氧化钙对污泥炭重金属稳定性及其吸附性能的影响

doi:10.19964/j.issn.1006-4990.2022-0453

Abstract

Abstract:

In view of the catalytic effect of CaO on gas production and tar reforming during biomass pyrolysis process，which can significantly improve the adsorption performance of biochar，the modified sludge derived biochar（BC-Ca） was prepared by co-pyrolysis of CaO and sewage sludge at a mass ratio of 1∶10.The effect of CaO on the characteristics of the sludge-derived biochar，as well as the speciation distribution of heavy metals（Pb，Zn，Cu，Cr，Mn） were investigated.The ecological risk of the biochar was assessed based on the risk assessment code（RAC）.The adsorption properties of the modified sludge derived biochar on Cr（Ⅵ） was evaluated by the static adsorption experiments.The results showed that compared with unmodified biochar（BC），the fraction of residual state（F4） of Zn，Pb，Cr，Mn，and Cu in BC-Ca were increased by 11.76%，13.03%，26.96%，5.55%，and 2.11%，respectively，which were all in a low risk condition according to the RAC standard.Compared with BC，the specific surface area of BC-Ca was increased by 122.99%，indicating that the microstructure performance of BC-Ca was improved.The adsorption behavior of BC-Ca for Cr（Ⅵ） was described by the Langmuir model and pseudo-second order dynamic sorption model，indicating that the adsorption capacity of BC-Ca was increased with increasing temperature，and the adsorption rate was mainly controlled by chemical adsorption mechanism.The maximum adsorption capacity of BC-Ca for Cr（Ⅵ） was improved by 51.13% than that of BC，showing outstanding removal effect on Cr（Ⅵ）.

Key words: sludge-derived biochar, heavy metal stability, ecological risk, Cr（Ⅵ） adsorption

CLC Number:

TQ132.32

TIAN Yuling, CHENG Yang, HAN Rong, ZHOU Mei, WANG Chengjie, GE Qiangru. Effect of CaO on heavy metals stability and adsorption properties of sludge-derived biochar[J]. Inorganic Chemicals Industry, 2023, 55(6): 124-129.

Figures/Tables 9

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References 21

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样品	Zn	Pb	Cr	Mn	Cu
BC	16.45%/MR	4.87%/LR	5.33%/LR	16.19%/MR	2.17%/LR
BC-Ca	7.01%/LR	2.90%/LR	8.36%/LR	15.41%MR	1.85%/LR

温度/ ℃	Langmuir方程				Fredundlich方程
温度/ ℃	Q_e/ （mg·g^-1）		K_L/ （L·g^-1）	R²	K_F	n	R²
15	24.59	0.740		0.942	11.873	4.403	0.894
25	24.71	0.855		0.972	12.366	4.546	0.912
35	24.84	1.107		0.974	13.056	4.780	0.932

拟一级反应				拟二级反应
Q_m/（mg·g^-1）	k₁/min^-1	R²		Q_m/（mg·g^-1）	k₂/（mg·min）^-1	R²
16.637	0.140	0.922		17.891	0.010	0.984

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Inorganic Acid-Base-Salt Committee of CIESC

Effect of CaO on heavy metals stability and adsorption properties of sludge-derived biochar

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