共查询到18条相似文献,搜索用时 62 毫秒
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通过分析膜生物反应器中铁含量对活性污泥性能的影响,得知在一定条件下,随着污泥中铁含量的升高,污泥的脱氢酶活性随之上升,上清液含铁量对污泥脱氢酶活性的影响跟污泥中含铁量影响相反;污泥含铁量对污泥比耗氧速率的影响与对脱氢酶活性的影响相反,其原因在于污泥浓度增加及污泥絮体变大影响了溶解氧和基质从反应器混合液向絮体内部的扩散,导致污泥内部氧气不足,从而使微生物的耗氧活性随之降低;随着上清液中铁含量的增加,污泥比耗氧速率随之升高,上清液中铁离子浓度的增高会使生物铁污泥性能劣化,导致生物铁污泥絮体的解絮,污泥颗粒变小,污泥内部溶解氧上升,从而使污泥耗氧活性增高,因此合理投加一定量的生物铁才能使污泥性能达到最佳。 相似文献
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膜生物反应器中影响膜透水率的几个因素 总被引:5,自引:3,他引:5
本文研究了影响膜 -好氧生物反应器中中空纤维膜透水率的几个因素 ,如组件长度、操作压力、膜面流速、活性污泥浓度和温度。中空纤维膜内 ,压力沿料液流动方向呈抛物线型分布 ,所以在膜内径和膜面流速一定的情况下 ,存在一个最佳的膜组件长度 Llin使得膜利用率最高 ,且最省能 ;操作压力对膜透水率的影响分为三个区域 ,各个区域膜的主要过滤阻力不同 ,不同污泥浓度时 ,为了使中空纤维膜内腔不堵塞 ,膜面流速必须高于某一范围 ,膜透水率随温度呈正比例关系变化。 相似文献
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文章研究了用MBR处理生活污水时曝气时间对生活污水中的COD,NH3-N,TP和SS的去除效果的影响,同时对比了膜出水和上清液的实验数据。实验结果表明:7h以后系统对COD、氨氮等的去除趋于稳定。同时发现膜对氨氮截留效果不明显。调整合适的操作参数,其对生活污水中的COD,NH3.N,TP和SS的去除率分别可以达到85%、87%、67%和98%以上,操作简单,出水水质稳定,有很强的推广意义。 相似文献
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膜生物反应器处理聚氯乙烯工业废水的实验室研究 总被引:2,自引:1,他引:1
采用聚丙烯中空纤维微滤膜生物反应器(MBR)对聚氯乙烯工业废水进行了实验室研究,讨论了废水的停留时间(HRT)、活性污泥浓度(MLSS)和曝气量(Q)等对废水化学需氧量(COD)和固体悬浮物(SS)去除效果的影响,结果表明采用MBR处理聚氯乙烯工业废水较适宜的操作条件为:停留时间(HRT)≥24h,活性污泥浓度(MLSS)10g/L,曝气量(Q)0.4m^3/h,温度25℃,MBR处理过的聚氯乙烯工业废水的出水COD和SS分别可达16mg/L和5mg/L,COD和SS去除率在90%以上. 相似文献
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《分离科学与技术》2012,47(7):1447-1466
Abstract The effect of powdered activated carbon (PAC) addition to the activated sludge (AS) in a membrane bioreactor (MBR) has been investigated. The long term nature of the tests allowed the PAC to gradually incorporate into the biofloc forming biologically activated carbon (BAC). One series of tests involved 4 bench scale (2 L) MBRs operated at sludge retention times (SRTs) of 30 days with PAC inventories of 0, 1, 3 and 5 g/L and steady state biomass concentrations of 12.0±1.0 g/L. The characteristics of the mixed liquors (MLSS) from the 4 reactors were compared. Short term filtration tests, including measurement of specific cake resistance (SCR), flux decline profile, and irreversible fouling resistance in an unstirred cell and “sustainable” flux (by monitoring transmembrane pressure (TMP) rise) in a crossflow cell all showed better filtration performance for the MLSS with BAC compared with the AS alone. In terms of SCR and flux decline profile the 1 g/L PAC addition performed best, but in terms of minimizing irreversible membrane fouling and maximizing “sustainable” flux the 5 g/L PAC was best. All 4 systems showed lower total organic carbon (TOC) in the permeate compared to the bioreactors, but the lowest permeate TOC (and the best removal) was for the highest PAC loading. The benefit of PAC addition was confirmed in a second series of tests with two 20 L MBRs with submerged hollow fibers, one operated without PAC, the MBR(AS), and the other with 5 g/L PAC, the MBR(BAC). For an SRT of 30 days (which involved 3.3% sludge wastage per day and 3.3% new PAC addition per day) and a fixed flux of 21 L/m2hr the MBR(AS) showed a TMP rise of about 2.4 kPa/day whereas the MBR(BAC) showed a rise of only 0.8 kPa/day. However when the MBRs were operated without wastage the performance of the MBR(BAC) was worse than the MBR(AS). Thus the improved performance of the MBR(BAC) requires regular replenishment of aged BAC with fresh PAC. 相似文献
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文章主要介绍了一体式膜生物反应器(MBR)设备的调试运行。因设备中的关键部件——膜组件的存在与工艺的独特性——污泥不回流及微生物处于内源呼吸区;在调试过程孛为有效防止膜通量下降与达到出水水质标准;使得一体式膜生物反应器设备的调试与传统活性污泥处理工艺有所不同。 相似文献