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首页> 外文期刊>International Journal of Environmental Research and Public Health >Leachability of Heavy Metals from Lightweight Aggregates Made with Sewage Sludge and Municipal Solid Waste Incineration Fly Ash
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Leachability of Heavy Metals from Lightweight Aggregates Made with Sewage Sludge and Municipal Solid Waste Incineration Fly Ash

机译：污泥和城市固体垃圾焚烧粉煤灰制成的轻质骨料对重金属的浸出能力

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摘要

Lightweight aggregate (LWA) production with sewage sludge and municipal solid waste incineration (MSWI) fly ash is an effective approach for waste disposal. This study investigated the stability of heavy metals in LWA made from sewage sludge and MSWI fly ash. Leaching tests were conducted to find out the effects of MSWI fly ash/sewage sludge (MSWI FA/SS) ratio, sintering temperature and sintering time. It was found that with the increase of MSWI FA/SS ratio, leaching rates of all heavy metals firstly decreased and then increased, indicating the optimal ratio of MSWI fly ash/sewage sludge was 2:8. With the increase of sintering temperature and sintering time, the heavy metal solidifying efficiencies were strongly enhanced by crystallization and chemical incorporations within the aluminosilicate or silicate frameworks during the sintering process. However, taking cost-savings and lower energy consumption into account, 1100 °C and 8 min were selected as the optimal parameters for LWA sample- containing sludge production. Furthermore, heavy metal leaching concentrations under these optimal LWA production parameters were found to be in the range of China’s regulatory requirements. It is concluded that heavy metals can be properly stabilized in LWA samples containing sludge and cannot be easily released into the environment again to cause secondary pollution.
机译：用污水污泥和城市固体废物焚烧（MSWI）粉煤灰生产轻质骨料（LWA）是有效的废物处理方法。这项研究调查了污水污泥和MSWI粉煤灰制得的LWA中重金属的稳定性。进行浸出试验以发现MSWI粉煤灰/污水污泥（MSWI FA / SS）比，烧结温度和烧结时间的影响。研究发现，随着MSWI FA / SS比值的增加，所有重金属的浸出率先降低后增加，说明MSWI粉煤灰/污水污泥的最佳比例为2：8。随着烧结温度和烧结时间的增加，通过在烧结过程中铝硅酸盐或硅酸盐骨架中的结晶和化学结合，重金属的固化效率大大提高。但是，考虑到节省成本和降低能耗的情况，选择1100°C和8分钟作为LWA含样品污泥生产的最佳参数。此外，发现在这些最佳LWA生产参数下的重金属浸出浓度在中国法规要求的范围内。结论是，重金属可以在含有污泥的LWA样品中适当地稳定，并且不容易再次释放到环境中以引起二次污染。

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