| 基于微气泡曝气的生物膜反应器处理废水研究 |
| 摘要点击 4639 全文点击 1862 投稿时间：2012-09-26 修订日期：2012-12-17 |
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| 中文关键词 微气泡曝气 SPG膜 生物膜反应器 废水生物处理 |
| 英文关键词 microbubble aeration SPG membrane biofilm reactor biological wastewater treatment |
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| 中文摘要 |
| 微气泡曝气有助于强化氧传质过程,在废水好氧生物处理中具有潜在的应用优势; 生物膜反应器是应用微气泡曝气的可行工艺形式. 本研究在生物膜反应器中采用SPG膜微气泡曝气处理模拟生活废水,探讨反应器连续运行过程中,SPG膜空气通透性、溶解氧变化、污染物去除效果及氧利用情况. 结果表明,基于SPG膜微气泡曝气的生物膜反应器能够实现长期连续稳定运行,是微气泡曝气与废水好氧生物处理结合的可行方式. SPG膜表面性质及膜孔径影响其空气通透性,疏水性膜的空气通透性优于亲水性膜; 膜孔径越大,空气通透性越好. 一定的SPG膜空气通量下,反应器内的溶解氧浓度主要受有机负荷影响. SPG膜微气泡曝气生物膜反应器较优的COD处理负荷(以SPG膜面积计算)为6.88 kg·(m2·d)-1. 氨氮的去除主要受溶解氧浓度及生物膜内氧扩散传质的影响,在高有机负荷下生物膜内出现同步硝化反硝化. 微气泡曝气的氧利用率显著高于传统曝气方式,在优化的运行条件下,氧利用率可以接近100%. |
| 英文摘要 |
| Microbubble aeration is supposed to be able to provide potential advantage for aerobic biological wastewater treatment due to enhancement of oxygen mass transfer. Biofilm reactor is considered to be feasible for application of microbubble aeration. Shirasu porous glass (SPG) membrane was used for microbubble aeration in a biofilm reactor to treat synthetic municipal wastewater. The air permeability of SPG membranes, dissolved oxygen (DO) concentration, pollutant removal and oxygen utilization were investigated during the continuous operation of the bioreactor. The long-term stable continuous operation of the experimental system demonstrated the successful application of microbubble aeration in aerobic wastewater treatment processes. The air permeability of SPG membranes was influenced by its surface wettability and pore size. The air permeability of hydrophobic membrane was better than that of hydrophilic membrane. The air permeability could also be improved by increasing the pore size. DO concentration was affected by organic loading mainly at a certain air flux. The optimal SPG membrane area-based COD removal capacity of the experimental system was determined as 6.88 kg·(m2·d)-1. NH4+-N removal was mainly affected by DO concentration and its diffusion inside the biofilm. The simultaneous nitrification and denitrification was observed at a high organic loading rate. The oxygen utilization was much more efficient in microbubble aeration, compared to traditional bubble aeration, and it might be close to 100% at optimal running conditions. |
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