摘要：

通过Fe²⁺活化过硫酸盐（过二硫酸盐PDS）体系强化聚磺钻井废液固液分离。单因素实验表明，在pH为3~11，PDS投加量为12~32 mmol/L，Fe²⁺投加量为12~32 mmol/L的条件下，出水率均在85%以上，最高可达91.66%。采用响应曲面法系统考察了Fe²⁺投加量、PDS投加量以及pH对上清液悬浮物浓度的影响，并建立了相应的多相回归模型。结果表明，固液分离效果最佳的反应条件为PDS投加量19.8 mmol/L、Fe²⁺投加量24.8 mmol/L、pH 6.72。此条件下，上清液悬浮物预测值为80.36 mg/L，实际实验结果为82.33 mg/L，与预测值接近，证明了该模型的可靠性。通过猝灭实验发现该体系中SO₄ ^·-及非自由基¹O₂发挥着主要破胶作用。Zeta电位分析表明，聚磺钻井废液中固体颗粒脱稳主要通过吸附架桥和网捕卷扫机制实现。经济评估显示，该技术的处理成本为17.88元/m³，低于现有其他研究技术，具有进一步研究及工业化应用潜力。

关键词: 过硫酸盐, Fe²⁺活化, 聚磺钻井废液, 固液分离, 破胶, 响应曲面

Abstract:

The solid-liquid separation of polysulfonated drilling waste fluids by Fe²⁺-activated persulfate (Peroxodisulfate, PDS) system. Single-factor experiments demonstrated that within the conditions of pH 3-11, PDS dosage of 12-32 mmol/L, and Fe²⁺ dosage of 12-32 mmol/L, the effluent rate remained above 85%, with the maximum reaching 91.66%. The response surface methodology (RSM) was employed to systematically investigate the effects of Fe²⁺ dosage, PDS dosage, and pH on the suspended solids (SS) concentration of the supernatant, and a corresponding multiple regression model was established. The results showed that the optimal reaction conditions for solid-liquid separation were determined as follows: PDS dosage of 19.8 mmol/L, Fe²⁺ dosage of 24.8 mmol/L, and pH of 6.72. Under these conditions, the predicted SS concentration of the supernatant was 80.36 mg/L, while the actual experimental result was 82.33 mg/L, which was close to the predicted value, verifying the reliability of the model. Quenching experiments revealed that sulfate radicals (SO₄ ^·-) and non-radical singlet oxygen (¹O₂) played dominant roles in this system. Zeta potential analysis indicated that the destabilization of solid particles in the polysulfonated drilling waste fluid was mainly achieved through the mechanisms of adsorption bridging and sweep flocculation. Economic evaluation showed that the cost of this technology was 17.88 yuan per cubic meter, which was lower than that of other existing technologies reported in relevant studies, indicating its potential for further research and industrial application.

Key words: persulfate, Fe²⁺ activation, polysulfonated drilling waste fluid, solid-liquid separation, gel breaking, response surface methodology(RSM)

中图分类号: 

• X741

• X703