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采用竖式SBR作为反应器,利用城市污水处理厂剩余污泥作为接种污泥,通过不间断运行培养出好氧颗粒污泥。实验结果表明,采用非限量曝气模式好氧颗粒污泥降解模拟污水的效果较好,其COD去除率可达98%以上。曝气量对好氧颗粒污泥的形成和稳定具有重要影响,当气速为26.5m/h时,好氧颗粒污泥的性状和处理有机废水效果最佳。同时好氧颗粒污泥对pH值的变化不明显,当pH为5—8范围内,其COD去除率都可达到85%以上。但是未经驯化的好氧颗粒污泥对对硝基苯酚和对氯苯酚两种芳香类有机物较敏感,而对硝基苯酚对其毒性更大。当对硝基苯酚和。对氯苯酚浓度为10mg/L时,其COD去除率仅为42.5%和52%。 相似文献
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溶解氧对好氧颗粒污泥影响的研究进展 总被引:1,自引:0,他引:1
好氧颗粒污泥技术是一种新颖废水处理技术。溶解氧(DO)是好氧颗粒污泥形成和稳定运行的一个重要参数。好氧颗粒污泥需要的曝气量大,能耗高。高曝气量带来的高DO浓度不利于氨氮通过SND去除。当DO扩散在颗粒内部受到限制时,颗粒中心形成的厌氧层不利于颗粒污泥的长期稳定运行。本文系统分析了DO浓度对好氧颗粒污泥影响的国内外研究现状,对好氧颗粒污泥中DO浓度这一重要参数的研究进行了总结。研究在低DO浓度下保持好氧颗粒污泥的稳定性有利于降低运行成本,采取合适的方法降低颗粒内部的扩散限制有利于增强颗粒的稳定性能。 相似文献
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好氧颗粒污泥同时脱氮除磷技术研究 总被引:1,自引:0,他引:1
采用序批式活性污泥法(SBR)处理新疆油田公司准东石油基地污水,作为生物膜的一种特殊形式,介绍了该工艺的优点,在适宜的运行条件下进行实验。讨论了好氧颗粒污泥脱氮以及除磷的过程,分析了该工艺对氮、磷的去除率及好氧颗粒污泥在好氧、缺氧条件下的吸磷情况,当进水氨氮、磷和乙酸碳浓度分别为38.2 mg/L、27.7 mg/L和134.6 mg/L,MLSS和MLVSS分别为7.0 mg/L、6.4 mg/L时,氨氮、总无机氮、磷、乙酸碳的平均去除率分别达到98.8%、90.2%、98.9%、97.2%. 相似文献
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通风条件对城市污水厂污泥好氧堆肥过程的影响 总被引:2,自引:0,他引:2
本文选择堆肥熟料作为添加剂与城市污水厂污泥混合进行好氧堆肥。通过对温度、耗氧速率、有机物、含水率、pH值和氨氮等指标的分析,重点研究了不同通风条件对堆肥过程的影响。实验结果表明,污泥与熟料混合后,有机物含量较低,堆肥速率较快,对通风条件的改变比较敏感。当通风量低于0.025m3/(m3.min)时,堆肥前期系统供氧不足,堆肥速率较慢,耗时长,同时堆体内变为厌氧环境,pH值变低,臭气产生量高;当通风量高于0.05m3/(m3.min)以及采用变风量通风时,在保证供氧量充足的同时,具有较长的高温期,具有臭气产生量小、堆肥速率快的优点,但采用变风量通风更加节能。 相似文献
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为了提高出水质量,法国小镇Cagnes—sur—Mer的生活污水处理厂从2008年初开始实施高有机负荷的运行,但同时这也提高了出泥产量。由于污泥的处理费用及搬运污泥的交通费用很高,水厂对污泥进行了污泥好氧稳定工艺,工艺使用纯氧机(VSA装置)就地利用空气制氧。工艺投入运行后,每日对好氧消化池的入泥和出泥进行采样和检测(MLSS、MLVSS、pH、COD、DRYNESS etc)以建立完整的运行数据。污泥经好氧消化作用后其有机物含量减少60%以上,每月减少40吨的出泥。同时,消化池的使用还使水厂周日也能对曝气池中的污泥进行抽取,缓解了以往由于周日停止排泥而导致周一曝气池中污泥浓度过大的问题。从而达到优化出水水质的目的。消化池中的温度维持在40℃左右,因为反应为放热反应,所以无需加热设备。此项目所收集到的数据将为这种工艺的发展提供帮助。同时也可以为那些想要减少出泥量的水厂提供一种新的方法。因为它投资小,见效快,操作简单。 相似文献
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Sewage sludge represents a critical environmental issue in Egypt. Large quantities of CKD are emitted from cement factories. It has negative impacts on humans, animals, plants, lands, water, and all remaining environment. It causes serious problems on the national level. Besides using CKD for sludge treatment and reuse as soil conditioner, a new scenario is to use it as catalytic convertor of some hydrocarbons. Results showed that CKD is used to separate the organic matters and suspended solids, reduce the organic micropollutants, scavenge heavy metals, and destruct viruses, parasites, and all pathogenic bacteria. The dehydrogenation of isopropanol to acetone and alcohol condensation of the produced acetone to give methyl isobutyl ketone over different catalyst samples was studied using a flow technique under normal pressure. Results revealed that treatment of raw sludge led to an increase in catalytic activity toward acetone formation by 50?% at 400?°C. A treatment system was proposed for continuous operation. 相似文献
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Sorption and biodegradability of sludge bacterial extracellular polymers in soil and their influence on soil copper behavior 总被引:1,自引:0,他引:1
Bacterial extracellular polymers (BEP) affect the translocation and fate of organic and inorganic pollutants in terrestrial and aquatic ecosystems. In this study, BEP from activated sludge was compared with sludge dissolved organic matter (DOM) in terms of behavior and effects on the mobilization and bioavailability of Cu in a well-aged Cu-contaminated orchard sandy loam. Addition of sludge BEP (10-200 mg dissolved organic carbon [DOC] L(-1)) to the soil resulted in 1.6- to 12.8-fold-higher soil soluble Cu concentration over the control and 1.3- to 2.2-fold over sludge DOM of the same concentration. Consequently, the Cu uptake by the ryegrass (Lolium perenne L., cv. Target) grown in the soil was increased by 31% due to interval watering of 100 mg DOC L(-1) of sludge BEP solution in a 35-d period. The influence of sludge BEP on mobilizing soil Cu could be maintained as long as 60 d or more, depending on BEP biodegradation status. The findings that sludge BEP promoted Cu mobilization and bioavailability could be attributed to less adsorption of BEP by soil, slow degradation, and higher affinity with Cu. For example, after 3 wk of aerobic incubation, the soluble Cu present in the sludge DOM-treated soil was reduced to about the level of the control, while the concentration of soluble Cu in BEP-treated soil was 6.2 times higher than that in the control. Therefore, sludge BEP could act as a facilitated-transport carrier of Cu. The environmental risk of Cu should receive much attention if BEP is incorporated into soils. 相似文献
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高盐度气田废水处理试验研究 总被引:1,自引:1,他引:0
以某污水厂好氧污泥为接种污泥,半软性纤维填料为载体,采用逐步提高盐度和有机负荷的方法对生物膜进行耐盐性和高有机负荷驯化。结果表明:经过一段时间驯化所得异养生物膜能够适应高盐度和高有机负荷的环境;生物膜对环境盐度变化的适应性有一定的波动;生物膜对有机物的降解能力随系统有机负荷增大而降低,连续进水、出水不回流且流量为0.292L/h,HRT为24h条件下,COD去除率最后保持在65%左右;COD去除率达到65%的时间与系统有机负荷呈线性正相关,相关系数为0.9112;驯化后耐盐微生物对温度和酸碱度不敏感,最佳生长温度为23℃,pH值为7~8。 相似文献
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污泥接种量对好氧污泥颗粒化的影响研究 总被引:3,自引:0,他引:3
考察了污泥接种体积分别为25%、50%和75%的反应器有效容积情况下的污泥颗粒化特征。结果发现,25%体积的污泥接种量利于颗粒污泥的形成和成长,其颗粒化程度高、平均粒径大且粒径分布范围广,而50%和75%体积的污泥接种量只能形成少量细小的颗粒污泥。分析认为,悬浮分散污泥是颗粒化的一个较大障碍,较少的接种量能够提供较大的自由沉淀空间,使污泥能够实现重力分层,进而排除与颗粒污泥竞争底物的悬浮不沉降污泥,从而利于颗粒化。污泥颗粒化的直接影响因素不是沉淀时间而是自由沉淀空间。沉淀时间的缩短使自由沉淀空间增加,从而影响了污泥颗粒化进程。 相似文献