Tratamento anaeróbio-aeróbio de águas residuárias do processamento de cafeeiro em reatores biológicos
Coffee processing wastewater (CPWW) is an important organic waste with high pollution potential. Anaerobic digestion in two-stages combined with post-treatment with aerobic phase, can enable the production of by-products with added value. In this study we evaluated the combination of two-stage UASB...
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| Tipo de documento: | dissertação |
| Estado: | Versão publicada |
| Data de publicação: | 2014 |
| País: | Brasil |
| Recursos: | Universidade Estadual Paulista (UNESP) |
| Repositório: | Repositório Institucional da UNESP |
| Idioma: | português |
| OAI Identifier: | oai:repositorio.unesp.br:11449/127571 |
| Acesso em linha: | http://hdl.handle.net/11449/127571 http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/20-08-2015/000845444.pdf |
| Access Level: | Acceso aberto |
| Palavra-chave: | Café Reatores UASB Residuos agricolas Resíduos industriais Agua - Reutilização Águas residuais - Purificação Waste products |
| Resumo: | Coffee processing wastewater (CPWW) is an important organic waste with high pollution potential. Anaerobic digestion in two-stages combined with post-treatment with aerobic phase, can enable the production of by-products with added value. In this study we evaluated the combination of two-stage UASB reactors (R1 and R2) followed by Sequencial Batch Reactor (SBR), for the stabilized effluent and methane production, with and without phosphorus supplementation. We applied gradual increase of organic loading rate (OLR) from 0,5 to 6 g CODtotal (L d)-1, with hydraulic retention times (HRT) of 60, 30 and 24 h in R1, R2 and SBR, respectively. The affluent COD was increased from 6974 to 14939 mg L-1 O2, thus decreased of removals from 87% to 80%, while phosphorus supplementation had no significant effect on the organic matter removal. Although, the nutritional correction improved effluent quality, increasing the phenol removal efficiencies from 70% to 94% with phosphorus addition, however did not induce differences in the biogas production. The highest methane production occurred in R1 and were 0,29 and 0,74 L CH4 (L d)-1 in the different tests. Additionally, the anaerobic - aerobic system removed from 40% to 71% of the total Kjeldahl nitrogen (TKN) and total phosphorus (TP) without affluent nutritional correction, and from 41 to 81% of TKN and TP when the affluent was corrected. Similarly, obtained inorganic elements removal such as Fe, Zn, Cu, Mn, Mg, Ca and K, especially during anaerobic digestion. The R2 showed low performance both for the production of bioenergy as to improve the quality of the effluent, although helped to stabilize the load shocks and toxic compounds such as phenols before changes in physical and chemical characteristics of CPWW. In the RBS were observed nitrification and biological phosphorus removal phenomena, although it decreased the aerobic reaction time and will add one anoxic reaction cycle. UASB system showed an ... |
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