共查询到19条相似文献,搜索用时 218 毫秒
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A/A/MBBR工艺处理混合污水的脱氮除磷中试研究 总被引:3,自引:2,他引:1
采用A/A/MBBR工艺处理由粪便液和生活污水组成的混合污水,试验条件:填料投配比为20%,好氧池1和好氧池2中的填料体积比为1:3,好氧池的水力停留时间为5 h,混合液回流比为120%,污泥回流比为60%,泥龄为6 d,好氧池的溶解氧为3.0 mg/L,温度为16~20℃.系统稳定运行一个月的结果表明:脱氮除磷效果及对有机物的去除效果均稳定而良好,出水氨氮、总氮、总磷和COD平均浓度分别为0.3、12.9、0.35和36.22 mg/L,均达到了国家一级A排放标准. 相似文献
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针对回流混合液中溶解氧导致缺氧池脱氮性能下降的问题,分析回流混合液中的溶解氧浓度及其对污水中易生物降解有机物的消耗量,提出设置脱气池的工程措施。在3座污水厂的现场试验表明,曝气停止后,混合液中溶解氧快速降低,30 min内混合液中溶解氧分别下降了1.24、2.78和1.86 mg/L。脱气池可以有效控制回流混合液中的溶解氧,平均去除溶解氧1.81 mg/L,耗氧速率为2.22 mgDO/(gVSS·h)。脱气池布置在好氧池的末端,内设搅拌器防止污泥沉降和利于脱气,设计水力停留时间(HRT)宜为0.5 h,可灵活应用于AAO和多级AO等工艺,提高污水处理厂的脱氮性能,可用于污水处理厂提标改造或新建工程中。 相似文献
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锦纶6生产废水为可生化性良好的含氮有机废水,采用水解酸化-两段生物接触氧化工艺处理该废水,考察了硝化液回流比、水力停留时间及溶解氧浓度对处理效果的影响。结果表明,在硝化液回流比为3、水力停留时间为12.1h以及水解酸化池和1 ^#、2^#接触氧化池的溶解氧浓度分别为(0.5~1.0)、(3.0~3.5)和(1.8~2.3)mg/L的条件下,系统的处理效果最好,对COD和TN的去除率分别为95.85%和61.04%,出水水质达到了《污水综合排放标准》的一级标准。 相似文献
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Carrousel氧化沟脱氮除磷工艺的运行控制 总被引:23,自引:5,他引:18
根据江门市文昌沙水质净化厂的运行经验,探讨了脱氮除磷的Carrousel氧化沟工艺在进水混合液配比、回流比、MLSS、泥龄、DO等工艺参数方面的调整控制,并总结了较佳的脱氮除磷运行方式。 相似文献
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影响生物除磷效果的几点因素探讨 总被引:1,自引:0,他引:1
通过比较采用A2/O处理工艺的三座污水处理厂的生物池设计、实际进水浓度、工艺参数选择等因素与二沉池出水总磷浓度的关系,经过试验调试和分析探索,确定在泥龄一定的条件下,厌氧池池容(水力停留时间)、实际进水COD(BOD5)浓度、进水碳源的分配、污泥浓度(MLSS)、溶解氧等是提高A2/O工艺生物除磷效果的关键控制参数,而在所有的影响因素中,水力停留时间又最为关键。因此,在侧重生物除磷的系统设计中,根据《室外排水设计规范》中"厌氧池水力停留时间宜为1~2 h"条文,建议取上限值,甚至可延长至2.5 h。 相似文献
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介绍了一种新型的脱氯除磷工艺及其运行情况。该工艺是对传统A^2/O工艺的改进(可称为改良型A^2/O工艺),它采用了后置反硝化系统以及厌氧池碳源分流技术和回流污泥预缺氧反硝化技术,以提高系统的脱氯除磷效果。研究结果表明:在进水COD≥300mg/L,TN为40.3mg/L,TP为3.82mg/L时,对TN、TP及COD的去除率分别可迭70%、86%和88%;当COD〈300mg/L时,对TP的去除效果较差,但对TN和COD的去除率仍分别可达60%和85%;试验期间,污泥沉降性能良好。 相似文献
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数学模拟技术用于污水处理工艺的运行诊断与优化 总被引:1,自引:5,他引:1
采用TUD模型与AQUASIM模拟软件对某大型市政污水处理厂倒置A^2/O工艺的运行问题进行诊断,同时提出优化运行方案并进行了模拟预测。结果表明,进水中的碳源特别是挥发性脂肪酸(VFA)不足和厌氧水力停留时间(HRT)太短是导致脱氮除磷效果不佳的主要原因。针对这两大问题,提出了曝气池分区重组、外加碳源、总进水超越初沉池、UCT改造以及结合磷回收等优化运行和工艺改造方案,并通过模拟预测了各种改造方案可能出现的较好运行效果。 相似文献
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改良A2/O生物脱氮除磷工艺生产性应用研究 总被引:2,自引:2,他引:0
利用青岛李村河污水处理厂生产装置,对改良A^2/O工艺进行了系统的生产性应用研究.研究结果表明,对于处理以工业废水为主的城市污水,该工艺不仅具有高效的有机物、氮、磷脱除能力,而且具有运行稳定、抗冲击负荷和适应水质环境变化能力强的特点. 相似文献
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A-A~2/O工艺处理低浓度城市污水的效果分析 总被引:3,自引:2,他引:1
结合安庆城东污水厂的实际运行情况,对A—A^2/O工艺处理低浓度城市污水的效果进行了分析和研究。结果表明,A—A^2/O工艺对COD、氨氮的去除效果好,对TP的去除效果与排泥有关,反硝化效果差会增加出水TP浓度。预缺氧选择池的设置使厌氧池中几乎不发生脱氮,而在传统A^2/O工艺中有50%的氮是通过厌氧池脱除的。分格曝气池的第1格已具备较好的推流流态,3池中的活性污泥浓度呈上升趋势,而污泥的SOUR递减。提高活性污泥浓度,并不能作为提高对COD、氨氮去除效果的措施,相反会导致除磷效果变差。 相似文献
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Conventional abattoir wastewater treatment processes for carbon and nutrient removal are typically designed and operated with a long sludge retention time (SRT) of 10–20 days, with a relatively high energy demand and physical footprint. The process also generates a considerable amount of waste activated sludge that is not easily degradable due to the long SRT. In this study, an innovative high-rate sequencing batch reactor (SBR) based wastewater treatment process with short SRT and hydraulic retention time (HRT) is developed and characterised. The high-rate SBR process was shown to be most effective with SRT of 2–3 days and HRT of 0.5–1 day, achieving >80% reduction in chemical oxygen demand (COD) and phosphorus and approximately 55% nitrogen removal. A majority of carbon removal (70–80%) was achieved by biomass assimilation and/or accumulation, rather than oxidation. Anaerobic degradability of the sludge generated in the high-rate SBR process was strongly linked to SRT, with measured degradability extent being 85% (2 days SRT), 73% (3 days), and 63% (4 days), but it was not influenced by digestion temperature. However, the rate of degradation for 3 and 4 days SRT sludge was increased by 45% at thermophilic conditions compared to mesophilic conditions. Overall, the treatment process provides a very compact and energy efficient treatment option for highly degradable wastewaters such as meat and food processing, with a substantial space reduction by using smaller reactors and a considerable net energy output through the reduced aerobic oxidation and concurrent increased methane production potential through the efficient sludge digestion. 相似文献
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Influence of operational parameters on nitrogen removal efficiency and microbial communities in a full-scale activated sludge process 总被引:1,自引:0,他引:1
To improve the efficiency of total nitrogen (TN) removal, solid retention time (SRT) and internal recycling ratio controls were selected as operating parameters in a full-scale activated sludge process treating high strength industrial wastewater. Increased biomass concentration via SRT control enhanced TN removal. Also, decreasing the internal recycling ratio restored the nitrification process, which had been inhibited by phenol shock loading. Therefore, physiological alteration of the bacterial populations by application of specific operational strategies may stabilize the activated sludge process. Additionally, two dominant ammonia oxidizing bacteria (AOB) populations, Nitrosomonas europaea and Nitrosomonas nitrosa, were observed in all samples with no change in the community composition of AOB. In a nitrification tank, it was observed that the Nitrobacter populations consistently exceeded those of the Nitrospira within the nitrite oxidizing bacteria (NOB) community. Through using quantitative real-time PCR (qPCR), nirS, the nitrite reducing functional gene, was observed to predominate in the activated sludge of an anoxic tank, whereas there was the least amount of the narG gene, the nitrate reducing functional gene. 相似文献
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废弃菜叶处理(破碎+厌氧产沼气)过程中产生的废水是一种污染物浓度较高、C/N偏低的废水。云南某废弃菜叶处理厂废水处理工程采用A2O2(二级O池为MBR膜池)工艺,以强化氮的脱除,保证出水TN的达标。对A2O2工艺的启动特性、运行效果及运行费用组成进行了分析。在工艺启动过程中,COD的去除效率可以稳定在70%以上;当硝化反应发生后,对NH4+-N的去除率>99.5%;投加一定量的碳源后,对TN可以达到较高的去除率。稳定运行后,出水的COD、NH4+-N、TN和TP分别稳定在300、10、45、5 mg/L以下,满足《污水排入城镇下水道水质标准》(GB/T 31962—2015)的C级标准。经测算,处理成本为27.564元/m3。 相似文献