城市河涌受污染底泥的固化/稳定化处理

为了给河涌疏浚底泥的资源化提供技术支持,以广州市车陂涌表层受污染底泥为研究对象,用水泥、石灰、粉煤灰、膨润土等材料对底泥进行固化/稳定化处理实验。通过无侧限抗压强度、污染物在模拟自然条件下(中性)的释放特征、毒性浸出实验(酸性条件)对固化/稳定化处理效果进行综合分析。结果表明:经合适的处理后,固化体抗压强度能高于300 kPa;固化体自然条件下重金属的释放量明显减少,固化/稳定化处理能够有效减缓和减少固化体的二次污染;毒性浸出实验结果表明,河涌底泥经固化/稳定化处理后其重金属浸出能力显著降低。

Solidification/stabilization treatment of polluted sediments from urban river

In order to explore the feasibility of dredged sediment reutilization,lime,desulfurized fly ash,bentonite were used along with ordinary cement to solidify/stabilize the polluted sediment of Chebei river in Guangzhou,China.Unconfined compressive strength(UCS),pollutant release characteristics under natural conditions(neutral condition),and toxicity leaching test(acidic condition) of solidification/stabilization(S/S) treatments were evaluated to investigate S/S effectiveness.The results showed that most of S/S products were observed to be sufficient to achieve compressive strength of 300 kPa.The S/S products had a strong fixing capacity under natural conditions for pollutants,showing that S/S treatment could effectively decrease the secondary pollution of polluted sediment.The leaching test results showed that leaching ability of heavy metals in S/S products was significantly reduced.