COD Reduction in Coking Wastewater by Loading Bentonite with Amphiphilic Chitosan

doi:10.12422/j.issn.1006-396X.2023.03.008

Abstract

Abstract:

To efficiently remove organics in coking wastewater, this paper prepared an amphiphilic chitosan?loaded bentonite adsorbent (C18CS?BT).The structure and morphology of the adsorbent were characterized by Fourier transform infrared spectroscopy (FT?IR),X?ray diffraction,and scanning electron microscope.By comparing the removal rates of C18CS?BT,unmodified chitosan?loaded bentonite (CS?BT),and bentonite (BT),the study explored the effect mechanism of hydrophobic modified adsorbent on the removal of the organics in coking wastewater.The results show that compared with BT and CS?BT,C18CS?BT features lower dosage, wider application range of pH value,and shorter adsorption equilibrium time.The optimized treatment process is the adsorbent dosage of 1.5 g/L,the adsorption time of 60 min,and the system pH value of 7.0. The COD in coking wastewater after BT, CS?BT and C18CS?BT treatment is reduced from 342 mg/L to 264,218,146 mg/L, and the corresponding removal rates of organics are 22.81%,36.26% and 57.31%, respectively. GC?MS result analysis also confirms that C18CS?BT could remove most of the organics in coking wastewater, especially long?chain alkanes and their derivatives.The hydrophobic modification of the adsorbent can effectively improve the removal performance of organics in coking wastewater.

Key words: Amphiphilic chitosan, Coking wastewater, Adsorbent, Bentonite, Hydrophobic organics

摘要：

为了高效去除焦化废水中的有机物，制备了一种两亲性壳聚糖负载膨润土吸附剂（C18CS?BT）。利用红外光谱、X射线衍射和扫描电镜对吸附剂的结构和表观形貌进行了表征。通过对比C18CS?BT与未改性壳聚糖负载膨润土（CS?BT）和原始膨润土（BT）对焦化废水中有机物的去除率，探究了疏水改性吸附剂对焦化废水中有机物吸附的作用机制。结果表明，与BT和CS?BT相比，C18CS?BT具有加量低、pH应用范围宽、吸附平衡时间短的性能优势；优化后的处理工艺条件为：吸附剂质量浓度为1.5 g/L，吸附时间为60 min，体系pH为7.0。经过BT、CS?BT和C18CS?BT处理后，焦化废水的化学需氧量（COD）由342 mg/L分别降为264、218、146 mg/L，对应焦化废水中有机物的去除率分别为22.81%、36.26%和57.31%。GC?MS分析结果也证实了C18CS?BT能去除焦化废水中的大部分有机物，尤其是长链烷烃及其衍生物。因此，对吸附材料进行疏水改性，可有效提升其对焦化废水中有机物的去除性能。

关键词: 两亲性壳聚糖, 焦化废水, 吸附剂, 膨润土, 憎水有机物

CLC Number:

TQ110.9

Haiqun Kou, Zhou Zhu, Yuchang Zhou, Xindian Lan, Meiying Yu, Haonan Chen. COD Reduction in Coking Wastewater by Loading Bentonite with Amphiphilic Chitosan[J]. Journal of Petrochemical Universities, 2023, 36(3): 52-59.

寇海群, 朱洲, 周瑜昌, 兰新典, 余美莹, 陈浩南. 两亲性壳聚糖负载膨润土降焦化废水COD的研究[J]. 石油化工高等学校学报, 2023, 36(3): 52-59.

Figures/Tables 11

Fig.1 FT?IR of the three adsorbents

Fig.2 XRD of the three adsorbents

Fig.3 N2 adsorption?desorption isotherms curve of the three adsorbents

Fig.4 Pore size distribution curve of the three adsorbents

Fig.5 SEM photographs of the adsorbents

Fig.6 Effect of adsorbent mass concentration on organic icide removal rate

Fig.7 Effect of pH on organic removal rate

Fig.8 Effect of adsorption time on organic removal rate

Fig.9 Performance of three kinds of adsorbents for reducing COD of coace?treated

Fig.10 Total ion flow diagram of coking wastewater before and after C18CS?BT treatment

Table 1 GC?MS analysis results of coking wastewater before and after C18CS?BT treatment

序号	有机物	t/s		A/%
序号	有机物	处理前	处理后	处理前	处理后
1	苯酚	6.728	6.728	8.55	7.05
2	甲基酚	9.228	9.228	2.33	1.54
3	1⁃癸烯	19.921	19.922	13.74	30.12
4	2,4⁃二叔丁基苯酚	20.833	20.827	2.39	2.55
5	邻苯二甲酸二丁酯	30.515	-	2.90	-
6	十七烷	37.297	-	2.30	-
7	1⁃氯⁃十九烷	40.038	-	2.04	-
8	双（2⁃乙基己基）邻苯二甲酸酯	40.514	40.508	3.84	3.13
9	3⁃甲基十六烷	41.244	-	2.51	-
10	十八烷	43.679	-	2.00	-

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