海绵铁加量对SBR反应器性能的影响研究

发布时间：2018-03-13 08:37

  本文选题：海绵铁　切入点：SBR反应器　出处：《兰州交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国工业化及城镇化进度的推进,大量污水的未达标排放直接导致了我国水体的严重污染。尤其是湖泊水库,绝大部分都处于富营养化的状态,其中的主要的污染物指标依然是COD、TN和TP。在众多的水处理工艺中,SBR反应器兼具均化池、初沉池、生化池、二沉池的功能于一身,运行控制灵活、抗冲击复合强,是目前最应用广泛的生化处理工艺之一。然而,传统SBR反应器常存在污泥浓度低、只适用于中小水量、生物脱氮除磷效果不稳定等缺陷。海绵铁是一种比表面积大,含铁量高的金属多孔性载体,本课题将海绵铁载体与传统的SBR工艺相结合中,形成生物海绵铁体系,充分发挥了SBR反应器和海绵铁载体的优点。本课题以未加入海绵铁的SBR反应器为对照,另外同时设置了海绵铁加量分别为40g/L、90g/L和150g/L的三组SBR反应器,从以下几个方面研究了海绵铁的投加对SBR反应器的影响:①海绵铁投加量为40g/L、90g/L和150g/L时对SBR反应器中COD、NH3-N、TN和TP去除效果的影响;②海绵铁投加量为40g/L、90g/L和150g/L时对活性污泥中铁含量、污泥絮体结构、污泥性质(MLSS、MLVSS、MLVSS/MLSS和SVI)的影响,对污泥TTC-DHA活性、污泥INT-ETS活性和铁细菌数量的影响;③海绵铁投加量为40g/L时对SBR反应器硝化过程及反硝化过程的影响;④分别研究了以生活污水、乙酸钠、乙酸钠和葡萄糖混合碳源的和三种不同体系中K+和Mg2+表征生物除磷的可行性作用,并应用于海绵铁对SBR反应器生物除磷性能影响的研究。以上研究的结果表明:(1)与普通SBR反应器相比,海绵铁加量为40g/L时反应器COD去除效果最好,加量增加长期运行不利于COD的去除;加入海绵铁后不利于SBR反应器对NH3-N的去除,加量越多,去除效果越差;不同加量均对TN和TP的去除有促进作用,加量为40g/L促进作用最明显。(2)海绵铁加入后反应器中的Fe(Ⅱ)、Fe(Ⅲ)和TFe浓度迅速增加并明显高于未加入海绵铁的SBR反应器,Fe(Ⅲ)和TFe浓度与海绵铁加量呈正比;海绵铁加入后污泥絮体变密实,颜色变深,粒径变小,并且加量越大,絮体颜色越深、粒径越小、絮体之间连接物越少;加入海绵铁后反应器的MLSS及MLVSS值均高于普通SBR反应器,但MLVSS/MLSS和SVI值却小于普通SBR反应器,海绵铁加量越多,SVI值越小;加入海绵铁增强了污泥的TTC-DHA和INT-ETS活性;海绵铁的加入可以刺激活性污泥中铁细菌的生长,加量为90g/L时铁细菌数量最多。(3)SBR反应器中的硝化过程存在三个速率不同的阶段,SBR反应器和海绵铁-SBR反应器的最大硝化速率分别为0.947mg/(gMLVSS·h)和0.652mg/(gMLVSS·h),SBR反应器硝化速率更高,完成硝化反应的时间更短;海绵铁-SBR反应器的NNO??3生成速率明显小于硝化速率,存在同时硝化反硝化现象,普通SBR反应器不存在;海绵铁-SBR反应器反硝化过程分为3的不同速率的阶段,最大反硝化速率为0.366mg/(gMLVSS·h)。(4)3种不同碳源体系中K+和Mg2+浓度的变化与PO43-浓度的变化基本一致,参与生物除磷的过程;△K/△P数值和△Mg/△P数值稳定,可以作为表征生物除磷能力的参数。加入海绵铁后SBR反应器除磷过程中没有出现对K+浓度的吸收,不存在聚磷菌的生物除磷作用,高浓度的铁离子完全争夺了聚磷菌的磷源,除磷主要依靠铁离子的铁盐化学除磷。
[Abstract]:As China's industrialization and urbanization progress forward, a large number of sewage discharge is not directly led to the serious pollution of water body in our country. Especially in lakes and reservoirs, the vast majority are in the state of eutrophication, the main pollutant index which is still COD, TN and TP. in the water treatment process of many. All pool both SBR reactor, primary clarifier, biochemical pond, two sink the pond in a functional, flexible control and strong shock resistance compound, is currently the most widely used one of the biochemical process. However, the traditional SBR reactor has low sludge concentration, only suitable for small and medium-sized water removal effect of nitrogen and phosphorus instability and other defects. The sponge iron is a large surface area, metal containing porous carrier of high iron content, the SBR process of sponge iron carrier and the combination of the traditional and the formation of biological sponge iron system, give full play to the SBR reactor and the sea The advantages of sponge iron carrier. This paper did not join the SBR reactor of sponge iron were also set up at the same time the sponge iron was 40g/L respectively, three groups of SBR reactor 90g/L and 150g/L, from the following aspects of sponge iron dosage effect on SBR reactor: sponge iron cast with the dose of 40g/L, 90g/L and 150g/L of SBR reactor in COD, NH3-N, TN and TP removal effect; the dosage of sponge iron was 40g/L, 90g/L and 150g/L on the iron content in the activated sludge, sludge floc structure, sludge properties (MLSS, MLVSS, MLVSS/MLSS and SVI) effects on TTC-DHA activity, INT-ETS activity and the effect of sludge of iron bacteria; the sponge iron dosage effect on SBR process of nitrification and denitrification process 40g/L; 4 were studied by domestic sewage, sodium acetate, sodium acetate and glucose mixed carbon sources and three different systems in K+ 鍜孧g2+琛ㄥ緛鐢熺墿闄ょ７鐨勫彲琛屾，

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