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Shubiao Wu

Optimization and evaluation of an air-recirculated stripping for ammonia removal from the anaerobic digestate of pig manure

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  • Liang Liu, China Agricultural University, Chongqing Academy of Animal Science
  • ,
  • Changle Pang, China Agricultural University
  • ,
  • Shubiao Wu
  • Renjie Dong, China Agricultural University

An air-recirculated stripping involved two processes and did not require any pretreatment. First, stripping CO2 decreased the buffer capacity of the anaerobic digestate, thereby reducing the amount of lime used to achieve a high pH. Second, lime was added to increase pH and remove ammonia from the anaerobic digestate of pig manure. pH increased from 8.03 to 8.86 by stripping CO2 in the first process (gas-to-liquid ratio = 180) and further reached 12.38 in the second process (gas-to-liquid ratio = 300). During process optimization, the maximum ammonia removal efficiency reached 96.78% with a lime dose of 22.13 g. The value was close to 98.25%, which was the optimal result predicted by response surface methodology using the software Design-Expert 8.05b. All these results indicated that air-recirculated stripping coupled with absorption was a promising technology for the removal and recovery of nitrogen in the anaerobic digestate of pig manure.

TidsskriftProcess Safety and Environmental Protection
Sider (fra-til)350-357
Antal sider8
StatusUdgivet - 2015
Eksternt udgivetJa

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