Sterling M C, Lacey R E, Engler C R, Ricke S C
Department of Agricultural Engineering, Texas A&M University, College Station, 77843, USA.
Bioresour Technol. 2001 Mar;77(1):9-18. doi: 10.1016/s0960-8524(00)00138-3.
A number of researchers have verified the inhibitory effects of elevated H2 concentrations on various anaerobic fermentation processes. The objective of this work was to investigate the potential for using hydrogen gas production to predict upsets in anaerobic digesters operating on dairy cattle manure. In an ammonia nitrogen overload experiment, urea was added to the experimental digesters to obtain increased ammonia concentrations (600, 1,500, or 3,000 mg N/l). An increase in urea concentration resulted in an initial cessation of H2 production followed by an increase in H2 formation. Additions of 600, 1,500, or 3,000 mg N/l initially resulted in the reduction of biogas H2 concentrations. After 24 h, the H2 concentration increased in the 600 and 1,500 mg N/l digesters, but production remained inhibited in the 3,000 mg N/l digesters. Both methane and total biogas production decreased following urea addition. Volatile solids reduction also decreased during these periods. The digester effluent pH and alkalinity increased due to the increased NH4 formed with added urea. Based on these results, changes in H2 concentration could be a useful parameter for monitoring changes due to increased NH3 in dairy cattle manure anaerobic digesters.
许多研究人员已经证实了升高的氢气浓度对各种厌氧发酵过程的抑制作用。这项工作的目的是研究利用产氢来预测以奶牛粪便为原料的厌氧消化器故障的可能性。在氨氮过载实验中，向实验消化器中添加尿素以提高氨浓度（600、1500或3000 mg N/l）。尿素浓度的增加导致氢气产生最初停止，随后氢气生成增加。添加600、1500或3000 mg N/l最初导致沼气中氢气浓度降低。24小时后，600和1500 mg N/l消化器中的氢气浓度增加，但3000 mg N/l消化器中的氢气产生仍受到抑制。添加尿素后，甲烷和总沼气产量均下降。在此期间，挥发性固体减少量也下降。由于添加尿素形成的NH4增加，消化器出水的pH值和碱度升高。基于这些结果，氢气浓度的变化可能是监测奶牛粪便厌氧消化器中由于氨增加而引起变化的一个有用参数。
