半短程硝化-厌氧氨氧化处理污泥消化液的脱氮研究

采用实验室规模的半短程硝化-厌氧氨氧化联合工艺,研究了对高氨氮、低ρ(C)/ρ(N)污泥消化液的处理能力.结果表明,在A/O反应器中,短程硝化在温度9～20℃、平均ρDO=5.4 mg/L、SRT值为30 d左右时,进水氨氮负荷0.64 kg/(m3.d)的条件下,经过29 d得以实现,通过控制游离氨ρFA>4 mg/L时,此后,从30—96 d,出水亚硝氮累积率维持在70%左右;短程硝化实现之后,进而实现了半短程硝化,出水氨氮与亚硝氮浓度比维持在1∶1.32左右;采用UASB反应器,接种由好氧颗粒污泥、厌氧颗粒污泥、氧化沟活性污泥及短程硝化活性污泥组成的混合污泥,在避光、厌氧、(30±0.2)℃、pH=7.3～7.9条件下,以污泥消化液经短程硝化处理后的出水为进水,初期进水氨氮、亚硝氮容积负荷分别为0.07、0.10kg/(m3.d),经过24d运行,氨氮和亚硝氮开始出现同步去除现象,195 d时总氮去除负荷达1.03 kg/(m3.d);待半短程硝化运行稳定和厌氧氨氧化反应成功启动后,将二者联立并运行了105 d,最终总氮去除率达到70%.

Study on Half-nitrosofication-ANAMMOX Process for Treatment of Reject Water

Combination of half-nitrification process and anaerobic ammonium oxidation(ANAMMOX) process for the treatment of rejected water with high ammonium and low ρ(C)/ρ(N) are evaluated.The experimental results indicated that the nitrition is realized in 29 d at 9-20 ℃,average DO of 5.4 mg/L,SRT of about 30 d and influent ammonia loading rate of 0.64 kg/(m3·d);The nitrition with 75% nitrite accumulation efficiency maintains between 30-96 d when average FA concentration is more than 4 mg/L in A/O reactor;Furthermore,the half-nitrification is obtained because of effluent ammonia and nitrite ratio of 1∶1.32;Under the condition of(30±0.2) ℃,influent pH of 7.3 to 7.9,making rejected water of nitrition as influent,and initial ammonia and nitration load of 0.07 kg/(m3·d) and 0.10 kg/(m3·d) respectively,simultaneous removal of ammonia and nitrite take place in 24 d in UASB reactor inoculating with mixed sludge consisted of aerobic granular sludge,anaerobic granular sludge,oxidation ditch sludge and nitrition sludge,and the total nitrogen removal reaches up to 1.03 kg/(m3·d) was reached in 186 d.After half-nitrosofication operated steadily and ANAMMOX starts up successfully,the total nitrogen removal reaches 70% when they are combined for 105 d.