The Migration and Transformation of Heavy Metals in Sewage Sludge during Hydrothermal Carbonization Combined with Combustion

Table 5

Residual rates of HMs in the combustion residual (%).

Samples	Cr	Mn	Ni	Cu	Zn	As	Cd	Pb
Raw SS	87.36	74.97	90.69	72.16	88.47	85.09	91.72	75.31
SS-220-1h	90.15	84.84	91.70	79.13	86.65	87.57	91.87	79.59
SS-220-2h	91.12	92.29	92.39	80.07	88.60	85.02	92.23	80.96
SS-220-3h	90.09	92.78	92.95	79.26	90.12	88.22	91.13	81.13
SS-250-1h	92.53	84.80	95.95	75.14	90.31	91.50	92.08	76.81
SS-280-1h	93.88	88.46	93.28	78.51	92.03	92.86	92.61	72.23