Adsorption of Cu2+ by autotrophic nitrifying granular sludge and its adsorption isotherm

doi:10.16085/j.issn.1000-6613.2019-1223

Abstract

Abstract:

The autotrophic nitrifying granular sludge was used as the adsorbent to study its adsorption on Cu²⁺ and the optimal adsorption conditions, and its adsorption characteristics were explored. The effects of copper ion concentration, adsorption time, sludge concentration, stirring speed and temperature on the adsorption were studied by single factor experiments. It was found that the stirring speed, adsorption time and sludge concentration had a significant effect on the adsorption. On this basis, the optimum operating point of adsorption was coupled by response surfacemethodtime (A)=2.50h, rotation speed (B)=125r/min, sludge volume (C)=5250mg/L. The adsorption characteristics and stability of granular sludge were studied under these conditions. The results showed that the nitrifying granular sludge showed strong tolerance and stability in heavy metal wastewater, and the granulation rate remained above 93% at different Cu²⁺concentrations. The results of dynamic fitting of Langmuir and Freundlich equations showed that the fitting degree of Langmuir isotherm equation was R²_Cu=0.999, which indicated that nitrification granular sludge was a typical monolayer adsorption for Cu²⁺， and the maximum adsorption capacity can be described as Q_max=15.02mg/g. In the fitting process of the Freundlich isotherm equation, the correlation coefficient R²_Cu was 0.969, 1/n was 0.1305, indicating that the nitrification granular sludge had strong adsorption capacity for Cu²⁺. The higher fitting degree also indicated that the adsorption of Cu²⁺ by nitrifying granular sludge was a complex physical and chemical process.

Key words: nitrifying granular sludge, Cu²⁺, kinetics, response surface methodology, stability, adsorption

摘要：

以自养硝化颗粒污泥作为吸附剂，研究了其对铜离子的吸附效果及最佳吸附工艺条件，并探索了其吸附等温线。通过单因素实验研究铜离子浓度、吸附时间、污泥浓度、搅拌速度和温度对吸附效果的影响，最终得出搅拌速度、吸附时间以及污泥浓度对吸附效果有明显影响。在此基础上，通过响应曲面法耦合出吸附的最佳工况点：时间（A）=2.50h，转速（B）=125r/min，污泥量（C）=5250mg/L。在此条件下研究了颗粒污泥的吸附特性及稳定性。结果表明，硝化颗粒污泥在重金属废水中表现出极强的耐受性与稳定性，不同浓度下颗粒化率均维持在93%以上。Langmuir与Freundlich方程动力学拟合结果显示：Langmuir等温方程的拟合度R²_Cu=0.999，表明硝化颗粒污泥对于Cu²⁺属于典型的单分子层吸附，且能描述最大吸附量为Q_max=15.02mg/g。Freundlich等温方程的拟合过程中，相关系数R²_Cu=0.969，1/n=0.1305，表明硝化颗粒污泥对Cu²⁺吸附能力较强；较高的拟合度也在一定程度上表明硝化颗粒污泥对Cu²⁺的吸附是一个复杂的物理化学过程。

关键词: 硝化颗粒污泥, 铜离子, 动力学, 响应曲面法, 稳定性, 吸附

CLC Number:

X703

Binchao ZHANG,Minjing ZENG,Linan ZHANG,Hongxin WANG,Yu ZENG,Sinong HUANG,Junfeng WU,Yuanyuan CHENG,Bei LONG. Adsorption of Cu²⁺ by autotrophic nitrifying granular sludge and its adsorption isotherm[J]. Chemical Industry and Engineering Progress, 2020, 39(4): 1583-1590.

张斌超,曾敏静,张立楠,王洪欣,曾玉,黄思浓,吴俊峰,程媛媛,龙焙. 自养硝化颗粒污泥吸附铜离子性能及吸附等温线[J]. 化工进展, 2020, 39(4): 1583-1590.

Figures/Tables 8

序号	变量	吸附时间t/h	搅拌速度v/r·min^-1	污泥浓度c/mg·L^-1	mg·L^-1 Cu²⁺浓度c/	温度T/℃
1	初始Cu²⁺浓度	3.0	125	4500	20	25
2	初始Cu²⁺浓度	3.0	125	4500	50	25
3	初始Cu²⁺浓度	3.0	125	4500	100	25
4	初始Cu²⁺浓度	3.0	125	4500	150	25
5	初始Cu²⁺浓度	3.0	125	4500	200	25
6	吸附时间	1.5	125	4500	50	25
7	吸附时间	2.0	125	4500	50	25
8	吸附时间	2.5	125	4500	50	25
9	吸附时间	3.0	125	4500	50	25
10	吸附时间	3.5	125	4500	50	25
11	吸附时间	1.5	125	4500	100	25
12	吸附时间	2.0	125	4500	100	25
13	吸附时间	2.5	125	4500	100	25
14	吸附时间	3.0	125	4500	100	25
15	吸附时间	3.5	125	4500	100	25
16	污泥浓度	3.0	125	1500	50	25
17	污泥浓度	3.0	125	2250	50	25
18	污泥浓度	3.0	125	4500	50	25
19	污泥浓度	3.0	125	6750	50	25
20	污泥浓度	3.0	125	9000	50	25
21	污泥浓度	3.0	125	1500	100	25
22	污泥浓度	3.0	125	2250	100	25
23	污泥浓度	3.0	125	4500	100	25
24	污泥浓度	3.0	125	6750	100	25
25	污泥浓度	3.0	125	9000	100	25
26	搅拌速度	3.0	100	4500	50	25
27	搅拌速度	3.0	125	4500	50	25
28	搅拌速度	3.0	150	4500	50	25
29	搅拌速度	3.0	175	4500	50	25
30	搅拌速度	3.0	200	4500	50	25
31	搅拌速度	3.0	100	4500	100	25
32	搅拌速度	3.0	125	4500	100	25
33	搅拌速度	3.0	150	4500	100	25
34	搅拌速度	3.0	175	4500	100	25
35	搅拌速度	3.0	200	4500	100	25
36	温度	3.0	125	4500	50	15
37	温度	3.0	125	4500	50	20
38	温度	3.0	125	4500	50	25
39	温度	3.0	125	4500	50	30
40	温度	3.0	125	4500	50	35
41	温度	3.0	125	4500	100	15
42	温度	3.0	125	4500	100	20
43	温度	3.0	125	4500	100	25
44	温度	3.0	125	4500	100	30
45	温度	3.0	125	4500	100	35

序号	A	B	C	Y
1	3.0	150	5250	93.55
2	2.5	100	9000	95.5
3	2.0	125	1500	50.8
4	2.5	125	5250	89.25
5	2.5	150	1500	30.8
6	2.0	150	5250	83.35
7	2.5	125	5250	79.75
8	2.0	100	5250	84
9	2.5	125	5250	98.45
10	3.0	125	9000	94.85
11	3.0	100	5250	82.05
12	3.0	125	1500	33.1
13	2.5	100	1500.	51.8
14	2.0	125	9000	95.5
15	2.5	125	5250	87.95
16	2.5	150	9000	96.5
17	3.0	150	5250	84.35

实测值		Langmuir		Freundlich
C₀/mg·L^-1	C_e/mg·L^-1	Q_e/mg·g^-1	C_e/Q_e	lgC_e	lgQ_e
40	1.4	7.3524	0.1904	0.1461	0.8664
60	7.825	9.9381	0.7874	0.8935	0.9973
100	30.5	11.3333	2.6912	1.4843	1.0544
160	85.2	14.2476	5.9799	1.9304	1.1537
240	164.75	14.3333	11.4942	2.2168	1.1563
320	244	14.4762	16.8553	2.3874	1.1607
400	321.5	14.9524	21.5016	2.5072	1.1747

吸附等温方程	经验公式	线性形式	线性拟合方程
Langmuir	$Q e = Q m a x b C e 1 + b C e$	$C e Q e = 1 b Q m a x + C e Q m a x$	y=0.0666x+0.3638
Freundlich	$Q e = K C e 1 / n$	$l g Q e = l g K + 1 n l g C e$	y=0.1305x+0.8648

吸附等温方程	经验公式	线性形式	线性拟合方程
Langmuir	$Q e = Q m a x b C e 1 + b C e$	$C e Q e = 1 b Q m a x + C e Q m a x$	y=0.0666x+0.3638
Freundlich	$Q e = K C e 1 / n$	$l g Q e = l g K + 1 n l g C e$	y=0.1305x+0.8648

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Adsorption of Cu²⁺ by autotrophic nitrifying granular sludge and its adsorption isotherm

自养硝化颗粒污泥吸附铜离子性能及吸附等温线

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