Abstract: In order to promote the reduction and resource utilization of organic wastes in city， the composting effects with different proportions of sewage sludge and green plant wastes were studied. It was shown that different proportions of sewage sludge and green plant wastes significantly influenced composting effects. Compared with the treatments with ratios of 2∶3 and 3∶3， the treatment with ratios of 4.5∶3 in sewage sludge and green plant wastes promoted the temperature advancements， increased the maximum temperature and prolonged the high temperature period. Dissolved organic carbon and organic matter decreased in composting， and the degradation of treatments with ratios of 4.5∶3 and 6∶3 was significantly higher than those of 2∶3 and 3∶3. The relative content of total nitrogen accumulated after composting， and the accumulation of treatments with ratios of 4.5∶3 and 6∶3 were significantly higher than those of 2∶3 and 3∶3. However， the loss amount of absolute nitrogen in former treatments was higher than those of 2∶3 and 3∶3. Thus， the treatment with ratio of 4.5∶3 in sewage sludge and green plant wastes was suggested for the composting to maximize the treatment amount of both kinds of wastes and to get better composting effects.

Key words: sewage sludge, wastes, composting