Phosphorus recovery from secondary effluent and side-stream liquid in a sewage treatment plant using zirconium-loaded saponified orange waste |
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| Authors: | Seiichirou Ohura Hiroyuki Harada Biplob Kumar Biswas Mitsunori Kondo Susumu Ishikawa Hidetaka Kawakita Keisuke Ohto Katsutoshi Inoue |
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| Institution: | (1) Department of Applied Chemistry, Saga University, Honjo, Saga 840-8502, Japan;(2) Department of Environmental Sciences, Prefectural University of Hiroshima, Nanatsuka, Hiroshima 727-0023, Japan;(3) Department of Applied Chemistry and Chemical Engineering, Jessore Science and Technology University, Jessore, 7408, Bangladesh;(4) Research and Development Division/Research and Development Center, Maewawa Industries, Inc., Naka, Kawaguchi Saitama, 322-8556, Japan; |
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| Abstract: | Zirconium was loaded onto orange waste, a cheap and available agricultural waste in Japan, to investigate the feasibility
of its utilization for phosphorus recovery from secondary effluent and side-stream liquid, which contain 5.9 and 68.2 mg/dm3 phosphorus, respectively. The phosphorus removal from side-stream liquid by using zirconium-loaded saponified orange waste
(Zr-SOW) gel increased with an increasing solid/liquid ratio, and it was found that Zr-SOW gel showed better performance than
zirconium ferrite. The prepared adsorbent was effective for phosphorus removal and exhibited a reasonably high adsorption
capacity, twice than that of zirconium ferrite. The secondary effluent was treated in a column packed with Zr-SOW gel, and
an dynamic adsorption capacity of 1.3 mol-P/kg was attained. The adsorbed phosphorus from the column was successfully eluted
as a concentrated form by using a small amount of 0.2 M NaOH. Throughout the elution process, zirconium was not leaked from
the adsorption gel. |
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