控制BNR工艺好氧、反硝化除磷效果因素实验研究

以实验室动态生物营养物去除(BNR)工艺(BCFS)运行实验为基础,采用静态实验,研究了厌氧初始COD、碳源种类和反应时间对好氧吸磷和反硝化除磷效果的影响,同时将二者进行对比.实验结果表明,好氧吸磷效果随厌氧初始COD升高而增加.厌氧初始COD相同时,以葡萄糖为碳源的实验吸磷速率最快,4 h好氧反应后残余PO34-浓度最低;但以乙酸和丙酸为碳源的实验表现出更强的超量吸磷能力.缺氧条件下,常规反硝化细菌(OHO)引起的常规反硝化限制了本来就速率较低的反硝化除磷过程.当厌氧初始COD为400 mg·L-1时,以葡萄糖、乙酸和丙酸为碳源的实验中反硝化除磷占总除磷量的比例分别为46.12%、32.03%和21.96%.

Experimental study on factors controlling aerobic and anoxic P-uptake in BNR processes

Anaerobic P-release,aerobic P-uptake and anoxic P-uptake are important factors controlling the overall efficiency of bio-Premoval in Biological Nutrient Removal(BNR)processes.Based on a lab-scale BNR process(BCFS),batch experiments were conducted to study the effects of initial anaerobic COD concentrations,carbon sources and HRT on aerobic P-uptake and anoxic P-uptake.Further,the results of P-uptake under aerobic and anoxic conditions are compared.The results from batch experiments indicate that P-uptake increased with increasing influent COD.With glucose used as carbon source,residual PO₄^3- in bulk under aerobic P-uptake in 4h was the lowest among the three tested carbon sources.Using acetate and propionate as carbon sources,however,increased the capacity of the system for continuous uptake of phosphate.Under anoxic conditions,Ordinary Heterotrophic Organisms(OHO)probably limited denitrifying dephosphatation,resulting in a lower anoxic P-uptake rate.The ratios of anoxic P-uptake to total P-uptake were 46.12%,32.03% and 21.96% for glucose,acetate and propionate,respectively,when the initial anaerobic COD concentration was 400 mg·L^-1.