好氧消化和双氧水氧化技术改善污泥脱水性能试验研究

发布时间：2018-03-23 02:37

  本文选题：脱水性能　切入点：好氧消化　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着污水生物处理技术的普及,需要进行处理和处置的污泥量也会急剧增加,污泥若直接进行机械脱水,泥饼含水率仍高达80%左右,而中国固体废物的填埋标准为含水率小于60%。因此,仅仅进行污泥的机械脱水是远远不够的,采取有效的调理方法改善污泥的脱水效果,污泥的含水率降低,具有非常重要的工程意义。本论文利用污泥好氧消化技术和双氧水氧化溶胞技术,研究了两种技术组合工艺对城市污水厂污泥脱水性能的影响,通过因素试验对比以及正交试验发现污泥好氧消化48h后,其污泥比阻和泥饼含水率经双氧水氧化后达到最低;组合工艺的调理优先级顺序为先进行污泥好氧消化,之后在酸性条件下进行双氧水氧化;对污泥脱水性能影响较大的因素为污泥好氧消化温度和污泥浓度,而污泥初始p H值、好氧消化溶解氧浓度和调理时间影响则不大;对污泥的最佳调理条件为:调理温度范围为30℃左右,污泥初始浓度为12000mg/L。污泥初始p H值为3,好氧消化溶解氧浓度为2.5mg/L,调理时间为60min,双氧水投加量为75μl/g。在最佳条件下,污泥脱水程度和速度相比空白样分别提高了10.66%和62.58%通过试验发现双氧水的氧化作用产生的微气泡对污泥产生的气浮浓缩能进一步产生泥水分离的效果,提取上层浓缩污泥进行脱水后其泥饼含水率脱水程度相比于双氧水氧化污泥后均匀搅拌的泥饼含水率提高了4.15%,相比空白污泥提高了10.90%,脱水效果进一步增强,且比较于一般气浮浓缩法还省去了压缩空气带来的机械和动力费用。为进一步研究组合工艺改善污泥脱水性能的机理,本论文在组合工艺对污泥脱水后上清液中分别从蛋白质、多糖和SCOD含量以及EPS四个方面分析了其变化规律对污泥脱水性能的影响。污泥经组合工艺调理后,在一定时间内LB-EPS含量和LB-EPS/TB-EPS质量比明显减小,这说明污泥中LB-EPS含量及LB-EPS/TB-EPS质量比与污泥脱水性能存在一定关系,LB-EPS含量及LB-EPS/TB-EPS质量比越高,污泥脱水难度越大。当污泥中LB-EPS含量减少后污泥脱水性能得到有效改善。
[Abstract]:With the popularization of wastewater biological treatment technology, the amount of sludge that needs to be treated and disposed of will increase sharply. If sludge is dewatered directly, the moisture content of mud cake is still up to 80%. However, the landfill standard of solid waste in China is that the moisture content is less than 60%. Therefore, it is far from enough to dewatering sludge by mechanical dewatering. It is not enough to adopt effective conditioning methods to improve the dewatering effect of sludge and reduce the moisture content of sludge. In this paper, the effects of two combined technologies on sludge dewatering performance of municipal wastewater treatment plant were studied by means of aerobic sludge digestion technology and hydrogen peroxide oxidation dissolved cell technology. Through the comparison of factors and orthogonal experiments, it was found that after aerobic digestion for 48 hours, the sludge specific resistance and sludge cake moisture content reached the lowest after oxidation with hydrogen peroxide, and the priority order of the combined process was that the sludge was digested by aerobic digestion first, and the sludge specific resistance and sludge cake moisture content reached the lowest after 48 hours of aerobic digestion. After that, hydrogen peroxide was oxidized under acidic conditions, and the factors affecting sludge dewatering performance were sludge aerobic digestion temperature and sludge concentration, but the initial pH value of sludge, aerobic digestion dissolved oxygen concentration and conditioning time had little effect on sludge dewatering performance. The optimum conditioning conditions for sludge are as follows: the temperature range is about 30 鈩，

本文编号：1651562