《基于ASM2D的A2O工艺数学模拟和优化策略研究Based on ASM2D A2O process mathematical modeling and optimization strategy research》由会员分享，可在线阅读，更多相关《基于ASM2D的A2O工艺数学模拟和优化策略研究Based on ASM2D A2O process mathematical modeling and optimization strategy research（91页珍藏版）》请在金锄头文库上搜索。
1、摘要为进一步控制水环境污染和加快实现污水资源化，国内对城乡污水解决厂 的排放原则日益严格。这不仅使新建的污水解决厂要遵循高排放原则，同步， 既有的污水解决厂也面临着十分急切的升级改造压力。A2O工艺是目前国内城 镇污水解决厂普遍采用的一种同步生物脱氮除磷技术，因此，运用ASM2D数学 模型对A2O工艺进行模拟，分析优化A2o工艺控制措施和最佳工艺技术参数， 以进一步挖掘既有各解决单元的潜能，具有重要的理论与现实意义。本文以武汉市龙王嘴污水解决厂生物解决系统进水水质特性为研究对象。 持续1年的常规水质指标分析成果表白，龙王嘴污水解决厂进水中各污染物指 标(除NH3-N外)变化幅度较大，随季节变化
2、明显，分为两个阶段。第一阶段， 12月至6月进水中各污染物指标均较高，CODcr、BODs、SS、 TN、TP及P043平均值分别为：3878mgL、2659 mgL、3769 mgL、4066 mgL、 820 mgL和207 mgL：第二阶段，7月至11月进水中各污染 物指标均较低，上述各指标平均值分别为：1 968mgL、1223 mgL、1 384 mgL、 2575 mgL、387 mgL和156 mgL；NH3-N受环境因素影响不大，全年平均值 为1875mgL。基于ASM2D模型对龙王嘴污水解决厂进水水质组分进一步划分， 成果表白，当进水COD不不小于350mgL时，溶解性惰性不
3、可降解有机物SI、易生 物降解有机物SF、挥发酸SA、颗粒性慢速可生物降解有机物Xs以及颗粒态惰性 不可生物降解有机物XI占进水总COD的比例分别为72、109、73、509 和237；当进水COD不小于350mgL时，该比例分别为26、65、43、 297和569。建立了一套与龙王嘴污水解决厂工艺参数相似的24m3d中试装置，运用物 料平衡，分析研究了内回流比(300、200、100和O)对污染物在A2O 工艺中迁移转化及脱氮除磷性能的影响。实验表白，回流比对出水COD、BOD5、 SS以及NH3N的影响不大，但增大内回流比有助于硝化速率的提高，四种工况 条件下的平均硝化速率分别为1049N
4、H3-N(kglVILVSSd)、1029NH3-N (kgMLVSSd)、899NH3-N(kgMLVSSd)和869NH3-N(kgMLVSSd)。在本 实验中，在有内回流比条件下，内回流比对TN的清除效果影响不大，但随着内 回流比的减小，TN在选择区、厌氧区的清除比例逐渐减小；在无内回流的条 件下，好氧区第一廊道存在着明显的SND损失现象，占TN清除比例的334。在本实验中，随着内回流比的减小，TP和P043的清除率逐渐减小，缺氧区存在 反硝化除磷的现象，并随着内回流比的减小而增大，而在好氧池除磷的比例 随着内回流的减小而减小。运用课题组自主研发的基于ASMs的活性污泥法工艺模拟软件，一
5、方面对中 试模型进行了初步模拟及校准，成果表白，异养菌的产率系数YH对系统脱氮除 磷模拟有明显影响，硝化自养菌的最大生长速率ItAru对出水NH3-N有较大的影 响。校正后的模型模拟值与实测值符合较好，其中模拟出水COD、TN和N03 的相对误差分别为：32、12和65，由于模拟出水TP、P043。和NH3-N本 身值比较小，但其绝对误差均在03mgL如下，在正常范畴内。建立的模型可以 较好地模拟工艺的运营，可以基本满足中试系统对脱氮除磷趋势的分析。另一方面，运用校正后的模型，对中试系统进行工艺优化时发现，在进水污染 物浓度较低的状况下，内回流比宜为50100，污泥回流比宜为50-75，好 氧
6、池DO宜控制在1520mgL范畴内，可得到较好的出水水质，并可节省能 耗。同步，中试系统生物解决单元解决能力具有很大提高空间。核心词：A2O工艺；脱氮除磷；水质特性；内回流比；ASM2D；优化方略AbstractIn order to take fturther msures to control the serious water pollution of the environment and speed up the process of converting wastewater into resources， increasingly stringent emission stand
7、ards for municipal wastewater treatment plantsare formulated in OUr countryNot only the W，1Ps which are going to be built havet0 0bey the high emission standards，but the existing WWTPs are also facing a very urgent pressure of upgrading and transformationAt present,A2O process has been generally acc
8、epted and widely applied as one of the simultaneous biological nutrient and phosphorus removal technologies for W啊仃Ps in OUr country,therefore, mathematical simulation of the A2O process based on ASM2D，analysis the optimization of control strategies and the best technical parameters of A2O processfi
9、lrther excavating the potential of each existing process units，all enjoy importanttheoreticalandpracticalsignificanceFirst of all，the influential water quality characteristics of the biological treatment system of Longwangzui WWTP in Wuhan were analysised in the paper The continuous one-year analysi
10、s of the conventional water quality had shovm that the concentration of pollutant index(except the NH3-N index)in the influent is of great variation along with the seasonal change and could be divided into two obviousstagesThe concentration of various pollutant index is high from December to June ，a
11、nd CODer,BODs，SS，TN，TP and P04of the influent are 3878 meL, 2659 In班，3769 meL，4066 meL，820 meL and 207 meL respectively in averageThe CODer,BOD5，SS，TN，TP and P04弘of the influent from July toNovember ，are 1968 meL，1223 mg，L，1384 meL,2575 meL，387 meL and 156 meL respectively in average，which shows tha
12、t the concentration of various pollutant index is lowEnv打onmenml factors have little effect on the NH3-N index, witll its annual average concentration standing at 1 875 meLFurther analysis of thewater quality of the influent in Longwangzui WWTP were conducted according toASM2D standards，and it shows
13、 that when the influent total COD Was less than 350 mgL，Sb SFSAXs and Xt take up 72，l 09，73，509and 237of totalCOD in average respectively And when it is greater than 350 111扎Sl，St,SAXs andIIIXI take up 26，65，43，297and 569of total COD in average respectively A 24 nljd pilot plant with the same proces
14、s parameters with Longwangzui WWTP was established。the migration and transformation of the pollution in the醚| O process，and the performance of nitrogen and phosphorus removal Were studied and analysised using material balance method under different internal recycle ratio， namely 300，200，1 OOand OThe
15、 result showed that，the internal recycle ratio had little effect on the effiuent COD，BOD5，SS and NH3-N，howcver,raising internal recycle ratio had contributed to the increase of the nitrification rate，the averagenitrification rates were 1049NH3-N(kgMLVSS。d)，1029NH3-N(kgMLVSSd)， 899NH3-N(kgMLVSSd)，869NH3-N(kgMLVSSd)respectively under the four different operating conditionsIn this
