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<p>The petroleum industry faces a growing need for sustainable treatment of sour produced water to prevent the release of toxic hydrogen sulfide (H<sub>2</sub>S), which poses serious environmental and health risks. Capturing and removing H<sub>2</sub>S remains a significant economic and environmental challenge, highlighting the importance of advancing effective H<sub>2</sub>S mitigation technologies. This work evaluated a green, in house material, <span>l</span>-arginine, at varying concentrations as a novel absorbent for H<sub>2</sub>S removal from both deionized water (DIW) and produced water (PW). The compound was thoroughly characterized and its performance benchmarked against a commercial triazine-based scavenger. The assessment emphasized removal efficiency over different concentrations, contact times, and operating temperatures (25&#xa0;°C and 50&#xa0;°C). <span>l</span>-arginine substantially increased the pH of both DIW and PW, reaching 10 to 11 in DIW and 9 to 10 in PW. Both <span>l</span>-arginine and triazine achieved exceptional H<sub>2</sub>S removal, sustaining 99 to 100%. Notably, even at 0.1 wt% <span>l</span>-arginine reduced H<sub>2</sub>S from 990 ppm to ≤ 6 ppm in both water types, while higher concentrations achieved complete removal. Salts in PW (e.g., NaCl, CaCl<sub>2</sub>, etc.) had minimal impact on <span>l</span>-arginine’s effectiveness, and its performance remained stable at 50&#xa0;°C, demonstrating resilience to temperature variation. It also showed excellent durability, achieving complete H<sub>2</sub>S removal within 2&#xa0;h and maintaining levels below detection for at least 4&#xa0;h. Overall, <span>l</span>-arginine emerges as a promising, ecofriendly, and effective alternative absorbent for H<sub>2</sub>S removal from produced water that rivals or outperforms commercial treatments. By mitigating H<sub>2</sub>S, <span>l</span>-arginine helps reduce environmental hazards. This work represents the first comprehensive comparison of <span>l</span>-arginine’s H<sub>2</sub>S scavenging performance with a commercial triazine benchmark under varied salinity, temperature, and time conditions.</p>

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Utilizing l-arginine as an eco-friendly absorbent for hydrogen sulfide mitigation in produced water

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月8日

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  • Ashraf Ahmed,
  • Salaheldin Elkatatny,
  • Ibtisam Bin Sharfan,
  • Ahmed Al-Yaseri

摘要

The petroleum industry faces a growing need for sustainable treatment of sour produced water to prevent the release of toxic hydrogen sulfide (H2S), which poses serious environmental and health risks. Capturing and removing H2S remains a significant economic and environmental challenge, highlighting the importance of advancing effective H2S mitigation technologies. This work evaluated a green, in house material, l-arginine, at varying concentrations as a novel absorbent for H2S removal from both deionized water (DIW) and produced water (PW). The compound was thoroughly characterized and its performance benchmarked against a commercial triazine-based scavenger. The assessment emphasized removal efficiency over different concentrations, contact times, and operating temperatures (25 °C and 50 °C). l-arginine substantially increased the pH of both DIW and PW, reaching 10 to 11 in DIW and 9 to 10 in PW. Both l-arginine and triazine achieved exceptional H2S removal, sustaining 99 to 100%. Notably, even at 0.1 wt% l-arginine reduced H2S from 990 ppm to ≤ 6 ppm in both water types, while higher concentrations achieved complete removal. Salts in PW (e.g., NaCl, CaCl2, etc.) had minimal impact on l-arginine’s effectiveness, and its performance remained stable at 50 °C, demonstrating resilience to temperature variation. It also showed excellent durability, achieving complete H2S removal within 2 h and maintaining levels below detection for at least 4 h. Overall, l-arginine emerges as a promising, ecofriendly, and effective alternative absorbent for H2S removal from produced water that rivals or outperforms commercial treatments. By mitigating H2S, l-arginine helps reduce environmental hazards. This work represents the first comprehensive comparison of l-arginine’s H2S scavenging performance with a commercial triazine benchmark under varied salinity, temperature, and time conditions.