气升回流一体化装置除磷研究

发布时间：2018-06-15 18:30

本文选题：气升回流一体化 + 除磷　；参考：《苏州科技学院》2015年硕士论文

【摘要】：城市化进程的推进,大大改善了人们的居住环境,但同时也使原本可通过自然净化作用去除的污染源转变为许许多多的分散式污染源,由于过分分散而无法纳入城市的集中处理系统。这催生了分散式污水处理,它是集中式污水处理系统的有效的、必要的补充。气升回流一体化装置是一种针对分散式生活污水处理而设计的反应器,主要由进水区、缺氧区、好氧区、气升回流区及沉淀出水区组成,其结构紧凑,占地面积少,运行费用低,管理维护简单,对各种经济发展水平下的地区都具有普遍适用性。该装置具有良好的有机物和氨氮去除效能,而对于其他污染物的去除能力尚未进一步研究。在对系统进出水总磷进行检测的过程中发现,出水总磷含量比进水含量低,即存在一定的磷去除能力。目前,除磷方法主要有传统的微生物除磷、动植物吸收、吸附除磷以及化学沉淀除磷等,还有尚处于试验研究阶段的磷酸盐还原机制。基于气升回流一体化中试装置的除磷现象,结合对基本理论的回顾,以气升回流一体化中试装置为研究对象,以生活污水为原水,探讨气升回流一体化中试装置的除磷效能及其除磷途径,以期进一步完善反应器除污性能,便于反应器的推广应用。气升回流一体化中试装置总有效容积10.31m3,在2014年10月~2015年10月运行期间,在不排放污泥的条件下,DO含量为0.5-2.0mg/L,回流比为0.6-1.0,进水平均流量为(552±94)L/h,进水平均总磷含量为(4.628±0.966)mg/L,表现出对总磷的长效去除,在这种条件下得到以下主要结论:1)系统平均除磷效率为(44.629±8.646)%,平均除磷量为(27.120±8.258)g/d。2)系统的主要除磷途径主要包括污泥囤积、动物摄食和磷酸盐还原机制。污泥囤积去除磷量为8.218g/d,占总去除量的30.30%。其中缺氧区总磷囤积为5.834g/d,好氧区和沉淀区共囤积总磷2.384g/d。系统污泥中各形态磷对污泥囤积除磷的贡献率最大从小到大依次为Res-P、Ca-P、BD-P、H_2O-P Org-P和NaOH-P,贡献率分别为6%、6%、9%、15%、23%和41%。动物摄食作用去除磷量为0.795g/d,占系统总磷去除量的2.93%,此外由于蚊虫生长繁殖而去除掉的磷无法估算。系统磷损失18.107g/d,缺氧区污泥MBP平均含量为0.70±0.58mg/kg,好氧区污泥中MBP含量高达4.81mg/kg,推断磷损失是磷酸盐还原机制的结果,即磷酸盐在还原作用下转化为磷化氢,以气态形式从系统中释放到大气中。磷损失的部分还可能包含了蚊虫成虫离开系统带出的磷。3)除磷效率随进水流量的增加有所下降,与缺氧区水流流量无关;进水流量在(320~730)L/h时,除磷量随进水流量和缺氧区水流流量的增加而增加。且当回流硝态氮量(QrNO_3~--N)等于215g/d左右时,系统除磷量达到最大。当QrNO_3~--N215g/d时,除磷量随QrNO_3~--N增加而升高,当QrNO_3~--N215g/d时,除磷量随QrNO_3~--N的增加而降低。除磷量还受缺氧区除碳量(RAC)的影响,并随RAC的增加而逐渐增加。出水浊度的增加会导致出水总磷含量升高,系统除磷效率降低。
[Abstract]:The advancement of urbanization has greatly improved the people's living environment, but at the same time, it also makes the source of pollution removed by natural purification into a number of scattered sources of pollution. Due to excessive dispersion, it can not be incorporated into the centralized treatment system of the city. This has caused the dispersed sewage treatment, which is a centralized sewage treatment system. The air lift backflow integrated device is a reactor designed for the treatment of dispersed domestic sewage. It consists mainly of water intake area, anoxic area, aerobic zone, air lift reflux area and precipitated water area. It has compact structure, less occupied area, low operating cost, simple management and maintenance, and to a variety of economic development levels. The area has universal applicability. The device has good organic and ammonia nitrogen removal efficiency, and the removal capacity of other pollutants has not been further studied. In the process of detecting the total phosphorus in the system, the total phosphorus content of the effluent is lower than that of the influent. There are traditional microbial phosphorus removal, plant and plant absorption, phosphorus removal, chemical precipitation and phosphorus removal, as well as phosphate reduction mechanism, which is still in the experimental stage. Based on the phenomenon of phosphorus removal in the pilot plant of air lift reflux integration, combined with the basic theory, the pilot plant of air lift and reflux integration is used as the research object and domestic sewage is taken as the research object. In order to further improve the depollution performance of the reactor and facilitate the application of the reactor, the total effective volume of the pilot plant was 10.31m3. The content of DO was 0.5 under the condition of no sludge discharge in October 2014 ~2015. The total effective volume of the reactor was improved to further improve the performance of the reactor and the application of the reactor. -2.0mg/L, the reflux ratio is 0.6-1.0, the average flow rate of influent is (552 + 94) L/h, the average total phosphorus content of the influent is (4.628 + 0.966) mg/L, showing the long-term removal of total phosphorus. Under this condition, the following main conclusions are obtained: 1) the average phosphorus removal efficiency of the system is (44.629 + 8.646)%, and the average phosphorus removal amount is (27.120 + 8.258) g/d.2) and the main dephosphorization route of the system Mainly including sludge hoarding, animal feeding and phosphate reduction mechanism. The sludge hoarding to remove phosphorus is 8.218g/d, accounting for the total removal of 30.30%., and the total phosphorus in the anoxic area is 5.834g/d, and the contribution rate of each form of phosphorus to the sludge hoarding in the aerobic and precipitation areas of the total phosphorus 2.384g/d. system sludge is Res-P The contribution rates of Ca-P, BD-P, H_2O-P Org-P and NaOH-P were 6%, 6%, 9%, 15%, 23% and 41%. for the removal of phosphorus by 0.795g/d, accounting for 2.93% of the total phosphorus removal of the system. In addition, the phosphorus removal from the growth and reproduction of the mosquitoes could not be estimated. The system phosphorus loss 18.107g/d, the average MBP content of the sludge in the anoxic region was 0.70 + 0.58mg/kg, aerobic zone sludge The content of MBP is up to 4.81mg/kg, and it is concluded that the phosphorus loss is the result of phosphate reduction mechanism, that is, phosphate is converted into hydrogen phosphide under reduction, and is released from the system to the atmosphere in the form of gaseous state. The part of phosphorus loss may also include phosphorus.3 from the adult insect leaving the system with the increase of the influent flow rate. The flow rate of the water flow in the anoxic region is independent. When the influent flow is (320~730) L/h, the amount of phosphorus removal increases with the increase of the influent flow and the flow flow in the anoxic region. And when the amount of reflux nitrate nitrogen (QrNO_3~--N) is about 215g/d, the amount of phosphorus removal reaches the maximum. When QrNO_3~--N215g/d, the amount of phosphorus increases with the increase of QrNO_3~--N, when QrNO_3~--N215g/d, except for QrNO_3~--N215g/d. The amount of phosphorus decreased with the increase of QrNO_3~--N. The phosphorus removal was also affected by the amount of carbon removal (RAC) in the anoxic region and increased with the increase of RAC. The increase of the turbidity of the effluent would lead to the increase of total phosphorus content in the effluent, and the efficiency of the system dephosphorization was reduced.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

【参考文献】