有机负荷波动频次对好氧颗粒污泥的影响

doi:10.16085/j.issn.1000-6613.2022-0226

摘要/Abstract

摘要：

为了探究在低强度进水条件下有机负荷波动频次对好氧颗粒污泥（aerobic granular sludge，AGS）的影响，设置3个序列间歇式反应器（sequence batch reactor，SBR）R1、R2和R3，以合成配水为基质，高低有机负荷率（organic load rate，OLR）分别为0.67g/(L∙d)、0.67g/(L∙d)，0.74g/(L∙d)、0.56g/(L∙d)，0.74g/(L∙d)、0.56g/(L∙d)；定义有机波动频次为每12天完成高低OLR波动的次数，R1的OLR恒定，R2、R3分别每12天、4天完成一次OLR的高低波动，波动频次分别为0、1、3。由实验结果可知，R1、R2和R3的平均粒径分别可达到318.86μm、426.71μm、593.06μm，胞外聚合物（extracellular polymeric substance，EPS）含量（以volatile suspended solids，VSS计）可达到71.97mg/g、75.88mg/g、80.35mg/g，蛋白质/多糖（protein/polysaccharide，PN/PS）分别为4.24、5.14、5.72，表明波动频次为3时颗粒具有更高的疏水性、稳定性。此外R1、R2、R3的内碳源储存率（internal carbon storage rate，CODin）、同步硝化内源反硝化（simultaneous nitrification internal denitrification rate，SND）率分别为97.06%和44.74%、98.37%和58.20%、98.91%和64.42%、总磷（total phosphorus，TP）平均去除率分别为86.82%、89.36%、92.65%，总氮（total nitrogen，TN）平均去除率分别为71.69%、74.31%、78.55%，说明波动频次为3时颗粒具有更高的碳源利用率与污染物去除能力。

关键词: 好氧颗粒污泥, 有机负荷波动频次, 胞外聚合物, 同步脱氮除磷, 低强度进水

Abstract:

In order to explore the influence of organic load fluctuation frequency on aerobic granular sludge (AGS) under low-intensity influent conditions, three parallel cylindrical sequencing batch reactors(SBR), R1, R2 and R3, were operated by constant organic loading rate (OLR) and two alternating OLR modes respectively, fed with synthetic water. Their high and low OLR were 0.67gCOD/(L∙d)/0.67gCOD/(L∙d), 0.74gCOD/(L∙d)/0.56gCOD/(L∙d) and 0.74gCOD/(L∙d)/0.56gCOD/(L∙d) respectively. The fluctuation frequency of organic load was defined as the number of OLR high-low fluctuation every 12 days, R1’s OLR did not fluctuate, R2 and R3 completed OLR high-low fluctuation every 12 days and 4 days respectively, and their fluctuation frequencies were 0, 1 and 3 respectively. The results showed that the average particle sizes of R1, R2 and R3 were 318.86μm, 426.71μm and 593.06μm, respectively. The extracellular polymeric substance (EPS) content (VSS) were 71.97mg/g, 75.88mg/g and 80.35mg/g, PN/PS were 4.24, 5.14 and 5.72, respectively, indicating that the granules had higher hydrophobicity and stability when the fluctuation frequency was 3. In addition, the internal carbon storage rates (COD_in) of R1, R2 and R3 were 97.06%, 98.37%, 98.91%, respectively, and the internal carbon storage rate (SND) efficiencies were 44.74%, 58.20%, 64.42%, respectively. The average total phosphorus (TP) removal efficiencies were 86.82%, 89.36% and 92.65%, respectively, the average total nitrogen (TN) removal efficiency were 71.69%, 74.31% and 78.55%, respectively, indicating that the granules had higher carbon source utilization efficiency and pollutant removal ability when the fluctuation frequency was 3.

Key words: aerobic granular sludge (AGS), frequency of organic load fluctuation, extracellular polymeric substance (EPS), simultaneous nitrogen and phosphorus removal, low intensity inflow

中图分类号:

X703

李冬, 高飞雁, 解一博, 李柱, 张杰. 有机负荷波动频次对好氧颗粒污泥的影响[J]. 化工进展, 2022, 41(12): 6680-6688.

LI Dong, GAO Feiyan, XIE Yibo, LI Zhu, ZHANG Jie. Effect of organic load fluctuation frequency on aerobic granular sludge[J]. Chemical Industry and Engineering Progress, 2022, 41(12): 6680-6688.

图/表 11

表1 R1、R2、R3运行方式

反应器	低OLR模式每日进水量/L	低OLR/gCOD·L^-1∙d^-1	高OLR模式每日进水量/L	高OLR/gCOD·L^-1∙d^-1	OLR波动频次
R1	10	0.67	10	0.67	0
R2	7	0.56	13	0.74	1
R3	7	0.56	13	0.74	3

表2 人工配水水质情况

项目

COD

/mg·L^-1

NH $4 +$ -N

/mg·L^-1

NO $2 -$ -N

/mg·L^-1

NO $3 -$ -N

/mg·L^-1

PO $4 3 -$ -P

/mg·L^-1

表2 人工配水水质情况

项目

COD

/mg·L^-1

NH $4 +$ -N

/mg·L^-1

NO $2 -$ -N

/mg·L^-1

NO $3 -$ -N

/mg·L^-1

PO $4 3 -$ -P

/mg·L^-1

数值

300±25

45~55

0~2

6~7

7.6~8.0

图1 运行过程中SVI、MLSS、MLVSS的变化

图2 颗粒污泥粒径变化情况

图3 运行过程中EPS含量变化

图4 颗粒污泥三维荧光分析

图5 运行过程中COD浓度变化

图6 运行过程中TP浓度变化

图7 运行期内NH4+-N、NO2--N、NO3--N和TN变化

图8 第60天周期内C、N、P变化情况

表3 第60天的CODu、CODin、PRA、PPAOs和SND率

反应器	COD_u/mg·L^-1	COD_in/%	PRA/mg·L^-1	P_PAOs/%	SND率/%
R1	133.97	97.06	24.56	50.60	44.74
R2	154.61	98.37	29.00	52.27	58.20
R3	172.04	98.91	29.61	59.86	64.62

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