ABSTRACT This study was performed to reuse of dyeing wastewater sludge treated by Fenton process through the solidification/stabilization technique. To solidify the dyeing sludge the industrial by-products such as blast furnace slag, fly ash and waste sand with cement were used. The laboratory scale and pilot scale test were conducted at room temperature to make construction brick which has high compressive strength and low leaching of heavy metals. The experimental results showed that blast furnace slag and fly ash could be used instead of cement and the final products satisfied the brick regulation of Korean Standard. The blast furnace slag increased the compressive strength and the optimum ratio of slag/dry sludge on dry basis was found 0.4. The solidifying agent of SB series could increase rapidly the compressive strength and the optimum ratio of solidifying agent/dry sludge on dry basis was 0.26 at which the strength was two times compared with non-added condition. The portion of waste and industrial by-products in matrix was over 80%. From the pilot test the optimum pressure in molding was 100 kgf at which the compressive strength was over 100 kg/cm2. And the compressive strength increased continuously to 160 kg/cm2 until 120 days curing time due to pozzolanic reaction. When SB-20 as a solidifying agent was used, the unconfined compressive strength of dyeing sludge could be obtained 110 kg/cm2which satisfied the regulation of cement brick in Korea Standard (KS).