TY JOUR TI DEEP EXTRACTION OF CHROMIUM IONS FROM SEWAGE WHEN USING IRON CHIPS AND ABSORBENT CARBON AT TRACTOR AND AGRICULTURAL MECHANICAL ENGINEERING ENTERPRISES KW sewage KW activated carbon KW Fe-chips KW chromium ions JO Bulletin of KSAU AU Khalturina, T.I. AU Churbakova, O.V. AU Sysoeva, E.A. AU Bogatyryova, A.V. PY 2017 IS PB Krasnoyarsk State Agrarian University