PYROLYSIS PERFORMANCE AND EVOLVED GAS ANALYSIS OF MIXED SEWAGE SLUDGE CONTAINING KITCHEN WASTE

ZHOU Yang; JIN Baosheng

doi:10.13205/j.hjgc.202210011

Volume 40 Issue 10

Oct. 2022

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ZHOU Yang, JIN Baosheng. PYROLYSIS PERFORMANCE AND EVOLVED GAS ANALYSIS OF MIXED SEWAGE SLUDGE CONTAINING KITCHEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(10): 80-87,175. doi: 10.13205/j.hjgc.202210011

Citation:

ZHOU Yang, JIN Baosheng. PYROLYSIS PERFORMANCE AND EVOLVED GAS ANALYSIS OF MIXED SEWAGE SLUDGE CONTAINING KITCHEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(10): 80-87,175. doi: 10.13205/j.hjgc.202210011

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PYROLYSIS PERFORMANCE AND EVOLVED GAS ANALYSIS OF MIXED SEWAGE SLUDGE CONTAINING KITCHEN WASTE

doi: 10.13205/j.hjgc.202210011

ZHOU Yang,
JIN Baosheng^,

Key Laboratory of Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Received Date: 2021-12-19

Abstract

Abstract

This study aimed to solve the sludge treatment issues caused by kitchen waste entering the municipal network. This study used kitchen waste to produce the primary sludge (PS), then mixed it with different amounts of residual sludge (RS) to produce the mixed sewage sludge(MSS). The pyrolysis performance and evolved gas properties of mixed sewage sludge containing food waste were evaluated by TG-FTIR. The mass loss could be divided into 3 stages:initial dehydration, major decomposition, and continuous slight decomposition. With the increase of PS proportion, the reaction rate and pyrolysis characteristic parameter (CPI) got improved, and the reaction time got reduced, thus improving the performance of sewage sludge pyrolysis. The interactions between PS and RS varied at different temperatures, the low-temperature region (<300℃) was almost non-interactive, the medium temperature region (300~550℃) was mutually promoting, and the high-temperature region (550~850℃) was mutually inhibiting. FTIR detected 6 main gaseous products and functional groups of CH₄, CO₂, H₂O, CO, CO and SO₂. The results showed that the production of evolved gases and functional groups were increased with the increase of PS percentage, and CO₂ was the main gaseous product. The interactions were not only reflected in the mass loss process but also in the product evolution process, and PS50RS50 showed the most obvious mutual promotion effect, which could be considered as the best ratio. With the increase of temperature, the products generally reached the maximum in the range of 500~600℃, which can be considered as the best pyrolysis temperature.
- pyrolysis,
- kitchen waste,
- sewage sludge,
- TG-FTIR

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References(16)

References

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