| 基于能源回收的城市污水厌氧氨氧化生物脱氮新工艺 |
| 摘要点击 4211 全文点击 1994 投稿时间：2012-07-13 修订日期：2012-08-21 |
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| 中文关键词 甲烷化 半亚硝化 厌氧氨氧化 CH4回收 低碳 生活污水 新工艺 |
| 英文关键词 methanogenesis partial nitritation ANAMMOX CH4 reclaiming low carbon domestic sewage new process |
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| 中文摘要 |
| 采用" 甲烷化+半亚硝化+厌氧氨氧化自养脱氮" 新工艺,实现了生活污水能源质回收及氮素低碳化去除. 结果表明,联合工艺出水NH4+-N≈0, NO2--N≤0.5 mg·L-1,NO3--N平均为3.6 mg·L-1,溶解性COD＜10 mg·L-1,去除率高达98%. 其中采用升流式厌氧污泥固定床(UAFB)实现甲烷化,能去除80%以上的进水溶解性COD,甲烷平均日产气量为3.3 L,产气量与COD去除量之间的关系为0.3 L·g-1,39.2%的进水溶解性COD转化为CODCH4,只有6.52%转化为CODVFAs. 采用序批式反应器(SBR)实现半亚硝化,亚硝化累积率达到97%,出水基本达到厌氧氨氧化进水基质配比(NH4+-N∶NO2--N=1∶1.13),半亚硝化的主要作用是转化NH4+-N,转化率为36.59%. 厌氧氨氧化(ANAMMOX)反应器氨氮去除量、亚硝态氮去除量和硝态氮生成量之比为1∶1.18∶1.25,总氮容积去除负荷为0.62 kg·(m3·d)-1,对氮素去除的贡献率为56.91%,为氮素脱除的主导工艺环节. 新工艺通过厌氧产甲烷实现能源质回收,并通过亚硝化-厌氧氨氧化实现自养脱氮,为现有城市污水处理厂工艺改造提供了一种新的思路和技术. |
| 英文摘要 |
| Using a innovative system consisted of methanogenesis,partial nitritation and anaerobic ammonium oxidation (ANAMMOX) reactors, simultaneous methane production and autotrophic nitrogen removal from domestic sewage was successfully achieved. The results showed that the effluent NH4+-N of the combined treatment process was below the detection limit. The effluent NO3--N and NO2--N were less than 0.5 mg·L-1 and 3.6 mg·L-1, respectively. The effluent COD of the combined treatment process was 10 mg·L-1 and a COD removal rate of 98% was achieved. More than 80% COD was removed by the up-flow anaerobic sludge fixed bed (UAFB) and the anaerobic gas production was 3.3 L·d-1 with a methane yield of 0.3 L·g-1. About 39.2% of influent COD was removed in form of methane and about 6.52% was transferred to VFAs. Partial nitritation with high nitrite accumulation efficiency of 97% was realized in a Sequencing Batch Reactor (SBR). Ammonium was partly oxidized to nitrite with an ammonium∶nitrite ratio of 1∶1.13, which was suitable for the sub-sequent ANAMMOX reaction. In terms of N balance, the N conversion rate of SBR was 36.59% while the anaerobic ammonium oxidation (ANAMMOX) reactor, which was the major system in nitrogen removal, removed 56.91% of N. The TN removal rate of the ANAMMOX reactor was 0.62 kg·(m3·d)-1 and the ratio of NH4+-N removal∶NO2--N removal∶NO3--N generation was 1∶1.18∶1.25. The new process achieves energy recovery by reclaiming methane and autotrophic nitrogen removal by the partial nitritation-ANAMMOX process, and provides a new approach and technology for reforming of domestic wastewater treatment plants. |
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