初沉污泥水解酸化对A^2/O工艺强化除磷影响

Effects of Primary Sludge Hydrolysis on Enhanced Biological Phosphorous Removal in A_2/O Process

挥发性脂肪酸(VFA)是生物除磷过程中的关键物质,增加进水中的VFA可以强化生物除磷效果.提高脂肪酸含量的一个有效方法是对初沉污泥进行水解和酸化,通过对比中试试验和实际污水厂的运行结果,详细讨论了初沉污泥水解对进入生化反应系统的进水水质及ρ(VFA)、ρ(C):ρ(P)的影响.结果表明,初沉污泥水解酸化可以改善进水水质,ρ(BOD5)、ρ(CODcr)、ρ(TP)、ρ(sP)、ρ(SS)相对污水厂初沉出水分别提高61.1%、36.5%、36.1%、17.36%和52.0%,可生物化性指标也相应地提高了20.40%.初沉出水VFA有显著提高,平均值由进水的12增加到56,提高了3.7倍,为后续强化生物脱氮除磷创造了理想的条件.通过初沉污泥水解实现的污泥水解技术,可用于现有污水处理厂为实现生物脱氮除磷目标而实施的升级改造,解决进水中碳源不足的难题.

ρ （VFA） is a key factor in enhanced biological phosphorus removal process, and the effect of biological phosphorous removal can be improved with VFA increased in influent. The effects of primary sludge fermentation on theρ （VFA）,ρ（C）：ρ （P）in the biochemistry reaction system are discussed by comparing the results of pilot test and full scale plant. The results showed that primary fermentation can increase influent index such as ρ （ BOD5 ）, ρ （COD5）, ρ （TP）, ρ （SP）, ρ （SS） comparing the effluent from full scale plant primary sedimentation, separately increased, 61. 1% 、 36.5 %, 36.1%, 17.36 % 和 52.0 %, also the biologic catabolism index improve 20.40 %, and the technology especially in favor of the influent VFA, increased from 12 to 56, about3.7 times, enhance biological phosphorus and nitrogen removal to the biological system. The technology of sludge fermentation can be applied to the municipal wastewater treatment plant where the quantity of the carbon source is low and difficult to biological phosphorus and nitrogen removal in high efficiency.