Arsenic removal from arsenic-contaminated water by biological arsenite oxidation and chemical ferrous iron oxidation using a down-flow hanging sponge reactor | Zendy

Nao ISHIKAWA | Zendy; Nami Segawa | Zendy; Daisuke Yamazaki | Zendy; Ayumi Ito | Zendy; Teruyuki Umita | Zendy

Open Access

Arsenic removal from arsenic-contaminated water by biological arsenite oxidation and chemical ferrous iron oxidation using a down-flow hanging sponge reactor

Author(s) -

Nao ISHIKAWA,

Nami Segawa,

Daisuke Yamazaki,

Ayumi Ito,

Teruyuki Umita

Publication year - 2017

Publication title -

water science and technology water supply

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.318

H-Index - 39

eISSN - 1607-0798

pISSN - 1606-9749

DOI - 10.2166/ws.2017.025

Subject(s) - arsenite , arsenic , oxidizing agent , ferrous , hydroxide , chemistry , water treatment , environmental chemistry , contamination , iron bacteria , sponge , nuclear chemistry , direct reduced iron , inorganic chemistry , environmental engineering , environmental science , bacteria , ecology , organic chemistry , biology , genetics , botany

The down-flow hanging sponge (DHS) reactor was used for continuous As removal treatment of As-contaminated water. The treatment scheme was: (1) As(III) in contaminated water is oxidized by arsenite-oxidizing bacteria fixed in the sponges in the reactor; (2) Fe(II) naturally existing in the water is oxidized by dissolved oxygen; (3) Fe(III) is precipitated as iron hydroxide and As(V) is co-precipitated with the iron hydroxide; and finally (4) the co-precipitates are fixed in the sponges. This system could remove As from As-contaminated water on a small scale and at low cost. The results showed that, after using the DHS reactor, As and Fe concentrations in the treated water were lower than water quality standards for drinking water when Fe(II) concentration in the influent was lower than 10 mg/L and the Fe/As ratio was higher than 6.67–8.42, with dependence on the Fe concentration. Additionally, even if Fe concentration is higher than 10 mg/L, the treatment system is still applicable if the pH of the influent is higher than 7 or the retention time is longer than 2 h.

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