小球藻强化餐厨废水处理效果及机理

利用小球藻对混凝出水进行处理,考察小球藻接种量对COD、DTP和TN去除率的影响,通过扫描电子显微镜(SEM)、红外光谱、比表面积微孔分析仪分析小球藻形貌和组成结构的变化,采用紫外可见光谱和三维荧光光谱研究餐厨废水中有机物成分的变化,探究小球藻降解餐厨废水的机理.结果表明:当小球藻接种量为25%时,COD和TN去除率最高(分别为79.73%和78.28%);当小球藻接种量为35%时,DTP去除率最高(85.55%).反应前的小球藻细胞表面相对光滑,反应后的小球藻细胞表面粗糙,比表面积增大,并粘附大量颗粒态物质;小球藻细胞表面的羧基、氨基和磷酸基团等官能团参与污染物的吸附沉淀;小球藻破坏了腐殖质结构,降低了腐殖质芳香性;小球藻在降解可溶性微生物副产物和类腐殖酸的同时,产生芳香类蛋白物质.

Effect and mechanism of C.vulgarisintensified treatment of kitchen wastewater

Chlorellavulgaris(C.vulgaris) was used to treat the coagulation effluent and the effects of C.vulgaris inoculation amount on the removal efficiencies of COD, DTP and TN were investigated. The changes of morphology and structure of C.vulgaris were analyzed using the scanning electron microscope (SEM), infrared spectroscopy and specific surface area micropore analyzer. The component changes of organic matters in kitchen wastewater were studied using ultraviolet visible spectrum and three-dimensional fluorescence spectrum. Mechanism of C.vulgaris degrading kitchen wastewater was explored. The results showed that when the inoculation amount of C.vulgaris was 25%, the removal efficiencies of COD and TN were the highest (79.73% and 78.28%, respectively), while the highest DTP removal efficiency (85.55%) was achieved at the inoculation amount of 35%. Before inoculation, the surface of C.vulgaris cells was relatively smooth, while it became rougher after application. The specific surface area of C.vulgaris increased with the attachment of a large amount of particulate matters. The carboxyl, amino and phosphate groups on the surface of C.vulgaris cells involved in the adsorption and precipitation of the pollutants. C.vulgaris destroyed the structure of humus and reduced the aromaticity of humus. Aromatic protein substances were produced when C.vulgaris degraded the soluble microbial by-products and humic acids.