Ca~(2+)、Mg~(2+)对好氧污泥快速颗粒化的影响研究

为研究金属离子的投加对好氧污泥颗粒化进程的影响,在3个构造一致的序批式活性污泥反应器(SBR)中分别接种普通活性污泥、投加50 mg·L-1Ca2+的活性污泥和投加50 mg·L-1Mg2+的活性污泥来培养好氧颗粒污泥.结果表明:金属离子的投加能缩短好氧污泥颗粒化时间,改善颗粒污泥的性质,Ca2+更多地影响颗粒污泥的物理性质,Mg2+主要影响生化性质.Ca2+、Mg2+的投加可促进细胞分泌胞外聚合物(EPS),以及蛋白质(PN)和多糖(PS)的含量增加,且Mg2+较Ca2+对EPS中组分及组分比例影响更大.此外,Ca2+、Mg2+投加下培养的好氧颗粒污泥具有更强的除污性能.

Effects of Ca2+ and Mg2+ on rapid granulation of aerobic sludge

The effect of metal ions on the formation of aerobic granular sludge was investigated using three SBR reactors. Two of the reactors were dosed with 50 mg·L^-1 Ca²⁺ and 50 mg·L^-1 Mg²⁺, respectively, while the other was run as a control. Results demonstrated that dosing metal ions could accelerate the formation of aerobic granules and improve their properties. Ca²⁺ mainly affected the physical properties of granular sludge, while Mg²⁺ primarily affected their biochemical properties during granulation. Furthermore, both Ca²⁺ and Mg²⁺ could promote the sludge cells to secrete more PN and PS in EPS. Compared with Ca²⁺, Mg²⁺ had significant influence on the compositions of EPS of granular sludge. In addition, aerobic granular sludge cultivated with the dosage of Ca²⁺ and Mg²⁺ had stronger decontamination performances.