Domestic wastewater treatment – septic tank: Sludge separation, storage capacity (NT VVS 075) Posted onMay 21, 1989September 21, 2020Author Report #: NT VVS 075 Approved: May 1989 Download pdf Size: 69.05 KB Abstract This NORDTEST-method describes tests of sludge separation and sludge storage capacity for septic tanks for private domestic sewer systems. Categories and tags