Environmental Sanitation Engineering ›› 2026, Vol. 34 ›› Issue (1): 67-71.doi: 10.19841/j.cnki.hjwsgc.2026.01.008

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Technological Parameters Analysis for the Deamination of Biogas Slurry by Thermal Extraction: Taking a Food Waste Recycling Project as an Example

LIU Zixing   

  1. Shanghai Municipal Engineering Design Institute (Group) Ltd.
  • Online:2026-02-28 Published:2026-02-28

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Abstract: This study designed and operated a 100 m3/d thermal extraction deammonification system for treating anaerobic digestate from a food waste recycling project. The effects of inlet position, ammonia reflux, and operating temperature on deammonification efficiency were investigated through pilot-scale experiment, and equipment clogging after operation was further revealed. The system operated for 50 days, treating a total of 4 086 m3 of digestate with a treatment load of 4.14 m3/h. The comprehensive cost of treating digestate using thermal extraction deamination system was calculated to be approximately 23.59 yuan/t, with an average deammonification efficiency of 58.92%. The significantly increased COD/NH4+ ratio for deammonification biogas slurry indicated that it could reduce carbon source addition during the treatment process of digestate deamination. The results demonstrate that the thermal extraction deammonification process is feasible for treating anaerobic digestate and can be further engineered for application in food waste resource recovery projects.

Key words: food waste, anaerobic biogas slurry, thermal extraction deamination, pilot scale test

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