Abstract: In order to further explore the effect of calcium peroxide additive on the harmless effect of aerobic composting of cabbage waste, cabbage waste was used as the main raw material, rice bran and pig manure were used as auxiliary materials, and mixed composting was carried out. Four calcium oxide addition treatments of 0(CK), 5%, 10%, and 20% were set up to determine the composting temperature and the organic matter content, total nitrogen content, maturity index (pH, seed germination index and conductivity) and harmless index (fecal coliform group and roundworm eggs) of the product. The results showed that the addition of calcium peroxide was beneficial to the increase of the accumulated temperature of the cabbage composting. The addition of 5% and 10% calcium peroxide could increase the maximum temperature of the compost, but the addition of 20% calcium peroxide would reduce the maximum temperature of the compost. The addition of calcium peroxide was beneficial to the degradation of organic matter. At the end of composting, the organic matter content of the calucium peroxide addition treatments was 22.6%-66.7% lower than that of CK. The addition of calcium peroxide was beneficial to the maturity of compost, and the seed germination index reached the maturity requirement (>70%). However, only adding 20% calcium peroxide could make the fertilizer meet the requirements of harmlessness, and the number of fecal coliforms was 24 per gram. In summary, if it was to make the cabbage compost meet the maturity requirements, taking into account the cost, it was recommended to add 5% calcium peroxide to the compost; if it was to make the cabbage compost to achieve harmless requirements, it was recommended to add 20% calcium peroxide.

Key words: composting conditioner, calcium peroxide, cabbage waste, aerobic composting, maturity, harmlessness, seed germination index, number of fecal coliforms