Advanced treatment of small molecular organic in shale gas produced water

doi:10.16085/j.issn.1000-6613.2023-1046

Abstract

Abstract:

The treatment of small molecular organic matter in shale gas produced water by reverse osmosis membrane is often difficult to reach the standard. In order to solve this problem, three processes of ozone catalytic oxidation, activated carbon adsorption and catalytic ozonation coupled activated carbon adsorption were studied and compared in terms of the treatment effect of shale gas production water. The influencing factors in the first two processes on the advanced treatment of small molecular organic matter in shale gas produced water and the treatment effects of the coupling process were investigated. The results showed that using the ozone catalytic oxidation process under the optimal reaction conditions of pH 8, reaction time 120min and ozone dosage 0.8g/L, the ozone consumption m(O₃)∶m(COD_Cr) is 3.58, the COD_Cr decreased from 143mg/L to 68.6mg/L, and the removal rate was 52.03%. Using the activated carbon adsorption process under the optimal reaction conditions of pH 8, reaction time 90min and filling ratio of activated carbon 30%, the COD_Cr decreased from 143mg/L to 103.2mg/L, and the removal rate was only 27.83%. Using catalytic ozonation coupled activated carbon adsorption process under the optimal reaction conditions, the ozone consumption m(O₃)∶m(COD_Cr) was 2.78—2.88,the COD_Cr decreased steadily from 143mg/L to 25—34mg/L, and the removal rate was between 76.2% and 82.5%. It could be seen that the catalytic ozonation coupled activated carbon adsorption process had the best treatment effect on small molecular organic matter.

Key words: shale gas produced water, small molecule, ozone catalytic oxidation, adsorption

摘要：

页岩气采出水中小分子有机物通过反渗透膜处理往往也难以达标，为了解决这一问题，研究对比了臭氧催化氧化、活性炭吸附、臭氧催化耦合活性炭吸附三种工艺处理页岩气采出水的效果，考察了前两个工艺对采出水中小分子有机物深度处理的影响因素及耦合工艺的处理效果，结果表明：臭氧催化氧化工艺在pH为8左右、反应时间120min、臭氧投加量0.8g/L的最佳反应条件下，臭氧消耗量m(O₃)∶m(COD_Cr)=3.58，COD_Cr从143mg/L降低至68.6mg/L，去除率52.03%。活性炭吸附工艺在pH为8左右、反应时间90min、活性炭填充比30%的最佳反应条件下，COD_Cr从143mg/L降低至103.2mg/L，去除率只有27.83%。臭氧催化耦合活性炭工艺在最佳反应条件下臭氧消耗量m(O₃)∶m(COD_Cr)=2.78~2.88，COD_Cr从143mg/L稳定降低至25~34mg/L，去除率在76.2%~82.5%，可见臭氧催化耦合活性炭工艺对小分子有机物的处理效果最好。

关键词: 页岩气采出水, 小分子, 臭氧催化氧化, 吸附

CLC Number:

X703

HU Junjie, HUANG Xingjun, LEI Cheng, YANG Min, LAN Yuanxiao, LUO Jianhong. Advanced treatment of small molecular organic in shale gas produced water[J]. Chemical Industry and Engineering Progress, 2024, 43(8): 4674-4680.

胡君杰, 黄兴俊, 雷成, 杨敏, 兰元宵, 罗建洪. 页岩气采出水中小分子有机物的深度处理[J]. 化工进展, 2024, 43(8): 4674-4680.

Figures/Tables 11

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序号	名称	分子式	相对分子量	出峰时间/min
1	环己酮	C₆H₁₀O	98	5.75
2	对苯醌	C₆H₄O₂	108	6.6
3	氯化-(4-羟基苯基)-二甲基磺	C₈H₁₁ClOS	190	8.1
4	苯胺	C₆H₇N	93	9.3
5	双季戊四醇	C₁₀H₂₂O₇	254	12.5
6	N,N-二甲基吡咯烷-2-甲酰胺	C₇H₁₄N₂O	142	14.25
7	萘	C₁₀H₈	128	15.8

序号	名称	分子式	相对分子量	出峰时间/min
1	环己酮	C₆H₁₀O	98	5.75
2	对苯醌	C₆H₄O₂	108	6.6
3	氯化-(4-羟基苯基)-二甲基磺	C₈H₁₁ClOS	190	8.1
4	苯胺	C₆H₇N	93	9.3
5	双季戊四醇	C₁₀H₂₂O₇	254	12.5
6	N,N-二甲基吡咯烷-2-甲酰胺	C₇H₁₄N₂O	142	14.25
7	萘	C₁₀H₈	128	15.8

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