Anaerobic, aerobic and anoxic treatment of dairy cattle wastewater
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Data
2019-05-09
Autores
Maldonado, Alexandra Elizabeth Moya
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A digestão anaeróbia é uma alternativa de baixo custo para o tratamento de águas residuárias de bovinocultura de leite. Neste estudo utilizou-se um sistema de tratamento, em escala piloto, composto primeiramente por um reator anaeróbio compartimentado (ABR) com duas câmaras (ABRc1 e ABRc2 com 451,9 L), seguido de um filtro aerado submerso (SAF de 160 L) e um reator de fluxo ascendente com manta de lodo anóxico (USBnox de 120 L) finalizando o tratamento de efluentes da bovinocultura leitera.O estudo foi dividido em três fases onde o sistema foi operado sob diferentes condições: TDH de 93,7 h e COV de 8,0 g DQOtotal/(L•d) no ABR na fase I. Na fase II foi incluído o pós-tratamento (SAF + USBnox), o TDH aplicado no sistema foi de 121,6 e 91,3 h com COV de 15 e 23 gDQOtotal/(L•d) na fase II e III, respectivamente. Nas três fases, o ABR demonstrou condições de estabilidade e na fase I obteve maiores remoções de DQO, N e P com TDH de 93.7 h. O sistema de tratamento (ABR-SAF-USBnox) obteve maior remoção de DQO, nitrogênio e fósforo na fase II, média de 81, 68 e 68%, respectivamente. As maiores remoções de nutrientes (Fe, Na, K, Ca, Mg, Zn, Cu, Mn) ocorreram na fase II, utilizando o pós-tratamento (SAF + USBnox). O sistema anaeróbico, aeróbio e anóxico apresentou uma estratégia eficaz para o tratamento de águas residuárias de bovinocultura de leite com alta concentração de matéria orgânica, nitrogênio, fósforo e micronutrientes, obtendo altas eficiências de remoção.
Anaerobic digestion is a low-cost alternative for the treatment of wastewater from dairy cattle. In this study, a pilot scale treatment system was used; consisting of a two-chamber compartmentalized anaerobic reactor (ABRc1 and ABRc2 with 451.9 L), a submerged aerated filter (SAF of 160 L) and an anoxic upflow sludge blanket (USBnox of 120 L) for dairy cattle wastewater treatment. The study was divided into three phases where the anaerobic system was operated under TDH of 93.7 and OLR of 8.0 g CODtotal/(L•d) in phase I. Phase II and phase III included post-treatment (SAF + USBnox) and the HRT applied was 121.6 h and 91.3 h with OLR of 15 and 23 g CODtotal/(L•d), respectively. In the three phases, the ABR demonstrated stability conditions and in Phase I, it obtained greater removals of COD, N and P with HRT of 93.7 h. The treatment system (ABR + SAF + USBnox) obtained higher removal of COD, nitrogen and phosphorus in phase II, with a mean of 81, 68 and 68%, respectively. The highest removals of micronutrients (Fe, Na, K, Ca, Mn, Zn, Cu, Mg) occurred in phase II, using post-treatment (SAF + USBnox). The anaerobic, aerobic and anoxic system presented a versatile strategy for the treatment of dairy cattle wastewater with high concentration of organic matter, nitrogen, phosphorus and micronutrients, obtaining high removal efficiencies.
Anaerobic digestion is a low-cost alternative for the treatment of wastewater from dairy cattle. In this study, a pilot scale treatment system was used; consisting of a two-chamber compartmentalized anaerobic reactor (ABRc1 and ABRc2 with 451.9 L), a submerged aerated filter (SAF of 160 L) and an anoxic upflow sludge blanket (USBnox of 120 L) for dairy cattle wastewater treatment. The study was divided into three phases where the anaerobic system was operated under TDH of 93.7 and OLR of 8.0 g CODtotal/(L•d) in phase I. Phase II and phase III included post-treatment (SAF + USBnox) and the HRT applied was 121.6 h and 91.3 h with OLR of 15 and 23 g CODtotal/(L•d), respectively. In the three phases, the ABR demonstrated stability conditions and in Phase I, it obtained greater removals of COD, N and P with HRT of 93.7 h. The treatment system (ABR + SAF + USBnox) obtained higher removal of COD, nitrogen and phosphorus in phase II, with a mean of 81, 68 and 68%, respectively. The highest removals of micronutrients (Fe, Na, K, Ca, Mn, Zn, Cu, Mg) occurred in phase II, using post-treatment (SAF + USBnox). The anaerobic, aerobic and anoxic system presented a versatile strategy for the treatment of dairy cattle wastewater with high concentration of organic matter, nitrogen, phosphorus and micronutrients, obtaining high removal efficiencies.
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Palavras-chave
Digestão anaeróbia, Águas residuárias de bovinocultura leiteira, Remoção biológica de nutrientes, Pós-tratamento aeróbio/anóxico, Carga orgânica volumétrica, Anaerobic digestion, Dairy cattle wastewater, Biological nutrient removal, Aerobic/anoxic post-treatment, Organic loading rate