Pretreatment of tobacco sugar flavoring wastewater by nano layered iron-manganese bimetallic catalysts activating peroxymonosulfate

doi:10.16085/j.issn.1000-6613.2022-0001

Abstract

Abstract:

Water quality investigation were carried out on the waste water from a sugar and spice kitchen. The nano iron manganese catalyst was synthesized by co-precipitation method and utilized to activate peroxymonosulfate to produce active radicals for the degradation of sugar flavoring wastewater. The catalyst was characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray energy spectrometry (EDS) and Brunauer Emmett Teller (BET). Effects of different condition factors on the degradation efficiencies of COD and ammonia nitrogen were investigated. Under the optimum conditions of 6h reaction time, PMS concentration 4mmol/L and catalyst dosage 0.6g/L, the removal rates of COD and ammonia nitrogen were 76.5% and 96.3% respectively, and the degradation process followed first-order kinetics (R²>0.9). Three-dimensional fluorescence and gas chromatography analysis of the water samples before and after degradation showed that the nonbiodegradable substances were converted into bioavailable organic carbon sources, which indicated that this system as a pretreatment could help to improve the biochemical treatment efficiency and thus has a good application prospect in advanced oxidation of wastewater treatment.

Key words: peroxymonosulfate, catalyst activation, sugar flavoring wastewater, chemical oxygen demand, nano layered iron, radical

摘要：

以烟草行业糖香料废水为研究对象，首先调查了某糖香料调配中心废水的水质情况。采用共沉淀法制备纳米片层铁锰双金属催化剂激活过一硫酸盐（PMS）产生自由基对烟草糖香料废水开展预处理研究。采用透射电子显微镜（TEM）、X射线粉末衍射仪（XRD）、X射线能谱分析（EDS）和比表面积测试（BET）对催化剂进行表征。通过因素实验分析降解过程中废水的化学需氧量和氨氮降解情况，在反应时间6h、PMS浓度为4mmol/L、催化剂投加量为0.6g/L的最佳条件下，COD去除率76.5%、氨氮去除率96.3%，降解过程符合一级动力学（R²＞0.9）。降解前后水样的三维荧光和气相色谱显示，难降解物质被转化为可生物利用的有机碳源，表明这一体系作为预处理有助于提高生化段的处理效率，对高级氧化法在污水预处理中的实际应用具有良好的应用前景。

关键词: 过一硫酸盐, 催化剂活化, 糖香料废水, 化学需氧量, 纳米片层, 自由基

CLC Number:

XUE Yuwei, YE Xiaozhen, ZENG Jing, WANG Yongquan, HONG Junming. Pretreatment of tobacco sugar flavoring wastewater by nano layered iron-manganese bimetallic catalysts activating peroxymonosulfate[J]. Chemical Industry and Engineering Progress, 2022, 41(10): 5661-5668.

薛雨微, 叶校圳, 曾静, 王永全, 洪俊明. 纳米片层铁锰双金属催化剂活化过[J]. 化工进展, 2022, 41(10): 5661-5668.

Figures/Tables 16

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生产线名称	名称	每月产生量/t	COD/mg·L^-1
201料液调配线	过期废料液	0.8~1	52000
	换牌清洗液	94.5	50000
	除异味换水	10	4800
	换牌清洗液	48.6	16000
303香料基调配线	换牌清洗水	32.4	19000
	除异味换水	4.5	3200
303提取线	除异味换水	2.5	1920

生产线名称	名称	每月产生量/t	COD/mg·L^-1
201料液调配线	过期废料液	0.8~1	52000
	换牌清洗液	94.5	50000
	除异味换水	10	4800
	换牌清洗液	48.6	16000
303香料基调配线	换牌清洗水	32.4	19000
	除异味换水	4.5	3200
303提取线	除异味换水	2.5	1920

混合废水指标	值
COD/mg·L^-1	12240
氨氮/mg·L^-1	2246.39
pH	5.46
浊度/NTU	5.03

混合废水指标	值
COD/mg·L^-1	12240
氨氮/mg·L^-1	2246.39
pH	5.46
浊度/NTU	5.03

PMS浓度/mmol·L^-1	K/h^-1	R²
2	0.128	0.988
4	0.156	0.989
6	0.173	0.986