Abstract：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.
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