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Os trabalhos de tratamento em Surrey confiam na BOLLFILTER para proteger a central NSAF. O filtro funciona continuamente com um ciclo de lavagem por retorno automático, elimina a necessidade de limpeza manual e evita o tempo de inatividade da central.
As células NSAF contêm biomassa com micróbios que, quando são bombeados com oxigênio, se alimentam de amoníaco e outros contaminantes para purificar a água. A montagem do BOLLFILTER, que inclui um filtro automático com limpeza automática aliado a um filtro manual na tubulação de derivação, foi concebida para proteger a pequena tubagem na central NSAF contra risco de danos ou bloqueios de partículas.
Os filtros automáticos BOLLFILTER foram instalados na central de tratamento de águas residuais em Beckton.
O processo de tratamento de águas residuais possui oito filtros de grandes dimensões que podem funcionar continuamente para remover resíduos das águas residuais. Após o tratamento primário e secundário, a água de lavagem é enviada para os filtros através de uma série de bocais para lavar o lodo e limpar os filtros e as escovas. Para evitar que os bocais da água de lavagem bloqueiem e perturbem o processo de separação de resíduos, os filtros automáticos da BOLLFILTER são aplicados na entrada de água de lavagem antes das bombas, com o benefício adicional de proteger estas últimas de possíveis danos provocados por partículas. Uma pequena quantidade de água de lavagem pressurizada é enviada de volta para os filtros, para uma limpeza eficiente sem a necessidade de bombas de lavagem por retorno separadas, criando uma solução filtro/bomba de baixa energia e com um aproveitamento de espaço eficiente