DO/NH_4^+-N调控实现MBBR工艺生活污水短程硝化

DO/NH_4^+-N control to achieve partial nitrification of municipal wastewater in MBBR process

选取溶解氧(DO)浓度和出水氨氮(NH_4^+-N)浓度作为控制因素,探究不同温度和有机碳源投加量(COD/NH_4^+-N)下,实现生物膜工艺短程硝化的可行性和对DO/NH_4^+-N值(R值)的需求.15,20,25℃时,实现短程硝化的R值分别约为0.08,0.17,0.25,说明比值控制可实现短程硝化,且R值的降低可弥补温度降低的不利影响;DO为3.5mg/L,NH_4^+-N浓度为14mg/L时,短程硝化实现,而DO和NH_4^+-N浓度分别为1.8,3mg/L,短程硝化破坏,说明实现生物膜反应器短程硝化,由DO/NH_4^+-N决定,而不仅仅是DO;有机碳源含量分别为0,60mg/L时,实现短程硝化的R值由0.25升至0.38,但R=0.6短程硝化破坏,说明投加有机碳源增多,R调控范围变大,便于实现短程硝化,但R增长幅度有限.

This paper selects the dissolved oxygen(DO)concentration and the effluent ammonia concentration(NH4+-N)as control factors,exploring the feasibility of nitrification and the value of DO/NH4+-N(R-value)in biofilm process under the different temperature and organic carbon source dosage(COD/NH4 +-N).At15,20,25℃,the DO/NH4+-N value of partial nitrification was about0.08,0.17,0.25,respectively.It shows that ratio control can realize partial nitrification,and the reduction of R can make up for the adverse effect of temperature reduction.When the concentration of DO was3.5mg/L and the ammonia concentration was14mg/L,the partial nitrification was achieved,while the concentration of DO and ammonia respectively was1.8mg/L,3mg/L,and the partial nitrification was destroyed,which indicated that the realization of partial nitrification in biofilm reactor was decided by DO/NH4+-N,not just DO.The organic carbon content were0,60mg/L respectively,R-value of partial nitrification increasing from0.25to0.38,but the partial nitrification damaging in R=0.6,which illustrated that the more organic carbon source were added,the regulation scope of R is broader,facilitating the realization of partial nitrification,but the R amplification is limited.