菌剂和含磷添加剂联合添加对污泥堆肥污染气体排放及堆肥品质的影响

The effect of microbial agent and phosphorus-containing additives on compost maturity and pollutant gas emissions during sewage sludge composting

以脱水污泥和玉米秸秆堆肥为对照,采用实验室规模系统,研究了外源添加微生物菌剂(VT菌剂)和含磷添加剂(过磷酸钙和磷石膏)对污泥堆肥腐熟度、污染气体排放以及产品品质的影响。结果表明:菌剂添加显著促进堆肥腐熟,最终种子发芽率指数为126%~158%。菌剂和两种含磷添加剂混合添加可更大程度降低污染气体的排放,其中菌剂和过磷酸钙联合添加可减少63.3%的NH_(3)和42.8%的H_(2)S排放量,菌剂和磷石膏联合添加可减少97.6%的NH_(3)和54.4%的H_(2)S排放量。添加剂处理均可降低CH_(4)的排放。添加菌剂可以降低30.7%的N_(2)O排放,但是菌剂与过磷酸钙和磷石膏联合添加会增加堆肥前期的N_(2)O排放。含磷添加剂处理可提高18.3%~22.9%的总养分(TN+P_(2)O_(5)+K_(2)O)含量。研究表明,VT菌剂和含磷添加剂联合使用是提高堆肥产品品质、减少堆肥过程污染气体排放的有效方法。

The effects of VT microbial agents and phosphorus-containing additives(superphosphate and phosphogypsum)on compost maturity and gas emission during dewatered sludge and corn stalk composting was investigated in a laboratory-scale system.The results showed that microbial agent addition had a higher final germination index(GI),(126%~158%),which significantly promoting compost maturity.The microbial agent combined with superphosphate reduced NH_(3) and H_(2)S emissions by 63.3%and 42.8%,respectively.The combined addition of a microbial agent and phosphogypsum reduced NH_(3) and H_(2)S emissions by 97.6%and 54.4%,respectively.All additive treatments reduced CH_(4) emissions and microbial agent addition reduced N_(2)O emissions by 30.7%.However,combined addition of the microbial agent with superphosphate or phosphogypsum increased N_(2)O emissions in the early stage of composting.Two treatments involving phosphorus additives increased the total nutrient content(TN+P_(2)O_(5)+K_(2)O)from 18.3%to 22.9%.Therefore,combined addition of the VT microbial agent and phosphorus-containing additives is an effective method for improving the compost maturity and reducing pollutant gas emissions.