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A new process is developed for biogas upgrading using the total ammonia nitrogen (TAN) in biogas slurry as a renewable absorbent. TAN in biogas slurry can be transferred into free ammonia by adding NaOH to increase the solution pH. Increasing the pH of biogas slurry to 10 causes that >90% TAN transfers into free ammonia, leading to high TAN removal ratios. However, further increasing the pH of...
Biogas slurry can be adopted as a renewable CO2 absorbent to combine CO2 absorption with CO2 biological fixation. However its CO2 absorption performance should be enhanced. In the study, biomass ash was adopted as the additive to increase free ammonia concentration in the biogas slurry. And the effect of biomass ash dosage on CO2 absorption performance of biogas slurry was investigated in the typical...
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