Impact of ferrous iron dosing on iron and phosphorus solids speciation and transformation in a pilot scale membrane bioreactor

Wu, H.*; Wang, Y.*; Ikeda, Atsushi; Miller, C. J.*; Waite, T. D.*

Environmental Science; Water Research & Technology, 5(8), p.1400 - 1411, 2019/08

AA2019-0201.pdf:0.72MB

https://doi.org/10.1039/C9EW00225A

In this study, the distributions of iron and phosphorus species in a 1.25 m pilot scale submerged membrane bioreactor dosed with Fe(II) salts to either the membrane chamber or the 1st anoxic chamber were determined using X-ray absorption spectroscopy (XAS) at the iron and phosphorus K-edges. Significant differences in the distribution of Fe species were evident at the commencement of dosing depending on the chamber to which Fe(II) was dosed though these differences were much less distinct by the time steady state conditions were achieved. Both the co-precipitation of P with Fe and adsorption of phosphorus to iron oxides play important roles with regard to the removal of phosphorus from the MBR supernatant with the results of this work suggesting that P removal via formation of Fe(III)-phosphate mineral species is preferred if Fe(II) is dosed to the membrane chamber rather than the 1st anoxic chamber.

Investigation of treatment technologies of fluorine and boron removal from groundwater at Mizunami Underground Research Laboratory

Iyatomi, Yosuke; Mikake, Shinichiro; Matsui, Hiroya

no journal, , 

no abstracts in English

液液抽出に基づく特定物質の抽出回収方法

長縄 弘親; 永野 哲志

not registered

JP, 2023-201835  Patent licensing information

【課題】重液相内若しくは軽液相内又は両相内に含まれる特定物質を簡単な方法で効率良く抽出回収する方法を提供すること。 【解決手段】機械撹拌を利用する液液抽出において、翼部位が重液相と軽液相の間の界面近傍に配置された攪拌翼を回転させながら、容器の上方から重液相を下方から軽液相を送液導入し、乳濁混合状態と相分離状態の領域を形成させ、相分離した液相を他の容器の逆抽出液内に導入し、特定物質を抽出回収する。