3 was 3.9 g / L ~ (5.0) g / L ~ (5. 2) g / L ~ (5.2) g / L, respectively, when the reactor was running for 32 days. The physical properties of the sludge added with aluminum sulfate were superior to those of PAC. (2) EPS analysis. The results showed that in the growth period of granular sludge (8-25 d),) compared with control group (R1), the physical properties of the sludge added with aluminum sulfate were better than those of the control group (R1). The addition of PAC (R2) and aluminum sulfate (R3) increased the contents of LB-EPS and TB-EPS, and the content of LB-EPS increased greatly, which accelerated the formation of granular sludge. The content of protein in all kinds of EPS increased first and then decreased and then increased slowly. Three-dimensional fluorescence spectra showed that the fluorescence intensities of peak B _ (D) and E in EPS were more than 50 days during the operation of the reactor. The effect of aluminum salt on the chemical structure of mature granular sludge (EPS) was small. The infrared spectra showed that, R _ (1), and B _ (D) and E were more than 50 days. The functional groups of sludge EPS in R2 and R3 were protein secondary structure Amide 鈪，
本文编号：2380426
[Abstract]:Aerobic granular sludge has the advantages of good sedimentation, high biomass and stronger impact load resistance, but its development is limited by the long culture period. In order to shorten the forming time of granular sludge, aluminum salt was added to strengthen granulation. In order to investigate the role of aluminum salt in the formation of granular sludge, the effects of different aluminum salt coagulants on the morphology and basic characteristics of granular sludge were discussed, and the changes of aluminum content and spatial distribution in sludge growth were analyzed. The content and distribution of EPS in granulation process were analyzed, and the effects of granular sludge in different SBR reactors on the treatment of pollutants were studied. The main results are as follows: (1) aerobic particles were cultured by adding PAC and aluminum sulfate at 10-16 days of SBR. The process of sludge granulation was accelerated by adding PAC (R2) and aluminum sulfate (R3). Compared with the control, the granulation time of the sludge added with aluminum salt was 10 days earlier, and the particle size of sludge increased faster. The MLSS of granular sludge in R _ 1 ~ 2 ~ 2 and R _ 3 was 3.9 g / L ~ (5.0) g / L ~ (5. 2) g / L ~ (5.2) g / L, respectively, when the reactor was running for 32 days. The physical properties of the sludge added with aluminum sulfate were superior to those of PAC. (2) EPS analysis. The results showed that in the growth period of granular sludge (8-25 d),) compared with control group (R1), the physical properties of the sludge added with aluminum sulfate were better than those of the control group (R1). The addition of PAC (R2) and aluminum sulfate (R3) increased the contents of LB-EPS and TB-EPS, and the content of LB-EPS increased greatly, which accelerated the formation of granular sludge. The content of protein in all kinds of EPS increased first and then decreased and then increased slowly. Three-dimensional fluorescence spectra showed that the fluorescence intensities of peak B _ (D) and E in EPS were more than 50 days during the operation of the reactor. The effect of aluminum salt on the chemical structure of mature granular sludge (EPS) was small. The infrared spectra showed that, R _ (1), and B _ (D) and E were more than 50 days. The functional groups of sludge EPS in R2 and R3 were protein secondary structure Amide 鈪，
本文编号：2380426
本文链接：https://www.wllwen.com/shengtaihuanjingbaohulunwen/2380426.html
