Analysis of Physical and Chemical Properties of Sludge-based Biochar at Different Pyrolysis Temperatures

doi:10.11924/j.issn.1000-6850.casb2020-0157

Abstract

Abstract:

To study the effect of pyrolysis temperature on the basic physical and chemical properties of sludge-based biochar, so as to provide a theoretical basis for the safe, reasonable and efficient disposal of sludge, dried sludge was pyrolyzed at 200, 300, 500 and 700 ℃ (SBC200、SBC300、SBC500、SBC700), respectively, and the basic physical and chemical properties of sludge-based biochar were determined. The results showed that the surface particle structure of the biochar prepared at different temperatures was not damaged. The pore size was in the range of 10-50 μm. The surface of SBC200 was smooth, the most probable pore size and the median pore size were the largest, which were 20.1 μm and 14.8 μm, respectively. The surface of the SBC700 was rough, with the largest specific surface area of 5.98 m²/g. With the increase of pyrolysis temperature, the yield, water content, conductivity, volatile matter and cation exchange capacity of sludge-based biochar decreased significantly. The total carbon, oxygen, total nitrogen, hydrogen content, available phosphorus and ammonium nitrogen decreased gradually. The pH and ash content of sludge-based biochar increased significantly with the increase of pyrolysis temperature. The preparation of biochar is an effective way to dispose sludge safely. The sludge-based biochar prepared at low temperature has great potential to improve soil fertility, while the biochar prepared at high temperature has great potential to improve the pH of acid soil.

Key words: sludge, biochar, pyrolysis, physical and chemical properties, temperature, soil, improvement

CLC Number:

S156.2

Ma Tao. Analysis of Physical and Chemical Properties of Sludge-based Biochar at Different Pyrolysis Temperatures[J]. Chinese Agricultural Science Bulletin, 2020, 36(35): 134-138.

Figures/Tables 5

References 27

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指标	SBC200	SBC300	SBC500	SBC700
产率/%	92.2 a	83.2 b	67.8 c	65.1 c
含水量/%	2.39 a	1.52 b	0.85 c	0.73 c
电导率EC/(dS/m)	3.47 a	1.15 b	0.74 c	0.96 c
pH	6.54d	7.20 c	8.70b	11.15a
灰分/%	66.4 c	68.8 c	78.3 b	85.2 a
挥发分/%	29.0 a	27.3 a	18.4 b	11.8 b
固定碳/%	2.34 a	2.57 a	2.66 a	2.47 a
阳离子交换量/(cmol/kg)	66.2 a	44.9 b	23.7 c	25.5 c

指标	SBC200	SBC300	SBC500	SBC700
产率/%	92.2 a	83.2 b	67.8 c	65.1 c
含水量/%	2.39 a	1.52 b	0.85 c	0.73 c
电导率EC/(dS/m)	3.47 a	1.15 b	0.74 c	0.96 c
pH	6.54d	7.20 c	8.70b	11.15a
灰分/%	66.4 c	68.8 c	78.3 b	85.2 a
挥发分/%	29.0 a	27.3 a	18.4 b	11.8 b
固定碳/%	2.34 a	2.57 a	2.66 a	2.47 a
阳离子交换量/(cmol/kg)	66.2 a	44.9 b	23.7 c	25.5 c

指标	SBC200	SBC300	SBC500	SBC700
碳元素/(g/kg)	171 a	162 ab	153 b	113 c
氧元素/(g/kg)	100.1 a	57.6 b	32.8 c	19.0 d
氮元素/(g/kg)	21.9 a	19.6 ab	17.3 b	7.1 c
氢元素/(g/kg)	20.9 a	14.1 b	7.3 c	3.1 d
有效磷/(mg/kg)	364 a	236 b	181 c	127 c
有效钾/%	0.96 a	1.04 a	1.27 a	1.34 a
有效钠/%	0.92 a	0.98 a	1.11 a	1.19 a
铵态氮/(mg/kg)	534 a	119 b	21 c	12 c
硝态氮/(mg/kg)	3.47 a	1.97 a	2.77 a	2.72 a

指标	SBC200	SBC300	SBC500	SBC700
碳元素/(g/kg)	171 a	162 ab	153 b	113 c
氧元素/(g/kg)	100.1 a	57.6 b	32.8 c	19.0 d
氮元素/(g/kg)	21.9 a	19.6 ab	17.3 b	7.1 c
氢元素/(g/kg)	20.9 a	14.1 b	7.3 c	3.1 d
有效磷/(mg/kg)	364 a	236 b	181 c	127 c
有效钾/%	0.96 a	1.04 a	1.27 a	1.34 a
有效钠/%	0.92 a	0.98 a	1.11 a	1.19 a
铵态氮/(mg/kg)	534 a	119 b	21 c	12 c
硝态氮/(mg/kg)	3.47 a	1.97 a	2.77 a	2.72 a

孔径范围/μm	SBC200	SBC300	SBC500	SBC700
0.0071~0.1	3.7	2.1	5.2	4.3
0.1~1	7.7	10.6	13.8	9.9
1~10	25.3	40.4	32.7	29.2
10~50	59.7	42.4	44.1	48.9
50~100	2.3	2.8	3.4	5.3
100~232	1.3	1.7	0.8	2.4