Ultrasonic and ultraviolet coupling degassing and sterilization

doi:10.16085/j.issn.1000-6613.2022-0893

Abstract

Abstract:

At present, the degassing and sterilization treatment of geothermal tail water is mainly carried out by degassing tanks and bactericides. This paper proposed an ultrasonic-ultraviolet coupling degassing and sterilization treatment technology. Ultrasonic-ultraviolet coupling technology was used to degas and sterilize water containing microbubbles and bacteria. The ultrasonic degassing efficiency under different flow conditions, the sterilization efficiency under different flow rates and different ultraviolet irradiation intensity, and the degassing and sterilization efficiency after ultrasonic-ultraviolet coupling were investigated respectively. The results showed that part of the gas can be removed under small flow rate; with the increase of the water flow rate, the gas holdup in the water was basically unchanged and the degassing effect does not increase significantly. Under a certain ultraviolet irradiation intensity, when the water flow was small, the sterilization efficiency was 60%—80%;when the water flow was large, the sterilization efficiency was more than 90%, which was considered to be due to the relatively high turbulence degree and short residence time at large flow rates. Compared with the ultrasonic degassing alone, the degassing efficiency of ultrasonic-ultraviolet coupling was basically unchanged, and the sterilization efficiency was about 90%. The optimal experimental operating parameters are finally determined to be 20kHz, 0.15m³/h and 2000μW/cm².

Key words: ultrasonic, degassing, ultraviolet, sterilization, geothermal water, flow, residence time distribution, gas holdup

摘要：

鉴于地热尾水的脱气或杀菌主要是通过脱气罐和杀菌剂进行处理，本文提出了一种超声波-紫外线耦合的脱气杀菌处理技术。采用超声波-紫外线耦合技术对含微气泡含细菌水进行脱气杀菌处理。分别考察了不同水流量下的超声波脱气效率，不同流量、不同紫外线照射强度下的杀菌效率，以及超声波-紫外线耦合之后的脱气杀菌效率。结果表明，在较小水流量下，可除去部分气体；随着流量的增大，水中的气含率基本不变，脱气效果增加不再明显。在一定的紫外线照射强度下，较大流量时，杀菌效率约为90%以上；在较小流量时，杀菌效率为60%~80%。考虑是由于较大流量下，湍动程度相对较高以及停留时间较短所致。与单独超声波脱气相比，耦合技术的脱气效率基本不变，杀菌效率在90%左右，确定最优的实验操作参数为20kHz、0.15m³/h和2000μW/cm²。

关键词: 超声波, 脱气, 紫外线, 杀菌, 地热水, 流动, 停留时间分布, 气含率

CLC Number:

TQ028.8

XIE Yingchun, WANG Qianqian, MA Yongli, SUN Guoqiang, LIU Mingyan. Ultrasonic and ultraviolet coupling degassing and sterilization[J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1629-1637.

谢迎春, 王倩倩, 马永丽, 孙国强, 刘明言. 超声波与紫外线耦合脱气杀菌[J]. 化工进展, 2023, 42(3): 1629-1637.

Figures/Tables 16

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流量/m³·h^-1	紫外线照射强度/μW·cm^-2	样号
流量/m³·h^-1	紫外线照射强度/μW·cm^-2	5s	30s
0.15	2000	1a	1b
	4000	2a	2b
0.50	2000	3a	3b
	4000	4a	4b
1.0	2000	5a	5b
	4000	6a	6b
3.0	2000	7a	7b
	4000	8a	8b

流量/m³·h^-1	紫外线照射强度/μW·cm^-2	样号
流量/m³·h^-1	紫外线照射强度/μW·cm^-2	5s	30s
0.15	2000	1a	1b
	4000	2a	2b
0.50	2000	3a	3b
	4000	4a	4b
1.0	2000	5a	5b
	4000	6a	6b
3.0	2000	7a	7b
	4000	8a	8b

流量 /m³·h^-1	进口含菌量 /个·mL^-1	样号	出口含菌量 /个·mL^-1	杀菌率 /%
0.15	70×10¹	1a	25×10¹	64.3
		1b	25×10¹	64.3
		2a	0.6×10⁰	99.9
		2b	0×10⁰	99.9
0.50	13×10⁰	3a	2.5×10⁰	80.8
		3b	2.5×10⁰	80.8
		4a	2.5×10⁰	80.8
		4b	0×10⁰	99.9
1.00	25×10¹	5a	2.5×10⁰	99.0
		5b	0.6×10⁰	99.8
		6a	6×10⁰	97.6
		6b	0.6×10⁰	99.8
3.00	25×10¹	7a	13×10⁰	94.8
		7b	6×10⁰	97.6
		8a	2.5×10⁰	99.0
		8b	0×10⁰	99.9

流量 /m³·h^-1	进口含菌量 /个·mL^-1	样号	出口含菌量 /个·mL^-1	杀菌率 /%
0.15	70×10¹	1a	25×10¹	64.3
		1b	25×10¹	64.3
		2a	0.6×10⁰	99.9
		2b	0×10⁰	99.9
0.50	13×10⁰	3a	2.5×10⁰	80.8
		3b	2.5×10⁰	80.8
		4a	2.5×10⁰	80.8
		4b	0×10⁰	99.9
1.00	25×10¹	5a	2.5×10⁰	99.0
		5b	0.6×10⁰	99.8
		6a	6×10⁰	97.6
		6b	0.6×10⁰	99.8
3.00	25×10¹	7a	13×10⁰	94.8
		7b	6×10⁰	97.6
		8a	2.5×10⁰	99.0
		8b	0×10⁰	99.9

流量/m³·h^-1	平均停留时间t_s/min
0.15	42
0.50	29
1.00	10
3.00	5