Optimization and evaluation of an air-recirculated stripping for ammonia removal from the anaerobic digestate of pig manure
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.
Anaerobic digestate of pig manure Response surface methodology Air-recirculated stripping
Liu liang Pang changle Wu shubiao Dong renjie
College of Agriculture and Biotechnology,China Agricultural University,100193 Beijing,PR China;Chong Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture,Colle
国内会议
重庆
英文
32-41
2016-05-25（万方平台首次上网日期，不代表论文的发表时间）