Wang Xing-dong, Lin Jing-jiang, Li Zhi-wei, Chao Huan-ping, Yu Guang-wei, Wang Yin
Huan Jing Ke Xue. 2016 Mar 15;37(3):1048-54.
Hydrothermal treatment (HTT) of sewage sludge was conducted, focusing on the influence of HTT time on the dewaterability of sludge and transformations of elements N, P, K and heavy metals. The results showed that at a hydrotherma temperature of 160°C, with HTT time increasing from 30 to 120 min, the sludge dewatering performance was significantly improved. The transfer rate of N element in the sludge transferring to aqueous product increased gradually. Almost all of P element remained in the solid phase, and most of K element (57%-62%) was still in the solid phase although it was more easily transferred to the liquid phase than P element. The transferring behavior of heavy metals during the HTT related to their own properties, and their transferring behaviors were different with the increase of HTT time. Compared with the raw sludge, the contents of Cu, Zn, Cr and Pb in the dewatered sludge increased significantly, As increased slowly, while Ni and Cd were first lower than those in raw sludge, and then increased with the prolonging HTT time.
对污水污泥进行了水热处理（HTT），重点研究了水热处理时间对污泥脱水性能以及氮、磷、钾元素和重金属转化的影响。结果表明，在水热温度为160℃时，随着水热处理时间从30分钟增加到120分钟，污泥脱水性能显著提高。污泥中氮元素向水相产物转移的比例逐渐增加。几乎所有的磷元素都留在固相，大部分钾元素（57%-62%）仍在固相，尽管它比磷元素更容易转移到液相。水热处理过程中重金属的转移行为与其自身性质有关，且随着水热处理时间的增加其转移行为有所不同。与原污泥相比，脱水污泥中铜、锌、铬和铅的含量显著增加，砷含量缓慢增加，而镍和镉最初低于原污泥中的含量，随后随着水热处理时间的延长而增加。
