Preparation of diatomaceous earth-based composite filler and its xylene removal performance by a biotrickling filter

doi:10.16085/j.issn.1000-6613.2022-1655

Abstract

Abstract:

Composite fillers containing efficient xylene-degrading bacteria with nutrient slow-release function were prepared by microbial immobilization technique, using diatomaceous earth (DE) as the backbone, and polyvinyl alcohol (PVA) and sodium alginate (SA) as immobilization materials. A biotrickling filter (BTF) was loaded with the composite fillers and the xylene purification performance was investigated. The specific surface area of the composite filler was 4.53m²/g, which had good water-holding capacity,and the composite filler showed good reusability with the removal efficiency maintaining above 95% after continuous treatment of 8 batches of pollutants. After 11 d of operation, the outlet concentration of the BTF loaded with composite filler was below the emission limit [ρ(xylene)=70mg/m³] specified in GB 16297—1996, which indicated that the start-up of the BTF was completed at this time. When the inlet concentration was 1200 mg/m³ and the empty bed residence time (EBRT) was 53s, 38s and 28s, the removal efficiency was 98%、86% and 78%, respectively. When the EBRT was 28s and the inlet concentration was 700mg/m³and 250mg/m³, the removal efficiency was 91% and 99%, respectively. When no additional nutrients were provided for 9d, the removal efficiency did not decrease significantly. When the system was stagnated for 2d and 7d, the performance could be restored within 9.5h and 1d of operation, respectively. The results showed that the composite fillers had better physicochemical properties, good removal performance for xylene, and strong resistance to shock loading and stagnation, which can provide some reference value for its application.

Key words: immobilization, fillers, structural characterization, bioreactors, diatomaceous earth

摘要：

以硅藻土（DE）为骨架，聚乙烯醇（PVA）、海藻酸钠（SA）为固定化材料，采用微生物固定化技术制备出一种包含高效降解菌和具有营养缓释功能的复合填料。探究了装填复合填料生物滴滤塔（BTF）净化二甲苯的性能。复合填料比表面积为4.53m²/g，具有良好的持水能力，且复合填料的重复使用性较好，连续处理8批污染物后，去除效率保持在95%以上。负载复合填料的BTF经过11d运行，出口浓度低于GB 16297—1996中规定的排放限值[ρ(二甲苯)=70mg/m³]，结果表明此时BTF完成启动；进气浓度为1200mg/m³，空床停留时间（EBRT）分别为53s、38s、28s时，去除效率为98%、86%、78%；在EBRT为28s，进气浓度为700mg/m³、250mg/m³时，去除效率分别为91%、99%；在9天内外界不提供养分时，去除效率无明显下降。系统停运2天和7天，分别可在运行9.5h和1天内恢复原来的净化性能。实验结果表明复合填料具有较好理化性质，对二甲苯去除性能好，抗冲击负荷及停滞能力强，可为其应用提供一定参考价值。

关键词: 固定化, 填料, 结构表征, 生物反应器, 硅藻土

CLC Number:

X701

LU Shaojie, LIU Jia, JI Qianzhu, LI Ping, HAN Yueyang, TAO Min, LIANG Wenjun. Preparation of diatomaceous earth-based composite filler and its xylene removal performance by a biotrickling filter[J]. Chemical Industry and Engineering Progress, 2023, 42(7): 3884-3892.

鲁少杰, 刘佳, 冀芊竹, 李萍, 韩月阳, 陶敏, 梁文俊. 硅藻土基复合填料制备及滴滤塔去除二甲苯的性能[J]. 化工进展, 2023, 42(7): 3884-3892.

Figures/Tables 15

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阶段	时间 /天	空床停留时间（EBRT）/s	二甲苯质量浓度 /mg·m^-3	循环液
Ⅰ	1~41	53	1200	营养液
Ⅱ	42~50	53	1200	营养液
	51~57	停滞
	58~64	53	1200
	65~75	38	1200
	76~84	28	1200
Ⅲ	85~91	28	700	营养液
	92~93	停滞
	94~109	28	700
	110~123	28	250
Ⅳ	124~132	28	250	去离子水

阶段	时间 /天	空床停留时间（EBRT）/s	二甲苯质量浓度 /mg·m^-3	循环液
Ⅰ	1~41	53	1200	营养液
Ⅱ	42~50	53	1200	营养液
	51~57	停滞
	58~64	53	1200
	65~75	38	1200
	76~84	28	1200
Ⅲ	85~91	28	700	营养液
	92~93	停滞
	94~109	28	700
	110~123	28	250
Ⅳ	124~132	28	250	去离子水

反应器	污染物	填料	停滞方式	停运时间/d	恢复时间
生物过滤塔^[36]	二甲苯	木炭	完全停滞	10	4d
生物过滤塔^[37]	甲苯	聚氨酯泡沫	完全停滞	10	10d
生物过滤塔^[38]	甲烷	石料	持续提供不含VOCs的潮湿空气	30	15d
生物过滤塔^[13]	氯苯	凝胶胶囊	完全停滞	6 20	3d 8d
生物滴滤塔^[39]	硫化氢	聚氨酯泡沫	完全停滞	2 5	32h 12d
生物滴滤塔	二甲苯	本实验填料	完全停滞	2 7	9.5h 1d

反应器	污染物	填料	停滞方式	停运时间/d	恢复时间
生物过滤塔^[36]	二甲苯	木炭	完全停滞	10	4d
生物过滤塔^[37]	甲苯	聚氨酯泡沫	完全停滞	10	10d
生物过滤塔^[38]	甲烷	石料	持续提供不含VOCs的潮湿空气	30	15d
生物过滤塔^[13]	氯苯	凝胶胶囊	完全停滞	6 20	3d 8d
生物滴滤塔^[39]	硫化氢	聚氨酯泡沫	完全停滞	2 5	32h 12d
生物滴滤塔	二甲苯	本实验填料	完全停滞	2 7	9.5h 1d

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