Behavior of inorganic elements during sludge ozonation and their effects on sludge solubilization.
Behavior of inorganic elements during sludge ozonation and their effects on sludge solubilization.
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DOI：
10.1016/j.watres.2010.12.011
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发表时间：
2011-02
期刊：
影响因子：
12.8
通讯作者：
Pengzhe Sui;F. Nishimura;H. Nagare;T. Hidaka;Yuko Nakagawa;H. Tsuno
中科院分区：
文献类型：
--
作者：
Pengzhe Sui;F. Nishimura;H. Nagare;T. Hidaka;Yuko Nakagawa;H. Tsuno
通过批量试验研究了无机元素（包括磷、氮和金属）在污泥臭氧化过程中的行为，并阐明了金属对污泥增溶的影响。与4.7 ~ 7.4 mgfe /gSS相比，80 ~ 120mgfe /gSS的铁含量较高，污泥增溶率降低了50%。在臭氧化过程中，污泥的pH值从7下降到5，导致化学沉淀金属和磷的溶解。实验结果和热力学计算表明，随着ph值的降低，铁、铝沉淀的磷酸盐更难释放，钙沉淀的磷酸盐更难释放。钡、锰、铬的释放量不超过10%，远低于COD的增溶；而镍、铜和锌的增溶效果与COD相似。氮增溶比是COD增溶比的1.2倍（R2=0.85）。溶出的总氮中有机氮占80%。由于铁和铝的高积累潜力和对污泥增溶的负面影响，污水和污泥中的高水平铁和铝在污泥臭氧化-磷结晶高级污水处理工艺的应用中应谨慎考虑。
The behavior of inorganic elements (including phosphorus, nitrogen, and metals) during sludge ozonation was investigated using batch tests and the effects of metals on sludge solubilization were elucidated. A decrease of ∼50% in the ratio of sludge solubilization was found to relate to a high iron content 80–120mgFe/gSS than that of 4.7–7.4mgFe/gSS. During sludge ozonation, the pH decreased from 7 to 5, which resulted in the dissolution of chemically precipitated metals and phosphorus. Based on experimental results and thermodynamic calculation, phosphate precipitated by iron and aluminum was more difficult to release while that by calcium released with decrease in pH. The release of barium, manganese, and chrome did not exceed 10% and was much lower than COD solubilization; however, that of nickel, copper, and zinc was similar to COD solubilization. The ratio of nitrogen solubilization was 1.2 times higher than that of COD solubilization (R2=0.85). Of the total nitrogen solubilized, 80% was organic nitrogen. Because of their high accumulation potential and negative effect on sludge solubilization, high levels of iron and aluminum in both sewage and sludge should be considered carefully for the application of the advanced sewage treatment process with sludge ozonation and phosphorus crystallization.