Shim Young-Sook, Kim Young-Keun, Kong Sung-Ho, Rhee Seung-Whee, Lee Woo-Keun
Department of Environmental Engineering, Kangwon National University, Chuncheon, Kangwondo, 200-701 South Korea.
Waste Manag. 2003;23(9):851-7. doi: 10.1016/S0956-053X(02)00163-0.
The incineration rate of municipal solid waste (MSW) has been increased because of difficulty in securing a proper disposal site for MSW in Korea. The advantage of incineration is reduction of the volume of waste; however, significant amounts of bottom ash and fly ash were generated in the incineration process. Their treatment has attracted growing interest because of the potential toxicity of hazardous heavy metals. Generally, heavy metals are less released from bottom ash than from fly ash. In this study the adsorption characteristics of heavy metals were investigated using various particle sizes of MSWI bottom ash. Since bottom ash has a broad particle size distribution, it was sieved to size classes of +20, -20, -48, -80, -100 mesh. Cation exchange capacity (CEC) was analyzed by the ammonium acetate method to evaluate the potential as an adsorbent. The CEC values and surface areas increase as the range of particle size becomes finer. The adsorption experiment was conducted using synthetic (Cu and Ni) and plating rinse water as a function of reaction time (10-180 min), liquid/solid ratio (2-100) and particle size (+20 to -100 mesh), respectively. The adsorption rate increased with decreasing particle size and with increasing liquid/solid ratio; however, the removal efficiency of Cu was higher than that of Ni. In the case of plating rinse water, the adsorption rate decreased sharply at high liquid/solid ratio, and it showed over 80% of adsorption rates for Cu and Ni at an initial pH of 3.
由于在韩国难以确保有合适的城市固体废物（MSW）处置场地，城市固体废物的焚烧率有所提高。焚烧的优点是减少废物量；然而，在焚烧过程中会产生大量的底灰和飞灰。由于有害重金属的潜在毒性，它们的处理已引起越来越多的关注。一般来说，底灰中重金属的释放量比飞灰少。在本研究中，使用不同粒径的城市固体废弃物焚烧（MSWI）底灰研究了重金属的吸附特性。由于底灰的粒径分布很广，将其筛分为+20、-20、-48、-80、-100目等粒径等级。采用醋酸铵法分析阳离子交换容量（CEC），以评估其作为吸附剂的潜力。随着粒径范围变细，CEC值和表面积增加。分别使用合成物（铜和镍）和电镀漂洗水作为反应时间（10 - 180分钟）、液固比（2 - 100）和粒径（+20至-100目）的函数进行吸附实验。吸附速率随粒径减小和液固比增加而提高；然而，铜的去除效率高于镍。对于电镀漂洗水，在高液固比下吸附速率急剧下降，在初始pH值为3时，铜和镍的吸附率均超过80%。
