EFFECT OF VENTILATION ON DECOMPOSITION AND NITROGEN CONVERSION OF RAPID THERMOPHILIC COMPOSTING OF KITCHEN WASTE

FAN Xinqi; CHEN Rui; LI Wanting; WEI Yuquan; LIU Yongdi; ZHAN Yabin; LI Ji

doi:10.13205/j.hjgc.202204011

Volume 40 Issue 4

Apr. 2022

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FAN Xinqi, CHEN Rui, LI Wanting, WEI Yuquan, LIU Yongdi, ZHAN Yabin, LI Ji. EFFECT OF VENTILATION ON DECOMPOSITION AND NITROGEN CONVERSION OF RAPID THERMOPHILIC COMPOSTING OF KITCHEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 71-78. doi: 10.13205/j.hjgc.202204011

Citation:

FAN Xinqi, CHEN Rui, LI Wanting, WEI Yuquan, LIU Yongdi, ZHAN Yabin, LI Ji. EFFECT OF VENTILATION ON DECOMPOSITION AND NITROGEN CONVERSION OF RAPID THERMOPHILIC COMPOSTING OF KITCHEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 71-78. doi: 10.13205/j.hjgc.202204011

Citation:

FAN Xinqi, CHEN Rui, LI Wanting, WEI Yuquan, LIU Yongdi, ZHAN Yabin, LI Ji. EFFECT OF VENTILATION ON DECOMPOSITION AND NITROGEN CONVERSION OF RAPID THERMOPHILIC COMPOSTING OF KITCHEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 71-78. doi: 10.13205/j.hjgc.202204011

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EFFECT OF VENTILATION ON DECOMPOSITION AND NITROGEN CONVERSION OF RAPID THERMOPHILIC COMPOSTING OF KITCHEN WASTE

doi: 10.13205/j.hjgc.202204011

FAN Xinqi^1,2,
CHEN Rui^1,2,
LI Wanting^1,2,
WEI Yuquan^1,2,
LIU Yongdi^1,2,
ZHAN Yabin^1,2,
LI Ji^{1,2
,
,}

1. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;
2. Organic Recycling Research Institute(Suzhou) of China Agricultural University, Suzhou 215100, China

Received Date: 2021-07-03
Available Online: 2022-07-06

Abstract

Abstract

Aiming at the problems of long traditional composting cycle, low dehydration efficiency, and poor insulation preservation effect, this research used kitchen waste and sawdust as raw materials, based on a composting reactor with external heat source, the effect of ventilation modes (natural ventilation and high-temperature ventilation with external heat source) and ventilation rates on temperature, moisture content, oxygen content, maturity index (pH, electric conductivity, germination index) and nitrogen form transformation during high-temperature composting of food waste were studied. The results showed that: 1) the high-temperature ventilation mode was helpful to maintain high temperature of the reactor, significantly prolonged the high temperature period, improved the water removal rate and maturity of the reactor. Compared with natural ventilation, the high temperature period (≥50 ℃) under high temperature ventilation was extended for 6 days, the cumulative temperature increased by 51.77%, the water removal rate increased by 62.37%, and the seed germination rate increased by 14.75%; 2) compared with natural ventilation, the ammonia volatilization and nitrogen loss under high temperature ventilation treatment increased by 131.46% and 74.87% respectively; 3) the increase of ventilation rate could improve the water removal rate. When the aeration rate reached 0.75 L/(kg DM·min), the water removal rate reached the peak value of 80.31%; 4) in the high-temperature ventilation mode, ammonia volatilization and nitrogen loss increased with the increase of ventilation rate, and ammonia volatilization accounted for 55.48%~70.73% of nitrogen loss, which was the main way of nitrogen loss.
- food waste,
- thermophilic composting,
- thermal assist,
- rapid degradation

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References(27)

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