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Study on biological contact oxidation treatment technology of ultra-hypersaline methanol-containing gas field produced water
Received date: 2024-12-10
Online published: 2025-10-27
The salinity of produced water from the Tarim oil and gas field in Xinjiang ranged from 10% to 20% and the wastewater contained the antifreeze methanol.To realize the resource utilization of freshwater and salt，it is essential to establish a sustainable and economic method for the degradation of organics.Due to the excellent salinity tolerance，biological contact oxidation reactor（BCOR） technology has been utilized to treat methanol-containing gas produced water（3.9% salinity）.However，the treatment efficiency under higher salinity conditions is still unclear.In this study，the synthetic methanol wastewater with 20% salinity was used as target wastewater.R1 and R2 were conducted to evaluate the treatment efficiency using direct start-up strategy and gradient salinity-elevation acclimation strategy，respectively.The results showed that the TOC removal efficiency of R1 was varied at 37.5%~77.6% with the influent TOC of 125 mg/L，reflecting its poor performance.The TOC removal efficiency of R2 was remained stable at 85.7%~93.6% with the influent TOC of 500 mg/L under salinities of 11%~13%，however，it was decreased to 61.6%~81.8% accompanied by significant methanol volatilization under salinities of over 15%，with the floatation and loss of sludge.Bacterial community analysis revealed that genera Methylophaga and Halomonas predominated at 13% salinity，while the abundance of genus Methylophaga decreased significantly with salinity exceeding 15%.Overall，the gradient salinity-elevation acclimation strategy significantly enhanced the performance of BCOR in treatment of ultra-high salinity wastewater.However，the effect of this strategy was limited in treatment of extremely high salinity wastewater（17%~20%）.This study provided reference for the biological treatment of ultra-hypersaline methanol-containing wastewater.
KANG Jianming , HAN Xushen , JIN Yan , YU Jianguo . Study on biological contact oxidation treatment technology of ultra-hypersaline methanol-containing gas field produced water[J]. Inorganic Chemicals Industry, 2025 , 57(10) : 98 -102 . DOI: 10.19964/j.issn.1006-4990.2024-0661
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