Vyčistená voda však môže aj recirkulovať kvôli zriedeniu koncentrovaných odpadových vôd alebo kvôli preplachu náplne kolóny.
Zvláštnym druhom biologických kolón sú rotačné diskové reaktory. V nich je biofilm kultivovaný na pomaly sa otáčajúcich zvislo postavených diskoch, ktoré sú čiastočne ponorené do čistenej odpadovej vody. Rotácia disku zabezpečuje striedavý kontakt biofilmu s odpadovou vodou a vzduchom. Konštrukčne sú riešené ako horizontálne pretekaný žľab s plastovými kotúčami. Priemer kotúčov býva 0,5 m až 3,5 m. Biologické kolóny majú tieto výhody :
• nižšia spotreba energie v porovnaní s aktivačným procesom,
• vyššia odolnosť biofilmových reaktorov voči tvorbe vlákien mikroorganizmov, kedy sa separačné schopnosti suspenznej kultúry zhoršujú v dôsledku rozvoja vláknitých mikroorganizmov.

Nazov: životopis
Autor: Tippy Hedren
Oblast: 15
--------------------

Actress. Born in New Ulm, Minnesota. Hedren was acting in a commercial during the Today show in 1952 when Alfred Hitchcock “discovered” her. He placed her in a starring role in his film classic The Birds (1963), then in Marnie (1964) with Sean Connery, and she developed the screen persona of an icy, sophisticated, but vulnerable blonde beauty. She next appeared in Charlie Chaplin’s final film The Countess from Hong Kong with Marlon Brando and Sophia Loren, but it was a flop, and her film career ultimately did not live up to its early promise.

During filming in Africa of Satan’s Harvest in 1969, Hedren became interested in the plight of wildlife. Since then she has devoted much of her life to the creation and funding of wildlife preservation groups. She is founder and director of The Shambala Preserve and The Roar Foundation, named after her 1981 film Roar which featured a performance by daughter Melanie Griffith, and was directed by her second husband, director Noel Marshall. She teamed up with Melanie again in 1990’s Pacific Heights.

Hedren has been married three times. With her first husband, Peter Griffith, she had Melanie, born in 1957. She was married to Noel Marshall from 1964 to 1982, and married her current husband, Luis Barrenecha, in 1985. Hedren resides in the Shambala complex near Acton, CA.