污泥停留时间对厌氧膜生物反应器处理餐厨废水效能的影响

发布时间：2018-04-09 16:18

本文选题：厌氧膜生物反应器　切入点：餐厨废水　出处：《环境工程学报》2016年11期

【摘要】：采用中试厌氧膜生物反应器(AnMBR)处理高浓度餐厨废水,多维分析污泥停留时间(SRT为50、30和20 d)对其运行效能的影响。结果显示,An MBR在各SRT工况下均展现出较好的稳定性,消化罐pH维持在7.2(7.8之间,膜出水COD去除率达到96%以上。缩短SRT虽然能够有效提高有机负荷,但是过低的SRT会显著降低COD转化率。An MBR在SRT 30 d工况下可获得最佳处理效能,有机负荷达到(8.7±1.3)kg COD·(m~3·d)~(-1),沼气生产强度达到(4.5±0.8)m~3·(m~3·d)~(-1),COD转化率为(82.1±7.3)%。厌氧消化液中胶体态和溶解性大分子有机质的累积是导致膜过滤效能下降的主要原因,控制SRT 30 d有效削减了其积累量,从而提高了膜通量并减缓了膜污染趋势。Ca~(2+)会沉积在污泥混合液中,其浓度随着SRT缩短显著降低。此外,SRT缩短会降低长链脂肪酸(LCFA)的转化率;但是未降解的LCFA很可能与Ca~(2+)形成沉淀,会减轻游离LCFA对微生物活性的抑制作用,进而有助于AnMBR的稳定运行。
[Abstract]:A pilot-scale anaerobic membrane bioreactor (AnMBR) was used to treat high concentration kitchen wastewater. The effects of sludge retention time (SRT) of 50 ~ 30 and 20 days on its operation efficiency were analyzed.The results showed that an MBR showed good stability under various SRT conditions. The pH of digesting tank was maintained at 7.2N 7.8, and the removal rate of COD in membrane effluent was over 96%.The accumulation of colloidal and soluble macromolecular organic matter in anaerobic digestible fluid was the main reason for the decrease of membrane filtration efficiency. The accumulation of macromolecular organic matter was effectively reduced by controlling SRT for 30 days.Thus the membrane flux was increased and the trend of membrane fouling was slowed down. Caan2) was deposited in the sludge mixture and its concentration decreased significantly with the shortening of SRT.
【作者单位】：江南大学环境与土木工程学院;江苏省水处理技术与材料协同创新中心;江苏省厌氧生物技术重点实验室;郑州侨联生物能源有限公司;
【基金】：国家自然科学基金资助项目(21276114,21506076) 国家科技支撑计划项目(2013BAB11B02,2014BAC25B01)
【分类号】：X799

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