UV/H2O2 process performance improvement by ultrafiltration and physicochemical clarification systems for industrial effluent pretreatment

Melhora do desempenho do processo UV/H2O2 usando sistemas de ultrafiltração e de clarificação físico-química como pré-tratamento de efluente industrial

Abstracts

The present study evaluated the removal of TOC from an effluent with high organic load resulted from the treatment of oil-water emulsion by thermal process. Hollow Fiber Ultrafiltration membrane (HF-UF) and physicochemical clarification process were used as pretreatment options to assess the influence of feed effluent quality on the UV/H2O2 oxidation process. Results for TOC removals showed HF-UF and physicochemical clarification processes can significantly improve the efficiency of UV/H2O2 oxidation process, when compared with the direct effluent oxidation. Reaction time for obtaining a TOC removal higher than 90% was reduced to approximately half of the time needed when no pretreatment was applied. Considering both pretreatment processes it was not possible to notice any significant difference on the UV/H2O2 oxidation process performance. However, the complexity of physicochemical process due to the use of three different chemicals and sludge production made the HF-UF process the best pretreatment alternative, without increasing the Total Dissolved Solids of the effluent, a very important issue when water reuse is considered.

UV/H2O2; ultrafiltration; physicochemical process

O presente trabalho teve por objetivo avaliar a remoção de COT de um efluente com elevada concentração de matéria orgânica proveniente do tratamento de emulsão (água/óleo) por processo térmico. Um processo de separação por membranas de fibra-oca e outro de clarificação físico-químico foram usados como opções de pré-tratamento para avaliar a influência da qualidade do efluente sobre o processo de oxidação UV/H2O2. Os resultados de remoção de COT demonstraram que tanto o processo de membranas quanto o físico-químico podem melhorar significativamente a eficiência do processo de oxidação UV/H2O2. O tempo de reação necessário para uma remoção de 90% de COT foi reduzido pela metade quando comprado com a oxidação direta do efluente. Considerando ambos os processos de pré-tratamento não foi possível observar nenhuma diferença significativa sobre o desempenho do processo de oxidação UV/H2O2. Entretanto, a complexidade do processo físico-químico devido ao uso de três diferentes compostos e a produção de lodo faz do sistema de membranas a melhor alternativa de pré-tratamento.

UV/H2O2; ultrafiltração; processo físico-químico

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Publication Dates

• Publication in this collection
  16 Sept 2014
• Date of issue
  Dec 2012