No abstract

During the oil production process, oily waste water is coproduced at a rate several times that of oil. This water is known as produced water. Treatment levels and technologies are selected based on disposal method or reutilization objectives, environmental impacts, economics, and other such factors. For the treatment of produced water, the treatment system equipped with nitrogen microbubble otation in conjunction with anthracite ltration and activated carbon adsorption was designed and examined.Polymer ooding is being used as an enhanced oil recovery (EOR) method in Oman. The quality of polymer ood produced water (PFPW) is different from produced water (PW) without polymer, it was clari ed that aluminum sulfate (AS) is more effective than poly-aluminum chloride (PAC) as a occulant. Based on the examination results, a 50 m 3 / day capacity pilot plant was designed, fabricated, and utilized to conduct produced water treatment trials, good oil removal was con rmed in all tests.It was also con rmed that this accompanied water treatment water could be used as irrigation water for agriculture by performing necessary higher order treatment. As a result, it was considered that the development as a new water source in the Middle East, where water resources are scarce, could be expected.Keywords： oil eld produced water, enhanced oil recovery, coagulation, polymer ood, produced water, polyaluminum chloride, aluminum sulfate, oil removal, microbubble, otation, ltration ＊ 令和 2 年 10 月 28 日 令和 2 年度石油技術協会学術大会開発・生 産部門シンポジウム「石油増進回収(EOR)の未来-多様性と持 続性，実証ステージへの展開-」で講演 This paper was presented at the 2020 JAPT Development and Production Technology Symposium entitled "The Future of Enhanced Oil Recovery (EOR) -Development to the demonstration of diversity and sustainable EOR techniques" held in

Organic sludge has recently attracted attention as a renewable energy source. While the organic matter contained in sludge can be utilized as various renewable energy sources, its nitrogen component has limited use. In this study, subcritical water treatment was conducted to recover ammonia from digested sludge. While ammonia recovered via stripping is limited to soluble components, subcritical water treatment can convert solid components and dissolved organic nitrogen sludge into ammonia. Digested sludge was treated at several reaction temperatures, reaction pressures, treatment times, and oxygen ratios to determine the ammonia generation rate. Among the conditions tested in this study, an ammonium generation rate of 84.0% was obtained at 400 °C, 10 MPa, a treatment time of 5 min, and at an oxygen ratio of 1.2.