在现有的同步消解测定方法的基础上,探讨更适合测定景观水总氮总磷浓度的方法,在测定总氮浓度时,省去向消解液中加1 m L盐酸(1+9)的步骤。即在25 m L水样中加入50 g/L过硫酸钾溶液10 m L,20 g/L氢氧化钠溶液6 m L,120℃下消解50 min。...在现有的同步消解测定方法的基础上,探讨更适合测定景观水总氮总磷浓度的方法,在测定总氮浓度时,省去向消解液中加1 m L盐酸(1+9)的步骤。即在25 m L水样中加入50 g/L过硫酸钾溶液10 m L,20 g/L氢氧化钠溶液6 m L,120℃下消解50 min。结果表明,该方法实用,测定结果更准确,并有效提高了测定效率。展开更多
A combined nitritation–anammox reactor was developed to treat the digestion supernatant under various C/N ratios. Due to the difficulties for heterotroph to utilize the refractory organics, the reactor presented rela...A combined nitritation–anammox reactor was developed to treat the digestion supernatant under various C/N ratios. Due to the difficulties for heterotroph to utilize the refractory organics, the reactor presented relatively stable performance with increasing supernatant addition. Nevertheless, the adverse effects of supernatant would accumulate during the long-term operation and thus weakened the activity and shock resistance of microbes,which further led to the gradual decrease of reactor performance after 92 days＇ operation.Under this circumstance, supernatant with volatile fatty acids（VFAs） residuals was further introduced into the reactor to investigate the performance of combined nitritation–anammox process with VFA addition. With the appearance of VFAs, the nitrogen removal performance gradually restored and the reactor finally achieved stable and efficient performance with C/N ratio of 0.35. The VFA residuals within 150 mg/L in the supernatant served as the extra electron donors and stimulated the heterotrophic denitrification process, which was vital for the enhancement of reactor. The nitrogen removal rate and total nitrogen removal efficiency reached 0.49 kg N/（m^3·day） and 88.8% after 140 days＇ operation, respectively. The combined nitritation–anammox reactor was proved suitable to treat digestion supernatant.展开更多
文摘在现有的同步消解测定方法的基础上,探讨更适合测定景观水总氮总磷浓度的方法,在测定总氮浓度时,省去向消解液中加1 m L盐酸(1+9)的步骤。即在25 m L水样中加入50 g/L过硫酸钾溶液10 m L,20 g/L氢氧化钠溶液6 m L,120℃下消解50 min。结果表明,该方法实用,测定结果更准确,并有效提高了测定效率。
基金supported by the Mega-Projects of Science Research for Water Environment Improvement (No. 2012ZX07205-001)
文摘A combined nitritation–anammox reactor was developed to treat the digestion supernatant under various C/N ratios. Due to the difficulties for heterotroph to utilize the refractory organics, the reactor presented relatively stable performance with increasing supernatant addition. Nevertheless, the adverse effects of supernatant would accumulate during the long-term operation and thus weakened the activity and shock resistance of microbes,which further led to the gradual decrease of reactor performance after 92 days＇ operation.Under this circumstance, supernatant with volatile fatty acids（VFAs） residuals was further introduced into the reactor to investigate the performance of combined nitritation–anammox process with VFA addition. With the appearance of VFAs, the nitrogen removal performance gradually restored and the reactor finally achieved stable and efficient performance with C/N ratio of 0.35. The VFA residuals within 150 mg/L in the supernatant served as the extra electron donors and stimulated the heterotrophic denitrification process, which was vital for the enhancement of reactor. The nitrogen removal rate and total nitrogen removal efficiency reached 0.49 kg N/（m^3·day） and 88.8% after 140 days＇ operation, respectively. The combined nitritation–anammox reactor was proved suitable to treat digestion supernatant.
