摘要
在高温(29~31℃)环境下,采用控制反应器中溶解氧浓度及结合投加抑制剂NaCl的方式,经过32d的批式操作,在中试规模氧化沟反应器中成功启动短程硝化。33d之后,氨氮降解率超过50%,亚硝化率稳定维持在90%以上。随着季节性降温,在常低温情况下(18~27℃)进行二次启动,第27天亚硝化率大于50%,自第35天开始,通过在氧化沟内形成溶解氧梯度并延长反应时间的方式,在第42天之后亚硝化率稳定在90%以上。对污泥微生物进行高通量测序分析后发现,亚硝化单胞菌(Nitrosomonas)占9.39%,证明在中试氧化沟内成功实现了亚硝化菌的富集。之后转为连续流运行,在进水NH_4^+-N约为70mg/L、HRT为11.2~12.7h的条件下,氧化沟的亚硝化效果最好。对比两次启动过程,常低温下短程硝化启动成功的耗时较高温的长,高温状态下污泥比氨氧化速率为0.037kgN/(kgMLSS·d),而常低温下为0.030kgN/(kgMLSS·d)。
Through oxygen-limited control and NaCl dosing, partial nitrification was successfully achieved in a pilot-scale oxidation ditch after sequencing batch start-up for 32 d under high-temperature （29 -31 ℃）. The removal rate of NH4^＋ -N and nitrite accumulation rate （NAR） was maintained over 50% and 90% respectively after 33 d. As the temperature seasonally decreasing, partial nitrification was successfully start-up at the second time in the regular-low temperature（ 18 -27 ℃）. On the 27th day, NAR was over 50%. From the 35th day, the measures such as formation of oxygen gradient mode and extending the reaction time were adopt in the oxidation ditch, and NAR was maintained over 90% on the 42th day. Though high-throughput sequencing analysis of microorganisms in activated sludge, it was found that Nitrosomonas had a propotion of 9.39%, indicating the successful accumulation of Nitro- somonas in the pilot-scale oxidation ditch. Then the oxidation ditch was transfered to continuous flow operation, the best nitrification effect was achieved when influent NH4^＋ - N was about 70 mg/L and HRT was 11.2 - 12.7 h. Comparing two start-up processes, start-up in the regular-low temperature was more time-consuming than that in high-temperature. The specific ammonia oxidation rate is 0. 037 kgN/ （ kgMLSS ·d） and 0. 030 kgN/（ kgMLSS · d） at the high and regular-low temperature respectively.
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第3期7-13,共7页
China Water & Wastewater
基金
福建省科技计划项目(2015R1004-3)
福建省环保厅科技计划项目(2015R024)
关键词
短程硝化
中试
氧化沟
环境温度
比氨氧化速率
partial nitrification
pilot-scale
oxidation ditch
ambient temperature
specific ammonia oxidation rate
