A bioreactor carrier is provided composed of a water absorption gel of a crosslinked N-vinylcarboxamide resin which has a great moisture content and excellent physical strength, is not eroded by microorganisms and is easily mass-produced on an industrial scale. The gel is obtained by swelling and gelling a crosslinked N-vinylcarboxamide resin made from an N-vinylcarboxamide such as N-vinylacetoamide. The swollen gel may be in the form of beads of 1.0 to 20 mm, and the resin when swollen with water has a water absorption coefficient of 500 to 3500%. Resin beads may be swollen in a suspension of a biocatalyst such as animal cells, plant cells, microorganisms or protozoans to bind and immobilize the biocatalyst to form a bioreactor. The microorganisms can be nitrate bacteria, denitrification bacteria or Hyphomycetes, and the bioreactor may be used to treat waste water or for deodorizing. The crosslinked N-vinylcarboxamide resin contains a repeating unit shown by formula (A) below crosslinked with a crosslinking agent. ##STR1## wherein R.sup.1 and R.sup.2 represent independently a hydrogen atom or a methyl group.

Um portador do bioreactor é fornecido compôs de um gel do absorption da água de uma resina crosslinked de N-vinylcarboxamide que tenha um índice de umidade grande e uma força física excelente, não é corroído por microorganisms e mass-produced fàcilmente em uma escala industrial. O gel é obtido inchando e gelling uma resina crosslinked de N-vinylcarboxamide feita de um N-vinylcarboxamide tal como N-vinylacetoamide. O gel inchado pode estar no formulário dos grânulos de 1.0 a 20 milímetros, e na resina quando inchado com água tem um coeficiente de absorption da água de 500 a 3500%. Os grânulos da resina podem ser inchados em uma suspensão de um biocatalyst tal como as pilhas animais, as pilhas da planta, os microorganisms ou os protozoans para ligar e immobilize o biocatalyst para dar forma a um bioreactor. Os microorganisms podem ser bactérias do nitrate, bactérias do denitrification ou Hyphomycetes, e o bioreactor pode ser usado tratar a água waste ou para deodorizing. A resina crosslinked de N-vinylcarboxamide contem uma unidade repetindo mostrada pela fórmula (A) crosslinked abaixo com um agente crosslinking. ## do ## STR1 wherein R.sup.1 e R.sup.2 representam independentemente um átomo do hidrogênio ou um methyl agrupe.

 
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