不同添加剂对培养厌氧颗粒污泥促进作用的试验研究

发布时间：2018-05-30 22:17

  本文选题：厌氧颗粒污泥 + 胞外聚合物　； 参考：《中国矿业大学》2017年硕士论文

【摘要】：厌氧技术在高浓度和难降解有机废水的处理过程中有着重要的作用,厌氧污泥的颗粒化是厌氧反应器高效和稳定运行的关键,但厌氧污泥颗粒化速度慢,而成熟的厌氧颗粒污泥资源少,价格高。随着其大规模的应用,研究经济且有效地厌氧颗粒污泥规模化培养技术,具有很强的实际意义和理论价值。本文以粒状脱水污泥为最终接种污泥,主要研究了初始接种污泥种类和污泥脱水前不同物质的添加对厌氧颗粒污泥培养过程中颗粒稳定性和活性的影响,并以中药制药废水验证了所培养颗粒的降解能力,需注意的是本研究中厌氧颗粒污泥不是由絮状污泥或粒状脱水污泥破碎后产生的絮状污泥培养所得,而是由稳定的粒状脱水污泥直接转化所得。首先研究了接种污泥种类对培养厌氧颗粒污泥的影响。所用三种接种污泥中,胞外聚合物(EPS)中的蛋白质(PN)/多糖(PS)比大小依次为厌氧污泥好氧污泥初步厌氧污泥,相应地PN/PS值越高的接种污泥所制备的颗粒稳定性越高,而颗粒活性根据接种污泥表现为厌氧污泥初步厌氧污泥好氧污泥,且接种有厌氧污泥的颗粒,其COD去除率、产气量和产气中的CH4含量均显著高于其它各组,但经27d培养后颗粒活性趋于一致,验证了好氧性质的污泥作为接种污泥培养厌氧颗粒污泥的可行性。其次,研究了污泥脱水前不同物质的添加对培养厌氧颗粒污泥的影响。对于颗粒稳定性提高方面:不在35℃下放置30min进一步降低粒状脱水污泥含水率时,无机混凝剂和高离子度(50%)的阳离子聚丙烯酰胺(CPAM)可显著提高颗粒稳定性,而无机混凝中聚合氯化铝(PAC)优于聚合硫酸铁(PFS)和聚合氯化铝铁(PAFC);在35℃下放置30min进一步降低粒状脱水污泥含水率时,PAC无明显效果,而CPAM可显著提高颗粒稳定性,分子量越大颗粒越稳定,与离子度无明显关系。对于颗粒活性提高方面:零件铁(Fe0)可提高颗粒污泥的COD去除率和CH4含量,并促进EPS的分泌,单独使用时对颗粒的稳定性影响不大,但与PAC协同使用时对颗粒污泥稳定性的促进作用优于两者单独使用时;添加碳源能提高颗粒活性,但影响颗粒稳定性,在100mg COD/g MLSS和200mg COD/g MLSS的添加量下,乙酸钠对颗粒的稳定性都起反效果,而淀粉表现为添加量少时可提高颗粒稳定性,添加量多时损失量大于又添加乙酸钠的。以粒状脱水污泥培养厌氧颗粒污泥的过程中,颗粒内部的EPS会经历先降低后上升的过程,最后变得多孔。培养过程中水力剪切力不能过低,150r/min条件下获得的颗粒活性和稳定性都不如165r/min培养的,且当厌氧瓶内颗粒量过多时,因颗粒间的碰撞摩擦几率变大颗粒损失量相应变多。此外,培养的颗粒污泥具有良好的储存性,放置90d后仍有较好的活性和稳定性。
[Abstract]:Anaerobic technology plays an important role in the treatment of high concentration and refractory organic wastewater. The granulation of anaerobic sludge is the key to the efficient and stable operation of anaerobic reactor, but the rate of anaerobic sludge granulation is slow. The mature anaerobic granular sludge resource is less and the price is high. With its large scale application, it is of great practical significance and theoretical value to study the scale culture technology of anaerobic granular sludge. In this paper, granular dewatered sludge was used as the final inoculation sludge. The effects of the types of initial inoculated sludge and the addition of different substances before sludge dewatering on the stability and activity of anaerobic granular sludge were studied. The degradation ability of the cultivated granules was verified by the traditional Chinese medicine pharmaceutical wastewater. It is important to note that the anaerobic granular sludge in this study is not obtained from the flocculation sludge or the flocculating sludge produced by the broken granular dewatered sludge. Instead, it is obtained from the direct conversion of stable granular dewatered sludge. Firstly, the effect of inoculation sludge on anaerobic granular sludge was studied. In the three kinds of inoculated sludge, the ratio of protein (PNN) and polysaccharide (PS) in extracellular polymer (EPS) was the primary anaerobic sludge of anaerobic sludge, and the higher the PN/PS value, the higher the stability of the granules. The COD removal rate, gas production and CH4 content in anaerobic sludge inoculated with anaerobic sludge were significantly higher than those in other groups, and the activity of granules was significantly higher than that of other groups according to the initial anaerobic sludge aerobic sludge inoculated with anaerobic sludge, and the COD removal rate, gas production and CH4 content in anaerobic sludge inoculated with anaerobic sludge were significantly higher than those in other groups. However, after 27 days of culture, the granular activity tended to be the same, which verified the feasibility of aerobic sludge as inoculation sludge to cultivate anaerobic granular sludge. Secondly, the effects of different substances on anaerobic granular sludge culture before dewatering were studied. As for the improvement of particle stability: when 30min is not placed at 35 鈩，

本文编号：1957048