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Transformation and release of phosphorus from waste activated sludge upon combined acid/alkaline treatment

机译：酸/碱联合处理后，废活性污泥中磷的转化和释放

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This study was conducted to investigate migration and transformation of phosphorus (P) in waste activated sludge (WAS) during sequential processes of acid and alkaline treatments. The P mass balance analysis and the transformation of various P species from solid to liquid phase were also studied. Compared with single acid or alkaline experiments, the migration of total solid-P to liquid-P was promoted by the acid-alkaline sequential treatment. Acid-alkaline sequential treatment increased dissolution of non-apatite IP (NAIP) and decreased apatite P sediments in the final alkaline from the released species, resulting in enhancing the inorganic P (IP) transformation from solid to liquid phase. The maximal accumulation of molybdate reactive P (MRP) in liquid was 520 mg L?1, accounting for 54.7% of total P. However, the P release was reduced when alkaline-acid sequential treatment was used because of a low liquid P release from NAIP. It was found that solid-P transforming to liquid-MRP was mainly regulated by pseudo-chemical reactions regardless of a constant or changed pH. The release efficiencies of NAIP under both alkaline and acid-alkaline conditions were more than 88.0%, whereas it was only 6.2% with alkaline-acid treatment. The findings in this study can help to understand the phosphate release and migration rules under different WAS treatment conditions for future P recovery.
机译：这项研究的目的是研究酸性和碱性处理过程中磷（P）在废活性污泥（WAS）中的迁移和转化。还研究了磷的质量平衡分析和各种磷从固相到液相的转变。与单一的酸或碱实验相比，酸-碱序贯处理促进了总固磷向液磷的迁移。酸碱序贯处理可提高非磷灰石IP（NAIP）的溶解度，并减少释放物质中最终碱中磷灰石P的沉积物，从而增强无机P（IP）从固相到液相的转化。液体中钼酸盐反应性P（MRP）的最大积累为520 mg L ？1 ，占总P的54.7％。但是，碱性时P的释放减少由于从NAIP释放出的液态P少，因此使用了酸连续处理。发现无论是恒定的还是变化的pH，从固-P向液体-MRP的转化主要受假化学反应的调控。在碱性和酸性-碱性条件下，NAIP的释放效率均大于88.0％，而在碱性-酸性处理下，NAIP的释放效率仅为6.2％。这项研究中的发现可以帮助理解在不同的WAS处理条件下磷酸盐的释放和迁移规律，以便将来回收P。

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