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Copyright of Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A 200 m3/d biochemical-ultrafiltration wastewater treatment process was established at a water injection station in Shengli oilfield, which was used for low permeability reservoir reinjection. The biochemical process adopted mobile bed biofilm (MBBR) process with tubular hollow fiber membrane was used for ultrafiltration. The water quality analysis, process start-up, initial debugging and water quality tracking detection of different nodal water were studied in depth. The system was put into operation in June 2018 with a normal operation till now. Through the treatment process, the pressure difference of ultrafiltration across the membrane increased from 0. 018 MPa to 0. 028 MPa, the oil concentration of sewage decreased from 12 — 659 mg/L to 0. 0 — 0. 3 mg/L, and the concentration of suspended matter decreased from 15 — 255 mg/L to 0. 1 — 0. 3 mg/L. Additionally, the number of SRB decreased from 25 — 60/mL to 0, the median particle size decreased to 0. 86 — 1. 00 pm, and the COD value decreased from 216 — 505 mg/L to 73 — 123 mg/L, showing better effects than a class of water of SY/T 5329 — 2012. [ABSTRACT FROM AUTHOR]

Copyright of Chemical Engineering of Oil & Gas / Shi You Yu Tian Ran Qi Hua Gong is the property of PetroChina Southwest Oil & Gas Field Company and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to mitigate the membrane fouling problem in the present heavy oil wastewater treatment process, wastewater quality and membrane foulants were analyzed to determine that organic fouling was the main fouling mechanism. According to the characteristics of the heavy oil wastewater pollutants, high efficient degrading bacteria were screened by the restrictive cultivate technology. The strain was identified to be pseudomonas and bacillus. Then biological treatment unit was added in the existing process and simulation process was established. The results of long-term running experiments showed that the oil content and COD could be decreased from 11-20 mg/L and 216-350 mg/L to 0.6-1.1 mg/L and 53-88 mg/L respectively. Therefore organic pollutants in the heavy oil wastewater were degraded effectively by biological treatment. Besides, the membrane flux loss was below 15%. The microscopic observation of membrane surface also showed that membrane fouling was inhibited effectively. [ABSTRACT FROM AUTHOR]

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)