摘要
以实际城市生活污水为处理对象,应用改良UCT分段进水工艺研究反硝化除磷的实现途径与维持方法,探讨工艺运行参数对反硝化除磷性能的影响,并分析了强化缺氧吸磷对提高系统脱氮除磷效率的作用和稳定维持反硝化除磷的控制策略。结果表明,通过A/O分段进水工艺向改良UCT分段进水工艺运行方式的转变,可以成功富集反硝化聚磷菌,最高比例达39.2%,污泥缺氧吸磷速率为3.19～4.48mg P.(g VSS)-1.h-1。缺氧/好氧吸磷速率和磷去除率随厌氧池体积的增加而增加,最佳体积分配为34/102/204L(1/3/6)。控制污泥回流和内循环分别为100%和75%时,能合理保证厌氧池的厌氧环境(ORP维持在-400～-150mV),以及缺氧池合适的污泥浓度和硝酸盐浓度(1～2mg.L-1),强化反硝化吸磷性能。另外,建立相应的控制策略:(1)根据厌氧池ORP值控制内循环;(2)通过缺氧出水硝酸盐浓度控制污泥回流;(3)通过厌氧释磷量和出水COD浓度来调节厌氧/缺氧/好氧池体积分配;(4)根据进水碳氮磷比调整各段进水流量分配比。
Denitrifying phosphorus removal was stably achieved with a biological step feed nutrient removal process from real municipal wastewater.The effects of operational parameters on the denitrifying phosphorus removal and the improvement of nutrient removal by intensifying anoxic phosphorus uptake as well as control strategies about maintenance of denitrifying phosphorus removal in the modified University of Cape Town（UCT）step feed process were discussed.The results indicated that denitrifying accumulating bacteria（DPAOs）could be successfully enriched with the maximum proportion and anoxic phosphorus uptake rate of 39.2% and 3.19—4.48 mg P·（g VSS）^-1·h^-1 respectively,according to the process shift from the A/O model to the modified UCT model.Both anoxic and aerobic phosphorus uptake rates and phosphorus removal efficiency increased with the increase of anaerobic volumes,and the optimum anaerobic/anoxic/oxic volume distribution was 34/102/204L（1/3/6）.When the sludge return ratio and internal recycle ratio were respectively set at 100% and 75%,it was beneficial to the achievement of true anaerobic environment in anaerobic zones with ORP of-400—-150 mV and suitable mixed liquor suspended solids concentrations and nitrate 1—2 mg·L^-1 in anoxic zones,all of which aided to enhance the denitrifying phosphorus removal performance.In addition,several control strategies were as well established as follows：（1）Control the internal recycle ratio by the value of ORP in anaerobic zones;（2）Adjust sludge return ratio according to nitrate in anoxic effluent;（3）Set the volumes ratios based on the anaerobic phosphorus release amounts and COD concentrations;（4）Regulate the influent distribution according to influent nutrient ratios.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2011年第9期2615-2622,共8页
CIESC Journal
基金
国家'十一五'重大科技专项(2008ZX07317-007-105)
'城市水资源与水环境国家重点实验室'开放基金项目(QAK201006)~~
关键词
分段进水
脱氮除磷
开普敦工艺
反硝化除磷
step feed
nitrogen and phosphorus removal
UCT
denitrifying phosphorus removal
