| 基于污泥资源化利用的粗放型绿色屋顶生长基质的组成 |
| 摘要点击 1989 全文点击 693 投稿时间：2017-01-23 修订日期：2017-02-20 |
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| 中文关键词 海绵城市 粗放型绿色屋顶 生长基质 出水水质 模拟降雨 厌氧稳定污泥 |
| 英文关键词 sponge city extensive green roof substrate effluent quality artificial rainfall anaerobic digested sludge |
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| 中文摘要 |
| 构建了8个不同基质组成的粗放型绿色屋顶小试装置，通过累积650 mm模拟降雨实验，研究厌氧稳定污泥应用于粗放型绿色屋顶生长基质时的合理组成，考察使用过程中装置出水水质情况与基质自身营养物质含量变化情况，结合厌氧稳定污泥资源化利用时带来的N、P淋出问题，讨论不同改良材料的效果.结果表明：厌氧稳定污泥能够显著增加植物量，实验期间植物平均增重808%；厌氧稳定污泥会造成TP的大量淋失，给水厂污泥能够有效控制TP淋失并且不会影响植物对P的吸收，实验期间给水厂污泥累计减少TP淋出质量68.66%，且稳定后出水TP达到地表水Ⅴ类标准；厌氧稳定污泥会造成TN的严重淋失，淋失TN的主要形态是NO3--N，稻壳炭能够减少NO3--N的淋失，累计减少NO3--N淋出质量28.86%，增加稻壳炭用量，有助于控制NO3--N淋出；淋出液中SS和COD能够迅速下降并稳定，稳定后COD含量约为30 mg·L-1，优于地表水Ⅴ类标准；在以中小降雨为主的实际降雨条件下，基质中厌氧稳定污泥所含营养物质的保留时间能超过1 a，可以满足植物较长时间的生长需求. |
| 英文摘要 |
| The experiment was carried out to study the reasonable composition of stable anaerobic sludge in the extensive green roof growth substrate by a total of 650 mm artificial rainfall event. Combined with the N, P leaching problem of the sludge resources utilization, the quality of the effluent and the change of the nutrient content of the substrate in the process of application were investigated. The results showed that the anaerobic sludge could significantly increase the plant biomass and the average weight gain was 808%. Stable anaerobic sludge caused a large amount of leaching of TP and water treatment residual could effectively control TP leaching and did not affect the absorption of P to the plant. During the experiment, the TP of the effluent was reduced by 68.66%.After stabilization, the effluent TP reached the surface water Ⅴ standard. The main form of leached TN was NO3--N and the leaching of NO3--N could be reduced by rice husk charcoal. In the experiment, the NO3- -N leaching mass was reduced by 28.86% totally. Increasing the amount of rice husk charcoal helped to control NO3--N leaching. SS and COD could be quickly decreased and stabilized. The COD of effluent after stabilization was about 30 mg·L-1, which was better than the standard of surface water Ⅴ. Under the condition of actual precipitation with medium and small rainfall, the anaerobic sludge nutrient retention time should be more than 1 year, which meets the growing needs of plants for a long time. |
