High rate sulfate reduction at pH 6 in a Ph-auxostat submerged membrane bioreactor fed with formate
Many industrial waste and process waters contain high concentrations of sulfate, which can be removed by sulfate-reducing bacteria (SRB). This paper reports on mesophilic (30 °C) sulfate reduction at pH 6 with formate as electron donor in a membrane bioreactor with a pH-auxostat dosing system. A mixed microbial community from full-scale industrial wastewater treatment bioreactors operated at pH 7 was used as inoculum. The pH-auxostat enabled the bacteria to convert sulfate at a volumetric activity of 302 mmol sulfate reduced per liter per day and a specific activity of 110 mmol sulfate reduced per gram volatile suspended solids per day. Biomass grew in 15 days from 0.2 to 4 g volatile suspended solids per liter. This study shows that it is possible to reduce sulfate at pH 6 with formate as electron donor at a high volumetric and specific activity with inocula from full-scale industrial wastewater treatment bioreactors operated at neutral pH. The combination of a membrane bioreactor and a pH-auxostat is a useful research tool to study processes with unknown growth rates at maximum activities.
| Main Authors: | , , , |
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| Format: | Article/Letter to editor biblioteca |
| Language: | English |
| Subjects: | bioreactors, carbon-dioxide, conversion, filtration, gas-lift reactor, growth, hydrogen-sulfide, industrial wastes, membranes, methanogenesis, reducing bacteria, removal, sludge, sulfate reducing bacteria, sulfate reduction, waste water treatment, water, afvalwaterbehandeling, bioreactoren, filtratie, industrieel afval, membranen, sulfaat reducerende bacteriën, sulfaatreductie, |
| Online Access: | https://research.wur.nl/en/publications/high-rate-sulfate-reduction-at-ph-6-in-a-ph-auxostat-submerged-me |
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