Porous and ceramic materials were produced from industrial waste – glass as by-products from glass fibre production and sewage sludge, and mineral raw material – clay from the deposit Nicgale. The chemical and mineralogical analysis of sewage sludge was performed. Sewage sludge contains material “Organiosorb” (bentonite), 50% of organic matter, phosphorous, nitrogen and some trace elements: Cr, Zn, Cd, Ni, Pb, Cu. The waste glass contains mainly SiO2, Al2O3, CaO, B2O3, MgO, K2O, TiO2 and Fe2O3. The mineral raw material - Latvian clay from deposit Nicgale contains mainly SiO2, Al2O3, CaO, Fe2O3, K2O, MgO, TiO2, Na2O and SO3 and particularly high content of carbonate compounds - 21,66 wt% CaCO3+MgCO3. The mentioned clay could be used as a raw material for porous ceramic composite due to the high content (73.3%) of particles having size < 5 μm. The raw materials were investigated by differential-thermal analysis (DTA) as well as thermal treatment. According to the studies of the composition of raw materials several mixtures were produced from the clay (45 – 55 wt%) as a matrix material and sewage sludge (25 – 35 wt%) as well as waste glass (20 wt%) in order to manufacture a lightweight aggregate during the thermal treatment. The conditions of sintering of porous ceramic were established after various experiments: heating rate until 700oC – 3o/min and subsequent heating until maximum temperature with heating rate 12o/min. Three compositions showing optimal Functional properties: thermal shrinkage – 0.5 - 7%, bulk density 1.5 – 2,1 g/cm3 at the temperature interval 1120 – 1130oC, porosity - 34 – 48%, and relatively high breaking stress in compression – 51.1±1.1 – 51.5±1.0 MPa. According to the functional properties detected, the obtained materials could be used as fillers for building materials and porous building ceramic materials for specific purposes (e.g. thermoinsulation).