| Summary: | 碩士 === 逢甲大學 === 環境工程與科學學系 === 106 === In Taiwan, the disposal of inorganic sludge encounters many problems in recent years. If the inorganic sludge can be reused for the fabrication of brick successfully, the pressure of sludge disposal will be reduced. However, the current domestic general and case reuse permits for the fabrication of bricks by reusing inorganic sludge are only limited to the desulfurization sludge and water-purification sludge. There is no successful application achievement that reused industrial wastewater inorganic sludge for the fabrication of bricks. Therefore, this study investigated the feasibility of reusing industrial wastewater inorganic sludge for the fabrication of bricks and found the optimum operation conditions. The tests in the actual large-scale brick factory were also conducted. The results can provide useful information for the future technological development of reusing inorganic sludge from the industrial wastewater plants.
Experimental results showed that the major components of the industrial wastewater inorganic sludge were SiO2, CaO, Fe2O3, and Al2O3, which were similar to the clay components and both of them contained the flux constituents. Therefore, the industrial wastewater inorganic sludge can be reused as the alternatives to the clay for brick fabrication. In addition, the Toxicity Characteristic Leaching Procedure test results of the industrial wastewater inorganic sludge were all lower than the regulatory limits. They were judged as the general waste and can be reused without any hazard concerns. The results of simulated brick fabrication in the laboratory indicated that the optimal operation conditions for the fabrication of bricks from the industrial wastewater inorganic sludge were obtained as the sludge blending ratio was 5%, the sintering temperature was 1,000℃, the sintering time was 90min, and the molding pressure was 200kgf/cm2. The influence of different sintering parameters on the brick quality followed the sequence of sludge ratio> sintering temperature> molding pressure> sintering time. The results of SEM analysis showed that the adhesion between the particles of bricks were enhanced and the brick surface became more dense as the sintering temperature increased. As the ratio of sludge increased, the structure and pores of the bricks became looser. The test results in an actual large-scale brick factory showed that the water absorption rate of bricks was 14.69% and the compressive strength can reach 210kgf/cm2, which can meet the quantity standards for grade III bricks in CNS 382 R2002. The quality of fabricated bricks with 10% industrial wastewater sludge were similar to the common bricks used in general construction. Therefore, it is feasible to reuse the industrial wastewater inorganic sludge for the fabrication of bricks.
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