| 膨润土调质对污泥堆肥的脱毒及重金属钝化和雌酮消除作用 |
| 摘要点击 2213 全文点击 688 投稿时间：2017-01-04 修订日期：2017-02-08 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 污泥堆肥 膨润土 调质 重金属钝化 雌酮 |
| 英文关键词 sewage sludge compost bentonite amendment heavy metal passivation estrone |
|
| 中文摘要 |
| 利用干基添加比例为0~10%钙基膨润土对污泥进行了调质，通过52 d的好氧堆肥研究了调质对堆体温度、pH、水溶性盐分（EC）、有机碳、总氮、铵态氮（NH4+-N）、硝态氮（NO3--N）的影响，并进一步分析了其对污泥脱毒（种子萌发）和重金属（Zn、Cu、Pb、Cd）钝化及雌酮（E1）消除的影响.结果表明，污泥经外加膨润土调质后，可以促进堆肥物料的热灭活无害化，能使有机碳矿化率达到15.27%~19.71%；堆肥过程中各处理堆肥pH先降低后升高，最终稳定在6.76~7.05之间，但膨润土调质堆肥pH的波动变缓；添加膨润土的堆肥EC显著低于对照处理（1132 μS·cm-1），整个堆肥过程EC值随着膨润土添加比例的增加而稍有降低.堆肥过程中的总氮含量逐渐增加，但对照处理在堆肥初期存在一定的氮素损失，而污泥经过调质可减少堆肥初期氮素损失；整个堆肥中NH4+-N含量先增加后降低，各处理NO3--N均呈现出逐渐增加的趋势，表明污泥调质促进NO3--N的转化.虽然调质对种子发芽产生一定的抑制作用，但均不影响堆肥的腐熟，且能显著促进重金属的钝化，同时添加膨润土处理显著降低堆料E1含量，添加比例5%处理使E1含量由90.48 μg·kg-1降低至28.27 μg·kg-1.研究表明，膨润土不高于5%的添加比例是适合的污泥调质措施，在污泥堆肥物料的安全化、脱毒及重金属钝化和雌酮消除方面具有较好的应用潜力. |
| 英文摘要 |
| Sewage sludge was amended with calcium-based bentonite with addition of no more than 10% in dry weight during the 52-day aerobic composting process, the variations of temperature, pH, organic carbon, EC, total nitrogen, nitrate(NH4+-N) and ammonium(NO3--N) were investigated, as well as the compost detoxification(germination test), heavy metals(Zn, Cu, Pb, Cd) passivation and estrone(E1) elimination. The results showed that the amendment facilitated the thermophilic phase, promoted the compost heat inactivation and brought the organic carbon mineral up to more than 15.27% -19.71%. During the composting, the compost pH increased at the beginning and then gradually decreased before reaching values of 6.76-7.05, while the amendments alleviated the dramatic pH value fluctuation. The bentonite amendment reduced the salinity of the compost with final product EC remarkably lower than 1132 μS·cm-1 of the control treatment, and the effect was enhanced with the increase of addition amount. The total nitrogen content increased with time, and there was a remarkable ammonia loss in the beginning stage for the control treatment, while the bentonite addition could facilitate the total nitrogen content increase by reducing the ammonia loss. With the composting variation, the contents of NH4+-N increased and then decreased while the NO3--N content increased gradually. The bentonite addition had a slight inhibitory effect on the plant germination but did not influence the compost maturity and detoxification; meanwhile, the amendment improved the heavy metal passivation and reduced the E1 content, especially from 90.48 to 28.27 μg·kg-1 with 5% treatment during the composting. The study indicated that bentonite addition of lower than 5% was acceptable for the sludge compost amendment, which had great potential in sludge hygienization, detoxification, heavy metal passivation and E1 elimination. |
|
|
|
