[Influencing factors of sludge liquor treatment in UASBB]

The effect of ammonia nitrogen concentration, temperature, pH, HRT and C/N ratio on ANAMMOX was studied. The reactor was fed with sludge liquor. The efficiency of nitrogen removal for the UASBB was researched under different ammonia nitrogen concentration, HRT, temperature, pH and C/N ratio when the influent rho(NH4(+) -N)/rho(NO2(-) -N) was controlled at 1:1.32. The results showed that the nitrogen removal rate for the ANANMMOX reactors was optimal when the influent NH4(+) -N and NO2(-) -N concentrations were 200 mg x L(-1) and 264 mg x L(-1), HRT was 24 h, temperature was in the range of 30-35 degrees C, pH was at 7.5-8.5 and the C/N ratio was 0.5. The average removal rates of NH4(+) -N, NO2(-) -N and TN were 75.72%, 76.36% and 70.19%, respectivley, the average TN was 0.464 kg x (m3 x d)(-1) and the removal rate of COD was 30%. The efficiency of nitrogen removal for the ANAMMOX reactors could be enhanced by controlling ammonia nitrogen concentration and HRT. The efficiency of ANAMMOX bacteria was optimal when temperature and pH were suitable. The denitrification occurred in the ANAMMOX reactors when the influent contained organics. The inhibition of denitrification bacteria on the ANAMMOX increased with rising concentration of organics.