Dairy wastewater polluting load and treatment performances of an industrial three-cascade-reactor plant |
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Authors: | Carlo Tocchi Ermanno Federici Silvia Scargetta Alessandro D’Annibale Maurizio Petruccioli |
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Affiliation: | 1. Department for Innovation in Biological, Agro-Food and Forest Systems (DIBAF), University of Tuscia, Via San Camillo De Lellis s.n.c., 01100 Viterbo, Italy;2. Manzi Aurelio s.r.l., Via Cassia Km 94.100, 01027 Montefiascone, VT, Italy;3. Department of Cellular and Environmental Biology, University of Perugia, Via del Giochetto, 06122 Perugia, Italy |
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Abstract: | An industrial three-cascade-reactor plant treating 45 m3 d?1 of dairy wastewater (DW) was monitored for approx. one year to investigate the effect of variable daily influent loads. It removed more than 85% COD, NH4-N and non-ionic and anionic surfactants from DW within the loads 7–24, 0.4–2.3, 0.4–0.7 and 0.1–0.5 kg d?1, respectively; NH4-N removal, in particular, was almost quantitative. Although the degradation of the above parameters below the lower load thresholds declined to 78.7, 87.5, 50.2 and 64.7%, respectively, their residual concentrations met effluent discharge standards. The biomass settling properties, assessed as sludge volume index (SVI), were satisfactory (generally lower than 150 ml g?1) regardless of the organic load of the influent. The depletion of the pollutant load took mainly place in the first reactor albeit a significant contribution to the removal of the slowly degradable organic matter fraction was given by the two subsequent reactors. |
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Keywords: | Dairy wastewater Industrial three-cascade-reactor plant Treatment performance Influent load impact Non-ionic and anionic surfactants |
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