污泥臭氧减量化过程中氮溶出物的规律

以污泥臭氧减量化过程中含氮物质的转变为研究核心，分析了减量过程中不同形态氮溶出物随臭氧投量的变化，并利用线性回归方程归纳出污泥溶解过程中各形态含氮物质的溶出规律。结果表明：当臭氧投量在0.15 g O3·（g TSS）-1时，TN的增长速率最高，增幅达437.44%，此时MLSS减少了41.28%，可将0.15 g O3·（g TSS）-1视为臭氧最佳投量；XPS图谱显示，溶出的NH4+-N、NO3--N主要由污泥絮体中铵态氮和硝态氮的释放所致，而凯氏氮主要来源于胞内蛋白质-N（有机态凯氏氮）的溶出，在臭氧投量为0.30 g O3·（g TSS）-1时，凯氏氮占溶出TN的93.46%；最终建立TN关于ΔMLSS、臭氧投量D和臭氧浓度C的数学模型为TN=ΔMLSS·（0.000 96C+0.011 2）=e3.992·D0.774·C1.466·（0.000 96C+0.011 2），该模型应用范围为MLSS=4 000~5 000 mg·L-1，20 mg·L-1C-1，0.02 g O3·（g TSS）-1D3·（g TSS）-1。

Nitrogenous substances dissolving law during process of sludge ozone reduction

This study analyzed the transformation of nitrogenous substances during the process of sludge ozone reduction by examining the variations in different forms of nitrogen with ozone dosage. The dissolution law of each nitrogenous substance during the reduction process was determined by using a linear regression equation. The results indicate that when the ozone dosage was 0.15 g O3·g-1 total suspended solids (TSS), the total nitrogen (TN) increase rate reached the highest level at 437.44%, and mixed liquor suspended solids (MLSS) were reduced by 41.28%. Therefore, 0.15 g O3·(g TSS)-1 was regarded as the optimal ozone dosage. X-ray photoelectron spectroscopy (XPS) showed that the dissolved NH4+-N and NO3--N were created mainly by the release of ammonium as well as nitrate nitrogen in the sludge flocs and that Kjeldahl nitrogen was produced mainly from the dissolution of intracellular proteins, which accounted for 93.46% of dissolved TN at the ozone dosage of 0.30 g O3·(g TSS)-1. The TN mathematical model relevant to ΔMLSS and ozone concentration was determined to be TN=ΔMLSS ·(0.000 96 C+0.011 2)=e3.992·D0.774·C1.466·(0.000 96 C+0.011 2), and the range of application is MLSS=4 000-5 000 mg ·L-1, 20 mg ·L-1C-1, 0.02 g O3·(g TSS)-1D3·(g TSS)-1.