诱导结晶对反硝化除磷的强化作用

Enhancing effect of induced crystallization process on denitrifying phosphorus removal

以双污泥-诱导结晶工艺为研究对象,考察诱导结晶工艺回收磷对反硝化除磷的强化作用.结果表明,当摩尔比n(Ca2+)/n(PO34--P)提高到5∶1时,反应器内回收率没有明显的提高,最佳n(Ca2+)/n(PO34--P)为3∶1,回收率可达62.05%;提高磷回收量对厌氧释磷影响并不大,当释磷量保持在(13.44±0.55)mg/L时,聚磷量由21.11 mg/L降至16.42 mg/L,聚磷量与释磷量之比从1.51降至1.24,化学回收磷减轻了生物除磷负担;提高结晶磷回收量会降低聚磷速率,但反硝化聚磷反应均在30 min之后停止,化学回收磷不会对生物除磷造成负面影响,并且生物除磷与化学回收磷相结合的工艺可以在较低进水碳磷质量比的情况下保证出水达到国家排放标准.

To investigate the enhancing effect of induced crystallization on the denitrifying phosphorus removal,experiments w ere carried out by combining the tw o-sludge system and the induced crystallization process.The results show that the phosphorus recovery rate of induced crystallizer is not greatly improved w hen the mole ratio of n（Ca^2 ＋） /n（PO4^3--P） reaches 5∶ 1.The optimum value of n（Ca^2 ＋） /n（PO4^3--P） is 3∶ 1 w hich achieves a phosphorus recovery rate of 62.05%.Appropriately increasing the amount of phosphorus recovery does not have a significant effect on the amount of anaerobic phosphorus release.When the amount of phosphorus release maintains at（13.44 ± 0.55） mg/L,the amount of phosphorus uptake decreases from 21.11 to 16.42 mg/L.The ratio of phosphorus uptake amount to release amount falls from 1.51 to 1.24 along w ith a high recovery rate,w hich means that the burden of bio-P removal is lightened.During the prior period of denitrifying phosphorus removal,the rate of phosphorus uptake goes dow n w hile the amount of phosphorus recovery increases,but the reaction of denitrifying phosphorus removal all ends after 30 min.Chemical phosphorus recovery do not cause negative effect on biological phosphorus removal.Moreover,the process w hich combines biological phosphorus removal w ith chemical phosphorus recovery can ensure that the effluent quality meets the related requirements under the condition of low influent CODto-phosphorus mass ratio.