Experimental study of microelectrolysis coupled with Fenton oxidation for treatment of coalbed methane produced water

doi:10.19965/j.cnki.iwt.2022-0212

Abstract

Abstract:

The degradation effect of emulsion-breaking coagulation and precipitation pretreatment combined with micro-electrolysis coupled with Fenton oxidation process on coalbed methane produced water were investigated. The results showed that the micro-electrolysis coupled with Fenton oxidation process，under the conditions of micro-electrolysis pH 3.0，aeration intensity 150 L/h，Fenton oxidation pH 3.5 and hydrogen peroxide dosage 800 mg/L，the removal rate of micro-electrolysis COD was 66.85%，the removal rate of Fenton COD was 60.30% and the overall COD removal rate reached 86.84%， the final effluent COD of the overall process was 174.21 mg/L. The suspended solids were 2.64 mg/L and the petroleum concentration was 1.21 mg/L. The overall process achieved 99.01% removal of suspended solids，97.40% removal of petroleum and 93.14% removal of COD，which realized the efficient treatment of coalbed methane output wastewater.

Key words: coalbed methane produced water, micro-electrolysis, Fenton oxidation, collaborative micro-aeration

摘要：

探究了破乳混凝沉淀预处理结合微电解耦合Fenton氧化工艺对煤层气产出水的降解效果。结果表明，微电解耦合Fenton氧化工艺，在微电解pH为3.0，曝气强度为150 L/h，Fenton氧化反应pH为3.5，H₂O₂投加量为800 mg/L的条件下，微电解COD去除率为66.85%，Fenton氧化反应COD去除率为60.30%，综合COD去除率达86.84%，整体工艺最终出水COD为174.21 mg/L，悬浮物质量浓度为2.64 mg/L，石油类质量浓度为1.21 mg/L，整体工艺的悬浮物去除率为99.01%，石油类去除率为97.40%，COD去除率为93.14%，实现了煤层气产出废水的高效处理。

关键词: 煤层气产出水, 微电解, Fenton氧化, 协同微曝气

CLC Number:

X703.1

Weicheng ZHENG,Qingqing WANG,Zhongquan WANG,Shulin QIN. Experimental study of microelectrolysis coupled with Fenton oxidation for treatment of coalbed methane produced water[J]. Industrial Water Treatment, 2023, 43(1): 131-136.

郑威城,汪清清,王忠泉,秦树林. 微电解耦合Fenton氧化处理煤层气产出水实验研究[J]. 工业水处理, 2023, 43(1): 131-136.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2022-0212

https://www.iwt.cn/EN/Y2023/V43/I1/131

Figures/Tables 7

Fig. 1 Experimental unit

Fig. 2 Effect of different initial pH on emulsion breaking effect

Fig. 3 The effect of emulsion breaker dosage on emulsion breaking effect

Fig. 4 Effect of different feedwater pH on the effectiveness of microelectrolysis treatment

Fig. 5 Effect of different pH on the effect of Fenton oxidation treatment

Fig. 6 Effect of aeration on COD removal rate of wastewater

Fig. 7 Effect of hydrogen peroxide dosing on the COD removal effect of Fenton oxygen reaction

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