Experimental study on treatment of drilling engineering wastewater by ozone micro-nano bubble technology for oil and gas fields
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摘要:
随着清洁化生产的深入推进和环保意识的提高，对作业现场的钻井废水及其处理方式的要求越来越严格。针对钻井废水稳定性高、化学需氧量（COD）高、色度高、降解难的特点，采用微纳米气泡技术以提高气体利用率和传质效果，结合臭氧对难降解的高浓度有机污染物进行降解。室内模拟试验表明，经过预处理后再采用臭氧微纳米气泡技术处理，COD从47 328 mg/L降至131 mg/L，去除率达到99.7%，TOC从15 146 mg/L降至65.2 mg/L，去除率达到99.6%，COD和TOC的去除率均超过99.5%，臭氧微纳米气泡技术对高色度和高COD具有显著的去除效果。采用絮凝沉淀、芬顿工艺配合臭氧微纳米气泡技术能够降低臭氧投加量，从而降低投资和运行成本，是一种经济高效的处理方法。
Abstract:As the "blood" of drilling engineering in petroleum industry, drilling fluid plays a very important role in the process of oil and gas exploration and development. At the job site, drilling fluid is also an important source of drilling wastewater. With the further promotion of cleaner production and the improvement of environmental awareness, the requirements of drilling wastewater and its treatment on the job site have become more and more stringent. In response to the characteristics of good stability, high chemical oxygen demand and difficult degradation of drilling wastewater, micro-nano bubbles were used to improve gas utilization and mass transfer effect, and ozone gas was used to degrade high-difficulty and high-concentration organic matter. The aim was to solve the problems of high chromaticity and high COD of drilling wastewater. The indoor simulation experiment showed that after pretreatment, by using ozone micro-nano bubble technology, COD decreased from 47 328 mg/L to 131 mg/L, with the removal rate of 99.7%, and TOC decreased from 15 146 mg/L to 65.2 mg/L, with the removal rate of 99.6%. The removal rates of COD and TOC could reach more than 99.5%, and the ozone micro-nano bubble technology had a significant removal effect on high chromaticity and high COD. The experiment also showed that the flocculation precipitation and Fenton process combined with ozone micro-nano bubble technology could reduce the amount of ozone added, thereby reducing the investment and operating costs, making it an economical and efficient treatment method.
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图 1 激光粒度仪检测清水中空气纳米气泡粒径及浓度分布
Figure 1. Size and concentration distribution of air nanobubbles in clean water detected by laser particle size analyzer
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图 4 配方2# ORP和pH、COD和TOC随臭氧投加量的变化
Figure 4. ORP and pH , COD and TOC concentration of formula 2# solution changes with different ozone dosage
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图 6 配方3#稀释液ORP、pH、COD和TOC随臭氧投加量的变化
Figure 6. ORP, pH , COD and TOC concentration of formula 3# dilution solution changes with different ozone dosage
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图 7 配方4#稀释液ORP、pH、COD和TOC随臭氧投加量的变化
Figure 7. ORP, pH , COD and TOC concentration of formula 4# dilution solution changes with different ozone dosage
表 1 药剂配方
Table 1 Reagent formulations
g/L 配方
序号LIGTROL® ENCAPIN®FA SULASPHA® ENCAPIN®KP SMPTROL® 氢氧化钠 氯化钠 1# 0 2 0 2 0 0 0 2# 20 1.5 0 1.5 20 2 0 3# 20 1.5 10 1.5 20 2 — 4# 20 1.5 10 1.5 20 2 100 
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表 2 试验水质参数
Table 2 Parameters of experimental water quality
配方序号 COD/（mg/L） pH TDS/（mg/L） 色度 1# 2 695 8.62 5 170 0 2# 40 304 12.26 13 500 20 000 3# 47 328 11.39 16 450 40 000 4# 31 308 12.29 106 500 100 000
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表 3 处理过程中配方3#溶液参数变化
Table 3 Parameters of formula 3# solution during processing
工艺流程 TOC COD 浓度/（mg/L） 去除率/% 数值/（mg/L） 去除率/% 原液 15 146 47 328 絮凝沉淀 2 805 81.5 7 854 83.4 芬顿 668.5 95.6 1 671 96.5 臭氧微纳米气泡 65.2 99.6 131 99.7
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