Considerations on the possibility of microbial clogging of re-injection wells of the wastewater generated in a water-dissolved natural gas field

Yuichi Sugai, Kyuro Sasaki, Ryo Wakizono, Yasunori Higuchi, Noriyuki Muraoka

研究成果: Contribution to journalArticle査読

10 被引用数 (Scopus)

抄録

Brine produced from water-dissolved natural gas reservoirs should be returned to the reservoirs after the resources are recovered to prevent land subsidence. However, the ability to re-inject the brine gradually decreases and is only rectified by carrying out backwashing treatment of re-injection wells. Because the brine contains high levels of iodine also, it is also recovered from the brine using sulfuric acid and oxidizing agents. These chemicals may stimulate the growth of microorganisms that may cause the clogging. In this study, we used column experiments to investigate the possibility of the microbial clogging.Significant clogging was observed on the columns that were treated by the brine containing both indigenous microorganisms and dissolved oxygen. In particular, iodide-oxidizing bacteria were detected from the columns and original brine dominantly; therefore, it was assumed to have an important influence on the clogging. Iodine that was produced by iodide-oxidizing bacteria corroded iron in the sand under the presence of dissolved oxygen. Eluted Iron formed ferric hydroxide colloid in the brine and it caused the clogging of the pore spaces.We also demonstrated that deoxidized brine inhibited the iodide-oxidizing bacteria from becoming dominant and the column from the clogging through the column experiments. From these results, we can suggest removing dissolved oxygen as the most feasible countermeasures for the clogging.

本文言語英語
ページ(範囲)35-43
ページ数9
ジャーナルInternational Biodeterioration and Biodegradation
81
DOI
出版ステータス出版済み - 7 2013

All Science Journal Classification (ASJC) codes

  • 微生物学
  • 生体材料
  • 廃棄物管理と処理

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