| 优化好氧发酵木屑添加量提升污泥再利用潜力 |
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| 引用本文： | 王洁洁,杨金艳,陈步涨,姚波,裴建川,李梅,钟铃,方宇斐.优化好氧发酵木屑添加量提升污泥再利用潜力[J].浙江农林大学学报,2022,39(3):662-670. |
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| 作者姓名： | 王洁洁 杨金艳 陈步涨 姚波 裴建川 李梅 钟铃 方宇斐 |
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| 作者单位： | 1.浙江农林大学 环境与资源学院，浙江 杭州 3113002.浙江农林大学 水污染防治研究所，浙江 杭州 311300 |
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| 基金项目： | 浙江省科技厅公益技术应用研究项目(2017C33104)；浙江省科技厅公益技术委托项目(H20200210) |
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| 摘 要： | 目的 为了提升污泥在园林绿化方面的应用潜力，探讨填埋污泥发酵时最佳的木屑添加量，以期为工程应用提供参考。 方法 以杭州地区某填埋池污泥为主要原料，基于不同碳氮比(20、25、30)控制木屑添加量，分别配制了T1、T2、T3共3组发酵物料处理，通过间歇式好氧发酵，分析了发酵过程中温度、pH、电导率、氮、磷、钾和重金属形态等理化指标的变化。 结果 发酵为典型中温发酵(30~45 ℃)，发酵过程中不同木屑添加量之间温度呈现差异显著(P＜0.05)，pH呈先升高后降低趋势，受木屑添加量影响显著(P＜0.05)；电导率受木屑添加量影响较小。发酵结束后，3组处理铵态氮损失率分别为30%、47%、42%，硝态氮增加了8.25、6.27、3.85倍，说明木屑添加量对氮素影响大。总磷增长率分别为7.0%、11.8%、10.8%，有效磷占比为8%、9%、9%，总钾占比为27%、36%、44%，有效钾占比为8%、12%、17%，其中仅T1和T2之间总钾呈现显著差异(P＜0.05)。铜的生物有效态分配率分别从初始的32%、38%、40%增加至72%、74%、74%，生物可利用态锌分别从84%、85%、86%增加至96%、98%、97%；不同木屑添加量下，生物有效态、可氧化态铜、锌分别呈显著差异(P＜0.05)；3组发酵物对植物生长均无毒性种子发芽指数(IG＞80%)]，但T2毒性显著大于T3毒性(P＜0.05)。 结论 发酵过程pH、氮、钾、生物可利用态铜、稳定态锌和种子发芽指数受木屑添加量显著影响(P＜0.05)，3组处理所检测的指标均符合GB/T 23486—2009《城镇污水处理厂污泥处置 园林绿化用泥质》碱性土壤用泥限值标准，其中T2处理的木屑添加量对发酵过程控制最具参考价值。图6表4参27
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| 关 键 词： | 填埋污泥 木屑 碳氮比 好氧发酵 |
| 收稿时间： | 2021-04-28 |
Optimal addition of aerobic fermentation sawdust in landfill sludge reuse |
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| WANG Jiejie,YANG Jinyan,CHEN Buzhang,YAO Bo,PEI Jianchuan,LI Mei,ZHONG Ling,FANG Yufei.Optimal addition of aerobic fermentation sawdust in landfill sludge reuse[J].Journal of Zhejiang A&F University,2022,39(3):662-670. |
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| Authors: | WANG Jiejie YANG Jinyan CHEN Buzhang YAO Bo PEI Jianchuan LI Mei ZHONG Ling FANG Yufei |
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| Institution: | 1.College of Environment and Resources, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China2.Water Pollution Prevention and Control Institute, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China |
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| Abstract: | Objective The objective is to explore the optimal amount of sawdust during landfill sludge fermentation so as to improve the potential of sludge in landscaping. Method Three groups of fermentation materials, i.e. C/N20(T1), C/N25(T2), and C/N30(T3), were prepared by using sludge from a landfill in Hangzhou as the main raw material and sawdust as a conditioning agent. Through batch aerobic fermentation, the changes of physical and chemical indicators such as temperature, pH, conductivity, nitrogen, phosphorus, potassium and heavy metal forms were analyzed. Result The fermentation was a typical medium temperature fermentation (30~45 ℃). During the fermentation process, there was a significant difference in temperature between different sawdust additions (P＜0.05), and the pH increased first and then decreased, which was significantly affected by sawdust amount while the conductivity was less affected. The ammonium nitrogen loss rates for T1, T2 and T3 after the fermentation were 30%, 47%, and 42%, respectively, and the nitrate nitrogen rates increased by 8.25, 6.27, and 3.85 times, indicating that the addition of sawdust had a great impact on nitrogen. The growth rates of total phosphorus for T1, T2 and T3 were 7.0%, 11.8%, and 10.8%, respectively, and the proportions of available phosphorus were 8%, 9%, and 9%, respectively. The growth rates of total potassium were 27%, 36%, and 44%, and the proportions of available potassium were 8%, 12%, and 17%, respectively, among which there was a significant difference in total potassium between T1 and T2 (P＜0.05). The bioavailability of Cu for T1, T2 and T3 increased from 32%, 38%, and 40% to 72%, 74%, and 74%, and the bioavailability of Zn for T1, T2 and T3 increased from 84%, 85%, and 86% to 96%, 98%, and 97%, respectively. There were significant differences in bioavailable and oxidized Cu and Zn under different sawdust addition levels (P＜0.05). The fermentation products of the three groups had no toxicity to plant growth (IG＞80%), but the toxicity of T2 was significantly greater than that of T3 (P＜0.05). Conclusion The pH, nitrogen, potassium, bioavailable Cu, stable Zn, and seed germination index in the fermentation process are significantly affected by the amount of sawdust (P＜0.05). The indicators of the three treatments are all in line with the GB/T 23486?2009 limit standard for argillaceous alkaline soil for landscaping, of which T2 has the most reference value for sawdust control in fermentation process. Ch, 6 fig. 4 tab. 27 ref.] |
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