排序方式: 共有37条查询结果,搜索用时 31 毫秒
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兼性生化处理生活污水最佳工况研究 总被引:3,自引:0,他引:3
在常温条件下进行兼性生化处理生活污水试验,研究COD去除率与HRT、MLSS、进水有机物浓度和混合液水温的关系。在试验中最佳的水平搭配为MLSS=5500mg/L,进水有机物浓度=180mg/L,HRT=8h和混合液水温=20℃,与回归分析所得出MLSS=5881mg/L,进水有机物浓度=192.7mg/L,HRT=8.9063h和混合液水温=21.3790℃的最佳工艺条件相吻合。最后通过等高线分析得出常温下生活污水兼性生化的适宜范围。 相似文献
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Sludge concentration dynamic distribution and its impact on the performance of UNITANK 总被引:2,自引:0,他引:2
UNITANK is a biological wastewater treatment process that combines the advantages of traditional activated sludge process and sequencing batch reactor, which is divided into Tank A, B and C. In this study, the sludge distribution and its impact on performance of UNITANK were carried out in Liede Wastewater Plant (WWTP) of Guangzhou, China. Results showed that there was a strong affiliation between Tank A and B of the system in sludge concentration distribution. The initial sludge concentration in Tank A could present the sludge distribution of the whole system. The sludge distribution was mainly influenced by hydraulic condition. Unsteady sludge distribution had an impact on variations of substrates in reactors, especially in decisive reactor, and this could lead to failure of system. Settler could partially remove substrates such as COD and NO3-N, but there was adventure of sludge deterioration. The rational initial sludge concentration in Tank A should be 4000-6000 mg/L MLSS. 相似文献
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Removal of inorganic nitrogen (inorganic-N) from toilet wastewater, using a pilot-scale airlift external circulation membrane bioreactor (AEC-MBR) was studied. The results showed that the use of AEC-MBR with limited addition of alkaline reagents and volumetric loading rates of inorganic-N of 0.19-0.40 kg inorganic-N/(m3·d) helped achieve the desired nitrification and denitrification. Furthermore, the effects of pH and dissolved oxygen (DO) on inorganic-N removal were examined. Under the condition of MLSS at 1.56-2.35 g/L, BOD5/ammonia nitrogen (NH/-N) at 1.0, pH at 7.0-7.5, and DO at 1.0-2.0 mg/L, the removal efficiencies of NH4 -N and inorganic-N were 91.5% and 70.0%, respectively, in the AEC-MBR. The cost of addition of alkaline reagent was approximately 0.5-1.5 RMB yuan/m3, and the energy consumption was approximately 0.72 kWh/m3 at the flux of 8 L/(m2·h). 相似文献
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溶解氧及活性污泥浓度对同步硝化反硝化的影响 总被引:53,自引:1,他引:52
文章研究溶解氧及活性污泥浓度对同步硝化反硝化效率的影响。研究结果表明:在一定DO范围内,随着反应器内溶解氧浓度的降低,总氮去除率呈上升趋势,即好氧反硝化效率随溶解氧浓度的降低而提高;在一定MLSS范围内,反应器内混合液污泥浓度越高,出水总氮越低,反硝化现象越明显。 相似文献
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泥水预分离MBR膜污染缓减效能研究 总被引:1,自引:0,他引:1
通过长期运行实验,进行了泥水预分离膜生物反应器(sludge/water pre-separation membrane bioreactor, S/W-MBR)与传统淹没式膜生物反应器(submerged membrane bioreactor, SMBR)对比研究,考察了污泥浓度、胞外聚合物含量(extracellular polymeric substances, EPS)及过膜阻力(trans-membrane pressure, TMP)随运行时间的变化规律及其对膜污染的缓减作用.结果表明,S/W-MBR与SMBR生物区的污泥浓度基本一致,而S/W-MBR膜区的污泥浓度较SMBR有显著降低.两者生物区的EPS含量均随运行时间的延长而增加,而S/W-MBR膜区的单位质量污泥的EPS含量始终保持在15 mg/g左右的较低水平.S/W-MBR比SMBR具有更好的缓减膜污染能力,在近90d的连续运行过程中,前者的膜组件仅需清洗2次,后者的膜组件清洗了5次. 相似文献
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本研究进水模拟了污泥消化液、晚期垃圾渗滤液等高氨氮低碱度低碳氮比的废水,在碱度缺乏(不足以实现完全短程硝化)条件下获得了稳定的半短程硝化,并通过曝气量和污泥浓度(MLSS)双因素调控,实现了半短程硝化的高效经济运行.研究表明,进水碱度缺乏条件下短程硝化体系出水亚硝氮/氨氮浓度比值y与进水HCO3-∶NH4+物质的量的比x之间存在化学计量关系 y=x/(2-x),当进水HCO3-∶NH4+物质的量的比为1,即进水碱度/氨氮浓度(mg·L-1)比值为3.6时可实现半短程硝化,并通过游离氨(FA)和游离亚硝酸(FNA)联合抑制能够实现稳态运行,亚硝酸盐积累率平均可达95%以上.实验探究了MLSS和曝气量对短程硝化反应器曝气经济性和氨氧化率的影响,通过平衡两因素作用,在保证处理效果的同时最大程度提升了反应系统的曝气经济性:当曝气量为36 L·h-1和MLSS为2243 mg·L-1时,反应器的曝气经济性较好,可节省约40%曝气量,且能维持较高的容积氨氮负荷(0.93 kg·m-3·d-1). 相似文献
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