温度对SBR单级好氧生物除磷性能的影响

Effect of temperatures on biological phosphorus removal in aerobic / extended-idle regime

以合成废水为研究对象,以丙酸钠作为单一碳源,分别设置温度为5、15、25、35℃的4组序批式反应器(R1、R2、R3、R4),考察了温度对单级好氧工艺除磷的影响。结果表明,稳定运行阶段,R1、R2、R3、R4出水磷浓度分别为4.05、2.17、1.34和0.11 mg/L,去除效率分别为61.5%、79.3%、87.2%和99.0%,吸磷速率分别为0.501、1.432、2.538和3.700mg P/(g VSS·h),即提高温度有利于磷的去除。此外,各反应器中多聚磷酸盐激酶(PPK)和外切磷酸盐酶(PPX)活性分别为0.093、0.213、0.376、0.549 U和0.010、0.019、0.029、0.025 U,导致吸磷速率和释磷速率随之增大,可知温度影响聚磷菌PPK和PPX的活性,从而影响除磷效果。静置阶段,聚磷菌体内储能物质糖原质和聚羟基脂肪酸酯基本保持不变,但各反应器均出现了释磷现象,聚磷作为主要供能物质,单位释磷量分别为1.95、6.42、9.90和9.56 mg P/(g TSS),提高温度可促进静置段聚磷分解提供能量,从而驱动好氧吸磷达到更好的除磷效果。

Sodium propionate was adopted as the sole carbon source in synthetic wastewater,and four sequencing batch reactors( SBR) with four temperature gradients( R1 = 5℃,R2 = 15℃,R3 = 25℃,R4 = 35℃)were introduced to investigate the effect of temperature on biological phosphorus removal in aerobic / extended-idle regime. During the long-term operation in four SBRs,the effluent phosphorus concentrations were averagely 4. 05,2. 17,1. 34 and 0. 11 mg / L,with the corresponding 61. 5%,79. 3%,87. 2% and 99. 0% phosphorus removal efficiencies,and the phosphorus removal rates were 0. 501,1. 432,2. 538 and 3. 700 mg P /( g VSS· h),respectively. The results showed that increasing temperature could contribute to phosphorus removal. In addition,the activities of polyphosphate kinase( PPK) and exopolyphosp hate( PPX) were 0. 093,0213,0. 376,0. 549 U and0. 010,0. 019,0. 029,0. 025 U,respectively,and the rates of phosphorus uptaking and releasing increased,which indicated that temperature could impose the activities of PPK and PPX,thus affecting the phosphorus removal. During idle period,contents of glycogen and poly-β-hydroxyalkanoates( PHA) kept stable,while polyphosphate became the main energy source,the phosphorus releasing contents per unit TSS were 1. 95,6. 42,9. 90 and 9. 56 mg P /( g TSS),which implied that the increasing temperature could promote degradation of polyphosphate to provide more energy,thereby achieving better phosphorus uptake.