玉米秸秆添加比例对污泥好氧堆肥质量的影响

Influence of Different Proportions of Sludge to Maize Straw Ratio on the Quality of Sludge Compost

为探讨不同物料配比对污泥堆肥质量的影响,将城市污泥和玉米秸秆按照(w/w,以干重计)0.5∶1、1∶1和2∶1的比例进行35 d高温好氧堆肥,研究了堆肥过程中温度、有机碳(TOC)、C/N、总氮(TN)、速效磷、速效钾、腐殖酸(HAs)和种子发芽率(GI)的变化规律。结果表明:3个处理堆体温度都能达到国家无害化标准;随着堆肥进行,有机碳和C/N逐渐下降,下降幅度与初始物料有机碳和C/N呈正相关;堆肥结束时,总氮和速效钾都有所增加;速效磷开始略有波动,最后呈增加趋势;腐殖酸(HAs)总量没有大幅增加;3个处理种子发芽率都不断提高,到堆肥结束时均达到60%以上;堆肥产品氮、磷、钾和腐殖酸含量随着污泥比例升高而增加。

The objective of this research is to investigate the influence of the proportion of maize straw on the quality of sewage sludge compost. Sewage sludge mixed with maize straw at three different ratios （0.5 ： 1, 1 ： 1, 2：1, w/w, dry weight） is aerobically composted for 35 d. During the composting process, temperature, organic carbon （TOC）, C/N, nitrogen（TN）, rapidly available P, rapidly available K, humic acids（HAs） and germination index（GI） were examined and analysed： The pile temperature of all treatments could reach the national harmless treatment standards. TOC and C/N decreased gradually, and the decreases were positively correlated to TOC and C/N of the initial materials. At the end of composting, TN and rapidly available K increased, HAs didn＇ t increase significantly, GI of all treatments increased to more than 60 %. Rapidly available P fluctuated in the beginning, and then increased. The results show that higher ratio of sewage sludge can produce better compost which has a higher lever of N, P, K, and HAs.