Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China.
Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China.
Chemosphere. 2019 Mar;218:42-51. doi: 10.1016/j.chemosphere.2018.11.103. Epub 2018 Nov 16.
Composting is a major sludge-treatment method and bulking agents are very important in sludge composting. In this study, ceramsite and activated alumina balls were chosen as recyclable bulking agents for sludge composting. Variations in the temperature, pH, electrical conductivity, organic matter, dissolved organic carbon, moisture content, and heavy metals were detected during composting with different bulking-agent treatments as well as differences in the germination index values. The results showed that both bulking agents could ensure the maturity of the compost; further, ceramsite treatment resulted in the best water removal efficiency. According to the sequential extraction procedure, both ceramsite and activated alumina balls could stabilize Cd but they also increased the mobility of Zn. After comparing the effects of different particle sizes of ceramsite on composting, 20 mm was determined to be the most optimal value. Additionally, the recovery rates of ceramsite and activated alumina balls were 96.9% and 99.9%, respectively.
堆肥是一种主要的污泥处理方法，而膨胀剂在污泥堆肥中非常重要。在这项研究中，选择陶粒和活性氧化铝球作为可回收的污泥堆肥膨胀剂。在不同膨胀剂处理的堆肥过程中，检测到温度、pH 值、电导率、有机物、溶解有机碳、水分含量和重金属的变化，以及发芽指数值的差异。结果表明，两种膨胀剂都能保证堆肥的成熟度；进一步的，陶粒处理的脱水效果最好。根据顺序提取程序，陶粒和活性氧化铝球都可以稳定 Cd，但它们也增加了 Zn 的迁移率。在比较不同粒径的陶粒对堆肥的影响后，确定 20mm 为最优选值。此外，陶粒和活性氧化铝球的回收率分别为 96.9%和 99.9%。
