Study on Adsorption Performance of Modified Activated Sludge Biochar for Phenol in Water

doi:10.3969/j.issn.1672-6952.2022.03.004

Abstract

Abstract:

Using sludge from municipal sewage treatment plants as raw materials, sodium bicarbonate as green activator, and ammonium phosphate as nitrogen and phosphorus source, modified sludge biochar was prepared by vacuum pyrolysis. SEM and FT?IR were used to characterize and analyze the materials. The results show that the modified sludge biochar can significantly increase the specific surface area and porosity of the biochar, as well as the number of N-H and C-O. By changing the dosage of modified sludge biochar, pollutant mass concentration, reaction temperature and pH value and other conditions, the effect of modified sludge biochar on phenol adsorption was studied, and the adsorption process and mechanism were studied. The results show that the modified sludge biochar has a better adsorption effect on phenols, and the adsorption rate increases with the increase in the dosage of sludge biochar; when the pollutant mass concentration increases, the adsorption rate decreases; the higher the temperature, the better the adsorption effect; the acidic conditions are more suitable for the reaction. The adsorption process of modified sludge biochar for phenols conforms to quasi?second?order kinetics, and the adsorption mechanisms are monolayer adsorption and uneven surface adsorption. Modified sludge biochar has good recyclability and it can provide an effective way for the resource utilization of sludge and the treatment of phenols in wastewater.

Key words: Activated sludge, Modification, In?situ pyrolysis, Phenol, Adsorption

摘要：

以城市生活污水处理厂污泥为原料、碳酸氢钠为绿色活化剂、磷酸铵为氮磷源，采用真空热解法制备改性污泥生物炭，并采用SEM、FT?IR对材料进行了表征分析。结果表明，污泥生物炭改性后，可显著提高生物炭比表面积和孔隙度，以及N—H和C—O数量。研究了改性污泥生物炭投加量、污染物质量浓度、反应温度和pH等条件对苯酚吸附效果的影响，以及吸附的过程与机理。结果表明，改性污泥生物炭对苯酚有更好的吸附效果，吸附率随改性污泥生物炭投加量的增大而增大；当污染物质量浓度增大时，吸附率降低；反应温度越高，吸附效果越好；酸性条件有利于反应的进行。改性污泥生物炭对苯酚的吸附过程符合准二级动力学，吸附机理为单分子层吸附和不均匀的表面吸附。改性污泥生物炭具有良好的再生利用性能，可为污泥资源化利用及废水中苯酚的处理提供有效途径。

关键词: 活性污泥, 改性, 原位热解, 苯酚, 吸附

CLC Number:

X799

Yongxin Fei, Huiqiang Ma, Shuang Li. Study on Adsorption Performance of Modified Activated Sludge Biochar for Phenol in Water[J]. Journal of Liaoning Petrochemical University, 2022, 42(3): 19-24.

费永鑫, 马会强, 李爽. 改性活性污泥生物炭对水中苯酚吸附性能研究[J]. 辽宁石油化工大学学报, 2022, 42(3): 19-24.

Figures/Tables 10

References 13

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模型	参数	数值
准一级动力学模型	k₁	0.009 91
	q_e	0.439
	R²	0.528 60
准二级动力学模型	k₂	0.480 00
	q_e	3.510
	R²	0.999 79

模型	参数	数值
准一级动力学模型	k₁	0.009 91
	q_e	0.439
	R²	0.528 60
准二级动力学模型	k₂	0.480 00
	q_e	3.510
	R²	0.999 79

模型	参数	数值
Langmuir 吸附等温模型	K_L	0.47
	q_e	6.71
	R²	0.989 00
Freundlich 吸附等温模型	K_f	2.48
	1/n	0.279 994
	R²	0.998 70

模型	参数	数值
Langmuir 吸附等温模型	K_L	0.47
	q_e	6.71
	R²	0.989 00
Freundlich 吸附等温模型	K_f	2.48
	1/n	0.279 994
	R²	0.998 70

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