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

Table 2

Residual rates of HMs in the SR and WL after HTC process.

Samples	Percentage (%)
	Cr		Mn		Ni		Cu		Zn		As		Cd		Pb
	SR	WL	SR	WL	SR	WL	SR	WL	SR	WL	SR	WL	SR	WL	SR	WL
SR-220-1h	87.12	12.88	86.10	13.90	99.70	0.30	90.10	9.90	95.53	4.47	73.95	26.05	80.88	19.12	97.46	2.54
SR-220-2h	81.71	18.29	80.08	19.92	91.48	8.52	94.16	5.84	90.27	9.73	63.78	36.22	86.68	13.32	97.62	2.38
SR-220-3h	83.42	16.58	81.83	18.17	93.79	6.21	94.89	5.11	90.30	9.70	56.74	43.26	84.51	15.49	97.94	2.06
SR-250-1h	91.29	8.71	79.26	20.74	95.19	4.81	92.00	8.00	80.17	19.83	46.83	53.17	77.79	22.21	99.06	0.94
SR-280-1h	94.51	5.49	71.93	28.07	93.44	6.56	99.62	0.38	85.29	14.71	37.48	62.52	66.40	33.60	99.19	0.81