Abstract
Aiming at the problems of the subsequent treatment of the biogas liquid membrane concentrate and the large alkali consumption of the traditional stripping process, a two-stage closed-cycle ammonia stripping process was designed, and the two-stage air-recirculation ammonia stripping process was used to treat the biogas liquid membrane concentrate. Studies have shown that in the first stage of ammonia stripping, when the gas-liquid ratio is 3600, the pH of the membrane concentrate liquid after the closed loop treatment reaches the maximum value of 8.75, and the alkalinity is also reduced from the initial 8150 to 6615.After the primary stripping is completed, the pH of the membrane concentrate can be quickly increased by adding alkali to meet the normal ammonia stripping conditions for the secondary stripping tower. When the liquid ratio of the secondary stripping tower is 3600, the temperature is 40°C, and the CaO dosage is 25g/L, the removal rate of ammonia nitrogen is 86%. Adding a first-stage tower blowing off, the CaO dosage is reduced by 5g/L.
Highlights
In recent years, biogas projects have been widely used for the treatment of large-scale livestock and poultry farming manures, but at the same time, wastes such as biogas residues and liquids will be generated
The stripping method is the most commonly used physical method to treat ammonia nitrogen wastewater. It uses the difference between the concentration of volatile substances such as ammonia nitrogen contained in the wastewater and the corresponding equilibrium concentration in the gas phase
Aiming at the above problems, this paper proposes a two-stage closed-cycle ammonia stripping system to study the effect of the system on the treatment of ammonia nitrogen in the liquid membrane concentrate of livestock and poultry breeding, and provide technical reference for the subsequent use of the process and the advanced treatment of the biogas slurry
Summary
Biogas projects have been widely used for the treatment of large-scale livestock and poultry farming manures, but at the same time, wastes such as biogas residues and liquids will be generated. The stripping method is the most commonly used physical method to treat ammonia nitrogen wastewater It uses the difference between the concentration of volatile substances such as ammonia nitrogen contained in the wastewater and the corresponding equilibrium concentration in the gas phase. Aiming at the above problems, this paper proposes a two-stage closed-cycle ammonia stripping system to study the effect of the system on the treatment of ammonia nitrogen in the liquid membrane concentrate of livestock and poultry breeding, and provide technical reference for the subsequent use of the process and the advanced treatment of the biogas slurry
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