| dc.description.abstract | The production of sludge in thermal power plant has reached 1,900 tons per month. Since the landfill site is insufficient, the thermal power plant wastewater sludge must be incinerated and the ash must be recycled and reused. For this reason, this study investigated the feasibility of reusing wastewater sludge ash in construction materials to replace partial materials. Consequently, the properties of ash, mortar, concrete, aggregate and brick were analyzed. In this study, sludge sampled from different thermal power plant was burned into ash in the laboratory. According to the research results, the sludge has low heavy metal including Pb, Cd, Cr and Cu, so it belongs to general enterprise waste. Then the chemical composition of sludge was summed up in SiO2, Al2O3, Fe2O3 and CaO. The wastewater sludge ash is also found a porous material with irregular surface. When the ash was used to replace mortar cement, its water-adsorption capability will result in the reduction of mortar workability and compressive strength. Besides, the pH of sludge is between 7.15-9.90. Because different operating sequence and the source of wastewater will influence the properties of resource, we choose wastewater sludge of Lin-Kou thermal power plant to carry resource out follow-up.
The wastewater sludge ash of Lin-Kou thermal power plant can be reused to replace cement and aggregate respectively with sludge ash and artificial aggregate that is composed of ash and cement. On the other hand, the sludge ash is also reused to manufacture compressed concrete paving units. Cements or bricks are being substituted for sludge ash, and 10-20 percent of sludge ash is more appropriate. For fine aggregate, 50 percent of artificial fine aggregate is applicable to concrete. Sludge ash is reused to take the place of construction materials satisfy the requests of standard specification except higher absorbent of artificial fine aggregate and Cl- concentration. | en_US |