SONGXiao-ya,ZHANGJian-xin,ZHANGRong-bing,et al.Productive Experiment of Kitchen Waste and Municipal Sludge Anaerobic Co-digestion in Beijing Gao’antun Sludge Treatment Center[J].China Water & Wastewater,2024,40(4):99-106.
Productive Experiment of Kitchen Waste and Municipal Sludge Anaerobic Co-digestion in Beijing Gao’antun Sludge Treatment Center
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第4期
Page:
99-106
Column:
Date of publication:
2024-02-17
- Abstract:
- Both kitchen waste and municipal sludge are municipal organic wastes, and anaerobic digestion is used as an important means to achieve resource utilization, reduction and stabilization. The co-digestion of the two can theoretically avoid the problems of easy acidification of kitchen waste anaerobic digestion alone and low gas production rate of sludge digestion alone. Using the current sludge treatment facilities of Beijing Gao’antun sludge treatment center, a large-scale productive experiment was carried out to verify the actual effect of co-processing by combined mesophilic anaerobic digestion of pretreated kitchen slurry and municipal sludge. During the experiment, the synergistic system was stable with obvious disposal effect. The actual gas production was basically consistent with the theoretical gas production. The acid-base ratio in the digestion tank was lower than 0.12, and the ammonia nitrogen content was lower than 4 000 mg/L. The peak organic load of digestion tank was 3.399 kgVS/(m3·d), the average decomposition rate of organic matter was 63.59%, the average unit organic matter gas production rate was 1.41 m3/kgVS, and the average dry solid biogas yield was 571 m3/tDS, which was 2.7%, 15.2%, 5.2% and 31% higher than that of sludge anaerobic digestion alone. However, it should be noted that with the increase of the kitchen waste proportion, the methane content in biogas decreased slightly. In addition, optimization measures are proposed for the sludge inlet and outlet operation of the co-processing digestive system.
Last Update:
2024-02-17