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Title
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Sulfur-based denitrification treating regeneration water from ion exchange at high performance and low cost
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Author
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Abstract
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| Autotrophic denitrification with sulfur is an underexplored alternative to heterotrophic denitrification to remove nitrate from wastewater poor in organics. The application on ion exchange regeneration water (19.432.1 mS cm−1) is novel. Three fixed bed reactors were tested at 15 °C for >4 months, inoculated with activated sludge from sewage treatment. All were fast in start-up (<10 days) with high performance (94 ± 2% removal efficiency). pH control with NaOH rendered higher nitrate removal rates than limestone addition to the bed (211 ± 13 vs. 102 ± 13 mg N L−1 d−1), related to higher pH (6.64 vs. 6.24) and sulfur surface area. Bacterial communities were strongly enriched in Sulfurimonas (6367%) and Thiobacillus (2426%). In an economic comparison, sulfur-based denitrification (5.3 kg−1 N) was 15% cheaper than methanol-based denitrification (6.22 kg−1 N) and both treatments were opex dominated (85.9 vs. 86.5%). Overall, the technological and economic feasibility should boost further implementation of sulfurotrophic denitrification. |
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Language
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English
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Source (journal)
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Bioresource technology. - Barking
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Publication
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Barking
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2018
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ISSN
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0960-8524
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DOI
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10.1016/J.BIORTECH.2018.02.047
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Volume/pages
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257
(2018)
, p. 266-273
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ISI
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000430401100033
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Pubmed ID
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29524912
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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