  We investigate the consequences of acceleration of nuclei in jets of active
galaxies not far from the surface of an accretion disk. The nuclei can be
accelerated in the re-connection regions in the jet and/or at the jet boundary,
between the relativistic jet and its cocoon. It is shown that the relativistic
nuclei can efficiently fragment onto specific nucleons in collisions with the
disk radiation. Neutrons, directed towards the accretion disk, take a
significant part of energy from the relativistic nuclei. These neutrons develop
a cascade in the dense accretion disk. We calculate the neutrino spectra
produced in such hadronic cascade within the accretion disk. We propose that
the neutrinos produced in such scenario from the whole population of
super-massive black holes in active galaxies can explain the extragalactic
neutrino background recently measured by the IceCube neutrino detector,
provided that $5\%$ fraction of galaxies is AGN and a few percent of neutrons
reach the accretion disk. It is predicted that the neutrino signals in the
present neutrino detectors, produced in terms of such a model, are not expected
to be detectable even from the nearby radio galaxies similar to M87.
